Doctor of Engineering Sciences in the specialty “Engines and Power Plants” (2025) on the topic “Method for experimental assessment of damage to internal combustion engines of vehicles”. Expert of the highest qualification, specialty “Aircraft engines” (Moscow Aviation Institute, faculty “Aircraft engines”, 1979), PhD was by specialty “Thermal Engines” (1985), Senior Researcher (1990), author of the books “Repair of engines of foreign cars” (1998), “Technical condition expertise and fault causes of automotive technology” (2019), monograph “Methods for modeling damage in internal combustion engines of vehicles” (2024) and more than 180 articles on motor topics, including 55 scientific papers and 5 patents in design of aircraft and automobile engines.
Total work experience by the specialty (theory, design, operation and repair of internal combustion engines) — since 1979, expert — since 2003.
EDUCATION
Moscow aviation institute, Aircraft engines faculty (1979)
PhD (1985)
Senior Researcher (1990)
Doctor of Engineering Sciences (2025)
Mathematical model and computer program development for online modeling of pulse jet engine working cycle, parameters, and characteristics Alexander Khrulev, Valeriy Muntyan Drone Systems and Applications, 2026 The work is devoted to the development of a mathematical model and a program for online modeling of the pulse jet engine working cycle and characteristics to assess the possibility of its use on unmanned aerial vehicles. The developed universal thermodynamic model describes the instantaneous change in pressure and temperature, taking into account the mixing of flows, combustion, and heat exchange in the combustion chamber of valved and valveless types of pulse jet engines, as well as the flows through the pipes and reed valves of various designs. Unlike the known works, a special online program, Pulsejet-Sim, for pulsejet modeling by a wide range of users has been developed for the first time, which is posted on a special website as a web-oriented software service that does not require downloading to the user’s computer and allows for instant calculation using server resources and secure data cloud storage. Using the developed software, preliminary mathematical modeling of known samples of pulse jet engines was performed, which showed generally satisfactory qualitative and quantitative agreement of the modeling results (error less than 10%) with the available experimental data on thrust, specific fuel consumption, cycle frequency, and other parameters.
TECHNICAL CONDITION ASSESSMENT AND MODELLING OF REED VALVES IN VEHICLE ENGINE INTAKE SYSTEMS Oleksandr Kravchenko, Alexander Khrulev, Juraj Gerlici, Oleksii Saraiev, Serhii Danets Communications Scientific Letters of the University of Zilina, 2025 The purpose of the study was to evaluate the effectiveness of using a simple reed valve model of an engine with periodic workflow. To achieve this purpose, models of the reed valve have been developed and determined that the quasi-stationary model allows one to find the air flow through the reed valve with an accuracy of 5-6%. The limits of permissible values, at which the model has a minimal error, correspond to Strouhal number of 0.2-0.3. This data confirmed that with proper consideration of the existing limitations, the quasi-stationary model gives results close to those provided by the complex dynamic models.
Modeling of thermodynamic processes in internal combustion engine cylinder during cranking in compression measurement tests Alexander Eduard Khrulev, Oleksii Victorovich Saraiev, Iryna Yuryevna Saraieva, Oleksandr Mykolayovych Vorobiov Combustion Engines, 2024 The thermodynamics of in-cylinder processes of the internal combustion engine in cranking mode when measuring compression were examined. Analysis of various theoretical models and comparison of known data showed that the problems of constructing mathematical models of the engine operating cycle remain unresolved. The vast majority of practical data and recommendations for measuring cylinder compression are based on empirical knowledge, numerous experiments and tests. In accordance with this, there is a need for computational models of the compression measurement process and their theoretical justification. To solve the identified problems, a mathematical model of the thermodynamic processes in the cylinder was developed. Unlike existing ones, the model describes the processes in the cylinder step by step, taking into account the real nature of the intake-exhaust processes, air leakage through the interfaces of parts and heat exchange with the walls. Using modeling, the main patterns of changes in compression depending on the modes, the nature of damage to the associated parts of the valve mechanism and cylinder-piston group, the amount of leakage and engine temperature were found. Based on the results of the study, the properties of the model which make its use effective in diagnosing and monitoring the technical condition of engines in operation were concluded.
DETERMINATION OF GAS PARAMETERS IN RESONANT PIPES AND CHANNELS OF ENGINES WITH A PERIODIC WORKFLOW USING THE PISTON ANALOGY METHOD Alexander Khrulev Eastern European Journal of Enterprise Technologies, 2023 This paper investigates a process of gas flow in the resonant tube of an engine with a periodic workflow. Analysis of various flow models and comparison of known data have shown that the problems of constructing closed 0-dimensional models of the operating cycle for some types of engines remain unresolved. Given this, the question arises about the dimensionality of models of individual engine elements, including the resonant pipe model, which must be included in the general model of the cycle, especially at the initial stage of its development. To solve the identified problems, a mathematical model of air flow has been improved, built on the basis of an analogy with a '"liquid" piston. Unlike existing ones, the piston analogy model allows one to calculate the instantaneous velocity averaged over the length of the pipe using a numerical solution of the differential equation for velocity. To test the model built, an alternative finite-difference 1-dimensional gas-dynamic model was selected, with the help of which a test simulation of air flow in a pipe was performed. It has been established that the piston model allows one to find the flow velocity with an accuracy of 5 % for a pressure drop varying according to a sinusoidal law. The permissible limits for changes in the oscillation frequency and pipe length were found, at which the piston model has a minimum error. Based on the results of the study, it was concluded that with a small mass and inertia of the liquid piston, the proposed model gives results close to those provided by more complex models with higher dimensionality. This indicates the possibility of using a piston model for elements such as pipes as part of a 0-dimensional thermodynamic model of engines with a periodic operating process as an approximate alternative to traditional 1-dimensional flow models
BUILDING A MATHEMATICAL MODEL OF THE DESTRUCTION OF A CONNECTING ROD-PISTON GROUP IN THE CAR ENGINE AT HYDRAULIC LOCK Alexander Khrulev, Oleksii Saraiev Eastern European Journal of Enterprise Technologies, 2022 This paper investigates the process of destruction of parts of the connecting rod-piston group of the engine due to hydraulic lock after the ingress of liquid into the cylinders of the engine. Comparing expert data on actual engine destruction due to hydrolock with existing estimation models has made it possible to identify a number of significant contradictions affecting the objectivity and accuracy of the destruction assessment. To resolve the existing contradictions, a mathematical model for reconstructing the destruction of the connecting rod-piston group of the engine during a hydraulic lock has been improved. Unlike the existing ones, the model makes it possible to take into consideration not only the static deformation of the connecting rod but also to give a comprehensive assessment of the deformations of the connecting rod, piston pin, and piston at different volumes of hydrolock fluid. Underlying the model is the hypothesis assuming that the deformation of the piston pin under excessive load caused by hydraulic lock leads to the emergence of tension and an increase in the friction in the mated pin-piston. The calculation from the condition of differential change in the amount of friction in the mated pin-piston produced a satisfactory result that does not contradict the practical data and has confirmed the working hypothesis. By calculation, the onset of the destruction of engine parts during hydrolock at a pressure in the cylinder close to 17.3 MPa, at a crankshaft angle of about 346°, was revealed. In addition, it was found that in the case of violating the operating conditions, due to friction, the mated pin-piston is exposed to the lateral force on the skirt that reaches 17.2 MPa, which exceeds the permissible one, calculated according to known procedures, by 2.8 times. The results reported here are confirmed by known practical data, which makes the devised model applicable to the practice of expert studies into the causes of engine malfunctions when violating the operating conditions of a car
Acoustic method for estimation of marine low-speed engine turbocharger parameters Roman Varbanets, Oleksij Fomin, Václav Píštěk, Valentyn Klymenko, Dmytro Minchev, Alexander Khrulev, Vitalii Zalozh, Pavel Kučera Journal of Marine Science and Engineering, 2021 The article presents the acoustic method of marine low-speed engine turbocharger parameter estimation under operating conditions when a prompt assessment of instantaneous turbocharger speed and rotor vibration level is required. The method lies in the analysis of the acoustic signal that is generated by the compressor of the turbocharger with the diesel engine running under load. The spectral analysis reveals that the compressor blades generate acoustic oscillations that are always present in the overall acoustic spectrum of the turbocharger regardless of its technical condition. The harmonic components corresponding to the blades can be detected in the spectrum using the limit method. The calculated instantaneous turbocharger speed makes it possible to analyze the main harmonic amplitude in the spectrum. The method presented in this paper helps eliminate discrete Fourier transform (DFT) spectral leakage so that the amplitude of the main harmonic can be estimated. Further analysis of the amplitude of the main harmonic allows for efficient estimation of the turbocharger rotor vibration level when in operation. The method can be practically applied by means of a smartphone or a computer that has the dedicated software installed. The proposed method lays the foundations for a permanent monitoring system of turbocharger speed and vibration in industrial and marine diesel engines.
Devising a model of the airflow with dust particles in the intake system of a vehicle’s internal combustion engine Olexii Saraiev, Alexander Khrulev Eastern European Journal of Enterprise Technologies, 2021 This paper considers the mechanism of malfunction of internal combustion engines that implies the accelerated local wear of parts in individual cylinders as a result of uneven distribution of dust particles that pass through the air filter in the intake system. In order to acquire quantitative data on the effect of the structure of the intake system on the redistribution of dust in engine cylinders, the two-phase flow of air with dust particles in the standard elements of the intake system was mathematically modeled. ANSYS software package was used to solve the problem. A simulation technique was devised in which the airflow was first calculated to determine the boundary conditions for dust, after which the flow of air with particles was calculated. The calculations were carried out in a range of air velocities of 5‒20 m/s in branching channels with diversion angles of 45°, 90°, and 135° for the most characteristic particle sizes of 5‒30 µm. It has been estimated that dust particles deviate from the air streamlines by inertia and can slip through the lateral drain the stronger the larger particle size, diversion angle, and velocity of air. The comparison of the simulation results with experimental data confirmed that in the intake system of some engines, due to uneven particle distribution, there is local abrasive wear in one or more cylinders, which can significantly reduce the resource. This paper shows the need to take into consideration the centrifugation and redistribution of dust in the intake systems during the design, modernization, expert studies to determine the causes of faults associated with faulty operating conditions, as well as to clarify the regulations for the maintenance of existing engines.
Study of the conrod deformation during piston interaction with liquid in the internal combustion engine cylinder Sergey Alekseevich Dmitriev, Alexander Eduardovich Khrulev Journal of Mechanical Engineering and Sciences, 2020 The paper analyzes the deformation of the connecting rod stem with buckling due to water ingress into the internal combustion engine cylinder (the so-called hydrolock). A method is presented that has been developed to perform calculations of stem deformation in the process of compressing air with liquid in an internal combustion engine cylinder. The method is based on solving a system of differential equations for pressure and temperature in the cylinder, followed by calculating the compression force acting on the connecting rod. A carried-out simulation of the compression process demonstrates the dependence of the air pressure in the cylinder, the stress and the strain of the connecting rod on the fill ratio of the combustion chamber with liquid. The calculations performed according to the classical theory of resistance of materials have shown that the connecting rod with the buckling of the stem begins to deform when the liquid fills the combustion chamber to a minimum of 80%. With the increase in the amount of liquid, the deformation of the conrod increases, and when the level of liquid filling is so significant that it exceeds the volume of the combustion chamber, the conrod stem deformation reaches extreme values. It is shown that under these conditions after the hydrolock occurs the engine may fail due to the piston wedging the crankshaft in the bottom dead center position.
Thermal Damage of Intake Valves in ICE with Variable Timing S. A. Dmitriev, A. E. Khrulev International Journal of Automotive and Mechanical Engineering, 2019 The article provides the study on causes of damage to ICE intake valves, in the course of which the intake valve heads have been overheated and deformed as a result of material creep. On the example of the failure detected in the analysed engine, it has been established that the traditionally known reasons such as the combustion process failure cannot cause the damage described. For the purpose of determining the real causes of damage to the intake valves the authors simulated the thermal state of the intake valve in the heatingcooling conditions with the impact of gas in the cylinder and the impact of air in the intake pipe as well as the contact heat exchange with the seat with regard to thermal conductivity along the stem. The calculations have shown that with the increase of rotation frequency the failure of the control system that causes the engine to run at high rotation frequencies with a small intake valve lift leads to the temperature increase higher than it is recommended for the materials used, which causes the described overheating. Based on the conducted research the authors have developed recommendations for improving the reliability of the intake valves performance in the ICEs with variable valve timing.
RECENT SCHOLAR PUBLICATIONS
Mathematical model and computer program development for online modeling of pulse jet engine working cycle, parameters, and characteristics A Khrulev, V Muntyan Drone Systems and Applications 14, 1-32 , 2026 2026
Technical condition assessment and modelling of reed valves in vehicle engine intake systems O Kravchenko, A Khrulev, J Gerlici, O Saraiev, S Danets Communications-Scientific Letters of the University of Zilina 27 (1), B41-B52 , 2025 2025 Citations: 3
MODELING OF LOCAL DAMAGE IN AUTOMOBILE INTERNAL COMBUSTION ENGINES O Kravchenko, A Khrulev, J Gerlici, O Saraіev 2025
Експертні дослідження пошкоджень двигуна внутрішнього згоряння автомобіля через моделі теплообміну ОЕ Хрулєв, СІ Кривошапов, ОВ Козлов, ДВ Леонтьєв ФОП Бровін ОВ , 2025 2025
Моделювання напружено-деформованого стану деталей двигуна при проведенні автотехнічної експертизи ОЕ Хрулєв, ІЮ Сараєва, ВК Дібров, АА Сохін ФОП Бровін ОВ , 2025 2025
Modeling work-flow of the “cylinder-piston” type devices using a universal thermodinamic model A Khrulev Evolutions Mech Eng. EME 618 , 2024 2024 Citations: 2
Моделювання діагностичних параметрів циліндро-поршневої групи автомобільного двигуна після гідроудару ОЕ Хрулєв, ІЮ Сараєва, МЮ Суханов, ОМ Воробйов Харківський національний автомобільно-дорожній універститет , 2024 2024
Modeling of thermodynamic processes in internal combustion engine cylinder during cranking in compression measurement tests AE Khrulev, OV Saraiev, ІY Saraieva, OM Vorobiov Combustion Engines 63 (3), 98-109 , 2024 2024 Citations: 7
Можливості термодинамічного моделювання для дослідження процесів у конструкціях типу «циліндр-поршень» ОЕ Хрулєв V Міжнародної науково-практичної морської конференції кафедри СЕУ І ТЕ … , 2024 2024
Метод експертної оцінки технічного стану циліндро-поршневої групи автомобільного двигуна після гідроудару ОЕ Хрулєв, ОВ Сараєв, ІЮ Сараєва Харківський національний автомобільно-дорожній університет , 2024 2024
LOGICAL METHOD FOR DETERMINING THE FAILURES DUE TO ENGINE OIL DEGRADATION, IN TASKS OF EXPERTISE OF AUTOMOTIVE ENGINE TECHNICAL CONDITION A Khrulev Матеріали Міжнародної мультидисциплінарної наукової інтернет-конференції … , 2023 2023
Modeling of local damage to bearings due to engine lubrication system failure A Khrulev Modern research in science and education. Proceedings of the 3rd … , 2023 2023
Modeling of damage to conrod-piston group during hydrolock in internal combustion engine cylinder A Khrulev Modern problems of science, education and society. Proceedings of the 9th … , 2023 2023
Local wear mechanism in the modern car engines due to dust centrifugation in inlet system A Khrulev Current challenges of science and education. Proceedings of the 3rd … , 2023 2023
Principles of development and practical application of logical methods in tasks of searching for the failure causes in internal combustion engines A Khrulev Proceedings of the 9th International scientific and practical conference … , 2023 2023 Citations: 3
Modeling of emergency operation mode of car engine due to coolant leak A Khrulev Proceedings of II International Scientific and Practical Conference … , 2023 2023
Mathematical modeling of reed valve operation in engines with periodic workflow A Khrulev Proceeding of the 11th International scientific and practical conference … , 2023 2023 Citations: 2
Wear mechanism in modern internal combustion engines due to dust centrifugation in intake system A Khrulev World of scientific research, 348-353 , 2023 2023
Simulation of thermal damage to intake valves in automotive engines with valve timing control A Khrulev Материали VІI Міжнародної науково-практичної конференції «Інтеграція … , 2023 2023
Modeling of engine with periodic workflow using dimensionless similarity criteria and piston analogy method A Khrulev Світ наукових досліджень. Випуск 23: матеріали Міжнародної … , 2023 2023
MOST CITED SCHOLAR PUBLICATIONS
Ремонт двигателей зарубежных автомобилей АЭ Хрулев М.: Изд-во" За рулем, 480 , 1998 1998 Citations: 133
Acoustic method for estimation of marine low-speed engine turbocharger parameters R Varbanets, O Fomin, V Píštěk, V Klymenko, D Minchev, A Khrulev, ... Journal of Marine Science and Engineering 9 (3), 321 , 2021 2021 Citations: 96
Экспертиза технического состояния и причины неисправностей автомобильной техники АЭ Хрулев, ВБ Дроздовский, СК Лосавио М.: Издательство АБС , 2019 2019 Citations: 15
Study of the conrod deformation during piston interaction with liquid in the internal combustion engine cylinder SA Dmitriev, AE Khrulev Journal of Mechanical Engineering and Sciences 14 (2), 6557-6569 , 2020 2020 Citations: 14
Методика определения причины неисправности ДВС при тяжелых эксплуатационных повреждениях АЭ Хрулев, ЮВ Кочуренко Двигатели внутреннего сгорания 1 (DOI: 10.20998/0419-8719.2017.1.10), 52-60 , 2017 2017 Citations: 14
Влияние неисправностей в системе смазки на характер повреждения подшипников ДВС АЭ Хрулев, МВ Кротов Двигатели внутреннего сгорания 1 (DOI: 10.20998/0419-8719.2018.1.13), 74-81 , 2018 2018 Citations: 13
The method of expert assessment of the technical condition of an automobile engine after overheating AE Khrulev, OV Saraiev Харківський національний автомобільно-дорожній університет , 2021 2021 Citations: 12
Экспертиза технического состояния и причины неисправностей автомобильной техники ВБ Дроздовский, СК Лосавио, АЭ Хрулев ВБ Дроздовский, СК Лосавио, АЭ Хрулев–Москва: Издательство АБС , 2019 2019 Citations: 12
Применение инженерных методов при экспертном исследовании и определении причины перегрева ДВС АЭ Хрулев Двигатели внутреннего сгорания 1, 86-95 , 2015 2015 Citations: 12
Building a mathematical model of the destruction of a connecting rod-piston group in the car engine at hydraulic lock. A Khrulev, O Saraiev Eastern-European Journal of Enterprise Technologies 117 (7) , 2022 2022 Citations: 11
Analysis of pneumatic catapult launch system parameters, taking into account engine and UAV characteristics A Khrulev Advanced UAV 3 (1), 10-24 , 2023 2023 Citations: 9
Современные поршни АЭ Хрулев Автомобиль и сервис 11, 21-24 , 2007 2007 Citations: 9
Local Abrasive Wear in Automobile Internal Combustion Engines A Khrulev, O Saraiev LAP LAMBERT Academic Publishing , 2021 2021 Citations: 8
Modeling of thermodynamic processes in internal combustion engine cylinder during cranking in compression measurement tests AE Khrulev, OV Saraiev, ІY Saraieva, OM Vorobiov Combustion Engines 63 (3), 98-109 , 2024 2024 Citations: 7
Разработка модели течения воздуха с частицами пыли во впускной системе двигателя внутреннего сгорания дорожного транспортного средства АВ Сараев, АЭ Хрулев Eastern-European Journal of Enterprise Technologies, 2 (1 (110)), 61–69 , 2021 2021 Citations: 7
Почему застучал вкладыш? АЭ Хрулев Автомобиль и сервис 12, 14-16 , 2000 2000 Citations: 7
Determination of gas parameters in resonant pipes and channels of engines with a periodic workflow using the piston analogy method. A Khrulev Eastern-European Journal of Enterprise Technologies 125 (7) , 2023 2023 Citations: 6
Some Aspects of Influence of the Connecting Rod Design on the Output Parameters of High-Speed Internal Combustion Engines SA Dmitriev, AE Khrulev Scientific-Technical Journal "Problems of Friction and Wear" 1 (86), 23-37 , 2020 2020 Citations: 5
Thermal Damage of Intake Valves in ICE with Variable Timing SA Dmitriev, AE Khrulev International Journal of Automotive and Mechanical Engineering 16 (4), 7243-7258 , 2019 2019 Citations: 5
Гарантийный возраст дожития АЭ Хрулев, ЮИ Буцкий Автомобиль и сервис, 46-50 , 2017 2017 Citations: 5
