Mechanical Engineering, Earth and Planetary Sciences
11
Scopus Publications
49
Scholar Citations
4
Scholar h-index
2
Scholar i10-index
Scopus Publications
Direct numerical simulation of flame–wall interaction at Reτ=544 Shreshtha Kumar Gupta, Jen Zen Ho, Robert L. Gordon, Vaibhav Kumar Arghode, Mohsen Talei International Journal of Heat and Fluid Flow, 2026 A fully resolved direct numerical simulation is performed to examine flame–wall interactions at a friction Reynolds number of 544. The engine-relevant conditions are simulated, with a methane–air flame at 800 K, anchored in a channel, propagating two flame branches that interact with isothermal walls at 300 K and 800 K, respectively. This way, the flame near the 300 K wall interacts with a thermal boundary layer, whereas the flame near the 800 K wall interacts directly with the wall. This study first examines the statistics of the flame and flow key parameters, away from the walls and in the near-wall region. Then, several key parameters used in the geometric flame modelling framework are analysed. This includes flame displacement speed, curvature, and flame stretch. The study finds that near both walls, turbulence significantly influences the flame structure, resulting in fine-scale wrinkling and the formation of tongue-like structures in the near-wall region. The wall temperature strongly influences the flame dynamics, particularly the minimum flame–wall distance, which exhibits larger fluctuations for the 300 K wall. In the near-wall region, flame thickening is observed because of both turbulence and wall effects. The PDF of flame curvature broadens as the flame interacts with the wall, with negatively curved flame in the away-from-wall region and positively curved flame in the near-wall region. On average, the displacement speed shows a linear dependence on curvature, even in the near-wall region. The stretch rate is mainly influenced by the normal strain rate component for positive stretch and by the curvature component for negative stretch, irrespective of the flame location. These findings lay a foundation for simulating flame–wall interaction in the presence of intense turbulence with tools such as large-eddy simulation.
Characteristics of Premixed Flames of Hot and Diluted Mixtures Shreshtha Kumar Gupta, Vaibhav Kumar Arghode Combustion Science and Technology, 2024 Internal recirculation of product gases and mixing with fresh reactants, to form a hot and diluted combustible mixture, has been demonstrated to result in lower pollutant emissions. With sufficient amount of product gas recirculation, the mixture can reach above its auto-ignition temperature with low oxygen mass fractions (<4 wt%), resulting in distributed reactions instead of a flame. Some of the technologies with this feature are Moderate or Intense Low oxygen Dilution (MILD) combustion, FLameless OXidation (FLOX) and Colorless Distributed Combustion (CDC). However, if the amount of product gas recirculation is not enough and the auto ignition condition is not reached, premixed reactants of the hot and diluted mixture can be established. In this study, characteristics of such hot and diluted mixtures is studied which include the ignition delay time τign and the flame attributes such as laminar flame speed, SL and thermal flame thickness, δth. A perfectly stirred reactor (PSR) using the hot and diluted mixture as the inlet was further examined to simulate the main combustor and combustion efficiency η, and CO and NOx emissions were obtained. The investigations are performed at different product gas recirculation amounts ξ, equivalence ratios ϕ and operating pressures P, using chemical kinetic simulations. The thermo-chemical state of the recirculated product gases was obtained using a PSR with varying residence times (τ) to simulate different “burntness” levels (smaller τ simulates lower “burntness” level). The hot and diluted mixture temperature is higher, while oxygen and fuel mole fraction are lower for higher ξ, ϕ, P, and τ. Radical species’ mole fraction is higher for higher ξ, ϕ, and lower P, τ. Lower τign is observed for higher ξ, ϕ, P and smaller τ. Higher SL is observed for higher ξ, ϕ and lower P. Lower δth is observed for higher ξ, ϕ and P. SL and δth are found to be higher or lower with variation in τ, depending on ξ, ϕ and P, owing to variation in temperature and radicals’ concentration. Higher η is observed for higher ξ, P, lower ϕ, τ, and higher residence time of gases (τreac) inside the main combustor. Lower CO is observed with increase in ξ, P and decrease in τ, while exhaust NOx increases with ϕ and mostly remains unchanged with increase in ξ, while inconsistent trends are observed with change in P and τ.
Displacement speed characteristics during head-on quenching of premixed methane/air flames Shreshtha K. Gupta, Rahul Palulli, Mohsen Talei, Robert Gordon 22nd Australasian Fluid Mechanics Conference Afmc 2020, 2020 Head-On Quenching (HOQ) occurs when a flame propagates orthogonally towards a wall, and then extinguishes at a distance away from the wall. The flame displacement speed characteristics in a one-dimensional (1D) HOQ configuration are studied using direct numerical simulations (DNSs). A lean (ϕ = 0.7), premixed methane/air flame at 1 atm pressure with a premixture temperature of 300K propagating towards an inert, isothermal wall is simulated. A 53-species, 325-reactions detailed chemical mechanism, GRI 3.0, is used. The flame displacement speed characteristics over the full range of progress variable values (0 to 1) is analysed for two definitions of progress variables. The progress variable definitions are based on the O2 and CO2 mass fractions. The flame displacement speed characteristics during quenching are found to be qualitatively different for different values of progress variable. For small values of progress variable, displacement speed increases monotonically during quenching while an initial decrease in the displacement speed is observed for intermediate values of progress variable, followed by a monotonic increase. Such differences are further investigated by examining the contributions of the diffusion and reaction components of the flame displacement speed. The distance of the progress variable isolines from the wall are found to affect the flame displacement speed characteristics.
Direct numerical simulation of flame–wall interaction at Reτ= 544 SK Gupta, JZ Ho, RL Gordon, VK Arghode, M Talei International Journal of Heat and Fluid Flow 121, 110470 , 2026 2026
Effects of Heat and Gas Recirculation on Premixed Flames A Shinde, SK Gupta, VK Arghode 28th National and 6th International ISHMT-ASTFE Heat and Mass Transfer … , 2025 2025
Characteristics of Premixed Flames of Hot and Diluted Mixtures SK Gupta, VK Arghode Combustion Science and Technology 196 (14), 2255-2276 , 2024 2024 Citations: 2
Investigation of Low Emission Reverse Flow Combustors A Lakhiwal, S Gupta, K Nishad, V Arghode Conference on Fluid Mechanics and Fluid Power, 579-591 , 2023 2023
Investigation of a low emission peripheral vortex reverse flow (PVRF) combustor fuelled by LPG and ethylene K Ahmad, SK Gupta, VK Arghode Journal of the Energy Institute 108, 101200 , 2023 2023 Citations: 3
Flame-Wall Interaction in the Presence of Intense Turbulence SK Gupta The University of Melbourne, PhD thesis , 2023 2023
Analysis of the filtered flame-front displacement term for an intensely turbulent premixed flame experiencing flame-wall interaction SK Gupta, P Panek, M Talei, R Gordon, VK Arghode 23rd Australasian Fluid Mechanics Conference , 2022 2022
Combustion characteristics of a reverse-cross-flow combustor SK Gupta, S Pramanik, RL Gordon, RV Ravikrishna, VK Arghode Journal of the Energy Institute 103, 1-16 , 2022 2022 Citations: 5
CO modelling of premixed head-on quenching flame in the context of Large-Eddy Simulation SK Gupta, R Palulli, M Talei, RL Gordon, VK Arghode International Journal of Heat and Fluid Flow 93, 108895 , 2022 2022 Citations: 5
Chemical Kinetic Investigation of Premixed Flames with Product Gas Recirculation S Choudhury, SK Gupta, VK Arghode National Conference on Turbomachines, Energy and Combustion (NCTEC 2021) , 2021 2021
Displacement speed characteristics during head-on quenching of premixed methane/air flames SK Gupta, R Palulli, M Talei, R Gordon 22nd Australasian Fluid Mechanics Conference , 2020 2020 Citations: 1
Investigation of peripheral vortex reverse flow (PVRF) combustor for gas turbine engines SK Gupta, AK Kushwaha, VK Arghode Energy 193, 116766 , 2020 2020 Citations: 16
Investigation of a reverse-cross flow combustor with varying fuel injection momentum SK Gupta, VK Arghode Thermal Science and Engineering Progress 10, 232-244 , 2019 2019 Citations: 13
Reaction Zone Characterization of a Low Emission Reverse-Cross Flow Combustor SK Gupta, S Pramanik, V Arghode, RV Ravikrishna AIAA Propulsion and Energy 2019 Forum, 4369 , 2019 2019
Investigation of a reverse cross flow combustor SK Gupta, VK Arghode Proceedings of the 7th International and 45th National conference on Fluid … , 2018 2018
Influence of fuel jet momentum on characteristics of a reverse-cross flow combustor SK Gupta, V Arghode Gas Turbine India Conference 58509, V001T04A002 , 2017 2017 Citations: 4
Investigation of a Low Emission Reverse Cross Flow Colorless Combustor SK Gupta Master thesis , 2017 2017
MOST CITED SCHOLAR PUBLICATIONS
Investigation of peripheral vortex reverse flow (PVRF) combustor for gas turbine engines SK Gupta, AK Kushwaha, VK Arghode Energy 193, 116766 , 2020 2020 Citations: 16
Investigation of a reverse-cross flow combustor with varying fuel injection momentum SK Gupta, VK Arghode Thermal Science and Engineering Progress 10, 232-244 , 2019 2019 Citations: 13
Combustion characteristics of a reverse-cross-flow combustor SK Gupta, S Pramanik, RL Gordon, RV Ravikrishna, VK Arghode Journal of the Energy Institute 103, 1-16 , 2022 2022 Citations: 5
CO modelling of premixed head-on quenching flame in the context of Large-Eddy Simulation SK Gupta, R Palulli, M Talei, RL Gordon, VK Arghode International Journal of Heat and Fluid Flow 93, 108895 , 2022 2022 Citations: 5
Influence of fuel jet momentum on characteristics of a reverse-cross flow combustor SK Gupta, V Arghode Gas Turbine India Conference 58509, V001T04A002 , 2017 2017 Citations: 4
Investigation of a low emission peripheral vortex reverse flow (PVRF) combustor fuelled by LPG and ethylene K Ahmad, SK Gupta, VK Arghode Journal of the Energy Institute 108, 101200 , 2023 2023 Citations: 3
Characteristics of Premixed Flames of Hot and Diluted Mixtures SK Gupta, VK Arghode Combustion Science and Technology 196 (14), 2255-2276 , 2024 2024 Citations: 2
Displacement speed characteristics during head-on quenching of premixed methane/air flames SK Gupta, R Palulli, M Talei, R Gordon 22nd Australasian Fluid Mechanics Conference , 2020 2020 Citations: 1
Direct numerical simulation of flame–wall interaction at Reτ= 544 SK Gupta, JZ Ho, RL Gordon, VK Arghode, M Talei International Journal of Heat and Fluid Flow 121, 110470 , 2026 2026
Effects of Heat and Gas Recirculation on Premixed Flames A Shinde, SK Gupta, VK Arghode 28th National and 6th International ISHMT-ASTFE Heat and Mass Transfer … , 2025 2025
Investigation of Low Emission Reverse Flow Combustors A Lakhiwal, S Gupta, K Nishad, V Arghode Conference on Fluid Mechanics and Fluid Power, 579-591 , 2023 2023
Flame-Wall Interaction in the Presence of Intense Turbulence SK Gupta The University of Melbourne, PhD thesis , 2023 2023
Analysis of the filtered flame-front displacement term for an intensely turbulent premixed flame experiencing flame-wall interaction SK Gupta, P Panek, M Talei, R Gordon, VK Arghode 23rd Australasian Fluid Mechanics Conference , 2022 2022
Chemical Kinetic Investigation of Premixed Flames with Product Gas Recirculation S Choudhury, SK Gupta, VK Arghode National Conference on Turbomachines, Energy and Combustion (NCTEC 2021) , 2021 2021
Reaction Zone Characterization of a Low Emission Reverse-Cross Flow Combustor SK Gupta, S Pramanik, V Arghode, RV Ravikrishna AIAA Propulsion and Energy 2019 Forum, 4369 , 2019 2019
Investigation of a reverse cross flow combustor SK Gupta, VK Arghode Proceedings of the 7th International and 45th National conference on Fluid … , 2018 2018
Investigation of a Low Emission Reverse Cross Flow Colorless Combustor SK Gupta Master thesis , 2017 2017
