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Turbulent premixed combustion
Turbulent premixed combustion is the primary operating mode in various combustion systems, including land-based gas turbine engines. Owing to its high combustion efficiency and relatively low emissions, it also holds significant potential for broader application in aircraft propulsion. Over the past several years, we have conducted extensive investigations of these flames, with a primary focus on flame structure and burning velocity, which are key parameters in the design and optimization of current and next-generation gas turbine engines.
In the figure below, adapted from Mohammadnejad et al. (Combustion and Flame, 2020), we illustrate how eddies can penetrate into the flame structure.
The following is a list of our publications related to this subject.
Mohammadnejad, S., and Kheirkhah, S. (2025) “Spectral characteristic of a scalar-dissipation-rate-based turbulent burning velocity”, Physical Review Fluids, 10 (2), 023201.
Mohammadnejad, S., and Kheirkhah, S. (2024) “Effects of combustion progress variable and Karlovitz number on the scalar dissipation rate of turbulent premixed hydrogen-enriched methane–air flames: An experimental study”, Combustion and Flame, 269, 113669.
Mohammadnejad, S., An, Q., Vena, P., Yun, S., and Kheirkhah, S. (2021) “Contributions of flame thickening and extinctions to a heat release rate marker of intensely turbulent premixed hydrogen-enriched methane-air flames”, Combustion and Flame, 231, 111481.
Mohammadnejad, S., An, Q., Vena, P., Yun, S., and Kheirkhah, S. (2020) “Thick reaction zones in non-flamelet turbulent premixed combustion”, Combustion and Flame, 222, 285-304.
Mohammadnejad, S., Vena, P., Yun, S., and Kheirkhah, S. (2019) “Internal structure of hydrogen-enriched methane–air turbulent premixed flames: Flamelet and non-flamelet behavior”, Combustion and Flame, 208, 139-157.
Turbulent spray combustion
Turbulent spray combustion, predominantly in non-premixed or partially premixed modes, is the primary combustion regime in aviation gas turbine engines. Due to the importance of this regime, we have recently focused our research on these flames. In the figure below, adapted from Krebbers et al. (Combustion and Flame, 2023), we have examined the relation between flame chemiluminescence and spray number density.
Here is a list of our publications related to this subject.
Mohammadnejad, S., Azimi, A., Maurya, R., and Gülder, Ö. L. (2025) “Influence of hydrogen enrichment on spray combustion of Jet A-1 in a swirl-stabilized model gas turbine combustor”, [Submitted to Combustion and Flame].
Rostami, A., Mohammadnejad, S., Li, R., and Kheirkhah, S. (2024) “Astigmatic interferometric particle imaging of reacting Jet A-1 sprays: Joint droplet and cluster characteristics”, Proceedings of the Combustion Institute, 40 (1-4), 105600.
Krebbers, L., Mohammadnejad, S., Rostami, A., and Kheirkhah, S. (2023) “Relations between the number of spray droplets and chemiluminescence for Jet A-1 flames stabilized in a gas turbine model combustor”, Combustion and Flame, 257, 113016.
Internal combustion engines
Internal combustion engines play a pivotal role in both transportation and industry. We have investigated these engines both experimentally and numerically. Specifically, the effects of swirl ratio and fuel injection angle in reactivity-controlled compression ignition engines were examined in Mohammadnejad et al. (Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2019). The figures on the right are adapted from that study.
Below is a list of our publications related to this subject.
Mohammadnejad, S., Amani, E., Hosseini, R., Chitsaz, I., and Kamali, A. (2019) “Effects of the swirl ratio and spray angle on the mixture stratification in a diesel–NG RCCI engine”, Journal of the Brazilian Society of Mechanical Sciences and Engineering, 41 (5), 233.
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