Abstract
The objective of the present analysis is to investigate the effect of gaseous hydrocarbon fuels, such as Octane C8H18, Hexane C6H14, and Pentane C5H12 on the cyclic combustion process in an obstructed channel of the pulse detonation engine. Three-dimensional reactive Navier-Stokes equations are used to simulate the combustion mechanism of stoichiometric hydrocarbon fuels along with a one-step reaction model. The fuel is injected at atmospheric pressure and temperature and is ignited with pre-heated air. The investigation shows that initially a high-temperature combustion wave propagates with the local speed of sound; it creates turbulence after colliding with obstacles, resulting in an increase to supersonic flame speeds. Therefore, different values of the combustion flame propagation speed, combustion efficiency and impulse per unit area are obtained for these fuels. The detonation speed in the hexane-air mixture is about 5.8% lower than the detonation speed predicted by the NASA CEA400 code. However, it is observed that the octane fuel reduces the deflagration-to-detonation transition run-up distance as compared to other fuels.
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Original Russian Text © N. Alam, K.K. Sharma, K.M. Pandey.
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Alam, N., Sharma, K.K. & Pandey, K.M. Effects of Various Compositions of the Fuel—Air Mixture on the Pulse Detonation Engine Performance. Combust Explos Shock Waves 55, 708–717 (2019). https://doi.org/10.1134/S0010508219060121
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DOI: https://doi.org/10.1134/S0010508219060121