Abstract— In the design of a jet engine the problem of fuel injection as well as flame holding is very important role. In combustion due to short residence times, it is essential to specifically adopt a device or strategy to enhance the mixing between the fuel and oxidizer to achieve combustors of reasonable size and weight. At the same time the mixing device/strategy should not lead to large total pressure losses for the flow in the combustor, because it would leads to thrust losses. Compared to other mixing devices cavity has low pressure losses and high combustion efficiency. It is essential to understand the behavior of cavity. Computational Fluid Dynamics (CFD) investigations are carried out by varying geometric parameters to study the cavity influence on the combustion at subsonic speed, in a simple combustor with cavity and without cavity. The different fuels like hydrogen, kerosene and high octane are injected at Mach number 0.8 to Mach number 0.3 air stream. The combustion efficiency determined different above mentioned fuels that hydrogen is greater than two fuels. Also in hydrogen fuel there is 20.05% increase in combustion efficiency of geometric combustor with cavity compared to without cavity. The present study indicates that combustion efficiency is high in the presence of cavity at subsonic flows. This work was carried by using computational software package fluent and gambit.

Index Terms— CFD, Cavity, Combustor, Combustion efficiency

Cite: Chandra Shekhar and M Shiva Shankar, " CFD Analysis of Different Geometric Combustor at Subsonic Flow," International Journal of Mechanical Engineering and Robotics Research, Vol.1, No. 2, pp. 59-66, July 2012.