Paper Information

Journal:   INTERNATIONAL JOURNAL OF ENGINEERING   FEBRUARY 2004 , Volume 17 , Number 1 (TRANSACTIONS A: BASICS); Page(s) 85 To 98.
 
Paper: 

A NUMERICAL STUDY ON MIXING OF TRANSVERSE INJECTION IN SUPERSONIC COMBUSTOR

 
 
Author(s):  ALI M., AHMED S., SADR ALESLAM A.K.M.
 
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Abstract: 
A numerical study on mixing of hydrogen injected transversely into a supersonic air ‎stream has been performed be solving Two-Dimensional full Navier-Stokes ‎equations. An explicit Harten-Yee Non-MUSCL Modified-flux-type TVD scheme has ‎been used to solve the system of equations, and a zero-equation algebraic turbulence ‎model to calculate the eddy viscosity coefficient. The main objectives of this study are ‎to increase the mixing and combustion efficiencies, and the flame holding capability ‎of a supersonic combustor. The performance of combustor has been investigated by ‎varying the distance of injector position from left boundary keeping constant the ‎backward-facing step height and other calculation parameters. The results show that ‎the configuration for small distance of injector position has high mixing efficiency but ‎the upstream recirculation cannot be evolved properly, which is an important factor ‎for flame holding capability. On the other hand the configuration for very long ‎distance has lower mixing efficiency due to lower gradient of hydrogen mass ‎concentration on the top of injector caused by the expansion of side jet in both ‎upstream and injector. For moderate distance of injector position, large and elongated ‎upstream recirculation can evolve which might be activated as a good flame holder‏.‏
 
Keyword(s): SCRAMJET ENGINE, TVD SCHEME, BACKWARD-FACING STEP, MIXING, SUPERSONIC STREAM, FLAME HOLDING
 
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