Proceedings of the
International Conference on Mechanical Engineering 2009
(ICME2009) 26- 28 December 2009, Dhaka, Bangladesh

ICME09-FM-29

MIXING OF SUPERSONIC JETS WITH DIFFERENT MERGING
ANGLES FOR CONSTANT INLET PRESSURE AND VELOCITY

Mohammad Ali, M. Quamrul Islam, TAGN Jubery and S. M. Nazrul Islam
Department of Mechanical Engineering, BUET, Dhaka, Bangladesh

ABSTRACT

In present investigation mixing of two supersonic non parallel gaseous streams has been simulated numerically. The streams are of air and hydrogen, which come into contact after passing over a finite thickness base. The gases are considered to be fed from a high-pressure reservoir. Two-dimensional unsteady state Navier-Stokes equations, energy, mass diffusion and species continuity equations are numerically simulated to analyze two-dimensional shear layers in supersonic flow field. An explicit Harten-Yee Non-MUSCL Modified flux-type TVD (total variation diminishing) scheme has been used to solve the system of equations. An algebraic turbulence model was used to calculate the eddy viscosity coefficient. Keeping constant the inlet pressure and velocity of the streams, the merging angle is varied to observe the physics of the mixing flow fields, mixing of shear layers and mixing efficiency. The result shows that when merging angle increases interaction between two streams increases and high momentum exchange occurs and eventually high mixing occurs for the pressure ratios considered here.
 

Keywords: Supersonic Combustor, Mixing, Shear Layers, Merging Angle

Click Here to download full report.