Influence of jet rotational angle on combustion efficiency of solid ducted motor (SDM)

We improve the combustion efficiency of SDM by selecting a good jet rotational angle. The combustion efficiency can be increased from 10% to 20%. The physical model and the theoretical method are described. The Reynolds-averaged Navier-Stokes governing equations, RNG (Renormalization Group Method) κ-ε turbulence model and finite rate chemical mechanism are utilized. Then simulation ways of three-dimensional mixing, chemical reaction and flow field with upwind-difference are studied. The numerical simulation results are given. The combustion efficiencies of 8 different rotational angles (typical ones out of over 80 different rotational angles) are discussed. Each rotational angle is denoted by the angles made with x,y, and z axes respectively. When θ=θ₄=(10°, 80°, 90°), the combustion efficiency can be increased from 10% to 20%.