带支板的冲压燃烧室的燃烧性能研究

应用含组分守恒方程的质量平均Navier-Stokes方程和B-L代数湍流模型,数值模拟了带支板引射器的模型燃烧室内部的流场结构,对比研究了燃料注入角度对燃烧及发动机性能的影响.在计算过程中,对方程中的对流项采用了空间为二阶精度的AUSMPW格式,对扩散项采用了二阶中心差分离散.研究结果表明,燃料有角度注入改善了燃料的混合性能,强化了燃料的燃烧效率,提高了发动机燃烧室的动量增量.此外,燃烧室的性能研究需考虑燃烧效率、总压损失及动量增量等因素.

Study to the combustion performance of a scramjet combustor with struts

In the present paper, the internal flow fields of scramjet combustion chamber with struts have been simulated numerically by using the Favre-Averaged Navier-Stokes equations with the Baldwin-Lomax algebraic turbulence model. In the computing to the flowfields in the combustor, the effects of the strut injector number and the fuel-injecting angle on the fuel/air mixing process are studied comparatively. During the simulations, the second order M. S. Liou's AUSMPW scheme is used for the inviscid flux terms and a central difference considering the character of flow direction is used for the diffusion terms. The results demonstrate that the fuel injecting with an angle can improve the fuel/air mixing performance, strengthen the combustion efficiency, and enhance the impulse increment of the combustor. The studies of the combustor performance need to consider some factors simultaneously such as combustion efficiency, total pressure recovery, and impulse increment.