气冷喷油杆隔热套高度对混合扩压器性能影响

针对一种带气冷喷油杆的混合扩压器,基于Navier-Stokes方程组建立了流场三维数值计算模型,研究了气冷喷油杆的隔热套高度对一体化混合扩压器流场、流阻特性和混合特性的气动热力性能影响规律。结果表明:隔热套高度对混合扩压器热混合效率影响不大,总体变化范围小于0.008;随着隔热套高度的增加,静压恢复系数逐渐减小,流阻系数和压力损失系数逐渐增大;在混合扩压器出口截面处,总压恢复系数随隔热套高度增加而逐渐减小,且总体变化范围较小,由0.991 1减小到0.990 7。

Effect of air cooled spraybar heat insulation sleeve height on performance of mixer and diffuser

For the mixer and diffuser of air cooled spraybar rod, the three-dimensional numerical simulation model based on the Navier-Stokes equation was created. Through numerical simulation, the principle of the effect of different air cooled spraybar heat insulation sleeve heights on the mixer and diffuser integration aerothermodynamic performance of flow fluid, flow resistance characteristics and mixing characteristics was obtained. The results show that air cooled spraybar heat-insulation-sleeve height has little effect on the thermal efficiency of the mixer and diffuser, and that the overall range of variation is less than 0.008. The static-pressure recovery coefficient declines as the air cooled spraybar heat-insulation-sleeve height increases; the flow resistance and pressure loss coefficients of the mixer and diffuser increase with the growing height of air cooled spraybar heat-insulation-sleeve. At the outlet section of the mixer and diffuser, the total-pressure recovery coefficient declines as the air cooled spraybar heat-insulation-sleeve height increases, and the total variation range is small andreduced from 0.991 1 to 0.990 7.