射流总压和角度对气动喉道控制喷管的影响

Effect of injection total pressure and angle on the pneumatic throat controlled nozzle

采用基于雷诺平均的二维Navier-Stokes方程和RNGκ-ε湍流模型的有限体积法,对在喷管喉道附近注入对称射流的二元收敛-扩张喷管全流场进行了数值仿真,分析了喷管处于不完全膨胀状态时射流压力和角度对喷管气动喉道面积以及对喷管性能的影响。结果表明,射流角度和射流总压两者对气动喉道面积控制范围都有显著影响,在所计算的工况下,喉道面积控制范围最大值出现在α=120°、SPR=1.15时,其值为24.53%;射流角度越大,喉道面积控制效率越高。在射流角度一定的情况下,射流总压增大,喉道面积控制效率减小,在所计算的工况下,KTAC最大值达到了5.2,对应的α=150°、SPR=1;喉道面积控制范围增大,喷管总压恢复系数减小。

The flow fields of 2-D convergent-divergent nozzle with symmetrical injection near the throat were calculated by the finite volume method based on 2-D Reynolds average Navier-Stokes equation and RNG K-e turbulence model. The effects of injection total pressure and angle on the pneumatic throat area and nozzle performance were analyzed when the prime flux is incomplete expanded. The results show that： both the injection total pressure and angle have remarkable effect on the range of throat area con- trol（RTAC）. The RTAC reaches 24.53% at the case of α= 120°, SPR = 1.15. The coefficient of throat area control （KTAC） in- creases with the increase of injection angle but decreases with the increase of injection total pressure when the injection angle is fixed. The RTAC reaches 5.2 at the case of α= 150°, SPR = 1.0. The coefficient of the total pressure recovery decreases with the increase of RTAC.