轴对称双喉道流体控制矢量喷管三维数值模拟

3D Computational Study of Axisymmetric Dual-throat Fluidic Thrust-vectoring Nozzles

对轴对称双喉道流体控制矢量喷管的流场进行了数值模拟,研究了喷管气动参数(主、次流落压比)对其内特性(流量系数、推力系数、推力矢量角和推力矢量效率)的影响,并与试验数据进行了对比。研究结果表明,在计算工况下,当喷管次流流量比恒定时,喷管推力矢量角随主流落压比的升高而降低,喷管流量系数和推力系数先是随主流落压比的升高而升高,在某一主流落压比时达到最大值,而后喷管推力系数随主流落压比的升高逐渐降低,流量系数则基本维持不变。当喷管主流落压比固定时,随着次流落压比的升高,推力矢量角也随之增加,推力系数无明显变化,而流量系数则呈下降趋势。

Numerical studies of internal performance（discharge coefficient, thrust ratio, vector angle and thrust vectoring efficiency） on flow field of axisymmetric dual-throat fluidic thrust-vectoring nozzles were performed, and the computed data were compared with experimental data. The results indicated that for the steady secondary injection rates, vector angle reduced with increasing the primary flow pressure ratio, while discharge coefficient and thrust ratio increased with increasing the primary flow pressure ratio, and when it reached the highest, the thrust ratio gradually reduced and discharge coefficient kept steady. When the primary flow pressure ratio kept unchanged, the vector angle increased, thrust ratio kept steady and discharge coefficient reduced with increasing the secondary flow pressure ratio.