逆流推力矢量喷管基本流动特征的数值研究

 利用数值模拟的方法，通过对逆流方案中喷管气动性能的研究验证了逆流推力矢量方案的可行性。在非矢量状态下主喷管出口截面上的流量系数和推力系数分别达到99.2%和98.8%；矢量化状态下最大推力矢量角超过了20°，而推力系数与非矢量状态下的比较下降不超过3.7%，且最大抽吸二次流量比仅为2.1%。此外，对该方案中一些基本的流动特征进行了分析，得到了抽吸二次流量比与推力矢量角的变化关系所揭示的流场结构，并对此进行了详细解释，同时揭示了逆流剪切层强烈的湍动特性和大涡结构的特点。

Numerical Research on Basic Flow Characteristics of Counterflow Thrust Vectoring Nozzle

The feasibility of counterflow scheme is validated by research on the internal aerodynamic characteristics of nozzle using numerical simulation. Without vectoring, the discharge coefficient achieves 99.2% and the thrust coefficient achieves 98.8% at the exit of main nozzle. With vectoring, the thrust vector angle exceeds 20°. The decline of thrust coefficient is less than 3.7%, and the maximum percent of the secondary weight flow rate to the primary weight flow rate is just 2.1%. Moreover, some basic flow characteristics of the scheme have been conducted. And the flow structures are discovered by a material explaination of the relationship between the percent of the secondary weight flow rate to the primary weight flow rate and the thrust vectoring angle. The characteristics of turbulent energy and eddy of counterflow shear layer are attained.