采用流动控制的超声速内埋物投放特性研究

Investigation on characteristics of store release from internal bay in supersonic flow under flow control

针对马赫数Ma>3飞行状态下的内埋物安全投放难题,提出了两种适用于非平坦舱体外形的超声速内埋物投放分离过程的流动控制方法:第一种方法采用了圆棒扰流器,第二种方法采用气帘喷流。为了验证两种不同流动控制方法的效果,引入结构嵌套六自由度动态网格技术和基于k-ω湍流模型的Navier-Stokes方程计算,对包括重力投放、弹射投放、采用圆棒扰流器的重力投放和采用气帘的重力投放等4种不同的投放分离状态进行了动态全过程的计算对比分析。通过对仿真计算结果分析发现,当来流马赫数Ma∞>3时,采用流动控制的投放物分离运动特性产生了明显的变化。由投放物下落过程中的俯仰偏航特性可以得出:采用圆棒流动控制有利于安全分离;气帘流动控制具有应用潜力,但采用这种方法需要针对特定的投放条件进行优化,否则可能诱发投放物在俯仰方向的姿态发散。

To solve the problem of safety release of internal bay at supersonic condition （Mach number Ma〉3）, two methods of flow control which are suitable for supersonic internal bay with a large curvature contour are proposed in this paper. About the two different flow control methods, one uses a rod spoiler, and the other uses a jet screen. In order to verify their effectiveness, comparison and analysis of supersonic store release in four different ways including gravity release, ejection release, gravity release with rod spoiler and gravity release with jet screen is presented through a series of simulation, by using six degrees of freedom moving body by leveraging the overset gridding technique and Navier-Stokes solution based on k-ω turbulence model. Based on the result, dynamic characteristics of store separation with flow control obviously change at free stream Mach number Ma∞ 〉3. The following conclusions can be reached based on pitch/yaw property during store dropping： the rod spoiler is favorable to safe separation; the jet screen has application potential; however, parameters of jet screen should be designed in optimum according to specific condition, otherwise store may be induced to an attitude di- vergence in pitch.