非对称飞行器级间分离时喷流干扰特性试验研究

针对非对称飞行器在稠密大气层内级间分离时喷流干扰下的气动特性问题,采用捕获轨迹试验的网格测力技术和喷流试验技术相结合的试验方法,进行了风洞试验研究,研究了在不同来流马赫数、不同迎角、级间分离时一级与二级不同相对位置以及有无喷流状态下的气动干扰特性。详细论述了模型在风洞中的支撑方式、试验方案、喷流模拟参数的选择等,给出了典型试验结果,并进行了详细分析。结果表明:无喷流时,级间分离过程中的干扰流场使二级飞行器法向力减小,产生抬头俯仰力矩;喷流干扰则使法向力进一步减小,使抬头俯仰力矩进一步增大。试验结果已成功应用于某飞行器飞行试验中,试验数据精度满足工程要求,并被飞行试验验证。

Experimental investigation on jet interference characteristics at stage separation of a non-symmetric vehicle

In order to investigate the aerodynamic characteristics influenced by the jet of a non-symmetric vehicle at the separation stage in the dense atmosphere,the jet interference experiments were conducted in the wind tunnel utilizing the grid force measurement technique of the captive trajectory experiment and the jet experiment technique.The jet interference aerodynamic characteristics were investigated for the different free-stream Mach numbers,different angles of attack,different relative positions between the first and the second stage,and with/without jet.To demonstrate the experiment,the method to bolster the model in the wind tunnel,the scenario of the experiments,and the configuration parameters were presented,and the typical experimental results were analyzed and discussed in detail.The results show that for the vehicle studied in this paper,the normal force of the second stage decreases and the pitching moment increases under the interference of separation,while the normal force becomes smaller and the pitching moment becomes greater under the jet interference.Meanwhile,the experimental data have been applied in the in-flight test successfully,which indicates the experimental data meet the requirements of engineering margin and the proposed method is valid.