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绳牵引并联机构(WDPR)能够有效调整飞行器模型的位姿,为扩展风洞试验能力提供了一种新型支撑手段,具有很大的应用潜力。本文将对其在高超声速风洞中应用所涉及的稳定性与气动干扰问题进行研究。以10°尖锥标椎模型为例,设计了8绳牵引的并联支撑系统,可以通过调整绳长控制模型的位置和姿态。模拟了气动载荷作用下支撑系统的稳定性,优化牵引绳直径。基于构建的三维模型,借助CFD软件进行气动计算,包括马赫数为7.8时,不同迎角下绳牵引并联支撑锥体模型的气动力系数,通过与无绳支撑结果以及文献试验数据进行比较,表明在小迎角情况下,绳系支撑引起的气动干扰相对误差较小,但会随迎角的增大而增加。此外,分别对弯刀支撑和绳牵引并联支撑进行了模态分析,对比了2种支撑的固有频率。结果显示绳系支撑固有频率较高,系统刚度较大。本文的理论研究成果可为绳牵引并联支撑技术在高超声速风洞中的应用提供一定的技术支持。
The parallel towing mechanism (WDPR) can effectively adjust the posture of the aircraft model, providing a new support method for expanding the wind tunnel test capability and has great potential for application. In this paper, the stability and aerodynamic interference problems involved in the application of hypersonic wind tunnels will be studied. Taking the 10 ° sharp cone model as an example, a parallel support system of 8-rope traction was designed, and the position and attitude of the model can be controlled by adjusting the rope length. The stability of the supporting system under aerodynamic loads is simulated and the diameter of the pulling rope is optimized. Based on the constructed three-dimensional model, the aerodynamic force was calculated by CFD software, including the aerodynamic coefficient of the parallel-supported cone-beam model under different angles of attack at a Mach number of 7.8. Comparing with the results of cordless support and the experimental data, The small relative angle of attack, rope support caused by aerodynamic interference relative error smaller, but will increase with the angle of attack increases. In addition, the modal analysis of parallelepiped support and rope support parallel support were carried out respectively, and the natural frequencies of the two supports were compared. The results show that the natural frequency of the rope support is higher and the system rigidity is larger. The theoretical research results in this paper can provide some technical support for the application of the rope-supported parallel support technology in the hypersonic wind tunnel.