高超声速风洞WDPR支撑尖锥模型应用可行性分析

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。

Feasibility analysis of WDPR support cone model application in hypersonic wind tunnel

Wire-driven parallel robot (WDPR)provides a new support method for wind tunnel tests due to its effective simulation of the aircraft model's pose,and has a great application potential. This paper gives details of an investigation of stability and aerodynamic interference referring to the application of WDPR in hypersonic wind tunnel. The parallel support system with 8 wires was constructed,and the 10° cone model was selected as the test model whose position and pose can be adjusted through the wire length. The support system's stability under the action of aerodynamic force is simulated,and the wire diameter is optimized. Based on the constructed three-dimensional model,under the condition of Mach numuber is 7. 8,the aerody-namic coefficient of the model suspended with WDPR at different angles of attack is calculated in CFD. The comparison of the simulation result with the result of the same model without wires and the experimental data in reference indicates that,at small angle of attack,the relative error of the aerodynamic interference caused by the wires is small,and the interference increases with the increase of angle of attack. In addition,modal char-acteristics of the WDPR and the crescent shape support system are analyzed and the natural frequencies of the two support systems are compared. The comparison result shows that the natural frequency and the stiffness of the WDPR are higher than those of the crescent shape support system. The academic research work of this pa-per provides reference to the application of wire-driven parallel support technology in hypersonic wind tunnel.