机身气动特性CFD计算与风洞试验结果相关性分析

Correlation Analysis on CFD Calculation and Wind Tunnel Test of Helicopter Fuselage Aerodynamic Characteristics

机身气动特性结果是直升机研制过程中重要的设计输入,目前主要通过风洞试验和CFD计算两种方法来获得,两种方法得到的机身气动特性结果存在一定的差异。首先对三种直升机机身模型的CFD计算与风洞试验结果进行了对比;之后分别采用增量法和比例法两种方法分析了两者的相关性。结果表明,在小角度时两者的差值基本不变,大角度时两者的比值基本一致。研究结果对提高CFD计算的可靠性和改进CFD计算结果修正方法有一定的作用。

The result of fuselage aerodynamic characteristics is important basic data in the research and development of helicopter.It is mainly obtained by two methods:CFD calculation and wind tunnel test,and the results obtained by the two methods have some differences.Firstly,the CFD calculation and wind tunnel test results of three different configurations helicopter fuselage models were compared.Then the correlation between two results was analyzed by the incremental method and the ratio method.The result showed that the difference between two results was basically the same at small angles,and the ratios of two results was basically the same at large angles.The research results played an important role in improving the reliability and correction method of CFD calculation results.