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根据已知的直升机吊挂的几何尺寸,利用CAD软件建立了两种吊挂的三维模型.利用图像测绘的方法对第1种吊挂尾鳍进行了初步设计,通过计算流体力学(CFD,Com-putational Fluid Dynamics)方法对带尾鳍的吊挂模型进行了计算与分析,气动力计算结果与理论计算结果吻合较好.此外,对第2种UH-60黑鹰直升机带尾鳍吊挂进行了CFD计算,考察了尾鳍对吊挂流场的影响.通过对两种带尾鳍的直升机吊挂情况的计算分析,证明了尾鳍对保证吊挂在飞行过程中的航向稳定性具有关键的作用,进而提出了一种基于无空气阻尼力假设的直升机吊挂尾鳍尺寸的设计方法,并对第2种吊挂状态下的尾鳍尺寸进行了计算设计.计算所得到的尾鳍面积对航向稳定性的影响结果与国外风洞实验结果保持一致.
According to the known geometric dimensions of helicopter hanger, two kinds of hanging three-dimensional models are established by using CAD software.The first suspension caudal fin has been preliminarily designed by means of image mapping, and CFD (Computational Fluid Dynamics) putational Fluid Dynamics method was used to calculate and analyze the suspension model with caudal fins, and the aerodynamic calculation results were in good agreement with the theoretical calculation results.In addition, CFD calculation was carried out on the second type of UH-60 Black Hawk helicopter with caudal fin suspension , The effect of caudal fin on the flow field of suspension is investigated.The calculation and analysis of two kinds of helicopter suspensions with caudal fin proves that the caudal fin plays a key role in ensuring the heading stability of the suspension during flight, A design method of helicopter suspension tail fin size based on the assumption of no air damping force is proposed and the tail fin size of the second suspension model is calculated.The results of the calculation of the tail fin area effect on the heading stability are compared with those of abroad Wind tunnel experiment results are consistent.