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为了研究靴部结构对气动性能的影响,分别建立了光滑、局部开槽、轴向收敛三种指尖密封模型,并对其进行双向流固耦合数值模拟。通过计算,获得了指尖密封的变形规律、泄漏量变化以及指尖靴间隙内流场的运动特性。与普通指尖密封结构相比,对密封靴部进行改进可较大程度地提高密封的性能。根据对泄漏及流场运动特性的分析,初步揭示了指尖密封的泄漏机理,同时阐述了开槽结构影响密封性能的根本原因。
In order to study the influence of boot structure on aerodynamic performance, three kinds of fingertip seal models, which are smooth, partially grooved and axially convergent, were established and their numerical simulations were carried out. Through the calculation, the deformation law of the fingertip seal, the change of the leakage volume and the movement characteristics of the flow field in the fingertip boot clearance were obtained. Compared with ordinary fingertip seal structure, the improvement of the sealing boot can greatly improve the sealing performance. According to the analysis of leakage and flow field characteristics, the leakage mechanism of fingertip seal is revealed. At the same time, the root cause of the slotted structure affecting the sealing performance is expounded.