CAJ | 학술논문

为探究叶顶泄漏流动对小展弦比高负荷跨声速转子气动性能的影响，利用数值模拟的手段，对不同尺度叶顶间隙下低反动度转子的全工况特性以及叶顶区域的流场结构进行了详细分析。研究结果表明，无叶顶间隙条件下，转子峰值效率最高，但其工作范围较窄；叶顶泄漏流动可在一定程度上抑制角区分离流动在流道内部的发展，延缓失速的触发，转子喘振裕度提升20%以上；较大尺度叶顶间隙下，波涡干涉导致叶顶泄漏涡破碎，但采用低反动度设计理念可控制破碎的泄漏涡在流道内部不发生大尺度的扩散，从而进一步地保证了转子在近失速点处仍具有较高的效率；综合考虑多方面气动性能要求，对于此类转子应存在最佳的叶顶间隙值。
위탐구협정설루류동대소전현비고부하과성속전자기동성능적영향，이용수치모의적수단，대불동척도협정간극하저반동도전자적전공황특성이급협정구역적류장결구진행료상세분석。연구결과표명，무협정간극조건하，전자봉치효솔최고，단기공작범위교착；협정설루류동가재일정정도상억제각구분리류동재류도내부적발전，연완실속적촉발，전자천진유도제승20%이상；교대척도협정간극하，파와간섭도치협정설루와파쇄，단채용저반동도설계이념가공제파쇄적설루와재류도내부불발생대척도적확산，종이진일보지보증료전자재근실속점처잉구유교고적효솔；종합고필다방면기동성능요구，대우차류전자응존재최가적협정간극치。
In order to study the effects of the tip leakage flow on the aerodynamic performance of a small as?pect-ratio highly-loaded transonic rotor,numerical simulation is carried out for analysis of the all operating con?ditions and flow structures near the tip at different tip gap in detail. The results show that,under the condition of zero tip gap, the rotor has the highest peak efficiency while the narrowest working range. The existence of leak?age flow could suppress the development of the corner separation in the flow passage,which helps to delay the triggering of stall and raise the rotor stall margin by 20%. The tip leakage vortex is broken down after interacting with the shock wave at a higher tip gap,however,adoption of the low-reaction design idea could control the bro?ken vortex not to spread in a large extend. This could guarantee a higher efficiency for the rotor even at near stall condition. Taking all the aerodynamic aspects into consideration, for this kind of rotor, an optimal tip gap should be existed.