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为了研究转静子叶片排之间的轴向间距对压气机内部流动堵塞及气动性能的影响,选取某单级轴流压气机为研究对象,采用多通道非定常数值计算方法对其5种不同轴向间距下的内部流场进行了全三维数值模拟。结果表明:在每一种轴向间距下,当压气机节流至某一工况之后,压气机通道内的流动堵塞区主要集中在转子叶顶间隙区域和动叶吸力面尾缘附近以及静叶吸力面轮毂角区内;在同一流量下,随着轴向间距的减小,转子叶根吸力面尾缘处的流动堵塞区有所扩大,但转子叶顶间隙区域及静叶吸力面轮毂角区内的流动堵塞区体积却不断减小,压气机通道内回流区的总体积也随之减小,其结果是压气机的静压升能力和流动稳定性增强且效率增大。通过进一步研究发现:在同一流量下,当轴向间距减小时,转子叶顶间隙区域内的主流轴向动量增大且泄漏流的轴向动量减小,其结果是转子叶顶间隙区域内流动堵塞区的体积减小。
In order to study the influence of the axial distance between stator blades on the clogging and the aerodynamic performance of the compressor, a single-stage axial compressor was selected as the research object, and the unsteady numerical calculation method of five channels A full three-dimensional numerical simulation of the internal flow field at a distance is carried out. The results show that at each axial distance, when the compressor is throttled to a certain working condition, the flow blockage in the compressor passage mainly concentrates in the clearance area between the rotor tip and the suction edge of the moving blade, At the same flow rate, with the decrease of the axial distance, the flow blockage at the trailing edge of the root suction surface of the rotor blade is enlarged. However, the clearance area at the tip of the rotor and the suction surface of the stator blade hub The volume of the clogged flow area in the corner area is continuously reduced and the total volume of the recirculation zone in the compressor passage also decreases. As a result, the static pressure rise capability and the flow stability of the compressor are enhanced and the efficiency is increased. It is found through further research that when the axial distance decreases with the same flow rate, the main axial momentum in the rotor blade tip clearance area increases and the axial momentum of the leakage flow decreases. The result is the flow in the rotor tip clearance The volume of the clogged area is reduced.