跨声速转子机匣孔式非定常抽吸扩稳机理研究

Mechanism Investigation of Stability Enhancement to Holed Unsteady Suction on a Transonic Rotor Casing

关键词:  跨声速转子  孔式非定常抽吸  流动稳定性  二次流结构  非定常特性

Key words:  Transonic rotor  Holed unsteady suction  Flow stability  Secondary vortex structure  Unsteady characteristics

摘要:

为了研究跨声速转子机匣孔式非定常抽吸的扩稳机理，以Rotor 37为研究对象，针对机匣孔式抽吸方案进行了非定常数值对比研究，探讨了抽吸前后转子总性能和失速裕度的变化规律，详细分析了近失速工况下转子的三维流场结构，建立了相应的动叶通道内涡结构模型；此外，进一步分析了非定常抽吸对叶尖流场非定常特性的影响。结果表明：采用机匣孔式抽吸可实现对叶尖泄漏流的有效控制，在保证转子效率的同时，将近失速工况的转子压比提升2.1%，失速裕度提升6.86%；非定常抽吸使得近失速工况下叶尖泄漏涡的尺寸明显减小，改善了叶尖区域流场的非定常特性，缓解了流场内的二次流流动堵塞，提升了转子叶尖流场的稳定性。

Abstract:

In order to investigate the mechanism of stability enhancement by holed unsteady suction on a transonic rotor casing， Rotor 37 was used to perform the unsteady numerical simulation comparison study. The effects of suction on the overall performance and stall margin of the compressor rotor were discussed， and the three-dimensional flow field structures inside the rotor were analysed at near stall condition in detail. The corresponding vortex structure model was established in the rotor blade passage. Furthermore， the effects of holed unsteady suction on the unsteady characteristics of tip flow field were investigated. The results show that the blade tip leakage flow was effectively controlled by the casing holed suction， and the rotor pressure ratio and stall margin at near stall condition increased by 2.1% and 6.86%， respectively， without the decrease of the rotor efficiency. The unsteady suction significantly reduces the relative size of tip leakage vortex structures at near-stall conditions， and besides the unsteady control improves the unsteady characteristics of flow field in tip region， alleviates secondary flow blockage in flow field， and thus enhances the stability of rotor tip flow field.