腔室型旋流发生器的设计与仿真研究

Design and Numerical Simulation for Chamber Swirl Generator

为了模拟旋流畸变对压气机性能和稳定性的影响,设计了一套腔室型旋流发生器,通过灵活改变腔室几何构形来形成不同类型和强度的旋流,利用先进的CFD数值模拟方法开展了旋流器流场特征的研究并对旋流畸变指标进行了详细分析。结果表明,腔室型旋流发生器能够产生不同强度的整体涡和对涡旋流,气动交界面处整体涡最大旋流角可以达到65.8°,对涡最大旋流角可以达到58.2°;在压气机进口截面,近壁面处旋流强度最大,整体涡可达43.5,对涡可达9.26;整体涡主要影响叶尖流场,对涡主要影响叶尖和叶根的流场。随着流量的增加,旋流器总压恢复系数降低,整体涡强度增加,对涡强度降低。

In order to simulate the effects of swirl distortion on the performance and stability of compressor,a set of chamber swirl distortion generator was designed and the geometric configuration can be changed flexibly to inform different types and intensity of swirl. Characteristic of generatoristic inside flow and swirl distortion descriptors was quantified and carried out by the advanced CFD simulation method. The numerical simulation results show that both twin swirl and bulk swirl can be produced by these swirl generators. The angle of bulk swirl at AIP can reach to 65. 8°,the angle of paired swirl can reach to 58. 2°. At the inlet section of compressor,the intensity of bulk and paired swirl can reach to 43. 5 and 9. 26,respectively and the swirl near the wall is greatest.Bulk swirl influences the flow field at tip regions but paired swirl influences tip and hub regions. When mass flow increases,the total pressure recovery coefficient decreases and bulk swirl intensity increases and the paired swirl intensity decreases.