对涡旋流畸变对单级跨声速压气机性能影响的数值研究

Effects of Paired Swirl Distortion on Single Stage Transonic Compressor Performance Using Numerical Simulation

关键词:  旋流畸变  对涡旋流  数值仿真  压气机性能  稳定性

Key words:  Swirl distortion  Paired swirl  Numerical simulation  Compressor performance  Stability

摘要:

为了评估弯曲进气道中显著的旋流畸变对压气机性能和稳定性的影响，利用CFD技术开展了Stage 35在对涡旋流畸变下的数值仿真，获得了对涡旋流畸变下的压气机特性线和流场分布，并与无畸变和正负整体涡时的情形进行了对比分析。结果表明:对涡旋流畸变会使压气机的性能和稳定裕度降低，且工作点处于同等强度的正负整体涡旋流畸变工作点之间，在90%换算转速和对涡旋流模式P2下，压气机换算流量、压比、温比、效率和稳定裕度的最大降幅分别为8.00%，7.24%，0.98%，9.64%和43.14%。这种影响主要取决于占主导的旋流畸变类型和不同类型旋流畸变对压气机性能参数影响程度的共同作用。同时压气机换算转速和旋流强度越大，压气机性能参数和稳定裕度下降越多。

Abstract:

Numerical simulation of Stage 35 with paired swirl was carried out using CFD technology in order to estimate the effects of severe swirl distortion caused by serpentine inlet on performance and stability of compressor. The compressor characteristic map and flow field with paired swirl distortion was calculated by this method and compared with characteristic map and flow field with clean，positive bulk swirl and negative bulk swirl inflows. The results show that compressor trends to a lower performance and stability margin with paired swirl distortion and the magnitude of its operation parameters are between with positive and negative bulk swirl distortion at constant swirl intensity. There is a maximum decrease of corrected mass flow rate，pressure ration，temperature ratio，efficiency and stability margin by 8.00%，7.24%，0.98%，9.64% and 43.14% respectively with 90% corrected speed and paired swirl pattern P2. These changes depend on the interaction of the dominant type of swirl distortion and the degree of impacts of different types of swirl distortion on performance parameters of compressor. Besides，decreases of performance parameters and stability margin of compressor become more with higher corrected speed and stronger swirl intensity.