Corner separation is a common flow structure in axial compressors. Especially in off-design conditions, corner separation will result in reduced compressor efficiency and reduced pressurization capacity. In order to further enhance the aerodynamic performance of the compressor, it is necessary to deeply understand the flow mechanism and influencing factors of angular separation. In response to this scientific problem, the research team of the Industrial Gas Turbine Laboratory of the Institute of Engineering Thermophysics of the Chinese Academy of Sciences adopted a combination of planar cascade experiments and three-dimensional CFD numerical simulation to analyze the angular flow separation structure and loss characteristics under the typical operating conditions of the compressor. In-depth exploration.
Figure 1 shows the variation curve of the angle of attack of the total pressure loss of the compressor cascade vane. The comparison between experimental and numerical results proves that the three-dimensional CFD program has good credibility.
Fig. 2 and Fig. 3 are the three-dimensional flow field structure of the blade under the design condition and corner stall condition and the total pressure loss after the grid. Due to the addition of the transition model in the numerical calculation model, the laminar flow separation phenomenon on the blade suction surface can be well captured. Under the design conditions, slight angular separation occurred and the loss after the grid was small. In the stall condition of the corner area, the separation of the corners takes up a larger range of chords and chords, and the high loss area behind the grid increases significantly.
The above research results show that the separation flow structure and loss will be different in the corner area of ​​the compressor under different operating conditions. As the angle of attack increases, the influence range of the corner separation will increase and the loss will increase. The relevant results have been included in the Journal of Aeronautical Power and the Journal of Engineering Thermophysics. The scientific research team will further explore the influencing factors of the angular separation of the axial compressor and explore more effective methods of controlling the angular separation of the compressor.
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