Research on the vortex breakdown and pressure loss characteristics in the cavity with anti-swirling waist circular drum hole
To reduce the pressure loss in a compressor disk cavity,an anti-swirling waist circular drum hole structure was designed.Large Eddy simulation(LES)and the RNG k-ε model were used to investigate the vortex evolution and pressure loss characteristics in the cavity,respectively,revealing the vortex breakdown mechanism and drag reduction mechanism of the anti-swirling waist circular drum hole.The results showed that the anti-swirling waist circular drum hole can reduce the pressure loss in the cavity.The high-speed vortex was intensified rapidly in the low region of the cavity with waist circular drum,and the vortex scale increased rapidly,resulting in the rapid increase of pressure loss coefficient with the radial height decrease.Compared with the waist circular drum hole,the anti-swirling waist circular drum hole can effectively restrain the vortex scale increase and reduce the pressure loss in the cavity by 15.6％.With simple structure and linear airflow characteristic,the anti-swirling waist circular drum hole has high engineering application value.
co-rotating cavitydrum holecoherent vortexvortex scalepressure loss
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