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《Journal of Xi'an Jiaotong University》 2018-09
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Effects of Swirl Ratio and Density Ratio of Slot Jet Flow on the Turbine Endwall Cooling and Suction Surface Phantom Cooling Performance

ZHANG Kaiyuan;LI Zhigang;SONG Liming;LI Jun;School of Energy and Power Engineering,Xi'an Jiaotong University;Collaborative Innovation Center of Advanced Aero-Engine;  
The effects of four swirl ratios of 0.4,0.6,0.8 and 1.0 and three density ratios of1.0,1.5 and 2.0 in the upstream slot jet flow with preswirl on the turbine endwall cooling and suction surface phantom cooling performance are numerically investigated using the threedimensional Reynolds-averaged Navier-Stokes(RANS)equations and the SST turbulent model.The computational model of the turbine endwall taking into account the upstream slot jet flow,the film cooling on the endwall surface and the gap in the cascade passage is taken as the analysis objective.The results indicate that at a low density ratio,decreasing the swirl ratio of the slot jet flow has a negative effect on the endwall cooling effect.At a high density ratio,the cooling effect first decreases and then increases,with the minimum value appearing at the swirl ratio of 0.8.The density ratio has a negative effect on the cooling performance,and the position of the lowest effect moves downstream with the swirl ratio.By reducing the relative motion of the coolant androtor,the phantom cooling coverage of the slot jet flow becomes smaller and moves downstream,close to the endwall,which results in a lower phantom cooling effect.Increasing the density ratio of the coolant results in a smaller phantom cooling coverage which moves to the endwall,hence reducing the phantom cooling effect on the blade suction surface.
【Fund】: 国家自然科学基金资助项目(51776151)
【CateGory Index】: TK471;V231.1
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