1.大连依勒斯涡轮增压技术有限公司，辽宁 大连 116028；
2.大连交通大学机械工程学院，辽宁 大连 116028
Abstract：The simulation model of turbocharger is established and verified by experiment. The cases of increase and decrease of radial and axial clearance of wheel back cavity are respectively made，and the influence of radial and axial clearance of impeller wheel back plate cavity on aerodynamic axial force of centrifugal compressor is studied. The results show that the axial force is affected by the impeller wheel back plate cavity gap in different degrees. The axial force decreases as the radial and axial clearance decreases, among them radial clearance shows further influence on axial force. Compared with the original case, in the radial clearance case, the maximum change of axial force is 21.92% in small flow condition, and 38.00% in large flow condition, in the axial clearance case, the the maximum change of axial force is 6.26%.
Keywords:centrifugal compressor; impeller; cavity gap; axial force; simulation calculation