Flow Channel Wall Erosion Characteristics and Impacts on Performance in Radial Turbines
Carbon particles,as inherent products of internal combustion engine combustion,might cause erosion on channel walls of turbines when carried by the mainstream and affect perform-ance after prolonged operations.The erosion characteristics of the walls of a certain radial flow turbine were calculated by means of two-phase flow numerical simulation,and the effects of various key pa-rameters on the erosion rate density and performance deterioration of the turbine were investigated.The results show that the distribution characteristics of wall erosion are impacted by particle sizes and the effects on performance exhibite a non-linear changing pattern.Particle emission margin and expan-sion ratio presented a linear relationship with the change rate of the performance.The variations in turbine speed show a linear relationship with the efficiency change rate and exhibit a rapidly increasing and then continuously decreasing relationship with the change rate of the mass flow parameter(MFP).Particle sizes and turbine operating conditions are significant factors affecting the change rate of tur-bine performances,which are 5～7 times and 19～24 times greater than the effects of particle emission margin and expansion ratio on the change rate in efficiency and MFP,respectively.
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