Numerical Simulation on Performance Deterioration of a Radial Flow Turbine due to Particle Erosion
As a key component for enhancing the performance and controlling emissions of diesel engines in vehi-cles,the turbine flow channel walls in a turbocharger are subjected to high-speed erosion from exhaust particles.It results in increasing roughness of the channel surfaces and reducing the turbine performance.Using a 65K radial flow turbine as a research object,the formation mechanism of erosion characteristics on flow channel walls and the impact on performance degradation based on two-phase flow numerical simulations were conducted.The results show that the local erosion rate of the flow channel wall is closely related to the asymmetry of the vortex shell ge-ometry,and the highest erosion rate occurs at the tongue of the volute.Within 50000 h of operation,the expected relative changes in the overall efficiency and mass flow parameter of the turbine were-3.5%and 1.1%,respectively,with the deterioration rates for the first 10000 h accounting for 56%and 70%of the total degradation rate,respectively.Based on actual road conditions of a tractor,empirical formulas for the deterioration of turbine performance over time was developed.
万方数据
维普
