Influence of surface roughness on the aerodynamic characteristics of the nozzle ring of a variable mixed-flow turbocharger

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (22) : 312-321.

WEN Huabing1, WANG Jiahao1, YU Keliang1, GUO Junhua1, LIU Hongdan2 , LIU Yang2

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Abstract

Solid particles in the exhaust gas of a marine diesel engine can cause erosive wear on a variable-mix turbine, resulting in material spalling from the nozzle ring surface, increased surface roughness, and reduced nozzle ring service life. In this study, ANSYS CFX software is used to investigate the effects of surface roughness from wear on the nozzle ring flow field, static pressure and turbine performance under different openings based on Euler-Lagrange method and Finnie wear model for gas-solid two-phase flow. The study shows that: the thickness of the flow boundary layer, static entropy, turbulent kinetic energy and surface friction coefficient on both sides of the nozzle ring suction and pressure surfaces increase with increasing roughness, resulting in increased flow loss near the boundary layer, increased gas internal energy and increased energy dissipation; the static pressure difference between the two sides of the nozzle ring increases with increasing roughness, which makes the nozzle ring structure load increase and may reduce the nozzle ring life; with the surface roughness increases, the turbine efficiency decreases, but the rate of reduction is reduced, the degree of impact on the different degrees of opening is also different.

Key words

Variable mixed flow turbine nozzle ring / Exhaust particles / Erosion wear / Surface roughness / Numerical simulation

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WEN Huabing1, WANG Jiahao1, YU Keliang1, GUO Junhua1, LIU Hongdan2,LIU Yang2. Influence of surface roughness on the aerodynamic characteristics of the nozzle ring of a variable mixed-flow turbocharger[J]. Journal of Vibration and Shock, 2023, 42(22): 312-321

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