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research-article

Simulation Optimization of a New Twin-entry Turbocharger Turbine with Double Incidence Angles

[+] Author and Article Information
Houchuan Fan

School of Automotive Studies, Tongji University, Shanghai 201804, China
sd042008@163.com

Jimin Ni

Professor, School of Automotive Studies, Tongji University, Shanghai 201804, China
njmwjyx@hotmail.com

Xiuyong Shi

School of Automotive Studies, Tongji University, Shanghai 201804, China
shixy@tongji.edu.cn

Dayong Qu

Fengcheng SDT Turbo Co., Ltd, Erlong Modern Industrial Zone,Fengcheng City 118100, China
qusdt@yahoo.com

Yi Zheng

Fengcheng SDT Turbo Co., Ltd, Erlong Modern Industrial Zone, Fengcheng City 118100, China
zysdt@yahoo.com

Yinghong Zheng

Fengcheng SDT Turbo Co., Ltd, Erlong Modern Industrial Zone, Fengcheng City 118100, China
zyhsdt@yahoo.com

1Corresponding author.

ASME doi:10.1115/1.4041315 History: Received August 02, 2017; Revised August 06, 2018

Abstract

This paper discusses the performance and the mass flow characteristics of a new twin-entry turbocharger turbine with a fixed nozzle entry and a nozzleless entry for automotive application. Because the configuration based on a conventional twin-entry nozzleless turbine has both a fixed nozzle entry and nozzleless entry simultaneously, and the fixed nozzle entry and the nozzleless entry have different turbine incidence angles, stratified flow is formed in the turbine inlet. The numerical simulation results show that the new turbine with double incidence angles has higher efficiency compared to the original twin-entry nozzleless turbine, especially in low-speed condition, which can greatly improve the low-speed torque of engine. By investigating the installation locations of the fixed nozzle, it is beneficial to improve the turbine efficiency when the fixed nozzle is set at the outer scroll near the turbine outlet. The influence of the installation angle on the turbine performances was studied in order to optimize the turbine structure and to find out the rules of the turbine efficiency and mass flow. It shows that 60° is the optimal vane angle. This paper introduces the concept of the double turbine incidence angles and the optimization of the configuration.

Copyright (c) 2018 by ASME
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