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Technical Brief

A method for matching two-stage turbocharger systemand its influence on engine performance

[+] Author and Article Information
Binyang Wu

State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
binyang.wu@tju.edu.cn

Zhiqiang Han

Xihua University, Chengdu 610035, China
8312862@qq.com

Xiaoyang Yu

State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
yxy860701@163.com

Shuikai Zhang

State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
784047601@qq.com

Xiaokun Nie

State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China
niexiaokun@tju.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4039461 History: Received April 17, 2017; Revised February 04, 2018

Abstract

Matching of a two-stage turbocharging system is important for high efficiency engines because the turbocharger is the most effective method of exhaust heat recovery. In this study, we propose a method to match a two-stage turbocharging system for high efficiency over the entire range of operational conditions. Air flow is an important parameter because it influences combustion efficiency and heat load performance. First, the thermodynamic parameters of the engine and the turbocharging system are calculated in eight steps for selecting and matching the turbochargers. Then, by designing the intercooler intensity, distribution of pressure ratio, and compressor operational efficiency, it is ensured that the turbochargers not only meet the air flow requirements but also operate with high efficiency. The concept of minimum total drive power of the compressors is introduced at a certain boost pressure. It is found that the distribution of pressure ratio of the high- and low-pressure turbocharger should be regulated according to the engine speed by varying the rack position of the variable geometry turbocharger (VGT) to obtain the minimum total drive work. It is verified that two-stage turbochargers have high efficiency over the entire range of operational conditions by experimental research. Compared with the original engine torque, low-speed torque is improved by more than 10%, and the engine low fuel consumption area is broadened.

Copyright (c) 2018 by ASME
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