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research-article

Experimental Study of Ion Current Signals and Characteristics in an Internal Combustion Rankine Cycle Engine

[+] Author and Article Information
Zhe Kang

School of Automotive Studies, Tongji University, Shanghai, 201804, China
180kangzhe@tongji.edu.cn

Zhijun Wu

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

Lezhong Fu

School of Automotive Studies, Tongji University, Shanghai, 201804, China
flz19880926@sina.com

Jun Deng

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

Zongjie Hu

School of Automotive Studies, Tongji University, Shanghai, 201804, China
zongjie-hu@tongji.edu.cn

Liguang Li

School of Automotive Studies, Chinesish-Deutsches Hochschulkolleg, Tongji University, Shanghai, 201804, China
liguang@tongji.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4040288 History: Received December 01, 2016; Revised May 08, 2018

Abstract

The internal combustion Rankine cycle (ICRC) engine utilizes pure oxygen as the oxidant instead of air during combustion to prevent the generation of nitrogen oxide emissions and lower the cost of CO2 recovery. To control combustion intensity and increase efficiency, water injection technology is implemented as it can increase the in-cylinder working fluid during combustion process. To further enhance the system thermal efficiency, the injected water is heated using coolant and waste heat before being directly injected into combustion chamber. The main challenge of controlling the ICRC engine is the interaction between water injection process and combustion stability. Ion current detection provides a potential solution of real-time detection of in-cylinder combustion status and water injection process simultaneously. In this paper, the characteristics of ion current signal in an ICRC engine were studied. The results indicate the ion current signal is primarily affected by the combination of trapped water vapor injected in the last cycle and in-cylinder combustion intensity. The water vapor contributes to the ionization reactions which lead to enhanced ion current signals under water cycle. The ion current signal is capable of reflecting the operating conditions of the in-cylinder water injector. The phase of the ion current peak value has a linear relation as the water injection timing is delayed, and ion current detection technology has the potential to detect the combustion phase under different engine loads in an internal combustion Rankine cycle engine.

Copyright (c) 2018 by ASME
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