Effect of direct water injection timing on cycle performance and emissions characteristics within a CI-ICRC engine

Zhe Kang; Yang Bai; Shangsi Feng; Jingtao Wu; Zhijun Wu

Alexandria Engineering Journal (Jun 2023)

Effect of direct water injection timing on cycle performance and emissions characteristics within a CI-ICRC engine

Zhe Kang,
Yang Bai,
Shangsi Feng,
Jingtao Wu,
Zhijun Wu

Affiliations

Zhe Kang: College of Mechanical and Vehicle Engineering, Chongqing University, Chongqing 400044, China; State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China; Chongqing Automotive Collaborative Innovation Center, Chongqing University, Chongqing 400044, China; Corresponding author at: College of Mechanical and Vehicle Engineering, Chongqing University, Chongqing 400044, China.
Yang Bai: College of Mechanical and Vehicle Engineering, Chongqing University, Chongqing 400044, China; State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China
Shangsi Feng: College of Mechanical and Vehicle Engineering, Chongqing University, Chongqing 400044, China; State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044, China
Jingtao Wu: School of Automotive Studies, Tongji University, Shanghai 201804, China
Zhijun Wu: School of Automotive Studies, Tongji University, Shanghai 201804, China

Journal volume & issue: Vol. 72
pp. 135 – 145

Abstract

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By establishing oxy-fuel combustion, direct water injection and waste heat recovery within conventional diesel engine, the compression ignition-internal combustion Rankine cycle (CI-ICRC) concept can be realized. It is capable of achieving ultra-high thermal efficiency and low emission. There have been studies on DWI timing in homogeneous charge compression ignition (HCCI) mode, but no systematic researches within CI-ICRC. Therefore, a prototype CI-ICRC engine is established in this work, the cycle performance (including in-cylinder pressure, heat release rate, brake thermal efficiency, etc.) and emission characteristics under different DWI timings are compared. The prototype engine was operated at 800 r/min. DWI temperature, pressure and duration are kept constant at 433 K, 35 MPa and 2 ms. The results indicate that DWI before combustion is more effective in reducing combustion intensity. The optimum DWI timing within this study is 320℃A, while the brake thermal efficiency (BTE) reaches the maximum of 46.6 % with a coefficient of variation close to 1 %. NOx and soot emissions are optimized but CO and HC emissions slightly increased with the utilization of DWI. The experimental results can provide guidance for future CI-ICRC engine optimization, and can also be utilized in providing reference information for DWI utilization within other novel internal combustion engine (ICE) concepts.

Published in Alexandria Engineering Journal

ISSN: 1110-0168 (Print); 2090-2670 (Online)
Publisher: Elsevier
Country of publisher: Egypt
LCC subjects: Technology: Engineering (General). Civil engineering (General)
Website: http://www.journals.elsevier.com/alexandria-engineering-journal/

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