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    • Study on the Effects and Optimization of Exhaust Back Pressure on the Performance of a High-Speed Marine Engine
    DOI：10.13949/j.cnki.nrjgc.2022.03.004
    Key Words:exhaust back pressure  high-speed marine engine  multi-objective optimization
    Author NameAffiliationE-mail
    DONG Fei* School of Naval Architecture， Ocean and Energy Power Engineering， Wuhan University of Technology， Wuhan 430063， China feidongfly@163.com 
    HU Nao* School of Naval Architecture， Ocean and Energy Power Engineering， Wuhan University of Technology， Wuhan 430063， China
    Key Laboratory of Transportation Industry of Marine Power Engineering Technology， Wuhan 430063， China
    National Engineering Laboratory for Marine and Ocean Engineering Power System， Wuhan 430063， China     		nao.hu@whut.edu.cn 
    YANG Jianguo School of Naval Architecture， Ocean and Energy Power Engineering， Wuhan University of Technology， Wuhan 430063， China
    Key Laboratory of Transportation Industry of Marine Power Engineering Technology， Wuhan 430063， China
    National Engineering Laboratory for Marine and Ocean Engineering Power System， Wuhan 430063， China     		 
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    Abstract:A one-dimensional simulation model of a high-speed marine engine was established and validated in GT-Power software to improve the performance of a high-speed marine engine under high exhaust back pressure conditions. To solve the problem that the performance of the high-speed marine engine drops drastically under the condition of high exhaust back pressure， a small-flow turbocharger was matched and the key parameters of the intake system and the fuel injection system were optimized by using the particle swarm optimization algorithm. Results indicated that the increase of the exhaust back pressure had a significant effect on the engine performance， which led to the increase in fuel consumption rate and the drastical decrease in engine power. The optimized intake system and fuel injection system significantly improved the engine performance under high exhaust back pressures. Under the exhaust back pressure of 170 kPa， the engine exhaust temperature in front of the exhaust turbine was reduced by 99.3 ℃. Meanwhile， the power increased by 9.9% and the residual exhaust coefficient decreased by 5.8%. Thus， the decrease of power performance and thermal load caused by the increase of exhaust back pressure was significantly alleviated.
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