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    • Experimental and Simulation Study of Pressure Self-Adaptive Piston on Marine Engines
    DOI：10.13949/j.cnki.nrjgc.2022.05.004
    Key Words:pressure self-adaptive piston  marine engine  compression ratio  knock suppression
    Author NameAffiliationE-mail
    HE Yuhai* School of Naval Architecture， Ocean and Energy Power Engineering， Wuhan University of Technology， Wuhan 430063， China
    Key Laboratory of Ship Power Engineering Technology Transportation Industry， Wuhan 430063， China
    Electronic Control Sub Laboratory of National Engineering Laboratory of Naval Architecture and Ocean Engineering Power Systems， Wuhan 430063， China     		hyh@whut.edu.cn 
    WANG Dongkai School of Naval Architecture， Ocean and Energy Power Engineering， Wuhan University of Technology， Wuhan 430063， China  
    WANG Qinpeng* School of Naval Architecture， Ocean and Energy Power Engineering， Wuhan University of Technology， Wuhan 430063， China
    Key Laboratory of Ship Power Engineering Technology Transportation Industry， Wuhan 430063， China
    Electronic Control Sub Laboratory of National Engineering Laboratory of Naval Architecture and Ocean Engineering Power Systems， Wuhan 430063， China     		wangqpkevin@163.com 
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    Abstract:A pressure self-adaptive piston suitable for a high compression ratio was developed to take into account the thermal efficiency of the engine at low loads and non-knock at high loads. The performance of the pressure self-adaptive piston was tested on the engine bench by the experimental research method， the numerical simulation method was adopted to establish the numerical calculation model of the engine working process and the knock model on this basis. The displacement of the piston head， the influence of the piston on cylinder pressure， combustion cycle fluctuation， fuel consumption rate， and the knock suppression performance of the piston were studied. The results of bench test and simulation are shown as follows. By increasing the compression ratio， when the load is low， the piston head has no or small displacement. The pressure in the cylinder is higher than that of the original engine， and the fuel consumption rate is lower than that of the original engine. For example， the fuel consumption rate under 25% load condition is 6.67 g/（kW·h） lower than that of the original engine. When the load is high， the piston head displacement is large， which reduces the excessively high cylinder pressure and pressure rise rate， and effectively suppressed the knock. The maximum decrease of peak pressure cycle fluctuation coefficient is 1.11%， and the knock induction time integral under 100% load condition is 0.19 lower than that of the original engine.
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