| 防爆柴油机活塞的热载荷响应特性研究 |
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| 引用本文： | 胡雪芳,陈肖媛. 防爆柴油机活塞的热载荷响应特性研究[J]. 液压与气动, 2021, 0(1): 99-104. DOI: 10.11832/j.issn.1000-4858.2021.01.015 |
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| 作者姓名： | 胡雪芳 陈肖媛 |
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| 作者单位： | 青岛黄海学院， 山东青岛 266427 |
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| 基金项目： | 山东省自然科学基金(ZR2016EEB36) |
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| 摘 要： | 为提升矿用防爆柴油机的换热能力,提出水冷代替油冷方案,对燃烧室内活塞的热载荷响应特性进行了研究与分析.基于CFD方法,建立活塞冷却腔内的气液两相流模型,选用SSTk-ω湍流模型,结合VOF模型和Level Set模型得出不同曲轴转角下的液相比例和对流换热系数变化规律,分析了冷却腔结构对传热效果的影响.构建活塞热机耦合模...
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| 关 键 词： | 防爆柴油机 活塞 传热 CFD 热机耦合 两相流 |
Thermal Load Response Characteristics of Explosion-proof Diesel Engine Piston |
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| HU Xue-fang,CHEN Xiao-yuan. Thermal Load Response Characteristics of Explosion-proof Diesel Engine Piston[J]. Chinese Hydraulics & Pneumatics, 2021, 0(1): 99-104. DOI: 10.11832/j.issn.1000-4858.2021.01.015 |
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| Authors: | HU Xue-fang CHEN Xiao-yuan |
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| Affiliation: | Qingdao Huanghai University, Qingdao, Shandong 266427 |
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| Abstract: | In order to improve the heat transfer capacity of mine explosion-proof diesel engine, a water cooling instead of oil cooling scheme is proposed. The thermal load response characteristics of the piston in the combustion chamber are studied and analyzed. The gas-liquid two-phase flow model of piston cooling chamber is established based on CFD method. SST k-ω turbulence model, VOF model and level set model are used to obtain the variation rules of liquid phase ratio and convective heat transfer coefficient under different crankshaft angles, and the influence of cooling chamber structure on heat transfer effect is analyzed. The thermal mechanical coupling model of the piston is established, and the thermal stress and thermal deformation of the piston under the limit conditions are calculated. The results show that the ratio of liquid phase in the cooling chamber is not the only factor determining the heat transfer efficiency, and the oscillating effect of liquid phase can significantly increase the convective heat transfer coefficient. The thin-wall deformation of the piston head is mainly affected by the thermal load, and is less affected by the pressure and inertial force in the cavity. |
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| Keywords: | explosion-proof diesel engine piston heat transfer CFD thermo mechanical coupling two phase flow |
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