Research on Heat Transfer Characteristics of Center Swing of Micro Free-piston Swing Engines
Due to the small structure of the micro free-piston swing engine,its only moving part,the center swing,is prone to deformation and jam-ming after being heated,resulting in the engine failing to operate normally or a serious decline in thermal efficiency.To solve this problem,the center swing made of ceramic matrix compos-ites is proposed,an unsteady-state heat transfer model of the center swing is established in the cylindrical coordinate system,and the finite el-ement method is used to analyze the influence law of the changes of center swing materials and structural dimensions on its deformation.The research shows that,among the four select-ed materials,SiO2 ceramic matrix composite for the center swing has the smallest deforma-tion after being heated,and when the radius of the center swing is 21 mm and 23 mm respec-tively,its overall deformation changes slightly with the rise of the center swing temperature.This research can provide a theoretical refer-ence for the research on the deformation of the center swing of the micro free-piston swing engine and the overall thermal efficiency.
Micro free-piston swing engineCeramic matrix compositeHeat transfer modelThermal deformation
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