四冲程气动发动机气缸内流场特性研究  

Research on Flow Field Characteristics in Cylinder of a Four-Stroke Compressed Air Engine

作　　者：曾凡琮 徐劲力[2] ZENG Fan-cong;XU Jin-li(School of Mechanical,Electrical and Architectural Engineering,Jianghan University,Hubei Wuhan 430056,China;School of Mechanical and Electrical Engineering,Wuhan University of Technology,Hubei Wuhan 430070,China)

机构地区：[1]江汉大学机电与建筑工程学院,湖北武汉430056 [2]武汉理工大学机电工程学院,湖北武汉430070

出　　处：《机械设计与制造》2023年第2期28-31,36,共5页Machinery Design & Manufacture

基　　金：国家工业与信息化部智能制造重点专项(政府收支分类:2159999,预算号:21507707999107);柳州市科技攻关项目(2018A0201e002)。

摘　　要：四冲程气动发动机(Four-Stroke Compressed Air Engine;F-s CAE)气缸内气体状态的变化规律直接影响其动态特性,文中首先阐述了F-s CAE的工作原理,并运用工程热力学理论建立了F-s CAE工作过程的数学模型。以F-s CAE的气缸为研究对象,基于Fluent分别建立了其物理模型和动网格模型,对气缸内流场进行了动态数值模拟,得到了缸内流域的压力场和温度场的动态变化。为验证计算流体动力学(Computational Fluid Dynamics,CFD)仿真方法的正确性,将CFD仿真结果与理论数值分析结果进行对比。研究结果表明,运用CFD仿真方法来研究F-s CAE气缸内的流场特性是可靠且可行的,能较准确的反映其工作特性,为F-s CAE的研发标定和进一步的优化设计提供理论支撑。The changing law of gas state in cylinder ofFour-Stroke Compressed Air Engine(F-s CAE)directly affects its dynamic characteristics.The working principle of F-s CAE is described in this paper,and the mathematical model is established by using the theory of engineering thermodynamics.Taking the engine cylinder as the research object,the physical model and the dynamic grid model are established based on Fluent respectively,and the flow field in the cylinder is dynamically simulated by numerical simulation,the dynamic changes of pressure field and temperature field inside the cylinder are obtained.To verify the correctness of CFD simulation method,CFD simulation results are compared with theoretical numerical analysis results.The research results show that CFD simulation method is reliable and feasible to study the flow field characteristics in the cylinder of Fs CAE,which can reflect its working characteristics more accurately and provide theoretical support for the research and calibration of F-s CAE and further optimization design.

关 键 词：四冲程气动发动机 FLUENT 动网格模型 流场特性 CFD 

分 类 号：TH16[机械工程—机械制造及自动化] TH138