工程设计学报2025，Vol.32Issue(1)：132-140,封3,10.DOI:10.3785/j.issn.1006-754X.2025.01.119
基于动网格技术的双进/排气活塞式膨胀机动力性能研究
Research on dynamic performance of double inlet/exhaust piston expander based on dynamic grid technology
摘要
Abstract
The distributions of pressure field,temperature field and velocity field of gas in cylinder of the piston expander are difficult to obtain by traditional analytical methods.Therefore,the dynamic performance of the double inlet/exhaust piston expander was studied based on the dynamic grid technology of CFD(computational fluid dynamics).Firstly,the unsteady flow of gas in the cylinder of the double inlet/exhaust piston expander was simulated numerically,and the transient distributions of the pressure field,temperature field and velocity field were obtained.Secondly,the output power test platform of the expander was built,and the simulation values and test values of the output power under multiple working conditions were compared.The error between the two was less than 5.5%,which verified the correctness of the simulation method.Finally,the influences of inlet pressure and inlet temperature on the dynamic performance of expander were analyzed through orthogonal experiment.The results showed that after the compressed air entered the expansion cylinder,the temperature of gas increased rapidly at first,and then decreased continuously after the crankshaft angle was 15°.After opening the exhaust valve,the pressure of gas in the cylinder was higher than the ambient pressure and the residual pressure energy could be recovered.Increasing the inlet temperature could effectively improve the dynamic performance of the expander.When the inlet pressure was 0.5 MPa and the inlet temperature increased from 273 K to 333 K,the output power of the expander increased by 19.8%and the gas energy utilization rate increased by 18.3%.Increasing the inlet pressure,the output power of the expander gradually increased,and the gas energy utilization rate gradually decreased.When the inlet temperature was 273 K,and the inlet pressure increased from 0.5 MPa to 2 MPa,the output power of the expander increased from 0.81 kW to 3.76 kW,and the gas energy utilization rate decreased by 15.3%.The research results provide a theoretical basis for the performance optimization of piston expander.关键词
活塞式膨胀机/计算流体动力学/动网格技术/流场/正交试验Key words
piston expander/computational fluid dynamics(CFD)/dynamic grid technology/flow field/orthogonal experiment分类
机械制造引用本文复制引用
虞启辉,耿延歧,张立从..基于动网格技术的双进/排气活塞式膨胀机动力性能研究[J].工程设计学报,2025,32(1):132-140,封3,10.基金项目
国家自然科学基金资助项目(52465008) （52465008）
