ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

A four-stroke free-piston engine was simulated and tested to achieve energy conversion from fuel to electricity. Simulation models were created based on the kinetic equation of free-piston, the equation of gas state, and an equivalent heat release rate of combustion process. Dynamic properties of the system were analyzed by using the model. Effects of the compression ratio and the expansion ratio were discussed. Based on the results of the simulation, an experimental prototype was fabricated. Testing results of the prototype were analyzed, and performance parameters were given out in detail. The generating efficiency 34% was obtained up to now, and the efficiency 45% was available after optimization. According to the simulated and tested results, the new generating system has distinct advantages to conventional gasoline generators.