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

In a constant volume combustion chamber combined with high pressure common rail system, the ignition, combustion and soot formation characteristics of diesel were studied at different injection pressures keeping injection pulse width or fuel injection volume constant. The change range of injection pressure was 40~160MPa, which was commonly used in high pressure common rail diesel engine under middle and high loads. The experiments were conducted by using a highspeed photography technology and a combustion pressure acquisition system. The soot formation characteristic was studied by natural flame luminosity. Results show that, keeping injection pulse width or fuel injection volume the same, the test results have the same change trend: with the increase of injection pressure, the flame luminosity becomes weaker; the ignition region becomes larger; and the flame liftoff length becomes longer. In addition, the combustion pressure rise rate would increase. Also, the moment that pressure begins to rise and the moment that the maximum combustion pressure occurs are both advanced. At the same time, the heat release rate reaches peak more quickly and the peak value increases gradually. Keeping the volume of injected fuel unchanged, with the increase of injection pressure from 80MPa to 160MPa, the ignition delay is shortened from 1.7ms to 1.4ms; the combustion duration is shortened from 6.9ms to 4.7ms; and the soot formation is reduced significantly. However, such trend is weakened with the increase of the injection pressure.