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 direct injection compression ignition engine (CIE) with dual injection systems, the performance tests and the combustion analysis at varied ethanol injection timing were performed respectively, which with ethanol as the main fuel injected by one injection system and diesel fuel as the igniting fuel injected by another injection system. The test results show that with the igniting fuel injected at 21°CA BTDC, the ethanol fuel injection timing can be earlier than the ignition fuel injection timing. The fuel economy of dual-fuel CIE approaches to that of the baseline diesel engine when the ethanol fuel injection timing is 25°CA BTDC. The maximal power output corresponding to the ethanol injection timing is 29°CA BTDC. The maximum statistical in-cylinder combustion pressure of test engine decreases with the advance of the ethanol injection timing at light load conditions, but it increases with the injection advance at heavy load conditions. The combustion pressure standard deviation increases with the advance of the ethanol injection timing, and correspondingly, the engine operation becomes more and more unsteady. When the ethanol injection timing is advanced to 31° CA BTDC, the injected igniting diesel fuel can not ignite the main ethanol fuel reliably.