DME-methanol fueled RCCI engine testing and development

压缩点火发动机由于高压缩比而提供了上级热效率。这 转化为更好的燃油经济性和更低的二氧化碳排放。传统柴油机的缺点 直接喷射在气缸中产生富燃料区，导致产生 颗粒物（烟灰）和产生高NOx水平的贫高温区。双燃料发动机， 在更均匀的条件下运行并产生更低的燃烧温度， 问题.该项目将涉及开发和测试压燃式双燃料发动机， 二甲醚作为反应性引燃燃料，甲醇作为主燃料。这两种燃料都是清洁燃料 并且可以从天然气或生物质中获得。其中一个关键问题是点火时间为这一点 新的燃料组合。点火正时可以在操作期间经由喷射正时改变， 产生最佳效率。然而，需要更好地理解缸内的建模 燃烧过程同时研究二甲醚喷雾模式和点火将是 在激波管中进行。该激波管将被用来调节甲醇-空气到典型的发动机 在激波管末端的温度和压力条件。在此期间，二甲醚将 喷射到混合物中，喷射模式和点火将使用高速视频记录。

Compression ignition engines provide superior thermal efficiency because of the high compression ratio. This translates into better fuel economy and lower carbon dioxide emissions. The drawback of traditional diesel engines is that direct injection produces fuel-rich zones in the cylinder that result in the production of particulate matter (soot) and lean high-temperature zones that produce high NOx levels. Dual fuel engines that operate under more homogeneous conditions and produce lower combustion temperature circumvent this problem. The project will involve developing and testing a compression ignition dual fuel engine using dimethyl ether as the reactive pilot fuel and methanol as the primary fuel. Both these fuels are cleaner burning than diesel and can be derived from natural gas or biomass. One of the key issues is the ignition timing for this new combination of fuels. The ignition timing can be varied during operation via the injection timing to produce optimum efficiency. However, a better understanding is required for modeling of the in-cylinder combustion process. A simultaneous study looking at dimethyl ether spray pattern and ignition will be performed in a shock tube. The shock tube will be used to condition the methanol-air to typical engine temperature and pressure conditions at the end of the shock tube. During this time dimethyl ether will be sprayed into the mixture and the spray pattern and ignition will be recorded using high-speed video.