Abstract

An alarming adulteration of nature with automotive tail pipe emissions causing global warming demands suitable engine modification. Further use of alternative renewable fuels with fine-tuning the engine and required modifications could reduce the diesel engine emissions. Oxygenated fuels (such as methanol, ethanol and Butanol) act as stand-in fuel that could enrich the global energy requisites and affirmatively downsize the emissions by accelerating combustion efficiency. Under this circumstance, the experimental analysis was done on a single-cylinder four-stroke DI CI engine using conventional diesel as fuel by injection of ethanol, diethyl ether (DEE) and Butanol independently to into intake manifold at three injection timings viz., TDC, 5°ATDC and 10°ATDC respectively under the constant 27°CA injection duration with the help of a distinct setup comprises of the electronic control unit (ECU) and injector system. The resolutions drawn from the recorded results at 80% load during experimentation summarized that DEE exhibited improved BTE of 2.5% and 1% and reduced smoke emissions of 12.54% and 10.6% compared to that obtained with ethanol and Butanol, respectively. On the other hand, DEE emitted excessive NO_x and inferior HC, CO emissions compared to ethanol and Butanol apart from shortened ignition delay and combustion duration. The conclusions are drawn from the injection of oxygenates that apart from the perspective of performance, DEE injection at the 5°ATDC was noticed to be optimal at 27°CA injection duration (3 ms) too for emissions characteristics of a diesel engine.

摘要

令人震惊的自然掺假与汽车尾气排放导致全球变暖，需要对发动机进行适当的改装。进一步使用可替代的可再生燃料，对发动机进行微调和必要的改造，可以减少柴油发动机的排放。含氧燃料（如甲醇、乙醇和丁醇）作为替代燃料，可以丰富全球能源需求，并通过提高燃烧效率肯定地减少排放。在此情况下，对单缸四冲程直喷直喷发动机进行了实验分析，该发动机以传统柴油为燃料，分别在 TDC 三个喷射正时将乙醇、二乙醚 (DEE) 和丁醇喷射到进气歧管中, 在由电子控制单元 (ECU) 和喷油器系统组成的独特设置的帮助下，在恒定 27°CA 喷射持续时间下分别为 5°ATDC 和 10°ATDC。从实验期间在 80% 负载下记录的结果得出的分辨率总结说，与使用乙醇和丁醇获得的结果相比，DEE 分别提高了 2.5% 和 1% 的 BTE，并减少了 12.54% 和 10.6% 的烟气排放。另一方面，DEE 排放过多的 NO_x和较差的 HC、CO 排放，与乙醇和丁醇相比，除了缩短的点火延迟和燃烧持续时间。从含氧化合物的喷射得出的结论是，除了性能的角度，在 5°ATDC 时的 DEE 喷射被认为在 27°CA 喷射持续时间（3 毫秒）时对于柴油发动机的排放特性也是最佳的。