Premnath S, Devaradjane G
Automobile Engineering, Sri Venkateswara College of Engineering, Sriperumbudur 602117, India.
Automobile Engineering, MIT Campus, Anna University, Chennai 600044, India.
Ecotoxicol Environ Saf. 2015 Nov;121:10-5. doi: 10.1016/j.ecoenv.2015.07.033. Epub 2015 Aug 6.
The emissions from the Compression ignition (CI) engines introduce toxicity to the atmosphere. The undesirable carbon deposits from these engines are realized in the nearby static or dynamic systems such as vehicles, inhabitants, etc. The objective of this research work is to improve the performance and emission characteristics of a diesel engine in the modified re-entrant combustion chamber using a diesel and Jatropha methyl ester blend (J20) at three different injection pressures. From the literature, it is revealed that the shape of the combustion chamber and the fuel injection pressure have an impact on the performance and emission parameters of the CI engine. In this work, a re-entrant combustion chamber with three different fuel injection pressures (200, 220 and 240bars) has been used in the place of the conventional hemispherical combustion chamber for diesel and J20. From the experimental results, it is found that the re-entrant chamber improves the brake thermal efficiency of diesel and J20 in all the tested conditions. It is also found that the 20% blend of Jatropha methyl ester showed 4% improvement in the brake thermal efficiency in the re-entrant chamber at the maximum injection pressure. Environmental safety directly relates to the reduction in the undesirable effects on both living and non-living things. Currently environmental pollution is of major concern. Even with the stringent emission norms new methods are required to reduce the harmful effects from automobiles. The toxicity of carbon monoxide (CO) is well known. In the re-entrant combustion chamber, the amount of CO emission is reduced by 26% when compared with the conventional fuel operation of the engine. Moreover, the amount of smoke is reduced by 24% and hydrocarbons (HC) emission by 24%. Thus, the modified re-entrant combustion chamber reduces harmful pollutants such as unburned HC and CO as well as toxic smoke emissions.
压燃式（CI）发动机的排放给大气带来了毒性。这些发动机产生的不良碳沉积物会在附近的静态或动态系统中出现，比如车辆、居民等。本研究工作的目的是在改进的再入式燃烧室中，使用柴油和麻风树甲酯混合燃料（J20），在三种不同的喷射压力下，提高柴油发动机的性能和排放特性。从文献中可知，燃烧室的形状和燃料喷射压力会对CI发动机的性能和排放参数产生影响。在这项工作中，用一个具有三种不同燃料喷射压力（200、220和240巴）的再入式燃烧室取代了用于柴油和J20的传统半球形燃烧室。从实验结果来看，发现在所有测试条件下，再入式燃烧室提高了柴油和J20的制动热效率。还发现，在最大喷射压力下，20%的麻风树甲酯混合燃料在再入式燃烧室中的制动热效率提高了4%。环境安全直接关系到减少对生物和非生物的不良影响。目前，环境污染是主要关注点。即使有严格的排放标准，仍需要新的方法来减少汽车产生的有害影响。一氧化碳（CO）的毒性是众所周知的。在再入式燃烧室中，与发动机的传统燃料运行相比，CO排放量减少了26%。此外，烟雾量减少了24%，碳氢化合物（HC）排放量减少了24%。因此，改进后的再入式燃烧室减少了未燃烧的HC和CO等有害污染物以及有毒烟雾排放。
