No abstract

No abstract

Biodiesels are alternative fuels for petroleum-based diesel without major modifications of engine. In the environmental aspect, also biodiesel gives fewer pollutants than petroleum diesel. However, the NO x level is slightly higher. To reduce NO x , some of the methods are being used, which include direct injection, turbocharging, air-to-air intercooling, combustion optimization with and without swirl support, multivalve cylinder head, advanced high pressure injection system, i.e., split injection or rate shaping, and electronic management system. However, technologies such as exhaust gas recirculation ͑EGR͒, soot traps, and exhaust gas after treatment are gaining emphasis to cater to the challenges posed by increasingly stringent environmental emission legislations. In this work, experimentation was conducted on a single cylinder diesel engine with mahua methyl ester ͑MME͒ in the neat form along with the cooled EGR and performance, combustion pressure, and emission parameters are collected by using suitable instrumentation. Same experimentation was repeated for the petroleum diesel and a comparison was made to evaluate the applicability of MME along with EGR without major modifications. After the analysis of results, it was found that 5% EGR is recommendable with neat biodiesel ͑MME͒ run, and in most of the situations, it proved its merit over neat diesel run.

No abstract

Investigations are carried out to verify the performance and emission of a variable compression diesel engine operated with pure Neem oil Bio diesel (NeME), and pure Diesel at various compression ratios starting from 15:1, 17:1, 19:1 and 21:1 to compare the results at each compression ratio considering pure diesel as base line. The experiment has been conducted at fixed engine speed of 1500 rpm and engine tests have been conducted to get the comparative measures of Specific Fuel Consumption (SFC), Brake thermal efficiency (BTh) and emissions such as CO, CO 2 , HC, and NO to study the impact of pure NeME, with respect to Compression ratio and its implementation. A notable improvement in between NO and HC was observed maintaining a high thermal efficiency by a suitable combination of Neem biodiesel and compression ratio. The results of pure NeME operated under compression ratio 17:1 were found encouraging in all respects of performance and improved emission characteristics.