Some aspects of cycle variability at the Diesel engine fuelled with animal fats

Abstract

The progressive diminution of the oil reserves all over the world highlights the necessity of using alternative fuels derived from durable renewable resource. The use of the alternative fuels represents a viable solution to reduce the pollutant emissions and to replace fossil fuels. Thus, a viable solution is the use of the animal fats in mixture with the diesel fuel at the diesel engines. A D2156 MTN8 diesel engine was firstly fuelled with diesel fuel and then with different blends of diesel fuel-animal fats (5% and 10% animal fats content). In the paper are presented some results of the experimental investigations of engine fuelled with preheated animal fats. The raw animal fats effects on the combustion process and on the pollutant emissions at different engine loads and 1450 rev/min engine speed are showed. The engine cycle variability increases at the animal fats content increase. The cycle variability for maximum pressure, maximum pressure angle and indicated mean effective pressure is analysed. The cycle variability coefficients values don’t exceed the recommended values of the standard diesel engine.

An experimental investigation of the performance, emission and combustion stability of compression ignition engine powered by diesel and ammonia solution (NH4OH)

“…It can be concluded that the test engine worked correctly under all analysed conditions and did not exceed the permissible stability indices for internal combustion reciprocating engines. According to Nicolici et al, 39 the acceptable COV pmax limit for internal combustion engines is 10% and is equal to the limit that is acceptable until recently for COV IMEP . 40 Currently, the COV IMEP limit for internal combustion engines defined by Heywood is 5%.…”