Effects of ambient temperature and injection pressure on biodiesel ignition delay

Abstract

Biodiesels are promoted as alternative fuels due to their potential to reduce dependency on fossil fuels. The main problem in diesel combustion chamber design is to understand the importance of interaction phenomenon between fuel spray and surrounding gas prior to ignition. Rapid compression machine (RCM) is widely used to acquire experimental insights into fuel autoignition at conditions relevant to the current and future combustion technologies. An experimental study of the measurement of ignition delay characteristics of diesel and blended biodiesel fuels in the RCM was carried out. The objective of this study is to investigate the effects of various ambient temperature, Ti and injection pressure, Pinj on ignition delay with different fuels used. This present study used the ignition delay of 5vol%, 10vol%, and 15vol% blending of palm oil methyl ester with a standard diesel as fuels in diesel engines called as B5, B10, and B15. The diesel fuel was blended with the biodiesel fuels at different fuel mixture blends. The injection pressure chosen was from 80 MPa to 140 MPa while an ambient temperature of RCM varied from 750 K to 950 K. The results showed that for all tested fuels, the reduction in ignition delay increased with the increase in ambient temperature and injection pressure. The palm oil biodiesel had higher density, viscosity, and cetane number, facilitated the shortest ignition delay when compared to the diesel fuel under all ambient temperatures and injection pressures. The fuel oxygen content in the biodiesel fuel also played a greater role in decreasing the ignition delay.

Analysis of castel type biomass combustion chamber using candlenut shell fuel for patchouli oil purifying

“…this condition will inevitably result from the quality of combustion products used in the evaporation process of patchouli leaf distillation and also the temperature will be decreased while the desired are with high temperature but always constant. As related to this temperature has also been obtained by norrizam jaat that the constant the temperature the better the results obtained [44]. From the average data that has been obtained above then processed into a graph showing the average work of combustion during the distillation process as shown in Figure 4 below.…”

Analysis of hydrogen enriched treble biofuel blended with diesel for performance, emission and combustion characteristics on CI engine

“…The slight variations in the thermal efficiency of the biodiesel blends were mainly due to the lower calorific value of WCOBD and PSBD when compared with diesel [16,17]. Furthermore, the higher viscosity and slow vaporisation of biodiesel present in these blends led to inferior combustion of biodiesel which caused the brake thermal efficiency to be low [18][19][20] . BTE was lower for B10 and increased with the blending ratio of B20, thereafter, it fell with further increase to B30.…”

“…Features like higher cetane number than diesel and less sulphur and more oxygen, are environmentally friendly and can reduce HC and CO in the exhaust gas. For these reasons, different studies have been conducted on biodiesel blended with diesel and the results show that emission concentration varies and depends on biodiesel source and engine condition [14,20,29]. Hydrogen possesses many superior combustion and emission characteristics than other liquid or gas fuels.…”

Effect of inlet air temperature on SI engine fueled with diethyl ether-gasoline blends

“…Jaat et al [7] experimentally established a reduction in ignition delay with increase in ambient temperature of biodiesel blends and its oxygen content did play a significant role. It was established that leaning effect in oxygenated blends such as with ethanol decreases CO and HC emissions in gasoline engines [8,9].…”