Numerical Investigation on Performance and Emission Characteristics of a Diesel Engine Fired With Methanol Blended Diesel Fuel

Abstract

The effects of methanol and oleic acid blended diesel fuel on the performance and emissions of the diesel engine are evaluated numerically by commercial software Diesel-RK to simulate a single cylinder, naturally aspirated, direct injection, four-stroke diesel engine. The present study also resolves the problem of the immiscibility of methanol in diesel fuel, as to avoid immiscible nature an optimum percentage of oleic acid and n-butanol is added to make blends stable. The methanol blended diesel fuels are 7%, 12%, and 17% methanol in volume basis (D85M7NB1O7, D75M12NB1O12, and D65M17NB1O17). A drastic reduction in NOx emission is observed due to low combustion temperature however the PM emissions increases which can be controlled by using exhaust after-treatment techniques. The results indicate that: the brake specific fuel consumption increases and brake thermal efficiency decreases with an increase of methanol, oleic acid and n-butanol contents in the blended fuel whereas maximum heat release rate increases and exhaust temperature decreases.

Use of diesel and emulsified diesel in CI engine: A comparative analysis of engine characteristics

“…It can be observed that the contents of HC are considerably higher for WED than that of neat diesel. The main reason for such a trend is the micro explosion as the highest content of HC emissions are observed in the case of 10% WED. 26 , 38 Moreover, as the load is increased, the HC emissions increase due to less availability of oxygen for complete combustion caused by the lowest air-fuel ratio at maximum loads. Similarly, the content of CO (shown in Figure 6 ) is also increasing with the increasing percentage of water in diesel and high load conditions due to decreased combustion temperature and lack of air respectively.…”

“…Similarly, the content of CO (shown in Figure 6 ) is also increasing with the increasing percentage of water in diesel and high load conditions due to decreased combustion temperature and lack of air respectively. 26 …”

“…Youngtaig observed an increased BSFC with water emulsified diesel as compared to pure diesel which was attributed to zero calorific value of water which reduces the heating value. 23 Al-Sabagh et al, 24 Scarpete, 25 and Singh and Bharj 26 also agree that the level of NOx emission is decreased in a considerable amount on adding water content to petroleum diesel. Therefore, the use of water emulsion in a diesel engine is an economical way to reduce emissions as no engine design modification is needed to control the production of the pollutants.…”

“…Similarly, the content of CO (shown in Figure 6) is also increasing with the increasing percentage of water in diesel and high load conditions due to decreased combustion temperature and lack of air respectively. 26 However, the variation in the content of CO and HC in the case of water emulsified diesel depends on the combined effect of improved combustion by microexplosion of water and decreased combustion temperature. 28 Therefore, in contrast to the results of the current study, Hegde et al 41 observed a decrease in the emissions of HC and CO while Ithnin et al 11 reported an increase in these contents in case of water-diesel emulsions.…”

Nanoparticles as Additive to the Diesel and Biodiesel along with Blends: A Review on Emission Characteristics and Performance of CI Engine

“…In water emulsified diesel the different concentration (0, 50, 100, & 150 ppm) of carbon nano tubes were used. The researcher found BSFC as 0.3 kg/kW h, 0.3 kg/kW h, 0.27 kg/kW h and 0.27 kg/kW h, BTE as 28.6%, 28.9%, 30%, and 30.5% [89]. The 30%, 30.5%, 13.6% and 32% change in break thermal efficiency was observed with the 0, 5, 10, 15 ppm concentration of cerium zirconium mixed oxide with jatropha-diesel blend oil [90,91].…”