Abstract
This paper presents the performance of biodiesel blends in a single-cylinder water-cooled diesel engine. All experiments were carried out at constant speed 1500 rpm and the biodiesel blends were varied from B10 to B100. The engine was equipped with variable compressions ratio (VCR) mechanism. For 100% Jatropha biodiesel, the maximum fuel consumption was 15% higher than that of diesel fuel. The brake thermal efficiency for biodiesel and its blends was found to be slightly higher than that of diesel at various load conditions. The increase in specific fuel consumption ranged from 2.75% to 15% for B10 to B100 fuels. The exhaust gas temperature increased with increased biodiesel blend. The highest exhaust gas temperature observed was 430°C with biodiesel for load conditions 1.5 kW, 2.5 kW, and 3.5 kW, where as for diesel the maximum exhaust gas temperature was 440°C. The CO2emission from the biodiesel fuelled engine was higher by 25% than diesel fuel at full load. The CO emissions were lower with Jatropha by 15%, 13%, and 13% at 1.5 kW, 2.5 kW, and 3.5 kW load conditions, respectively. TheNOxemissions were higher by 16%, 19%, and 20% at 1.5 kW, 2.5 kW, and 3.5 kW than that of the diesel, respectively.
Highlights
Diesel engines have provided power units for road transportation systems, ships, railway locomotives, equipment used for farming, construction, and in almost every type of industry due to its fuel efficiency and durability
Single-cylinder diesel engine requires no modification in hardware during testing
(i) Improvement in brake thermal efficiency (BTE) and brake specific fuel consumption (BSFC) was observed at higher compressions ratio 19.5 as compared to 17.5 at all blends
Summary
Diesel engines have provided power units for road transportation systems, ships, railway locomotives, equipment used for farming, construction, and in almost every type of industry due to its fuel efficiency and durability. Diesel engines are the major sources of NOx and particulate matter emissions which are environmental concerns. National governments are imposing stringent emissions on automotive sector to reduce NOx and PM emissions. The stringent emission regulation requirements give a major challenge to comply emission targets while maintaining its performance, drivability, durability, and fuel economy. Successful alternative fuel should fulfill environmental and energy security needs without sacrificing engine operating performance [1]. Of the nonedible type can be used as fuel in diesel engines. They contain significant amount of oxygen [2, 3]. The idea of using vegetable oils as fuel for diesel engine is not new. When Rudolf diesel invented diesel engine and demonstrated in the 1900 world exhibition in Paris, using peanut oil and presented that “The use of vegetable oils for engine fuels may seem insignificant today, but such oils may become in course of time as important as petroleum and coal tar products of present times” [4]
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