Abstract
The influence of injection opening pressure (IOP) for 20% blend (B20) of cottonseed oil methyl ester and 15 liters per minute (lpm) of hydrogen dual fuel mode was investigated based on performance and emission characteristics of a single cylinder, four stroke, diesel engine with a rated power of 3.5 kW, rated compression ratio of 17.5 at a rated speed of 1500 rpm. The experiments were carried out at three different IOP of 200, 220 and 240 bar respectively. The results depict the maximum brake thermal efficiency, minimum brake specific fuel consumption, and lowest HC and CO and while the concentration of NOx slightly increased. It has been found that the combustion characteristics of cottonseed oil methyl ester and its diesel blends closely followed those of standard diesel. Present investigations revealed that IOP of 220 bars for 15 lpm hydrogen with B20 dual fuel mode is optimum compared to other blends of cottonseed biodiesel and hydrogen, but it causes higher levels of exhaust emissions.
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