Effects of multiple uniformity split injection strategies on combustion and exhaust emission characteristics in a single-cylinder diesel engine
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This study focuses on analyzing the effects of multiple uniformity split injection strategies on combustion and exhaust emission characteristics under idle conditions in a single-cylinder diesel engine. The multiple uniformity split injection strategies were divided into double, triple, quadruple, and quintuple injections. In addition, the combustion and exhaust emission characteristics were compared with a single injection strategy. Combustion characteristics, such as maximum in-cylinder pressure, maximum rate of heat release (ROHR), maximum rate of pressure rise (ROPR), and maximum in-cylinder temperature, were all shown to have decreased as the number of split injections increased, compared with those for a single injection strategy. The indicated mean effective pressure (IMEP) and engine torque representing the engine performance were lowest for double injection, compared to single injection. The coefficient of variation of the IMEP (COVIMEP), which is the representative index of combustion stability, was lowest under quadruple injection conditions. In all multiple uniformity split injection conditions, NOx emission levels were reduced by up to 83.9% owing to a suppression of the rate of heat release and low temperature combustion. The CO2 emission levels were also lower, whereas the CO and HC emission levels were higher compared to the single injection strategy. However, the CO2, CO, and HC levels all increased with increasing evenly divided injections.
Abstract
This study focuses on analyzing the effects of multiple uniformity split injection strategies on combustion and exhaust emission characteristics under idle conditions in a single-cylinder diesel engine. The multiple uniformity split injection strategies were divided into double, triple, quadruple, and quintuple injections. In addition, the combustion and exhaust emission characteristics were compared with a single injection strategy. Combustion characteristics, such as maximum in-cylinder pressure, maximum rate of heat release (ROHR), maximum rate of pressure rise (ROPR), and maximum in-cylinder temperature, were all shown to have decreased as the number of split injections increased, compared with those for a single injection strategy. The indicated mean effective pressure (IMEP) and engine torque representing the engine performance were lowest for double injection, compared to single injection. The coefficient of variation of the IMEP (COVIMEP), which is the representative index of combustion stability, was lowest under quadruple injection conditions. In all multiple uniformity split injection conditions, NOx emission levels were reduced by up to 83.9% owing to a suppression of the rate of heat release and low temperature combustion. The CO2 emission levels were also lower, whereas the CO and HC emission levels were higher compared to the single injection strategy. However, the CO2, CO, and HC levels all increased with increasing evenly divided injections.
참고문헌 (16)
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