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Improvement of performance and exhaust emission characteristics in gas engine by heat release control
Institution:1. Universidade Estadual do Sudoeste da Bahia, Laboratório de Química Analítica, Jequié, Bahia State 45206-190, Brazil;2. Universidade Federal da Bahia, Grupo de Pesquisa em Química e Quimiometria, Instituto de Química, Salvador, Bahia CEP 40170-270, Brazil
Abstract:By either multiple direct injections coupled with an individual ignition or multiple ignitions in a premixed charge, the combustion process can positively be changed. The experimental results show that the heat release rate is changed widely depending on the flame ignition timing, and the possibility to bring about a preferable combustion could be shown. Numerical simulations of the cycle performance are carried out using a specially developed numerical simulator, involving the multi-zone combustion models. The results of the calculation using the multi-zone model show that a significant amount of NOx appears in the zone formed in the early combustion stage.
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