Effect of key parameters on knock suppression in a two-stroke spark ignition engine with aviation kerosene fuel

Abstract

This research work studies the impact of the mixture concentration, spark timing, and ignition energy on the knock suppression of a two-stroke spark ignition aviation kerosene-fueled engine. Bench tests on different working conditions were conducted and some related data including in-cylinder pressure, cylinder head temperature, exhaust temperature, engine power, and torque were collected to analyze the influence of different control parameters on the knock characteristics of the engine. The results show that the knock can be suppressed at leaner and richer (than the stoichiometric) mixtures, and the richer mixture has a more obvious effect on suppressing knock. Retarding the ignition advanced angle will reduce the knock intensity but will make the exhausted temperature exceed and the output power decrease. The use of a rich mixture with early spark timing has a better effect on the knock suppression as compared to the use of a lean mixture with late spark timing. Reducing the ignition energy can suppress the knock slightly, but experimental results show that it is not an effective way.