分会场

高效清洁燃烧

摘要

The chemical kinetics model studies have been conducted in this paper to assess ignition characteristics of coal-based naphtha (with carbon range C3-C10, RON of 54) for use in advanced engines. Reactivity of coal-based naphtha (CBN) were compared with two surrogate models: PRF54 (46 mole% n-heptane/ 54 mole% iso-octane) model and 3-component (42.561 mole% NC7H16, 43.683 mole% IC8H18 and 13.756 mole% IC6H14) model. Both two models reasonably predicted the ignition delay times (IDTs) of CBN at 10, 15 bar and 640-900 K. In addition, the experimental (LUPOE research engine) and simulation (Chemkin-PRO) study of coal-based naphtha HCCI combustion was carried out. The results show that the combustion process of coal-based naphtha is sensitive to the intake temperature, intake temperature. With the increase of intake temperature and equivalent ratio, the combustion phase of HCCI is obviously advanced, the peak value of in-cylinder pressure and heat release rate (HRR) increases, and the corresponding phase is also obviously advanced. It should be pointed out that when the intake temperature is high or mixture is rich, the coal-based naphtha HCCI engine is prone to knock, and the peak phase will appear before top dead center (TDC). This phenomenon is especially obvious when the intake temperature is very high. It can be seen that the coal-based naphtha is suitable for low-temperature lean combustion.

关键词

naphtha;HCCI;optical engine;modelling

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