This paper describes the development of a natural gas engine with a prechamber. The comparison between a conventional gas engine and the engine with the prechamber is given. The testing results show that the new combustion system is reliable and practical. The performance of the engine, compared to the conventional gas engine, is greatly improved due to stable ignition and quick flame propagation in the prechamber and a high burning rate and short burning period in main chamber. The analyses of the combustion processes and lean combustion potential in the engine are further discussed.

This paper reports the development of a new prechamber combustion system of the 2190T natural gas engine. The experimental results show that the new combustion system is reliable and practical, and that the performance of the engine is greatly improved due to stable ignition and fast flame propagation in prechamber and high burning rate and short burning period in main chamber.

提出了一种适合于车用涡轮增压柴油机实时仿真的压气机特性计算方法，应用方便，计算时间少。对一台6缸增压柴油机压气机特性的实例计算表明，此方法具有较好的计算精度。

近十年来, 由于能源和环保的要求, 火花点火天然气发动机以高效、低污染燃烧的优点正在迅速发展。为了分析和研究这种发动机的燃烧过程, 预测多种参数变化对性能的影响, 建立了火花点火式天然气发动机的准维燃烧模型。根据倒拖发动机的实验结果, 对缸内紊流的衰减和产生进行了模化, 提出了缸内紊流强度计算的方法。试验表明, 模型的计算值和试验值具有很好的一致性。该模型计算精度高、工程应用方便, 为缸内燃烧过程分析、性能预测提供了一种有效的工具。

Spark ignition natural gas engines with prechamber, having high thermal efficiency and low exhaust emissions, have been developed due to energy resouces and air pollution problems in recent ten years. A lot of significant results on experiment have been given, but the reports on combustion model were few seen so far. This paper discribles a quasidimensional combustion model for the engines with prechamber. A simulation method for calculating turbulent intensity in cylinder and a submodel for jet orifices between two chambers are put forword. It showed by testing that calculated data showed good general agreement with the correspanding experimental values.