预燃室式火花点火天然气发动机燃烧模型

A Model for a SI Natural Gas Engine with Prechamber

由于全球能源和环保的要求，预燃室式火花点火天然气发动机近十年来得到迅速发展。在实验研究方面已经取得很大进展，但是在燃烧模型方面，目前尚未见到有报道。本文根据主、副燃烧室中气体流动过程的质量和能量的交换关系，建立了预燃室式火花点火天然气发动机的燃烧模型，根据实验结果，提出了缸内紊流强度的模拟方法和喷孔边界模型。台架试验结果表明，计算值与实验值吻合较好。为发动机燃烧过程分析、性能预测提供了一种有效的工具。

Spark ignition natural gas engines with prechamber,which have obvious advantages of both high thermal efficiency and low exhaust emissions,have been increasingly developed due to energy resources and serious air pollution problems in recent ten years.A lot of significant results on experiment have been given,but the reports on combustion model have been few seen so far.This paper describes a quasidimensional combustion model for SI natural gas engines with prechamber.A simulation method for calculating turbulent intensity in cylinder and a submodelling for jet orifices between two chambers are put forward.It is showed by testing that the calculated data show good general agreement with the corresponding experimental values.