Study on the ignition and the combustion control of combustible mixtures in the spherical confined vessel

球形密闭容器内可燃混合气的着火及燃烧控制研究

基本信息

批准号：
16560191
负责人：
ONO Shinsuke
金额：
$ 2.3万
依托单位：
The University of Kitakyushu, Faculty of Environmental Engineering
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2005
项目状态：
已结题

项目摘要

To develop a simulation model for a Diesel engine cycle using DME fuel, the fundamental tests were carried out with the spherical combustion vessel which was made experimentally. The vessel of 200mm diameter equipped with the multipoint ignition system which can vary the heat release rate in a vessel through altering a burning duration and a flame propagation pattern. Since the heat loss is primarily based on the flame-interference with vessel wall, the heat release rate directly affects the exhaust emission.The premixed combustion tests with a di-methyl ether-air mixture were carried out for different equivalence ratios and heat release patterns. The emissions of oxides of nitrogen(NOx) were measured and compared with the calculated results from the multi-zone combustion model. The results showed that the model was valid for estimation of NOx.On the basis of this model, diesel combustion processes with a direct injection of DME were analyzed by making use of the modified simulation model with 3-zone combustion model. The indicated pressure diagrams and the emissions of oxides of nitrogen from the practical 4 cycle diesel engine were used for the calculation with the modified simulation model. The test results have shown to be proper for estimating the change of NOx emission when the heat release rate is changed. In the simulation by inspecting with the various rates, the longer duration of high temperature in the heat release process resulted in the higher NOx emission. From the results of simulation, it has been shown to be able to improve the exhaust emission characteristics of the engine by controlling the heat release rate.

为了开发使用DME燃料的柴油发动机周期的模拟模型，使用实验进行的球形燃烧容器进行了基本测试。配备了多点点火系统的200mm直径的容器，该系统可以通过改变燃烧持续时间和火焰传播模式来改变容器中的热量。由于热量损失主要是基于与容器壁的火焰干扰，因此热量释放速率直接影响排气发射。用二甲基乙醚空气混合物进行了预混合的燃烧测试，以不同的等效比和热释放模式。测量了氮氧化物的排放，并将其与多区域燃烧模型的计算结果进行了比较。结果表明，该模型对于在该模型的基础上估算NOx。通过使用3区燃烧模型的改良模拟模型，通过使用改良的仿真模型来分析使用DME直接注入DME的柴油燃烧过程。使用改良的仿真模型，将来自实用4循环柴油发动机的氮氧化物的指示压力图和氮氧化物的排放用于计算。测试结果已证明适合估计热释放速率时NOx发射的变化。在模拟中，通过检查各种速率，热释放过程中高温的持续时间较长，导致NOX发射较高。从模拟的结果来看，它已被证明能够通过控制散热速率来改善发动机的排气发射特性。