| 施东晓,郭立新,姚春德,等.基于多缸运动的气体机进气均匀性计算方法[J].内燃机工程,2021,42(5):8-13. |
| 基于多缸运动的气体机进气均匀性计算方法 |
| Calculation Method of Intake Uniformity of Gas Engine Based on Multi-cylinder Motion |
| DOI：10.13949/j.cnki.nrjgc.2021.05.002 |
| 关键词:天然气发动机 进气系统 均匀性 数值模拟 |
| Key Words:natural gas engine intake system uniformity numerical simulation |
| 基金项目: |
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| 摘要:各缸EGR率和进气量的均匀性是当量燃烧天然气发动机最关注的两个问题。常规EGR率均匀性计算方法以各缸的进气道作为计算域的出口边界，存在当采用出口质量流量边界时各缸进气量为既定值的问题，故此方法只适用于各缸EGR率的分析，不适用于各缸进气量的分析。为解决计算各缸进气量的难题，本文建立了考虑多缸气门和活塞运动的计算方法，不仅能够直接求解各缸的进气量、当量比，还能获得涡流比、滚流比和湍动能等描述缸内流动状态的参数。丰富了评价进气均匀性的参数，拓展了计算能力。最后采用上述方法分析了某国VI天然气发动机的进气均匀性。 |
| Abstract:The uniformity of EGR rate and intake quantity of each cylinder are the two most concerned problems of natural gas engine under stoichiometric combustion mode. For the conventional calculation method of EGR rate uniformity, the inlet ports of each cylinder are taken as the outlet boundary of calculation fluid domain. However, the intake quantity of each cylinder is a given value when the outlet mass flow boundary is adopted. Therefore, this method is only applicable to the analysis of EGR rate of each cylinder, not to the analysis of intake quantity of each cylinder. In order to solve the problem of calculating the intake quantity of each cylinder, a calcula-tion method considering the movement of multi-cylinder valves and pistons was established in this paper, which can not only directly calculate the intake quantity and equivalent ratio of each cylinder, but also obtain the parameters describing the flow state in the cylin-der such as vortex ratio, tumble ratio and turbulent kinetic. Moreover, this method enriches the parameters for evaluating the intake uniformity and expands the calculation ability. Finally, the intake uniformity of a China VI natural gas engine was analyzed by the above method. |
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