二冲程重油直喷发动机混合气形成研究

赵振峰; 俞春存; 董雪飞; 王蕾

doi:10.13224/j.cnki.jasp.20200370

二冲程重油直喷发动机混合气形成研究

doi: 10.13224/j.cnki.jasp.20200370

1. 北京理工大学机械与车辆学院, 北京 100081;
2. 航天时代飞鸿技术有限公司航天时代飞鸿技术股份有限能源与动力技术研究室, 北京 100081

详细信息

作者简介:
赵振峰(1974-),男,副教授、博士生导师,博士,从事航空活塞发动机领域研究。

中图分类号: V234
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出版历程
- 收稿日期: 2020-09-03
- 刊出日期: 2021-08-28

Research on mixture formation of two-stroke heavy fuel direct injection engine

1. School of Mechanical Engineering, Being Institute of Technology, Beijing 100081, China;
2. Energy and Power Technology Research Department, Aerospace Times FeiHong Technology Company Limited, Beijing 100081, China

摘要

摘要: 针对航空煤油蒸发困难、二冲程发动机油耗高的问题，建立了二冲程重油直喷发动机的三维仿真模型，并通过试验验证了模型的准确性。在此基础上研究了发动机的换气及混合气形成过程。研究结果表明：推迟喷油在减少燃油短路时间的同时，避开了排气流量较大的自由排气阶段，可以提升燃油捕获率；提前喷油，利用废气的高温可以加快煤油的蒸发进程，并且喷油过晚会导致煤油蒸发不完全、油气混合不均。所研究发动机在下止点前80°曲轴转角开始喷油可以保证燃油蒸发和均匀混合的同时提升燃油的捕获率。此时发动机具有较高的指示功率和较低的燃油消耗率，分别为84.0 kW和360.3 g/kWh。该研究结果可以为二冲程重油直喷发动机的喷油参数优化提供理论支撑。
- 二冲程 /
- 直喷 /
- 航空煤油 /
- 混合气形成 /
- 计算流体动力学（CFD）仿真
Abstract: In view of the problems of difficulty in evaporation of aviation kerosene and high fuel consumption of two-stroke engines,a three-dimensional simulation model of a two-stroke direct injection engine fueled with aviation kerosene was established,and the accuracy of the model was verified through experiments. On this basis, scavenging and mixture formation process was studied. The research results showed that postponing fuel injection reduced the short-circuit time of fuel, and at the same time avoided the free exhaust phase with large exhaust mass flow, which can improve the fuel capture rate. Utilizing the high temperature of exhaust gas can speed up the evaporation process of kerosene. Injection too late could lead to incomplete evaporation and uneven mixture of fuel and fresh charge. For this engine,80° before bottom dead center indicated an appropriate injection timing enabling fuel evaporation and uniform mixing while increasing the fuel capture rate. At this time, the engine had higher indicated power and lower indicated thermal efficiency, which were 84. 0 kW and 360. 3 g/kWh, respectively. The research results can provide theoretical support for the optimization of the fuel injection parameters of the two-stroke direct injection engine.
- two-stroke /
- direct injection /
- aviation kerosene /
- mixture formation /
- computational fluid dynamics (CFD) simulation

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参考文献(19)

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