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

Zhenfeng ZHAO; Chuncun YU; Xuefei DONG; Lei WANG

doi:10.13224/j.cnki.jasp.20200370

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

Combustion, Heat and Mass Transfer | 更新时间：2025-04-07

- Research on mixture formation of two⁃stroke heavy fuel direct injection engine
- Journal of Aerospace Power Vol. 36, Issue 8, Pages: 1569-1577(2021)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：10.13224/j.cnki.jasp.20200370
  CLC：
- 稿件说明：
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Zhenfeng ZHAO, Chuncun YU, Xuefei DONG, et al. Research on mixture formation of two⁃stroke heavy fuel direct injection engine[J]. Journal of Aerospace Power, 2021, 36(8): 1569-1577.
DOI：

Zhenfeng ZHAO, Chuncun YU, Xuefei DONG, et al. Research on mixture formation of two⁃stroke heavy fuel direct injection engine[J]. Journal of Aerospace Power, 2021, 36(8): 1569-1577. DOI： 10.13224/j.cnki.jasp.20200370.

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。

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.

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references

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天津大学机械工程学院

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