Influence of Injection Strategy on Combustion and Emissions of Multi-point Injection Natural Gas Engine

doi:10.7652/xjtuxb202202006

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Influence of Injection Strategy on Combustion and Emissions of Multi-point Injection Natural Gas Engine

更新时间：2025-05-08

- Influence of Injection Strategy on Combustion and Emissions of Multi-point Injection Natural Gas Engine
- Vol. 56, Issue 2, Pages: 57-65(2022)
- 作者机构：
  
  哈尔滨工程大学动力与能源工程学院,哈尔滨,150001
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202202006
  CLC： TK43
- Online First：10 February 2022，
  
  Published：2022
- 稿件说明：
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Influence of Injection Strategy on Combustion and Emissions of Multi-point Injection Natural Gas Engine[J]. 2022, 56(2): 57-65.
DOI：

Influence of Injection Strategy on Combustion and Emissions of Multi-point Injection Natural Gas Engine[J]. 2022, 56(2): 57-65. DOI： 10.7652/xjtuxb202202006.

摘要

为了提高大缸径船用多点喷射稀薄燃烧天然气发动机在中低负荷下的缸内火焰传播速度及燃烧效率

进而优化发动机燃烧和排放

以喷气策略为切入点

采用台架试验与仿真两种方法

分别研究喷气方向与位置、喷气压力以及喷气时刻对发动机燃烧及排放的影响。结果表明:喷气方向与进气气流垂直可以增强扰动作用

喷气位置距气门远可以增加燃气射流在进气道中行进的距离

进而增加进气混合的均匀性

使浓混合气分布靠近火花塞

燃烧及排放明显改善; 喷气压力采用较高的736.63 kPa时可以增加喷射动能

提高缸内湍流强度、进气混合均匀性同时适应缸内大尺度掺混

使燃烧和排放更优; 随着喷气时刻的推迟

在点火时

缸内混合气形成明显的分层现象

混合气浓度自上而下逐渐降低

火花塞附近浓混合气利于火核发展

火焰传播速度加快

燃气燃烧效率提高。该文结果为实现大缸径船用天然气发动机高效清洁燃烧提供了理论依据。

Abstract

In order to improve the flame propagation velocity and combustion efficiency of large cylinder diameter marine multi-point jet rarefied combustion natural gas engine under medium and low load

and then optimize engine combustion and emissions

the influences of injection direction and position

injection pressure and injection time on engine combustion and emission are studied by bench test and simulation. The results show that the air injection direction perpendicular to the incoming air can enhance the disturbance effect

the air injection position far from the valve can increase the distance of the gas injection flow in the inlet

increase the uniformity of the mixing of the intake

thick mixture is distributed near the spark plug

and the combustion and emission are obviously improved. When the injection pressure is 736.63 kPa

the injection kinetic energy can be increased to improve turbulence intensity in cylinder and the mixing uniformity of the intake air. At the same time

it can adapt to the large-scale mixing in the cylinder

and the combustion and emission are better. With the delay of the injection timing

the mixture in the cylinder formed obvious stratification phenomenon during ignition

and the mixture concentration gradually decreases from top to bottom. The thick mixture near the spark plug is conducive to the development of the fire core

the flame propagation speed is accelerated

and the combustion efficiency of the gas is improved. It provides a theoretical basis for realizing efficient clean combustion of marine natural gas engine with large cylinder diameter.

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references

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