采用非同步进气正时和增压器匹配提升天然气发动机的低速性能

郭喆晨 1; 黄勇成 1; 施永生 2; 刘伟 2; 韩志玉 3

doi:10.7652/xjtuxb201909008

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采用非同步进气正时和增压器匹配提升天然气发动机的低速性能

更新时间：2025-07-09

- 采用非同步进气正时和增压器匹配提升天然气发动机的低速性能
- Low-Speed Performance Improvement of Natural Gas Engine by Asynchronous Intake Timing and Turbocharger Matching
- 西安交通大学学报 2019年53卷第9期页码：55-60+78
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
  
  : 2019-04-08。作者简介: 郭喆晨(1993—),男,硕士生;黄勇成(通信作者),男,副教授。基金项目: 国家重点研发计划资助项目(2018YFB0105900)
- DOI：10.7652/xjtuxb201909008
  中图分类号： TK474
- 网络首发：2019-09-10，
  
  纸质出版：2019
- 稿件说明：
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郭喆晨 1, 黄勇成 1, 施永生 2, 等. 采用非同步进气正时和增压器匹配提升天然气发动机的低速性能[J]. 西安交通大学学报, 2019,53(9):55-60+78.

Low-Speed Performance Improvement of Natural Gas Engine by Asynchronous Intake Timing and Turbocharger Matching[J]. 2019, 53(9): 55-60+78.
郭喆晨 1, 黄勇成 1, 施永生 2, 等. 采用非同步进气正时和增压器匹配提升天然气发动机的低速性能[J]. 西安交通大学学报, 2019,53(9):55-60+78. DOI： 10.7652/xjtuxb201909008.

Low-Speed Performance Improvement of Natural Gas Engine by Asynchronous Intake Timing and Turbocharger Matching[J]. 2019, 53(9): 55-60+78. DOI： 10.7652/xjtuxb201909008.

摘要

为了提升由增压汽油机改造的天然气发动机的低速性能

设计了同步进气和非同步进气结合增压器匹配的优化方案

并通过台架试验和数值模拟的方法研究了各方案对天然气发动机性能的影响。天然气发动机匹配比原汽油机小的增压器显著提高了低速时的增压比

进而增加了进气流量。采用比原汽油机进气持续角和进气迟闭角小的同步进气方案

减小了发动机低速时的进气末期回流

使得低速时进气流量显著增加; 在此基础上

采用非同步进气方案

其中一个进气门的进气持续角进一步减小

导致低速时进气流量进一步增加

相对原机方案进气流量最大增加了46%

而另一个进气门进气持续角和进气迟闭角较大

保证了高速时可充分进气。采用非同步进气方案时缸内流动状况得到改善

最大燃烧放热率显著增加

燃烧持续期略有缩短。天然气发动机的性能经过优化后

相比原汽油机

低速扭矩最大提高了55.6%

经济性也有所改善

低速燃气消耗率最大降低了8.1%。

Abstract

Optimi-ation schemes of synchronous and asynchronous intake timing combined with turbocharger matching are designed to improve the low-speed performance of a natural gas engine modified from a turbocharged gasoline engine.Then bench test and numerical simulation are used to investigate the effects of different intake optimi-ation schemes on the performance of the natural gas engine.It is found that the boost pressure and the intake flow rate of the natural gas engine at low speeds increase obviously by matching a turbocharger smaller than that of the original gasoline engine.The backflow at the end of intake stroke is reduced at low speeds when adopting the synchronous intake timing scheme with a smaller intake duration angle and delayed closing angle

which results in an obvious increase in the intake flow rate at low speeds.When adopting asynchronous intake timing scheme

the further decreased intake duration angle of one intake valve may lead to a further increase of 46% in the inta

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references

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