单滴燃料高压着火与燃烧特性的试验研究

马志豪 1; 贾义 1; 李智博 1; 朱宇东 1; 陈占耀 1; 胡二江 2

doi:10.7652/xjtuxb201705014

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单滴燃料高压着火与燃烧特性的试验研究

更新时间：2025-07-09

- 单滴燃料高压着火与燃烧特性的试验研究
- High Pressure Ignition and Combustion Characteristics of Single Drop Fuel
- 西安交通大学学报 2017年51卷第5期页码：95-101+155
- 作者机构：
  
  河南科技大学车辆与交通工程学院,河南,洛阳,471003
- 作者简介：
- 基金信息：
  
  : 2016-09-15。作者简介: 马志豪(1965—),男,博士,教授。基金项目: 国家自然科学基金资助项
- DOI：10.7652/xjtuxb201705014
  中图分类号： V1
- 网络首发：2017-05-10，
  
  纸质出版：2017
- 稿件说明：
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马志豪 1, 贾义 1, 李智博 1, 等. 单滴燃料高压着火与燃烧特性的试验研究[J]. 西安交通大学学报, 2017,51(5):95-101+155.

High Pressure Ignition and Combustion Characteristics of Single Drop Fuel[J]. 2017, 51(5): 95-101+155.
马志豪 1, 贾义 1, 李智博 1, 等. 单滴燃料高压着火与燃烧特性的试验研究[J]. 西安交通大学学报, 2017,51(5):95-101+155. DOI： 10.7652/xjtuxb201705014.

High Pressure Ignition and Combustion Characteristics of Single Drop Fuel[J]. 2017, 51(5): 95-101+155. DOI： 10.7652/xjtuxb201705014.

摘要

采用挂滴法对正常重力条件下正十七烷液滴的高压着火与燃烧现象进行了试验研究

采用嵌入液滴内部的热电偶和高速相机分别记录了液滴温度变化和液滴发展情形。试验结果表明:随着环境压力的提高

液滴着火区域减小且靠近液滴表面

燃烧火焰中碳烟的生成增多

火焰宽度减小; 在亚临界压力下液滴温度曲线在着火时突变

之后会维持一段较为平坦的过程

而在超临界压力下液滴温度曲线斜率较大

液滴界面温度超过了燃料临界温度; 环境压力小于0.6倍临界压力时

液滴着火温度随着压力的提高迅速升高且在临界压力附近温升停止

而环境压力大于1.2倍临界压力时

液滴着火温度随着压力的提高继续升高; 亚临界压力下液滴燃烧时间随着环境压力的提高迅速缩短

此时相平衡控制着液滴燃烧速率

而超临界压力下液滴燃烧时间不再继续缩短且趋于稳定

此时液滴已不存在相变过程

扩散系数开始影响燃烧速率。该结果可为高压环境中发动机着火及燃料燃烧特性研究提供参考。

Abstract

With hanging drop method under normal gravity condition

the droplet of heptadecane in high pressure ignition and combustion phenomena is detailedly researched. Embedded thermocouple inside the droplet and high-speed cameras record the droplet temperature variation and droplet development images. The experiment shows that with environment pressure increasing

the fire region of droplet reduces and tends to liquid drop surface

the carbon smoke generated in burning flame increases and flame width reduces; in subcritical pressure environment

the temperature curve of droplet after the corresponding mutation of burning maintains a flat process; in supercritical pressure environment

the temperature of droplet rises at a high rate

and the interface temperature gets over the fuel critical one. When ambient pressure is less than 0.6 time of critical pressure

the ignition temperature of droplet increases rapidly with ambient pressure and stops near critical pressure

but when environmental pressure is higher than 1.2 times of the critical pressure

the ignition temperature of droplet continues to increase with the increasing pressure. The droplet combustion time under subcritical pressure decreases rapidly with the increasing ambient pressure

and the droplet combustion rate is controlled by the phase equilibrium; under supercritical environment pressure

droplet combustion time no longer continues to decrease but tends to stable

droplet phase transition does not exist in this period

and the diffusion coefficient begins to affect combustion rate.

关键词

Keywords

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