稀释气对离子电流影响的试验研究与机理分析

贾伟东; 何子奇; 杨猛; 魏旭星; 邓宇; 高忠权

doi:10.7652/xjtuxb201901019

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稀释气对离子电流影响的试验研究与机理分析

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- 稀释气对离子电流影响的试验研究与机理分析
- Experimental Study and Mechanism Analysis on the Influence of Dilution Gas on Ion Current
- 西安交通大学学报 2019年53卷第1期页码：142-149
- 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：
  
  : 2018-03-01。作者简介: 贾伟东(1992—),男,硕士生;高忠权(通信作者),男,副教授,博士生导师。基金项目: 国家自然科学基金资助项目(51306143);中央高校基本科研业务费专项资金资助项目(xjj2013001)
- DOI：10.7652/xjtuxb201901019
  中图分类号： TK431
- 网络首发：2019-01-10，
  
  纸质出版：2019
- 稿件说明：
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贾伟东, 何子奇, 杨猛, 等. 稀释气对离子电流影响的试验研究与机理分析[J]. 西安交通大学学报, 2019,53(1):142-149.

Experimental Study and Mechanism Analysis on the Influence of Dilution Gas on Ion Current[J]. 2019, 53(1): 142-149.
贾伟东, 何子奇, 杨猛, 等. 稀释气对离子电流影响的试验研究与机理分析[J]. 西安交通大学学报, 2019,53(1):142-149. DOI： 10.7652/xjtuxb201901019.

Experimental Study and Mechanism Analysis on the Influence of Dilution Gas on Ion Current[J]. 2019, 53(1): 142-149. DOI： 10.7652/xjtuxb201901019.

摘要

针对稀释气体影响离子电流前锋区特征峰的研究比较缺乏

以甲烷/空气/稀释气体为对象

通过在定容燃烧弹内布置离子电流测量电极

获得了稀释气种类N

/CO

/Ar和0%、5%、10%、15%几种不同稀释比条件下离子电流的特征峰值

结合CHEMKIN化学反应动力学数值模拟结果

分析了主导离子电流前锋区信号生成的带电组分的数密度、敏感性系数及其生成路径。试验结果表明:相同的稀释比下

稀释对离子电流信号的抑制作用最大; 在不同的稀释气体种类下

离子电流前锋区峰值均在过量空气系数λ为0.95时达到最大。数值计算结果表明

对离子电流前锋区信号贡献最大的组分是H

和电子e

链分支反应R38、链终止反应R52和离子化初始反应R326对这两种组分浓度的影响较大。在过量空气系数λ为0.95时

O和CH数密度都较大且反应区温度最高

导致化学离子化程度最大

离子电流值前锋区峰值也达到最大值。该结论为研究稀释气体对燃料燃烧的离子电流信号影响和火焰锋面电学特性提供了一定的机理支撑。

Abstract

To explore the influence of dilution gases on the characteristic peaks of the flame front ion current

methane-air-dilution gases were selected as the objects

and the characteristic peak values of ion current under dilution gases(N

/Ar/CO

)and different dilution ratios(0%

10% and 15%)were obtained by arranging electrodes in the constant volume combustion bomb. The number densities

sensitivity coefficients and generation paths of the dominant charged species affecting flame front ion current signals were analyzed by CHEMKIN chemical reaction numerical simulation. The experimental results sh

ow that there is the greatest inhibitory effect on ion current signal under the condition of CO

dilution. The flame front ion current peak reaches its maximum values when excess air coefficient λ is equal to 0.95 under the condition of different dilution gases. The numerical results indicate that the species which contribute most to the flame front ion current signal are H

and electron. The chain branching reaction R38

the chain termination reaction R52 and the ionization initial reaction R326 have greater influences on the concentration of the two species. When λ is equal to 0.95

the number densities of O and CH radicals and the reaction zone temperature are the highest

resulting in the largest degree of chemical ionization

and the flame front ion current peak value also reaches its maximum. The conclusions of this paper provide a support for the study of the effects of dilution gas on the ion current signal in fuel combustion and the electrical characteristics of the flame front.

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Keywords

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