Laser Absorption Spectrum Measurement of OH Concentration Time-Histories in n-heptane Oxidation

doi:10.7652/xjtuxb202109013

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Laser Absorption Spectrum Measurement of OH Concentration Time-Histories in n-heptane Oxidation

更新时间：2025-07-09

- Laser Absorption Spectrum Measurement of OH Concentration Time-Histories in n-heptane Oxidation
- Vol. 55, Issue 9, Pages: 113-120+140(2021)
- 作者机构：
  
  西安交通大学动力工程多相流国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202109013
  CLC： TN23
- Online First：10 September 2021，
  
  Published：2021
- 稿件说明：
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Laser Absorption Spectrum Measurement of OH Concentration Time-Histories in n-heptane Oxidation[J]. 2021, 55(9): 113-120+140.
DOI：

Laser Absorption Spectrum Measurement of OH Concentration Time-Histories in n-heptane Oxidation[J]. 2021, 55(9): 113-120+140. DOI： 10.7652/xjtuxb202109013.

摘要

为了提供宽温度范围下正庚烷模型的微观验证数据

利用激波管反射激波方法结合紫外吸收光谱诊断技术

以OH基的A-X(0

0)跃迁R

(5)谱线中306.686 8 nm为中心诊断波长

测量了温度1 197～1 690 K、压力150 kPa、当量比1.0、燃料初始体积分数0.1%下

正庚烷/氧气/氩气混合气氧化过程中OH基浓度时程。结果表明

激波管真空度和漏气率是影响OH基浓度峰值的主导因素

结果分析中必须给予考虑以确保实验结果的准确性。实验观测到了正庚烷氧化过程OH基浓度时程演变的3种形态

发现入射激波引起的非理想物理边界层效应对OH基浓度时程测量影响显著。与已有的5个代表性正庚烷模型预测值比较发现

当前工况下模型可准确预测各温度下OH基浓度时程演变趋势

但各模型在同时预测宏观点火延迟和微观OH基浓度方面仍有缺陷

温度越低

各模型对点火延迟期的预测偏差越大。反应(·overC)H

+H(·overO)

=CH

(·overO)+(·overO)H对正庚烷模型点火延迟预测性能影响较大

对该反应动力学参数的深入研究有助于完善正庚烷机理。

Abstract

To provide microscopic validation data for n-heptane models over a wide temperature range

microsecond-resolved OH concentration time-histories were measured behind reflected shock waves in the oxidation of stoichiometric n-heptane(volume fraction of 0.1%)/O

/Ar mixtures over the temperature(T

)range of 1 197-1 690 K at the pressures(p

)around 150 kPa. The OH time-histories were monitored by narrow-linewidth ring dye laser absorption near 306.7 nm at the well-characterized R

(5)transition of the OH A-X(0

0)band. Results reveal that vacuum degre

e and leaking rates are the two dominant factors affecting peak value of the measured OH concentrations. Three morphologies of OH time-histories in n-heptane oxidation were observed

and the non-ideal physical boundary layer effect caused by incident shock wave shows a significant effect on OH concentration. Five commonly used mechanisms of n-heptane generally show acceptable predictions in the trend of OH time-histories at various temperatures

but are still not satisfactory in predicting both ignition delay time and OH time-histories simultaneously

and it shows that the lower the temperature

the greater the deviation between the model simulations and experimental measurements during induced ignition time. Reaction of(·overC)H

+H(·overO)

=CH

(·overO)+(·overO)H has a great impact on the predictions in ignition delay times of n-heptane models

and further study on the kinetic parameters of this reaction is beneficial to refining the n-heptane models.

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