Experimental and Numerical Research on Laminar Burning Characteristics of Premixed Dimethyl Carbonate / Air Flames

doi:10.7652/xjtuxb201411005

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Experimental and Numerical Research on Laminar Burning Characteristics of Premixed Dimethyl Carbonate / Air Flames

更新时间：2025-07-09

- Experimental and Numerical Research on Laminar Burning Characteristics of Premixed Dimethyl Carbonate / Air Flames
- Vol. 48, Issue 11, Pages: 25-31(2014)
- 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/xjtuxb201411005
  CLC： TK16
- Online First：10 November 2014，
  
  Published：2014
- 稿件说明：
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Experimental and Numerical Research on Laminar Burning Characteristics of Premixed Dimethyl Carbonate / Air Flames[J]. 2014, 48(11): 25-31.
DOI：

Experimental and Numerical Research on Laminar Burning Characteristics of Premixed Dimethyl Carbonate / Air Flames[J]. 2014, 48(11): 25-31. DOI： 10.7652/xjtuxb201411005.

摘要

在定容燃烧弹上

利用高速纹影摄像系统对碳酸二甲酯(DMC)的预混层流燃烧特性进行了研究

获得了不同温度、压力和当量比下的层流燃烧速度、马克斯坦长度和胞状结构的临界半径

同时对火焰不稳定性进行了理论分析。研究表明:层流燃烧速度随当量比的增加先提高后下降

在当量比为1.1时达到峰值; 层流燃烧速度随初始温度的升高而提高

随初始压力的增加而降低; 马克斯坦长度、临界火焰半径随当量比和压力的增加而减小

表明火焰不稳定性随初始压力和当量比的增加而增强; 临界贝克来数Pe随当量比的增加而减小。利用Chemkin软件对预混层流燃烧速度进行了数值模拟

结果显示

Glaude机理对DMC层流燃烧速度的模拟值与实验测量值有较大偏差

表明该机理不能很好地预测DMC的层流燃烧速度。

Abstract

Experiment was conducted in a constant volume combustion chamber by high-speed schlieren photograph system. The unstretched laminar burning velocity

Markstein length and cellular critical radius of dimethyl carbonate(DMC)were obtained under different conditions of temperatures

pressures and equivalence ratios. Flame instabilities was also analyzed. The results show that the unstretched laminar burning velocity increases firstly then decreases with the increasing equivalence ratio and gets the peak at the equivalence ratio of 1.1; it also increases with the increasing initial temperatures and decreases with the increase of initial pressures. The Markstein length and cellular critical radius decrease with the increasing equivalence ratio and pressures to indicate that flame instabilities are enhanced with the increasing equivalence ratio and pressures

and the critical Peclet number decreases with the increasing equivalence ratio. The numerical simulation by Glaude mechanism and Chemkin program reveals that the mechanism is unable to predict the unstretched laminar burning velocity very well.

关键词

Keywords

references

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