Study on nitrogen diluted propane–air premixed flames at elevated pressures and temperatures
Study on nitrogen diluted propane–air premixed flames at elevated pressures and temperatures
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DOI：
10.1016/j.enconman.2009.09.024
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发表时间：
2010-02
影响因子：
10.4
通讯作者：
Chenglong Tang;Jianjun J. Zheng;Zuo-hua Huang;Jinhua Wang
中科院分区：
文献类型：
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作者：
Chenglong Tang;Jianjun J. Zheng;Zuo-hua Huang;Jinhua Wang
采用高压定容燃烧室，利用纹影摄影和高速数码相机对氮气稀释丙烷-空气火花点火向外膨胀火焰的传播和形态进行了成像和记录。随后在较宽的初始温度、初始压力和氮气稀释比范围内测定了未拉伸层流燃烧速度和Markstein长度。两个最近开发的机制被用来预测参考层流燃烧速度。结果表明，未拉伸层流燃烧速度的实测值与文献值和计算预测值吻合较好。火焰图像表明，随着混合气浓度的增加，扩散热不稳定性增强;流体动力不稳定性随初始压力的增加而增强，随稀释比的增加而减弱。归一化层流燃烧速度与稀释率呈线性关系，表明氮气稀释的影响在较高压力下更为明显。
Using a high pressure constant volume combustion vessel, the propagation and morphology of spark-ignited outwardly expanding nitrogen diluted propane–air flames were imaged and recorded by schlieren photography and high-speed digital camera. The unstretched laminar burning velocities and Markstein lengths were subsequently determined over wide range of initial temperatures, initial pressures and nitrogen dilution ratios. Two recently developed mechanisms were used to predict the reference laminar burning velocity. The results show that the measured unstretched laminar burning velocities agree well with those in the literature and the computationally predicted results. The flame images show that the diffusional–thermal instability is promoted as the mixture becomes richer, and the hydrodynamic instability is increased with the increase of the initial pressure and it is decreased with the increase of dilution ratio. The normalized laminar burning velocities show a linear correlation with respect to the dilution ratio, indicating that the effect of nitrogen dilution is more obvious at higher pressures.