Experimental study on the effect of spray cone angle on the characteristics of horizontal jet spray flame under sub-atmospheric pressure

Thermal Science

Qiu Xingqi¹  Xie Kai¹  Cui Yunjing²  Wang Jianxin³ 

[1] College of Chemical Engineering, China University of Petroleum (East China), China;College of Electromechanical Engineering, China University of Petroleum (East China), China;Yunnan Aerospace Industry Co. Ltd, Kunming, China;

关键词: spray cone angle;    spray flame;    horizontal uplifted height;    flame temperature;    sub-atmospheric pressure;   

DOI  :  10.2298/TSCI181106014X

来源: DOAJ

【 摘 要 】

The burning state of a plateau environment is attracting more and more attention. In this paper, in order to have a deeper scientific understanding of diesel spray combustion and the characteristics of a flame under different spray cone angles in a plateau environment, experiments were carried out in a low pressure chamber. The flame morphology was recorded by a high speed video instrument, and the temperature change was recorded by a thermal imager and thermocouples. The MATLAB programming was used to process the video image of the flame, and the probability of its binarization was calculated. The results indicate that the flame becomes longer and wider under different pressures with the same spray angle. The variation is more pronounced at a smaller spray taper angle. The flame uplifted height characteristic is mainly negatively related to the atmospheric pressure. According to the normalized flame temperature and the dimensionless horizontal projection, the length can be divided into three regions. In the region of buoyancy flame, the dimensionless temperature varies with sub-atmospheric pressure more than with normal pressure. In addition, under different spray cone angle conditions, the law of variation in the normalized flame temperature under sub-atmospheric pressure is exactly opposite to that under normal pressure. This study is of great significance to the scientific research on flames in a low pressure environment, and the design of different fuel nozzles for application in a plateau environment.

【 授权许可】

Unknown