By changing wind speed and the wind direction angle between fuel surface and longitudinal wind direction,the effects of wind speed and wind direction on the flame length of pool fires have been studied in this paper.The results show that with the increase of wind speed,the combustion characteristics of alcohol pool fires are quite different from those of n-heptane pool fires.Under the tested conditions,the flame length of alcohol pool fire firstly increases and then decreases with the increase of wind speed,while the flame length of n-heptane pool fire firstly increases and then keeps almost unchanged as wind speed increases.It is also found that the flame length is proportional to the side rim of pool,while it decreases with the increase of wind direction angle.%通过改变风速以及纵向风与燃料表面之间的风向角,研究了风速和风向变化对池火火焰长度的影响.研究结果表明,随着风速的增加,酒精池火和正庚烷池火表现出迥然不同的特征.在本研究工况条件下,酒精池火的火焰长度随着风速的增大先增长,而后逐步缩短;正庚烷池火的火焰长度随着风速的增大首先增长,而当风速增大到一定值后,其火焰长度保持相对稳定.实验发现,酒精池火和正庚烷池火的火焰长度均随着风向角的增大而减小,相同面积的燃料盘,其火焰长度与燃料盘顺风面边长成正比,与背风面等无关.
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