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为探究巷道断面平均风速分布规律,准确测定风速大小,利用激光多普勒测速仪(LDA)进行测试试验,并通过Fluent数值模拟方法研究矩形、半圆拱和梯形巷道断面的风速分布特征。试验表明,风流质点速度呈湍流随机脉动特性,但服从正态分布。就瞬时风速而言,巷道断面平均风速分布环状曲线为不规则波浪形式;Fluent模拟表明,巷道风流充分发展的断面上的平均风速分布与通风风速大小无关,仅与巷道断面形状有关。基于统计平均的试验结果与Fluent数值模拟结果吻合较好,进一步说明,可以在巷道断面平均风速分布点位布置测点,考虑风流脉动影响,将该测点风流各态遍历周期内的速度统计均值作为巷道断面平均风速,无需系数校正。
In order to explore the distribution of average wind speed in the section of roadway, the wind speed was accurately measured. The laser Doppler velocimeter (LDA) was used to test the wind speed distribution. The distribution of wind speed in rectangular, semicircular and trapezoidal tunnel sections was studied by Fluent numerical simulation. Experiments show that the velocity of turbulent particles is turbulent random fluctuation but obeys normal distribution. As for the instantaneous wind speed, the annular curve of the average wind speed distribution in the section of the roadway is in the form of irregular waves. The Fluent simulation shows that the average wind speed distribution on the well-developed section of the roadway has nothing to do with the size of the ventilation wind speed. Based on statistical averaging, the experimental results are in good agreement with the numerical results of Fluent. Further, the measured points can be arranged at the average wind speed distribution point of the roadway section. Considering the influence of the wind pulsation, As the mean wind speed in the tunnel section, no coefficient correction is needed.