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在工业通风中,人们常常想知道系统的通风量.用常规的方法测试风量在分环、多点采样时,操作不易掌握,在仪器不够精确,人员操作不够熟练时,误差较大。如果能定点采样,在较短时间内准确地测试出风量,将对测试工作带来方便。其实,一般的工业管道,在流体均匀流动时,截而的速度分布有一定的规律,掌握这个规律,我们只需测出圆形管道中心速度,便可计算出平均速度,从而得出风量。
In industrial ventilation, people often want to know the ventilation of the system.Using conventional methods to test the air volume in the ring, multi-point sampling, the operation is not easy to grasp, the instrument is not precise enough, the staff is not skilled enough, the error is larger. If you can spot sampling, accurate testing of the air volume in a relatively short period of time, will bring convenience to the test. In fact, the general industrial pipeline, the fluid flow, the truncated velocity distribution has a certain law, to grasp this rule, we only need to measure the center of the circular pipe speed, we can calculate the average speed, to draw the air volume.