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空气在风筒内流动当处于稳定区时,风速在风筒断面内的分布是均匀的,一般来说在风筒中心部分风速最大,而靠近风筒壁风速最小,如图1所示。当处于不稳定区时,就没有上述规律,如图2和图3所示。风流在不稳定区其速压值偏低,其情况如下:在图4中若 a 和 b 处于稳定区时,则有全压分别为 P_(全a)和 P_(全b),相应的静压为 P_(静a)和P_(静b)、速压为 h_(速a)和 h_(速b),则有:
Air flows in the duct When in the stable zone, the distribution of the wind speed in the duct section is uniform. Generally speaking, the wind speed is the highest in the central part of the duct and the minimum is the wind speed near the duct wall, as shown in FIG. 1. When in the unstable region, there is no such rule as shown in Figure 2 and Figure 3. In the unstable region, the velocity is low, the situation is as follows: If a and b are in the stable region in Figure 4, the total pressure is P_ (all a) and P_ (all b) respectively, and the corresponding static Pressure P_ (static a) and P_ (static b), the pressure h_ (speed a) and h_ (speed b), are: