The TAB contains a toothed wheel which is driven at a high angular velocity by the impinging airstreams.
舵片上有一个带齿的轮，这个轮受到气流的冲击而高速转动。
In certain conditions pressure and velocity distribution of air flow inside the conical holes of the seed-metering wheel can be analysed and calculated approximately as in an angular region.
论证了在一定条件下，排种器锥孔中的压力和速度分布可以近似的按角形域进行分析和计算。
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