... metering valve 配量阀 metering wheel 草捆长度控制轮 metering-in control system 进入控制系统 ...
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seed-metering wheel 排种轮
gear wheel metering pump 齿轮计量泵
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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