首先假定输送比，初定气流速度，由农业技术要求确定排种量，从而确定风量，计算得到管道的直径。
First we presume feeding rate, ascertaining the velocity of air current, ascertaining the feeding quantity by farm technical demand and ascertaining wind quantity, calculating the diameter of pipe.
首先应用自由尾流分析技术来计算旋翼尾迹和发动机绕排流空间的洗流速度。
First, free wake analysis was carried out to calculate the rotor wake geometry and the downwash around the engine jet space.
当井筒内气流速度低于维持气井连续排液的临界气流速度时，气井出现携液现象。
When gas flow velocity in a wellbore is less than a critical gas flow velocity maintaining continuous flowing back in a gas well, a liquid carrying phenomenon occurs in the gas well.
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