入口段 meaning in Chinese

entrance
threshold zone

The current field in the centrifugal pump , which includes entrance pipe , impeller , volute and outlet pipe , is simulated and analyzed in this paper , and the solid particle trajectory is computed by using lagrange method under the flow field . some conclusions about the particle trajectory are given and validated by the engineering practices
本文研究了渣浆泵内吸入口段、叶轮区、蜗壳以及扩散管延长段的清水流场的流动状况，并且在此基础上用拉格朗日法模拟了固体单颗粒的运动轨迹，最后得到规律性的结论，与实际工程相吻合。