In addition, the pressure and velocity in cooling fan flow field are analyzed and the relations between flow rate, rotation speed, blade number and aerodynamic noise of cooling fan are studied.

同时，对风扇流场的压力和速度进行分析；研究了风扇流量、风扇转速、扇叶数和气动噪声相互之间的关系。

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The diffuser of mine main fan is a device to use reducing velocity pressure of outlet, increase static pressure and recovery kinetic energy.

矿井主扇扩散器是用来降低出口速压以提高风机静压而回收风机出口动能的装置。

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The study shows that the separation size is related to the rotary velocity of the turbo, the wind volume and the wind pressure of the exhaust fan, the structure and parameters of the turbo.

研究表明：分级粒径的大小与涡轮转速、抽风机风量、风压及涡轮结构参数有关。

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