第四章

第四章矿井通风动力 ,[object Object],[object Object],[object Object],[object Object],[object Object]

第四章矿井通风动力 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],0 1 2 3 4 5 dz ρ 1 dz ρ 2 z

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],u θ

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

本次课的重点和难点 ,[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],4 5 6 z 1 2 3 5 6 h 4 4

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],1 1 z 2 2 h 1 ρ m1 ρ m2 1’

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Q H H t -Q H td -Q H S -Q H sd -Q

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[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],M 0 Q H n =630 n =710 n =560 R=0.5367 R’=0.7932 M 1 58 51.5

若使用厂家提供的不加外接扩散器的静压特性曲线Ｈ s ─ Ｑ，则要考虑安装扩散器所回收的风机出口动能的影响，此时所用的风阻Ｒ S 应小于Ｒ m ，即式中Ｒ v ── 相当于风机出口动能损失的风阻，Ｓ V ── 风机出口断面，即外接扩散器入口断面；Ｒ d ── 扩散器风阻；Ｒ Vd ── 相当于扩散器出口动能损失的风阻，Ｓ Vd ── 为扩散器出口断面。若使用通风机全压特性曲线Ｈ t ─ Ｑ，则需用全压风阻Ｒ t 作曲线，且若使用通风机装置全压特性曲线Ｈ td ─ Ｑ，则装置全压风阻应为Ｒ td ，且应当指出，在一定条件下运行时，不论是否安装外接扩散器，通风机全压特性曲线是唯一的，而通风机装置的全压和静压特性曲线则因所安扩散器的规格、质量而有所变化。

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