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當壓力變化不大,空氣密度可認為不變,位置壓差也可忽略時,空氣密度、空氣流速和壓強之間的關係可用氣流的能量方程表示:P1+ρV1^2/2= P2+ρV2^2/2+ Pw式中:P1、P2——斷面1、2的相對壓強,稱靜壓;ρV1^2/2、ρV2^2/2…
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