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本文提供了在ΔP/P≤0.06情况下,标准喷咀流束膨胀系数的简化计算公式。其特点是可用计算尺计算ε值,得到有效数字达四位;因简化而造成的附加误差在流量计算的总误差中仍可低到被忽略的程度。
This article provides a simplified calculation of the standard nozzle jet expansion coefficient for ΔP / P ≤ 0.06. It is characterized by the use of a slide rule to calculate the value of ε, the effective number of up to four; due to simplify the additional error caused by the flow calculation of the total error can still be low to the extent neglected.