It is defined by PVT sampling analysis with high cost and related experience formulae with low accuracy at present, so it is difficult to define the saturation pressure.
2
分析了罗茨鼓风机轴功率随压差和转速变化的特性，导出了相应的换算公式。
The character on change of the shaft power with the differential pressure or rotational speed for Roots blower is analysed, the conversion formulas for the shaft power are deduced.
3
讨论了两种实现变极化的方法，推导了求解波型差相移、非互易差相移和变极化系数的精确公式。
Two methods of variable polarization are discussed, and some formulae for wave-mode differential phase, nonreciprocal phase and variable polarization coefficient are deduced.
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