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  • An uncertainty analysis of the PVT gauging method
    責任編輯:hylng    瀏覽:1445次    時間: 2013-06-03 15:13:55      

    摘要:The PVT (pressure, volume, temperature) method of liquid quantity gauging in low-gravity is based on gas law calculationsassuming conservation of pressurant gas within the propellant tank and the pressurant supply bottle. There is interest in appl..

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    The PVT (pressure, volume, temperature) method of liquid quantity gauging in low-gravity is based on gas law calculations
    assuming conservation of pressurant gas within the propellant tank and the pressurant supply bottle. There is interest in applying
    this method to cryogenic propellant tanks since the method requires minimal additional hardware or instrumentation. To use PVT
    with cryogenic fluids, a non-condensable pressurant gas (helium) is required. With cryogens, there will be a significant amount of
    propellant vapor mixed with the pressurant gas in the tank ullage. This condition, along with the high sensitivity of propellant vapor
    pressure to temperature, makes the PVT method susceptible to substantially greater measurement uncertainty than is the case with
    less volatile propellants. A conventional uncertainty analysis is applied to example cases of liquid hydrogen and liquid oxygen tanks.
    It appears that the PVT method may be feasible for liquid oxygen. Acceptable accuracy will be more difficult to obtain with liquid
    hydrogen.

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