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    A Study of Bulk Modulus, Entrained Air, and Dynamic Pressure Measurements in Liquids

    Source: Journal of Engineering for Gas Turbines and Power:;2016:;volume( 138 ):;issue: 010::page 101601
    Author:
    Hurst, Adam M.
    ,
    VanDeWeert, Joe
    DOI: 10.1115/1.4033215
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Accurate static and dynamic pressure measurements in liquids, such as fuel, oil, and hydraulic fluid, are critical to the control and health monitoring of turbomachinery and aerospace systems. This work presents a theoretical and experimental study of the frequency response of pressure transducers and pressure measurement systems in liquid media. First, we theoretically predict the frequency response of pressure transducers based upon a lumpedparameter model. We then present a liquidbased dynamic pressure calibration test apparatus that validates this model by performing several critical measurements. This system first uses a vibrating liquid column to dynamically calibrate and experimentally determine the frequency response of a test pressure transducer, measurement system or geometry. Second, this calibration system experimentally extracts the bulk modulus of the fluid and the percent of entrained and/or dissolved air by volume. Bulk modulus is determined by measuring the speed of sound within the liquid and through static pressure loading while measuring the deflection of the liquid column. Bulk modulus and the entrained/dissolved gas content within the liquid greatly impact the observed frequency response of a pressure transducer or geometry. Gases, such as air, mixed or dissolved into a fluid can add substantial damping to the dynamic response of the fluid measurement system, which makes measurement of the bulk modulus and entrained and/or dissolved air critical for accurate measurement of the frequency response of a system when operating with a liquid media. All experimental results are compared to theoretical predictions.
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      A Study of Bulk Modulus, Entrained Air, and Dynamic Pressure Measurements in Liquids

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    contributor authorHurst, Adam M.
    contributor authorVanDeWeert, Joe
    date accessioned2017-05-09T01:28:51Z
    date available2017-05-09T01:28:51Z
    date issued2016
    identifier issn1528-8919
    identifier otherturbo_138_10_101011.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/161194
    description abstractAccurate static and dynamic pressure measurements in liquids, such as fuel, oil, and hydraulic fluid, are critical to the control and health monitoring of turbomachinery and aerospace systems. This work presents a theoretical and experimental study of the frequency response of pressure transducers and pressure measurement systems in liquid media. First, we theoretically predict the frequency response of pressure transducers based upon a lumpedparameter model. We then present a liquidbased dynamic pressure calibration test apparatus that validates this model by performing several critical measurements. This system first uses a vibrating liquid column to dynamically calibrate and experimentally determine the frequency response of a test pressure transducer, measurement system or geometry. Second, this calibration system experimentally extracts the bulk modulus of the fluid and the percent of entrained and/or dissolved air by volume. Bulk modulus is determined by measuring the speed of sound within the liquid and through static pressure loading while measuring the deflection of the liquid column. Bulk modulus and the entrained/dissolved gas content within the liquid greatly impact the observed frequency response of a pressure transducer or geometry. Gases, such as air, mixed or dissolved into a fluid can add substantial damping to the dynamic response of the fluid measurement system, which makes measurement of the bulk modulus and entrained and/or dissolved air critical for accurate measurement of the frequency response of a system when operating with a liquid media. All experimental results are compared to theoretical predictions.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleA Study of Bulk Modulus, Entrained Air, and Dynamic Pressure Measurements in Liquids
    typeJournal Paper
    journal volume138
    journal issue10
    journal titleJournal of Engineering for Gas Turbines and Power
    identifier doi10.1115/1.4033215
    journal fristpage101601
    journal lastpage101601
    identifier eissn0742-4795
    treeJournal of Engineering for Gas Turbines and Power:;2016:;volume( 138 ):;issue: 010
    contenttypeFulltext
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