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    Experimental investigation and simulation of the Flow Comparator prototype as new primary standard for high pressure natural gas in Germany
    (2020-02)
    Singh, Sukhwinder
    ;
    Schmitz, Gerhard
    ;
    Mickan, Bodo
    The Flow Comparator is a development of a new primary standard for calibration of high-pressurenatural gas metersby the German national metrological institute, Physikalisch-Technische Bundesanstalt. The Flow Comparator uses an actively driven piston which isbased on the comparator principle to measure the flow rate by measuring the time the piston needs to displace a defined volume of enclosed gas in a cylinder. A scale model is used to test the system. Based on this,a computational model is developed for deeper understanding of the Flow Comparator’s dynamic behavior and the interaction with other components in the system. It allows to gather detailed information at any location of the system as well as testing different configurations and parameters of the system components. The validation of the developed computational model shows good accordance with measured piston velocity and differential pressure at the piston. The model is used to optimize the control voltage trajectory applied to the piston to maximize available calibration time and to improve the overall calibration process.
    Publicationtype: Conference Paper
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    Modeling of the flow comparator prototype as new primary standard for high pressure natural gas flow metering
    (Universität, 2019-03)
    Singh, Sukhwinder
    ;
    Schmitz, Gerhard
    ;
    Mickan, Bodo
    The German national metrological institute, Physikalisch-Technische Bundesanstalt, is developing a new concept for volumetric primary standard to calibrate high pressure gas flow meters. The TUHH is supporting these R&D activities with its competence to elaborate computational models for detailed analysis of complex mechanical systems including fluid flow aspects. The new primary standard is based on a actively driven piston prover to measure the gas flow rate using the time the piston needs to displace a defined enclosed volume of gas in a cylinder. A computational model written in Modelica R is developeto investigate the Flow Comparator’s dynamic behavior. Validation of the model shows good compliance of the piston velocity and differential pressure at the piston in the model with measured data. With this model the control voltage trajectory can be optimized to increase the available measuring time and it allows to gather detailed information about pressure and temperature development at arbitrary chosen locations in the system with high time resolution.
    Publicationtype: Conference Paper
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