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    Linear and Nonlinear Stability Analysis of a Supercritical Natural Circulation Loop

    Source: Journal of Engineering for Gas Turbines and Power:;2010:;volume( 132 ):;issue: 010::page 102904
    Author:
    Manish Sharma
    ,
    R. K. Sinha
    ,
    P. K. Vijayan
    ,
    D. S. Pilkhwal
    ,
    D. Saha
    DOI: 10.1115/1.4000342
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Supercritical water (SCW) has excellent heat transfer characteristics as a coolant for nuclear reactors. Besides it results in high thermal efficiency of the plant. However, the flow can experience instabilities in supercritical water cooled reactors, as the density change is very large for the supercritical fluids. A computer code SUCLIN has been developed employing supercritical water properties to carry out the steady-state and linear stability analysis of a SCW natural circulation loop (SCWNCL). The conservation equations of mass, momentum, and energy have been linearized by imposing small perturbation in flow rate, enthalpy, pressure, and specific volume. The equations have been solved analytically to generate the characteristic equation. The roots of the equation determine the stability of the system. The code has been benchmarked against published results. Then the code has been extensively used for studying the effect of diameter, heater inlet temperature, and pressure on steady-state and stability behavior of a SCWNCL. A separate computer code, NOLSTA, has been developed, which investigates stability characteristics of supercritical natural circulation loop using nonlinear analysis. The conservation equations of mass, momentum, and energy in transient form were solved numerically using finite volume method. The stable, unstable, and neutrally stable points were identified by examining the amplitude of flow and temperature oscillations with time for a given set of operating conditions. The stability behavior of loop, predicted using nonlinear analysis has been compared with that obtained from linear analysis. The results show that the stability maps obtained by the two methods agree qualitatively. The present paper describes the linear and nonlinear stability analysis models and the results obtained in detail.
    keyword(s): Stability , Flow (Dynamics) , Steady state , Temperature , Pressure AND Equations ,
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      Linear and Nonlinear Stability Analysis of a Supercritical Natural Circulation Loop

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    http://yetl.yabesh.ir/yetl1/handle/yetl/143072
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    • Journal of Engineering for Gas Turbines and Power

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    contributor authorManish Sharma
    contributor authorR. K. Sinha
    contributor authorP. K. Vijayan
    contributor authorD. S. Pilkhwal
    contributor authorD. Saha
    date accessioned2017-05-09T00:37:29Z
    date available2017-05-09T00:37:29Z
    date copyrightOctober, 2010
    date issued2010
    identifier issn1528-8919
    identifier otherJETPEZ-27138#102904_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/143072
    description abstractSupercritical water (SCW) has excellent heat transfer characteristics as a coolant for nuclear reactors. Besides it results in high thermal efficiency of the plant. However, the flow can experience instabilities in supercritical water cooled reactors, as the density change is very large for the supercritical fluids. A computer code SUCLIN has been developed employing supercritical water properties to carry out the steady-state and linear stability analysis of a SCW natural circulation loop (SCWNCL). The conservation equations of mass, momentum, and energy have been linearized by imposing small perturbation in flow rate, enthalpy, pressure, and specific volume. The equations have been solved analytically to generate the characteristic equation. The roots of the equation determine the stability of the system. The code has been benchmarked against published results. Then the code has been extensively used for studying the effect of diameter, heater inlet temperature, and pressure on steady-state and stability behavior of a SCWNCL. A separate computer code, NOLSTA, has been developed, which investigates stability characteristics of supercritical natural circulation loop using nonlinear analysis. The conservation equations of mass, momentum, and energy in transient form were solved numerically using finite volume method. The stable, unstable, and neutrally stable points were identified by examining the amplitude of flow and temperature oscillations with time for a given set of operating conditions. The stability behavior of loop, predicted using nonlinear analysis has been compared with that obtained from linear analysis. The results show that the stability maps obtained by the two methods agree qualitatively. The present paper describes the linear and nonlinear stability analysis models and the results obtained in detail.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleLinear and Nonlinear Stability Analysis of a Supercritical Natural Circulation Loop
    typeJournal Paper
    journal volume132
    journal issue10
    journal titleJournal of Engineering for Gas Turbines and Power
    identifier doi10.1115/1.4000342
    journal fristpage102904
    identifier eissn0742-4795
    keywordsStability
    keywordsFlow (Dynamics)
    keywordsSteady state
    keywordsTemperature
    keywordsPressure AND Equations
    treeJournal of Engineering for Gas Turbines and Power:;2010:;volume( 132 ):;issue: 010
    contenttypeFulltext
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