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A Numerical Thermal-Hydraulic Model to Simulate the Fast Transients in a Supercritical Water Channel Subjected to Sharp Pressure Variations

Published online by Cambridge University Press:  17 May 2016

Goutam Dutta ,
Jin Jiang ,
Rohit Maitri  and
Chao Zhang
Goutam Dutta*
Affiliation:
Mechanical Engineering, PDPM Indian Institute of Information Technology, Design and Manufacturing Jabalpur, Jabalpur: 482 005, Madhya Pradesh, India; Electrical and Computer Engineering, University of Western Ontario (UWO), London, Ontario, N6A 5B9, Canada
Jin Jiang*
Affiliation:
Electrical and Computer Engineering, University of Western Ontario (UWO), London, Ontario, N6A 5B9, Canada
Rohit Maitri*
Affiliation:
Mechanical and Materials Engineering, University of Western Ontario (UWO), London, Ontario, N6A 5B9, Canada
Chao Zhang*
Affiliation:
Mechanical and Materials Engineering, University of Western Ontario (UWO), London, Ontario, N6A 5B9, Canada
*
*Corresponding author. Email addresses:[email protected] (G. Dutta), [email protected] (J. Jiang), [email protected] (R. Maitri), [email protected] (C. Zhang)
*Corresponding author. Email addresses:[email protected] (G. Dutta), [email protected] (J. Jiang), [email protected] (R. Maitri), [email protected] (C. Zhang)
*Corresponding author. Email addresses:[email protected] (G. Dutta), [email protected] (J. Jiang), [email protected] (R. Maitri), [email protected] (C. Zhang)
*Corresponding author. Email addresses:[email protected] (G. Dutta), [email protected] (J. Jiang), [email protected] (R. Maitri), [email protected] (C. Zhang)
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Abstract

The present work demonstrates the extension of a thermal-hydraulic model, THRUST, with an objective to simulate the fast transient flow dynamics in a supercritical water channel of circular cross section. THRUST is a 1-D model which solves the nonlinearly coupled mass, axial momentum and energy conservation equations in time domain based on a characteristics-dependent fully implicit finite difference scheme using an Eulerian approach. The model developed accounts for the compressibility of the supercritical flow by considering the finite value of acoustic speed in the solution algorithm and treats the boundary conditions naturally. A supercritical water channel of circular cross section, for which the experimental data is available at steady state operating conditions, is chosen for the transient simulations to start with. Two different case studies are undertaken with a purpose to assess the capability of the model to analyze the fast transient processes caused by the large reduction in system pressure. The first transient case study is where the initial exit pressure is reduced by 1 MPa exponentially in a time span of 5 s. In the second case study, the transient is initiated with a sudden step decrease in the exit pressure by the same amount. Results obtained for both the case studies show the desired performance from the model developed.

Keywords

Thermal-hydraulic modelsupercritical waterfast transients due to large reduction in system pressure
Type
Research Article
Information
Communications in Computational Physics , Volume 19 , Issue 5 , May 2016 , pp. 1529 - 1541
Copyright
Copyright © Global-Science Press 2016 

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References

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