Determination of the fuel heat transfer dynamics via CFD for the purpose of noise analysis
Paper in proceedings, 2006

In this paper, a 3-dimensional CFD model of a PWR fuel pin surrounded by its cooling water was developed using the Fluent code. The full heterogeneity of the system was accounted for both radially and axially, and the temperature-dependence of the thermal properties of the different constituents was explicitly taken into account. The turbulent character of the flow was modeled via a k-e model. Thereafter, sinusoidal fluctuations of the power density around its mean value were induced for oscillation frequencies ranging from 0.01 Hz to 10 Hz. The transfer function between the fluctuations of the volume-averaged fuel temperature and the fluctuations of the volume-averaged power density, and the transfer function between the fluctuations of the volume-averaged moderator temperature and the fluctuations of the volume-averaged fuel temperature were then numerically determined. While the former can be approximated by a first-order system, the estimation of the analytical expression of the latter is rather complicated, due to the spatial dependence of the temperature and velocity fields in the coolant. This paper nevertheless gives numerical estimates of these transfer functions that can be used in any axially-homogenized lumped thermal-hydraulic model.

transfer function

numerical simulation

noise analysis

Computational Fluid Dynamics (CFD)

Author

Christophe Demaziere

Chalmers, Applied Physics, Nuclear Engineering

Håkan Mattsson

Chalmers, Applied Physics, Nuclear Engineering

Proc. 5th Int. Topl. Mtg. Nuclear Plant Instrumentation, Controls, and Human Machine Interface Technology (NPIC&HMIT 2006), Albuquerque, New Mexico, USA, November 12-16, 2006, American Nuclear Society

Areas of Advance

Energy

Subject Categories

Other Physics Topics

ISBN

0-89448-051-0

More information

Created

10/8/2017