Experimental method for measuring equivalent mixing coefficient of rod bundle channel

Abstract

The invention relates to the technical field of thermal performance experiments, and discloses an experimental method for measuring an equivalent mixing coefficient of a rod bundle channel, which comprises the following steps of: building an experimental model; inserting a plurality of experiment rods into a cavity, the experiment rod dividing the cavity into a plurality of sub-channels which are communicated with one another; injecting water with the temperature of T1 into the cavity; injecting water with the temperature of T2 into the center of the cavity, T2 being greater than T1; measuring the temperatures in the sub-channels to obtain actual temperature values; taking n numbers in the range of 0-0.5 as virtual turbulence exchange coefficients; inputting the virtual turbulence exchange coefficients into a COBRA program, and calculating virtual temperature values corresponding to the virtual turbulence exchange coefficients by using the COBRA program; comparing the virtual temperature values with the actual temperature values, and defining the virtual temperature value closest to the actual temperature value as a determined temperature value; and determining a virtual turbulence exchange coefficient corresponding to the temperature value, namely the rod bundle channel mixing coefficient. According to the invention, the equivalent mixing coefficient of a rod bundle channel can be determined.

Description

technical field [0001] The invention relates to the technical field of thermal performance experiments, in particular to an experimental method for measuring the equivalent mixing coefficient of a rod bundle channel. Background technique [0002] The fuel assembly is a key component of a nuclear reactor, and the cross-mixing ability between the sub-channels of the fuel assembly is of great significance to the thermal design of the reactor. For the bundle assembly, the lateral mixing between subchannels is mainly caused by the natural diffusion of vortices in the bundle channels. This kind of lateral mixing is called turbulent mixing, and the turbulent mixing coefficient is used to quantitatively describe turbulent mixing. The main feature of turbulent mixing is that adjacent subchannels exchange energy and momentum through velocity fluctuations in the rod gap, and no net mass mixing occurs. [0003] The patent with the publication number CN110828013A discloses an isolating...

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Problems solved by technology

However, this invention cannot realize the real-time measurement of the temperature of the rod bundle sub-channel when collecting the relevant informat...

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