Device and method for measuring cavitation distribution of rod beam flow channel sub-channel

Abstract

The invention discloses a rod beam flow channel sub-channel cavitation distribution measuring device and method. The device comprises a flow channel frame; the rod bundle assembly is arranged in the flow channel frame, the rod bundle assembly comprises a plurality of rod bundle elements, and a flow channel with a certain gap is defined by the rod bundle elements and serves as a sub-channel; wherein one of the rod bundle elements is a movable rod, and the rest of the rod bundle elements are fixed rods; the first driving module is used for driving the moving rod to rotate around the central axis of the moving rod and / or move up and down in the axis direction of the moving rod; the void fraction distribution detection module is mounted on the moving rod, and the void fraction distribution detection module is used for measuring void fraction distribution in the gas-liquid two-phase flow in the sub-channel; and the second driving module is used for driving the void share distribution detection module to move along the radial direction of the moving rod. According to the invention, accurate measurement of void fraction distribution in the sub-channel is realized, and the method has important significance for safety analysis of a reactor.

Description

technical field [0001] The invention relates to the technical field of nuclear reactor thermal technology, in particular to a device and method for measuring cavitation distribution in sub-channels of a rod bundle flow channel. Background technique [0002] In nuclear power systems, fuel rods are usually fixed in the reactor core in the form of rod bundles. Gas-liquid two-phase flow may appear in the reactor core, and the void fraction is the most basic flow parameter of the gas-liquid two-phase flow, which directly affects the flow heat transfer and boiling critical crisis. Therefore, the void fraction distribution in the rod bundle sub-channels The fine measurement of is very important for reactor safety analysis. [0003] The probe-type cavitation fraction sensor is one of the most widely used instruments for cavitation fraction measurement of gas-liquid two-phase flow. It is simple to manufacture, low in cost, stable in operation, and high in measurement accuracy. Mode...

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Problems solved by technology

[0004] The structure of the rod bundle is complex. Due to the shielding effect of the rod bundle, it is difficult for the probe-type cavitation fraction sensor to collect fine data of the cavitation fraction distribution in the sub-channels.

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