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A Method for Identifying the Starting Point of Density Wave Fluctuation in Parallel Channels

A technology of channel density and identification method, which is applied in the field of identification of the starting point of density wave pulsation of parallel channels, can solve the problems of low efficiency and inability to realize multi-working conditions and large-scale calculations, and achieve the effect of fast efficiency and high recognition accuracy

Active Publication Date: 2018-06-12
NUCLEAR POWER INSTITUTE OF CHINA
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  • Application Information

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Problems solved by technology

This method requires technicians to manually identify whether density wave pulsation occurs through the flow change curve after each power change, which is extremely inefficient and cannot achieve multi-working conditions and large-scale calculations

Method used

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  • A Method for Identifying the Starting Point of Density Wave Fluctuation in Parallel Channels

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Experimental program
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Effect test

Embodiment 1

[0025] Such as figure 1 Shown is a parallel channel density wave pulsation starting point identification method, comprising the following steps:

[0026] A. On the basis of the initial thermal hydraulic parameters and heating power, power disturbance is implemented on the channel;

[0027] B. Confirm the divergence of the flow pulsation curve after implementing power disturbance;

[0028] C. If the flow pulsation curve diverges, reduce the heating power; if the flow pulsation curve does not diverge, increase the heating power and reconfirm the divergence of the flow pulsation curve until the flow pulsation curve diverges;

[0029] D. Steps B and C of multiple cycles are used to identify the starting point of density wave pulsation. In multiple cycles, the enhancement of the previous cycle is greater than the enhancement of the next cycle, and the decrement of the cycle is the enhancement of this cycle.

[0030] The initial heating power is less than the starting point of the...

Embodiment 2

[0032] In this embodiment, on the basis of Embodiment 1, the discriminant method for the divergence of the flow pulsation curve is refined, that is, the method for confirming the divergence of the flow pulsation curve in step B is:

[0033] B1. After the time interval dT after the power disturbance is implemented, two time steps dt are continuously taken;

[0034] B2. Obtain the maximum flow and minimum flow of each channel within the two time steps dt, the maximum flow in the first time step is Max1, the minimum is Min1, and the maximum flow in the second time step is Max2, the minimum value is Min2;

[0035] B3. Identify the density wave pulsation according to the result of step B2.

[0036] This method is suitable for multiple parallel heating channel structures with constant inlet total flow. Based on the characteristics of divergent flow pulsation, whether it diverges is judged by technical methods in continuous time.

[0037] The time interval dT is 1 second to 2 secon...

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Abstract

The invention discloses a method for identifying the starting point of density wave pulsation of a parallel channel, which comprises the following steps: A. implementing power disturbance to the channel on the basis of initial thermal-hydraulic parameters and heating power; B. confirming the flow pulsation curve after implementing power disturbance C. If the flow pulsation curve diverges, decrement the heating power; if the flow pulsation curve does not diverge, increase the heating power and reconfirm the divergence of the flow pulsation curve until the flow pulsation curve diverges; D. Steps B and C of multiple cycles are used to identify the starting point of density wave pulsation. In multiple cycles, the enhancement of the previous cycle is greater than the enhancement of the next cycle, and the decrement of the cycle is the enhancement of this cycle. In this method, the heating power is incremented or decremented on the basis of the initial thermal hydraulic parameters and heating power, and finally the starting point of the density wave fluctuation is found. The recognition accuracy is high and can be realized through the program, and the efficiency is fast.

Description

technical field [0001] The invention relates to the field of reactor thermal hydraulic research, in particular to a method for identifying the starting point of density wave pulsation of a parallel channel. Background technique [0002] The research on the mechanism of thermal-hydraulic characteristics of reactors is the key to the development of reactors, and the problem of flow instability is an important problem that needs to be faced in thermal-hydraulic research. A large number of experiments and theoretical calculations have been carried out to analyze the problem. [0003] At present, there are many programs that can be used to analyze the flow instability of parallel channels, and most of them use the time domain analysis method, that is, by calculating the flow change curves of parallel channels at different power levels to manually judge whether density wave fluctuations occur: if the flow change curve If it is convergent, density wave pulsation does not occur. It...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N11/04
CPCG01N11/04
Inventor 王艳林鲁晓东袁德文黄彦平
Owner NUCLEAR POWER INSTITUTE OF CHINA
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