Method for quickly calculating transient thermal stress of thermal stratification pipeline
A fast calculation, thermal stratification technology, applied in the direction of calculation, computer-aided design, design optimization/simulation, etc., can solve the problems of inaccurate calculation of transient thermal stress and inaccuracy of fluid temperature distribution.
Active Publication Date: 2021-04-23
HEBEI UNIV OF TECH
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Problems solved by technology
This method can be used for fast calculation of transient thermal stress of thermally stratified pipelines, and solves the problem in the prior art that the temperature distribution of fluid in the thermally stratified area cannot be accurately determined, resulting in the inability to accurately calculate its transient thermal stress
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Embodiment 1
[0063] The implementation mode is described by taking the surge tube of the pressurized water reactor nuclear power plant as an example. The wave tube is a section of pipeline connecting the reactor cooling system (RCP) of the nuclear power plant, that is, the primary circuit of the nuclear power plant and the voltage stabilizer. During the operation of the nuclear power plant at rated power, the lower part of the pressurizer is the reactor coolant, the top is saturated steam, and the liquid at the bottom is connected to the heat pipe section of the primary circuit through the wave tube. During stable operation, the gas phase and liquid phase in the pressurizer are in a relatively balanced state, so the temperature of water and steam in the pressurizer is the saturation temperature under this pressure, the pressure in the pressurizer is the same as the pressure of the primary circuit, and the pressure of the primary circuit The temperature of the water is lower than the satura...
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The invention relates to a method for quickly calculating transient thermal stress of a thermal stratification pipeline, which comprises the following steps of: dividing a hot zone according to a thermal stratification condition in the thermal stratification pipeline, dividing the hot zone into a plurality of working conditions according to different boundary conditions, and obtaining a convective heat transfer coefficient of each hot zone under each working condition; obtaining green functions of different hot areas under different working conditions; calculating the fluid temperature of each hot zone according to the outer wall temperature measuring point data under the condition that the number of the hot zones divided by the researched pipe section is greater than 2; and calculating the thermal stress of the evaluation path according to the fluid temperature of each hot zone and the Green function corresponding to each hot zone. The method can be used for quickly calculating the transient thermal stress of the thermal stratification pipeline, and the problem that in the prior art, the transient thermal stress cannot be accurately calculated due to the fact that fluid temperature distribution in a thermal stratification area cannot be accurately determined is solved.
Description
technical field [0001] The invention relates to the field of calculation of transient thermal stress of pipelines where thermal stratification occurs, in particular to a method based on the Green's function method / utilizing measuring points on the outer wall to estimate fluid temperature to realize rapid calculation of transient thermal stress. Background technique [0002] Some specific pipelines will have the phenomenon of stratified flow of hot and cold fluids. This phenomenon is called thermal stratification. When thermal stratification occurs, the temperature distribution of the pipe wall will be uneven, which will cause huge bending stress in the piping system. It is easy to cause fatigue damage to the pipeline. Therefore, fatigue monitoring of thermally stratified pipelines is very necessary, and fatigue monitoring requires fast calculation of transient thermal stress. At present, there is finite element analysis method for rapid calculation of pipeline transient the...
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IPC IPC(8): G06F30/18G06F30/23G06F30/28G06F113/08G06F113/14G06F119/08G06F119/14
CPCG06F30/18G06F30/23G06F30/28G06F2113/08G06F2113/14G06F2119/08G06F2119/14
Inventor 高炳军李明泽余雏麟董俊华
Owner HEBEI UNIV OF TECH