Fast Calculation Method of Transient Thermal Stress in Thermally Layered Pipeline
A rapid calculation and thermal stratification technology, applied in calculation, computer-aided design, design optimization/simulation, etc., can solve the problems of inaccurate calculation of transient thermal stress and inaccurate determination of fluid temperature distribution, etc., and achieve thermal stress calculation results The effect of accuracy, accuracy improvement, and fast calculation
Active Publication Date: 2022-06-17
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 embodiment is described by taking the surge tube of the pressurizer in a 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 bottom liquid is connected to the primary loop heat pipe section through the wave tube. During stable operation, the gas phase and liquid phase in the regulator are in a relatively balanced state, so the temperature of the water and steam in the regulator is the saturation temperature under the pressure, the pressure in the regulator is the same as the pressure in the primary circuit, while the temperature in the primary circuit is the same as the pressure in the primary circuit. The temp...
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The present invention is a fast calculation method for the transient thermal stress of a thermally stratified pipeline. The method includes the following content: divide the thermal zone according to the thermal stratification in the thermally stratified pipeline, divide it into several working conditions according to the different boundary conditions, and obtain each The convective heat transfer coefficient of each hot zone under working conditions; obtain the Green's function under different working conditions in different hot zones; for the case where the number of hot zones divided by the studied pipe section is greater than 2, the fluid temperature of each hot zone is calculated from the data of the outer wall temperature measurement points ; According to the fluid temperature of each thermal zone and the Green's function corresponding to each thermal zone, calculate the thermal stress of the evaluation path. The method can be used for fast calculation of the transient thermal stress of the thermally stratified pipeline, and solves the problem in the prior art that the temperature distribution of the fluid in the thermally stratified area cannot be accurately determined, resulting in the inability to accurately calculate the transient thermal stress.
Description
technical field [0001] The invention relates to the field of transient thermal stress calculation of pipelines where thermal stratification occurs, in particular to a method for rapidly calculating transient thermal stress based on Green's function method / using outer wall measuring points to estimate fluid temperature. Background technique [0002] In some specific pipelines, the phenomenon of stratified flow of cold and hot fluids occurs, which is called thermal stratification. When thermal stratification occurs, the temperature distribution of the pipe wall is uneven, which will cause huge bending stress in the pipe system. It is easy to cause fatigue damage to the pipeline. Therefore, it is very necessary to carry out fatigue monitoring of thermally stratified pipelines, and fast calculation of transient thermal stress is required for fatigue monitoring. At present, there is a finite element analysis method to quickly calculate the transient thermal stress of the pipelin...
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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