Study on calculation method of temperature field in case of slight internal leakage of thermal boundary valve
In order to study the distribution of temperature field on outer wall of the pipe in case of internal leakage of the valve,valve models with four kinds of defects were artificially designed.Based on the flow,evaporation and condensation and heat transfer models in FLUENT software,valve fluid-heat-solid coupling simulation was carried out,and the distribution law of temperature field with internal leakage was obtained:there is thermal stratification axial and circumferential direction in the distribution of temperature field;With the increase of internal leakage,the downstream temperature field of the valve increases as a whole.Circumferential thermal stratification tends to be flat at 2 times pipe diameter,which can be used as a monitoring point for internal leakage in engineering.The experimental data of temperature field in case of internal leakage and numerical simulation data were compared,and the deviation of temperature field falls within the allowable range for engineering,which verifies that the calculation method can be used for on-line monitoring and detection of thermal boundary valves in engineering practice.
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