Method for calculating turbulence buffeting responses of heat exchanger

Abstract

The invention discloses a method for calculating turbulence buffeting responses of a heat exchanger. The method comprises steps as follows: a flow field of a secondary side of the heat exchanger is calculated by thermotechnical hydraulic system analysis software to obtain parameters of flow fields, distributed along a heat exchange pipe, of flow on the secondary side; on the basis of the parameters of the flow fields and the structure parameters of the heat exchange pipe, whether the parameters of the flow fields belong to a first preset range and a second preset range is judged; if the parameters of the flow fields belong to the first preset range and the second preset range, a reference equivalent power spectral density function of exciting force is calculated by means of formula (1)-(6); a root-mean-square value of the turbulence buffeting vibration responses is calculated by means of the random vibration theory based on a density function, flow-induced vibration evaluation is performed by means of the root-mean-square value, and the technical effects of more reasonable input and more accurate analysis result during calculation analysis of turbulence buffeting responses of the heat exchanger are achieved.

Description

technical field [0001] The invention relates to the field of reactor structural mechanics, in particular to a calculation method for turbulent buffeting response of a heat exchanger. Background technique [0002] There are a large number of heat exchange devices in nuclear energy, thermal power, and petrochemical equipment. The problem of flow-induced vibration of these heat exchange devices during operation has been puzzling the engineering field. So far, the flow-induced vibration mechanisms recognized by the academic community are "vortex shedding", "turbulent flow chattering", "fluid elastic instability", "acoustic resonance" and so on. Among them, since the effect of turbulent buffeting is long-term and unavoidable, it is necessary to calculate the turbulent buffeting response in the design stage of heat exchangers such as nuclear steam generators for wear and fatigue analysis to predict the long-term operation of heat exchangers security. [0003] The turbulent chat...

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Problems solved by technology

[0021] The invention provides a method for calculating the turbulent chattering response of a heat exchanger, which solves the technical problems of unreasonable analysis input and high conservatism in the existing flow-induced vibration analysis method of a heat exchanger, resulting in inaccurate analysis results , the PSD envelope spectrum of the new two-phase flow excitation force is obtained, the new envelope spectrum is more suitable for the calculation of the two-phase flow turbulent buffeting of the tube bundle than the envelope spectrum based on the single-phase flow, and at the same time, to a certain extent It reduces the excessive conservatism of the existing two-phase flow envelope spectrum, and realizes the technical effect that the calculation and analysis input of the turbulent flow chattering response of the heat exchanger is more reasonable, and the analysis results are more accurate.

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