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Method for predicting bundle vibration of large low-temperature evaporator under two-phase flow effect

A low-temperature evaporator, tube bundle vibration technology, used in vibration testing, testing of machine/structural components, measuring devices, etc.

Inactive Publication Date: 2014-01-15
CHINA GASOLINEEUM ENG
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Problems solved by technology

[0005] (3) The vibration analysis methods in the current standards are all aimed at single-phase flow operating conditions;
[0006] Therefore, in the prior art, there is no method for judging whether the vibration of the equipment tube bundle of the shell-and-tube heat exchanger (such as condenser, evaporator, atomic energy evaporator, etc.) under two-phase flow operation will occur; A complete and feasible method for judging whether the tube bundle of a shell-and-tube heat exchanger vibrates under the action of two-phase flow

Method used

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  • Method for predicting bundle vibration of large low-temperature evaporator under two-phase flow effect
  • Method for predicting bundle vibration of large low-temperature evaporator under two-phase flow effect
  • Method for predicting bundle vibration of large low-temperature evaporator under two-phase flow effect

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Embodiment Construction

[0022] A method for predicting tube bundle vibration of a large cryogenic evaporator under the action of two-phase flow, comprising the following steps:

[0023] Step 1. Calculate the maximum amplitude Y(L2) of the heat exchange tube with simply supported boundary conditions:

[0024] (1) Calculate the vortex shedding frequency according to the following formula:

[0025] f s = St TP V G d

[0026] In the formula:

[0027] St. TP is the Strohal number in the two-phase flow;

[0028] d is the diameter of the heat exchange tube;

[0029] V G is the flow velocity of the two-phase fluid in the pipe gap, in ms, calculated according to the following formula: V G =V TP P(P-d), where, V TP is the average velocity of the two-phase fluid; P is the tube spacing.

[0030] (2) Calculate the maximum amplitude of the heat exchange t...

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Abstract

The invention discloses a method for predicting bundle vibration of a large low-temperature evaporator under the two-phase flow effect. 'whether bundle vibration caused by periodical vortex shedding can occur' is predicted by calculating the maximum amplitude of a heat exchange tube under the condition of simply supported boundary according to the maximum amplitude, meanwhile 'whether bundle vibration caused by turbulence excitation vibration can occur' is predicted by calculating the vibration amplitude of a first vibration mode according to the vibration amplitude, and 'whether bundle vibration caused by instability of fluid elasticity can occur' is predicted by calculating critical cross flow velocity according to flow velocity in a pipe gap of two-phase fluid and the critical cross flow velocity. The method for predicting bundle vibration of the large low-temperature evaporator under the two-phase flow effect can be used for analyzing and calculating vibration of the device bundle of shell-and-tube heat exchangers of a condenser, an evaporator, an atomic energy evaporator and the like under the two-phase flow operation.

Description

technical field [0001] The invention relates to a method for predicting the tube bundle vibration of a large-scale low-temperature evaporator under the action of two-phase flow. Background technique [0002] The existing research on tube bundle vibration analysis of large cryogenic evaporators has the following problems: [0003] (1) The diameter of the large-scale low-temperature evaporator exceeds the applicable scope of my country's GB151 and the US TEMA standard; [0004] (2) The shell side of the low temperature evaporator operates in a two-phase fluid state; [0005] (3) The vibration analysis methods in the current standards are all aimed at single-phase flow operating conditions; [0006] Therefore, in the prior art, there is no method for judging whether the vibration of the equipment tube bundle of the shell-and-tube heat exchanger (such as condenser, evaporator, atomic energy evaporator, etc.) under two-phase flow operation will occur; A complete and feasible s...

Claims

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Application Information

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IPC IPC(8): G01M7/02
Inventor 刘家洪谷侠汤晓勇雒定明张毅蒲黎明王冰谢兵焦建国马先任玲万娟潘建华赵华莱刘牧
Owner CHINA GASOLINEEUM ENG
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