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Gas-liquid two phase thermal-engineering experiment heat loss calibration method and calibration device

A thermal experiment and calibration device technology, applied in the direction of material thermal development, etc., can solve the problems of underestimating heat loss, overestimating heat loss, inaccuracy, etc., to improve accuracy and reliability, and the evaluation value is reliable and More simple and convenient, simple and accurate calibration process

Inactive Publication Date: 2015-12-09
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
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  • Application Information

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Problems solved by technology

This method is obviously an approximate treatment, which does not fully conform to the physical reality and is not accurate, especially when using this average method under small flow conditions, it underestimates the heat loss, while using this average method under high flow conditions method, overestimated the heat loss
In the prior art, there is also a lack of calibration devices for heat loss in vapor-liquid two-phase thermal experiments

Method used

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  • Gas-liquid two phase thermal-engineering experiment heat loss calibration method and calibration device

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Embodiment 1

[0035] In the thermal experiment, the two ends of the experimental section 1 are generally connected in the experimental loop through pipelines, and the calibration device of the present invention calibrates the heat loss of the experimental section 1 .

[0036] like figure 1 As shown, the calibration device for the heat loss of the vapor-liquid two-phase thermal experiment includes the experimental section 1 connected in the experimental circuit, the preheater 2 for heating the fluid, the wall temperature measuring device 6 for measuring the outer wall of the experimental section 1, The flowmeter 3 that measures the flow rate of the fluid passing through the experimental section 1; the flowmeter 3, the preheater 2, and the experimental section 1 are connected in series in sequence, and the preheater 2 is connected to the inlet of the experimental section 1, the outlet of the experimental section 1 and the The flowmeters 3 are all connected to the experimental loop, and the fl...

Embodiment 2

[0048] The calibration method for the heat loss of the vapor-liquid two-phase thermal experiment also includes the steps of determining the amount of heat loss in the two-phase thermal experiment, specifically including the following steps:

[0049] S41. In the two-phase thermal experiment, measure the temperature of the outer wall of the experimental section 1; the aforementioned two-phase thermal experiment refers to a formal thermal experiment conducted by introducing a vapor-liquid two-phase fluid;

[0050] S42, Substituting the outer wall temperature of the experimental section 1 measured in step S41 into the functional relationship between the wall temperature Tw obtained in step S3 and the heat loss Qloss to calculate the heat loss, or according to the experimental section 1 measured in step S41 Find the corresponding amount of heat loss from the relationship diagram obtained in step S3 for the temperature of the outer wall. If only the functional relational expression ...

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Abstract

The present invention discloses a gas-liquid two phase thermal-engineering experiment heat loss calibration method and calibration device, the device includes a preheater connected between an experiment section inlet and an experimental loop, a wall temperature measurement device on the experiment section outer wall and a flowmeter; the experiment section inlet and an experiment section outlet are provided with temperature measuring and pressure measuring devices, and the flowmeter is arranged between the experiment section inlet and the experimental loop, or the experiment section outlet and the experimental loop. The calibration method is as follows: first, the power of the preheater is adjusted for control of thermal-engineering experiment parameters of an introduced single-phase fluid to achieve the purpose containing two-phase formal experiment wall temperature range, a relationship formula or a relationship diagram of wall temperature experiment section and heat dissipation amount can be obtained by fitting, the wall temperature is measured in a formal two-phase thermal-engineering experiment, and the heat dissipation amount can be determined according to the relationship formula or the relationship diagram, so that experiment section heat loss amount can be determined under the conditions of gas-liquid two phase experimental conditions, and a support is provided for accurate determination of the flow working medium heat absorption amount and acquisition of reliable experimental data, and the two-phase thermal-engineering experiment accuracy and reliability can be enhanced.

Description

technical field [0001] The invention relates to the technical field of vapor-liquid two-phase thermal experiments, in particular to a calibration method and a calibration device for heat loss in vapor-liquid two-phase thermal experiments. Background technique [0002] Vapor-liquid two-phase flow exists widely in industrial fields such as energy and power, nuclear energy, refrigeration, petrochemical, and aerospace. The process of scientific research and industrial design often involves vapor-liquid two-phase thermal experiments. How to determine the effective heat absorption of fluid in thermal experiments is the key to obtaining accurate experimental results, and it is also the basis for further research on flow heat transfer laws and physical mechanisms. Therefore, the research on heat balance analysis methods of thermal experiments is of great significance for improving experimental procedures, obtaining accurate experimental results, and mastering accurate experimental r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/20
Inventor 徐建军鲍伟谢添舟陈炳德黄彦平
Owner NUCLEAR POWER INSTITUTE OF CHINA
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