Accurate test method for non-condensable gas volume of gravity heat pipe
A technology of gravity heat pipe and testing method, which is applied in the direction of volume measuring instrument/method, liquid/fluid solid measurement, measuring device, etc., which can solve the problems of limited size of temperature sensor, large calculation error, and inability to identify non-condensable gas, etc. Achieve the effects of small circulation flow of working fluid, reduce error and improve measurement accuracy
Active Publication Date: 2017-12-08
BEIJING INST OF SPACECRAFT SYST ENG
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Problems solved by technology
[0006] 1) Due to the limited size of the temperature sensor itself, the distance between two adjacent temperature sensors on the condensation section is too sparse. If there is a small amount of non-condensable gas, the temperature measuring point cannot recognize the existence of non-condensable gas, resulting in large calculation errors;
[0007] 2) In the non-condensable gas calculation formula, the non-condensable gas channel cross-sectional area A is measured directly using the heat pipe inner cavity cross-sectional area, ignoring the fact that the liquid working fluid adheres to the heat pipe inner cavity and causes the non-condensable gas channel cross-sectional area A to actually decrease. resulting in large calculation errors
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[0022] See attached figure 1 , Accurate test method of non-condensable gas in gravity heat pipe, it includes the following steps:
[0023] Step A: Put the gravity heat pipe into the vacuum chamber 1 vertically, the end of the reservoir 14 of the gravity heat pipe is downward, the upper part of the pipeline 15 of the gravity heat pipe is attached to the cold plate 9 in the vacuum chamber 1, and is opposite to the cold plate 9 The part of the attached gravity heat pipe is the condensation section, and the rest of the gravity heat pipe is the evaporation saturation section;
[0024] Step B: After standing for a period of time, make the liquid working fluid adsorbed on the inner wall of the gravity heat pipe 15 flow into the accumulator 14 completely under the action of gravity, and evacuate the vacuum chamber 1, and the vacuum degree is better than 1.33×10 -3 Pa;
[0025] Step C: Set the working temperature according to the working fluid in the gravity heat pipe. Under the condition th...
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The invention belongs to the technical field of fluid circuit ground tests, and in particular relates to a method for testing the volume of noncondensable gas. The method for accurately testing the amount of non-condensable gas in a gravity heat pipe comprises the following steps: Step A: vertically place the gravity heat pipe in a vacuum chamber (1), and connect the upper part of the pipeline (15) of the gravity heat pipe to the vacuum chamber (1) The cold plate (9) is bonded; step B: after standing for a period of time, vacuumize the vacuum chamber (1); step C: lower the gravity heat pipe to the set temperature through the cold plate (9); at the same time, the gravity heat pipe and the vacuum chamber (1) Perform radiation heat exchange; step D: when the temperature of the gravity heat pipe is balanced, the infrared thermometer (7) collects the temperature of the temperature measuring point on the gravity heat pipe, and calculates the amount of non-condensable gas. The invention reduces measurement errors and improves calculation accuracy.
Description
Technical field [0001] The invention belongs to the technical field of fluid circuit ground testing, and specifically relates to a method for testing the amount of non-condensable gas. Background technique [0002] The gravity heat pipe is composed of a liquid reservoir and a connecting pipeline, which is filled with non-condensable gas and liquid working fluid; GB / T14813-2008 "Test Method for Heat Pipe Life" introduces the test method for the amount of non-condensable gas in the gravity heat pipe. It specifies the type of temperature sensor used in the test, the location of the measuring point, and the calculation of the amount of non-condensable gas: [0003] [0004] Where: n is the amount of non-condensable gas in mol; P v,e Is the saturated vapor pressure of the evaporation section, in Pa; P v Is the average vapor partial pressure of the non-condensable gas section, in Pa; A is the cross-sectional area of the non-condensable gas channel of the specimen, that is, the cross-se...
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IPC IPC(8): G01F22/02
Inventor 苗建印王录张红星何江
Owner BEIJING INST OF SPACECRAFT SYST ENG