A calculation method for the adsorption and capture area of liquid helium cryogenic cryopump in vacuum plume experimental system
A technology of experimental system and calculation method, applied in the direction of calculation, special data processing application, instrument, etc., can solve the problem of inability to accurately calculate the cold plate area of the built-in liquid helium cryogenic pump, so as to avoid the high development cost and clear the principle. , the effect of improving design efficiency
Active Publication Date: 2017-05-17
BEIHANG UNIV
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[0012] In order to solve the above problems, the present invention proposes a calculation method for the adsorption and capture area of the liquid helium cryogenic pump in the vacuum plume experimental system, which solves the problem that the traditional method cannot accurately calculate the cold plate area of the built-in liquid helium cryogenic pump
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[0050] Assume an area of 100m 2 , 200m 2 and 300m 2 Three kinds of cold plate structures, respectively analyze the normal velocity of the cold plate surface, the density distribution and the position of the cold plate as figure 2 shown.
[0051] The analysis shows that when the area of the cold plate is different, the parameters such as the macroscopic velocity of the plume gas at the position of the cold plate are similar within a certain range, such as image 3 shown.
[0052] Then, according to the characteristics of the flow field, the space structure of the cold plate to be designed is segmented and averaged along the axial direction, as follows: image 3 In the manner shown, the cold plate is partitioned into five areas a to e, including backflow collision area a, backflow collision area b, expansion flow collision area c, mainstream side collision area d, and main flow frontal collision area e. Among them, the length of the c-region and the b-region is 0.4L, ...
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The invention provides a method for calculating the adsorption capture area of a liquid helium cryogenic pump of a vacuum plume experimental system. A brand new adsorption capture area model, based on a vacuum plume efficient and high-precision numerical simulation method, of the liquid helium cryogenic pump solves the problem that the cold plate area worked out through a traditional method is too large, and accurate calculation of the area of a helium plate with a built-in cryogenic pump is achieved. According to the method, correction is conducted on the ideal pumping speed calculation formula of the unit area in the Maxwell heat balance theory, a macroscopic movement speed item is added, and the objective movement rule of plume high-speed jet flow is conformed to; according to plume flow field similarity characteristics, the method for segmenting and averaging a liquid helium cryogenic pump cold plate structure along the axis is provided, and the difficulty of integral computation in total pumping speed calculation is avoided. The method is clear in theory, ingenious in through and good in area calculation accuracy and conforms to engineering application, the risk that the development cost is too high due to the fact that the cold plate area obtained through the traditional design method is too large is avoided, and the design efficiency of the vacuum plume effect experimental system is improved.
Description
technical field [0001] The invention belongs to the field of vacuum science and technology. The invention relates to a method for calculating the adsorption and capture area of a liquid helium cryogenic pump in a vacuum plume experimental system, which is mainly used in the scheme design of the vacuum plume corresponding experimental system of an attitude and orbit control engine. Background technique [0002] The vacuum plume effect experimental system is mainly used for aerospace attitude and orbit control engine plume experiments. It can simulate the vacuum plume effect of electric propulsion engines or chemical propulsion engines. In order to effectively simulate the work of engines in vacuum cryogenic environments state, the engine plume test has very strict requirements on the vacuum environment in the cabin, such as extremely low background ambient temperature (below minus 260 degrees), high pumping speed (10 7 L / s), ultra-high environmental vacuum (10 -6 Pa). In ...
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IPC IPC(8): G06F17/50
Inventor 凌桂龙蔡国飙唐振宇贺碧蛟王文龙
Owner BEIHANG UNIV