| Pumping speed of cryopump for xenon |
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| 作者姓名： | LING Gui-long WEI Li-jun CAI Guo-biao |
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| 作者单位： | School of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China,School of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China,School of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China |
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| 基金项目： | National Defense Science and Industry Bureau the Sino Russian in Cooperation of Spaceflight |
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| 摘 要： | The xenon pumping speed testing system of the large-diameter external cryopump was designed to meet the plume test requirements for prototype electric propulsion. The flowmeter method was utilized to measure the xenon pumping speed. The test results show that the averaged effective pumping speed of double-cryopumps is 52200L/s, and that of single-cryopump is 27100L/s. The pumping speed ratio of two configurations is 1.93. It can be concluded that the pumping speed has in linear relationship with the number of cryopump, and the coefficient is irrelevant with the gas type. The averaged effective pumping speed of xenon is less than its nominal pumping speed, and the averaged pumping efficiency is 0.83. Under the identical inflow conditions, the averaged effective pumping speed ratio of nitrogen is 0.53, slightly less than the theoretical pumping speed ratio of 0.55. Consequently, it can be concluded that results assessment of large-diameter external cryopump design index can guide the engineering application, showing certain reference significance.
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| 关 键 词： | vacuum plume large-diameter external cryopump xenon pumping speed test |
| 收稿时间： | 2014/1/21 0:00:00 |
Pumping speed of cryopump for xenon |
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| LING Gui-long,WEI Li-jun,CAI Guo-biao.Pumping speed of cryopump for xenon[J].Journal of Aerospace Power,2015,30(7):1731-1736. |
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| Authors: | LING Gui-long WEI Li-jun and CAI Guo-biao |
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| Institution: | School of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China,School of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China and School of Astronautics, Beijing University of Aeronautics and Astronautics, Beijing 100191, China |
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| Abstract: | The xenon pumping speed testing system of the large-diameter external cryopump was designed to meet the plume test requirements for prototype electric propulsion. The flowmeter method was utilized to measure the xenon pumping speed. The test results show that the averaged effective pumping speed of double-cryopumps is 52200L/s, and that of single-cryopump is 27100L/s. The pumping speed ratio of two configurations is 1.93. It can be concluded that the pumping speed has in linear relationship with the number of cryopump, and the coefficient is irrelevant with the gas type. The averaged effective pumping speed of xenon is less than its nominal pumping speed, and the averaged pumping efficiency is 0.83. Under the identical inflow conditions, the averaged effective pumping speed ratio of nitrogen is 0.53, slightly less than the theoretical pumping speed ratio of 0.55. Consequently, it can be concluded that results assessment of large-diameter external cryopump design index can guide the engineering application, showing certain reference significance. |
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| Keywords: | vacuum plume large-diameter external cryopump xenon pumping speed test |
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