대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)
- 제22권5호
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- Pages.640-650
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- 1998
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- 1226-4881(pISSN)
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- 2288-5324(eISSN)
DOI QR Code
회전날개주위 분자천이유동에 관한 수치해석적 연구
A numerical study on the molecular transition flow for the rotating blades
- 발행 : 1998.05.01
초록
Pumping performances of a helical molecular drag dump(MDP) and of a radial MDPs are numerically analyzed by using the direct simulation Monte Carlo (DSMC) method. A helical- and radial-MDP have rotating pumping channels cut on a cylinder and on a disk, respectively. For a helical MDP, the present results agree quantitatively with the previously known numerical results. For radial MDPs, both of the Type 1 (having pumping channels cut on the stationary disk) and of the Type 2 (having pumping channels cut on the rotating disk) are analyzed to predict their performances for various parameters, i.e., the radius of curvature center of the channel wall, the depth of the channel, the clearance between housing and disk, and the rotating speed. The results show that the performance of the Type 2 is superior to that of the Type 1, and that for all types the pumping efficiency decreases as the clearance increases. Also, the radial type MDP has larger leakage losses in the direction of pumping channel than does the helical one.
키워드