| タイトル | Bearing tester data compilation analysis, and reporting and bearing math modeling |
| 本文（外部サイト） | http://hdl.handle.net/2060/19860020733 |
| 著者（英） | Cody, J. C. |
| 著者所属（英） | Spectra Research Systems, Inc. |
| 発行日 | 1986-08-01 |
| 言語 | eng |
| 内容記述 | Integration of heat transfer coefficients, modified to account for local vapor quality, into the 45 mm bearing model has been completed. The model has been evaluated with two flow rates and subcooled and saturated coolant. The evaluation showed that by increasing the flow from 3.6 to 7.0 lbs/sec the average ball temperature was decreased by 102 F, using a coolant temperature of -230 F. The average ball temperature was decreased by 63 F by decreasing the inlet coolant temperature from saturated to -230 F at a flow rate of 7.0 lbs/sec. Since other factors such as friction, cage heating, etc., affect bearing temperatures, the above bearing temperature effects should be considered as trends and not absolute values. The two phase heat transfer modification has been installed in the 57 mm bearing model and the effects on bearing temperatures have been evaluated. The average ball temperature was decreased by 60 F by increasing the flow rate from 4.6 to 9.0 lbs/sec for the subcooled case. By decreasing the inlet coolant temperature from saturation to -24 F, the average ball temperature was decreased 57 F for a flow rate of 9.0 lbs/sec. The technique of relating the two phase heat transfer coefficient to local vapor quality will be applied to the tester model and compared with test data. |
| NASA分類 | MECHANICAL ENGINEERING |
| レポートNO | 86N30205
NAS 1.26:176909
REPT-5350
SRS/STD-PR-535/21
NASA-CR-176909 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/153485 |
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