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Hotfire testing of a SSME HPOTP with an annular hydrostatic bearing

机译:带环形静压轴承的SSME HPOTP的热火测试

摘要

A new fluid film bearing package has been tested in the Space Shuttle Main Engine (SSME) High Pressure Oxygen Turbopump (HPOTP). This fluid film element functions as both the pump end bearing and the preburner pump rear wear ring seal. Most importantly, it replaces a duplex ball bearing package which has been the primary life limiting component in the turbopump. The design and predicted performance of the turbopump are reviewed. Results are presented for measured pump and bearing performance during testing on the NASA Technology Test Bed (TTB) Engine located at MSFC. The most significant results were obtained from proximity probes located in the bearing bore which revealed large subsynchronous precession at ten percent of shaft speed during engine start which subsided prior to mainstage power levels and reappeared during engine shutdown at equivalent power levels below 65% of nominal. This phenomenon has been attributed to rotating stall in the diffuser. The proximity probes also revealed the location of the bearing in the bore for different operating speeds. Pump vibration characteristics were improved as compared to pumps tested with ball bearings. After seven starts and more than 700 seconds of testing, the pump showed no signs of performance degradation.
机译:一种新的液膜轴承组件已经在航天飞机主机(SSME)高压氧气涡轮泵(HPOTP)中进行了测试。该流体膜元件既用作泵端轴承,又用作预燃器泵后磨损环密封件。最重要的是,它替代了双涡轮机球轴承组件,后者已成为涡轮泵的主要使用寿命限制组件。回顾了涡轮泵的设计和预测性能。给出了在MSFC上的NASA技术测试台(TTB)发动机上进行测试时测得的泵和轴承性能的结果。最显着的结果是通过位于轴承孔中的接近探针获得的,该探针在发动机启动期间以轴速度的百分之十显示出较大的次同步进动,该次同步进动在主要功率水平之前消退,并在发动机停机期间以低于标称功率65%的等效功率水平出现。该现象归因于扩散器中的旋转失速。接近探针还显示了不同工作速度下轴承在孔中的位置。与使用球轴承测试的泵相比,泵的振动特性得到了改善。经过七次启动和700秒钟的测试后,泵没有出现性能下降的迹象。

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