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NASA Common Research Model Test Envelope Extension With Active Sting Damping at NTF.
| 题名： | NASA Common Research Model Test Envelope Extension With Active Sting Damping at NTF. |
| 作者： | Balakrishna, S.; Rivers, M. B. |
| 关键词： | Angle Of Attack; Buffeting; Computational Fluid Dynamics; Cryogenic Temperature; Damping; Data Bases; High Reynolds Number; Oscillations; Piezoelectric Ceramics; Pitching Moments; Scale Models; Separa |
| 摘要： | The NASA Common Research Model (CRM) high Reynolds number transonic wind tunnel testing program was established to generate an experimental database for applied Computational Fluid Dynamics (CFD) validation studies. During transonic wind tunnel tests, the CRM encounters large sting vibrations when the angle of attack approaches the second pitching moment break, which can sometimes become divergent. CRM transonic test data analysis suggests that sting divergent oscillations are related to negative net sting damping episodes associated with flow separation instability. The National Transonic Facility (NTF) has been addressing remedies to extend polar testing up to and beyond the second pitching moment break point of the test articles using an active piezoceramic damper system for both ambient and cryogenic temperatures. This paper reviews CRM test results to gain understanding of sting dynamics with a simple model describing the mechanics of a sting-model system and presents the performance of the damper under cryogenic conditions. |
| 报告类型： | 科技报告 |
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