Unsteady Flow Features Across Different Shock/Boundary-Layer Interaction Configurations
| Autor: | Paul J. K. Bruce, James A.S. Threadgill |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Technology
Supersonic wind tunnel MOTION Aerospace Engineering ORGANIZATION 02 engineering and technology PRESSURE 01 natural sciences Compressible flow 0901 Aerospace Engineering 0905 Civil Engineering 010305 fluids & plasmas Physics::Fluid Dynamics Engineering 0203 mechanical engineering 0103 physical sciences Aerospace & Aeronautics SHOCK-INDUCED SEPARATION Engineering Aerospace WAVE STRUCTURE OSCILLATION Physics 020301 aerospace & aeronautics Science & Technology Oscillation Mechanics FLUCTUATIONS Aspect ratio (image) Shock (mechanics) MODEL Unsteady flow Boundary layer Particle image velocimetry SIMULATION LOW-FREQUENCY UNSTEADINESS 0913 Mechanical Engineering |
| Zdroj: | AIAA Journal. 58:3063-3075 |
| ISSN: | 1533-385X 0001-1452 |
| Popis: | An experimental study has been conducted to investigate unsteady flow phenomena observed within various two-dimensional configurations of shock/boundary layer interactions. Six configurations have been tested in Mach 2 flow: ϕ1 = 14◦ and 20◦ compression ramps, and incident shock reflections from ϕ1 = 7◦ , 8 ◦ , 9 ◦ , and 10◦ shock generators; Reynolds numbers in each case are Reθ ≈ 8350. The flow is assessed using an array of fast-response pressure transducers in conjunction with a high-repetition rate PIV system. Development of the mean flow structures early in each interaction is observed to be consistent with the Free Interaction concept. Unsteady wall-pressure energy content at frequencies above those associated with the characteristic low-frequency shock motion also show significant similarities in the vicinity of the shock foot. Results confirm that this low-frequency peak is not associated with a narrow-band forcing mechanism from either upstream or downstream, but rather a characteristic frequency that varies with interaction strength, which describes the flow’s dynamic response. These findings support various models published in literature that have sought to explain the source of low-frequency unsteady shock motion. |
| Databáze: | OpenAIRE |
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