| Autor: |
Tomohiro MAMASHITA, Tomotaro MUTO, Keiichi KITAMURA, Satoshi NONAKA, Naofumi Ohnishi |
| Předmět: |
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| Zdroj: |
Transactions of the Japan Society of Aeronautical & Space Science; 2023, Vol. 66 Issue 4, p118-129, 12p |
| Abstrakt: |
To investigate the aerodynamic characteristics of the reusable experimental vehicle "Reusable Vehicle-eXperiment (RV-X)" during a return phase (i.e., at 150-180° angles of attack), numerical calculations were performed on both actual-flight and wind-tunnel-test scales. The authors also validated the simulation results through comparing them with the data of corresponding wind tunnel tests. Especially, at an angle of attack of 180°, the results showed that the absolute axial force value «CA« (i.e., drag working as an aerodynamic brake) under the flight conditions (Re = 9.0 © 106) was approximately 87% smaller than that observed for the wind tunnel conditions (Re = 6.6 © 105). It was discovered that this decrement is caused by a difference between the Reynolds numbers of the wind-tunnel-test and actual-flight scales. A comparison of the visualized flow fields clarified that the flow in the actual-flight scale with the larger Reynolds number does not tend to separate from the vehicle surface. Because of this, the accelerated and expanded flow at the base fillet area of the vehicle formed a significant low-pressure region, which pulled the vehicle in the direction of reducing «CA« (i.e., decreasing aerodynamic braking). [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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