Effect of Ground on Aerodynamic Performance of a Double-track Supersonic Rocket-sled
The aerodynamic characteristics of the rocket sled are significantly influenced by the ground as the rocket sled moves along the track.To analyze the flow field and force characteristics of the double-track rocket sled,changes in the flow field,time-averaged force and their characteristics in both time and frequency domain are investigated using scale adaptive simulation(SAS)and the dynamic mesh method at a Ma 2.The results show that the reflection of shock waves and compression waves on the ground facilities could lead to 6 extra high-pressure areas on the lower surface of the double-track rocket sled,and 4 of them could change with different reflection positions.The ground environment causes the time-average lift to increase by 9.6 times.The pressure signal and instantaneous aerodynamic force indicate strict periodic oscillation at the same frequency,the amplitude of the lift oscillation is 28.6% of the lift showing a lower drag oscillation.The present findings would contribute to the drag and vibration reduction of the double-track rocket sled.
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