Chen Ji , Ziqiang Liu, Kui Bai, Feng Li

DOI Number XXX-YYY-ZZZ

Conference Number HiSST 2018_1970864

The aerodynamic damping and buffet response of a hammerhead launch vehicle were tested at the Mach number of 0.8 to 1.2 and angle of attack of 0° and 8°. The model is aeroelastic scaled with scaled configuration and structural dynamic characteristics. The aerodynamic damping of the model vibrating in the first and second free-free bending mode were measured respectively by exciting the model at the corresponding frequency with an electromagnetic shaker. The aerodynamic undamping was found at the second free-free bending mode at Ma=0.9 and AoA=8°. The buffet response was measured using strain gage bridge located at the middle of the model with only flow turbulence exciting. Both first and second free-free bending modes were excited by the flow. At different Mach numbers, the variation of the peak value of the free-free bending response power spectral density can be up to 14.4 times. Although the second-order aerodynamic damping was zero at Ma=0.9 and AOA=8°, it had a limited effect on the second-order dynamic bending response amplitude in this test condition.

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In Categories: High-Speed Aerodynamics and Aerothermodynamics, High-Speed Missions and Vehicles, HiSST 2018, Hypersonic Aerodynamics, Testing and Evaluation
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