Prediction of Shock-Standoff Distance and Entropy Distribution for Forward-Facing Cavity
Gang Wang,
Yanguang Yang,
Xiaowei Ma,
Tao Jiang,
Hongming Gong,
Rongzong Kong
Issue:
Volume 6, Issue 3, June 2018
Pages:
52-61
Received:
4 July 2018
Accepted:
16 July 2018
Published:
9 August 2018
Abstract: Experiments are performed on a cylinder with a forward-facing cavity at M∞ = 10 in the FD-14A shock tunnel. The shock-standoff distance and oscillation characteristics are recorded by a high-speed movie, and the dynamic pressure transducer is used to capture the unsteady signal of cavity base. Based on experimental and numerical results, a prediction method for estimating the shock-standoff distance is proposed. Results of shock-standoff distance and oscillation frequency are obtained for experiments in the shock tunnel. The predicted oscillation frequency is in accordance with experimental results. Furthermore, the relation of shock shape and the entropy increase are combined to obtain the characteristics of entropy distribution. As the shock-shape of flat-nosed cylinders is more liable to be influenced than blunt-nosed cylinders with increasing Mach number, the location of the extreme value moves to the surface as the Mach number increases for flat-nosed cylinders, while it remains the identical location for blunt-nosed cylinders.
Abstract: Experiments are performed on a cylinder with a forward-facing cavity at M∞ = 10 in the FD-14A shock tunnel. The shock-standoff distance and oscillation characteristics are recorded by a high-speed movie, and the dynamic pressure transducer is used to capture the unsteady signal of cavity base. Based on experimental and numerical results, a predicti...
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