Experimental investigation of shock wave diffraction over a single- or double-sphere model

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• 作者：L. T. Zhang ; T. H. Wang ; L. N. Hao ; B. Q. Huang ; W. J. Chen ; H. H. Shi
• 关键词：Shock wave ; Double ; sphere model ; Unsteady drag ; Drag coefficient ; Interference
• 刊名：Shock Waves
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：27
• 期：1
• 页码：97-107
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Engineering Thermodynamics, Heat and Mass Transfer; Fluid- and Aerodynamics; Engineering Fluid Dynamics; Thermodynamics; Acoustics; Condensed Matter Physics;
• 出版者：Springer Berlin Heidelberg
• ISSN：1432-2153
• 卷排序：27

文摘

In this study, the unsteady drag produced by the interaction of a shock wave with a single- and a double-sphere model is measured using imbedded accelerometers. The shock wave is generated in a horizontal circular shock tube with an inner diameter of 200 mm. The effect of the shock Mach number and the dimensionless distance between spheres is investigated. The time-history of the drag coefficient is obtained based on Fast Fourier Transformation (FFT) band-block filtering and polynomial fitting of the measured acceleration. The measured peak values of the drag coefficient, with the associated uncertainty, are reported.