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A Numerical Simulation on the Process of Diaphragm Opening in Shock Tube Flows  

Shin, Choon-Sik (안동대학교 기계공학과)
Jeong, June-Chang (국방기술품질원)
Suryan, Abhilash (안동대학교 기계공학과)
Kim, Heuy-Dong (안동대학교 기계공학과)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.13, no.1, 2009 , pp. 27-33 More about this Journal
Abstract
Shock tube flow measurement has been often hampered a finite opening time of diaphragm, but there is no systematic work to investigate its effect on the shock tube flow. In the present study, both the experimental and computational works have been performed on the shock tube flows at low pressure ratios. The computational analysis has been performed using the two-dimensional, unsteady, compressible Navier-Stokes equations, based upon a TVD MUSCL finite difference scheme. It is known that the present computational results reproduce the experimental data with good accuracy and simulate successfully the process of diaphragm opening as a function of time. The concept of an imaginary center is introduced to quantify the non-centered expansion wave due to a finite opening time of diaphragm. The results obtained show that the diaphragm opening time is reduced as the initial pressure ratio of shock tube increases, leading to the effect of a finite opening time of diaphragm to be more remarkable at low pressure ratios.
Keywords
Compressible Flow; Shock Tube; Unsteady Flow; Shock Wave; Non-centered Expansion Wave;
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