Experimental and Numerical Study of Pressure in a Shock Tube

Abstract

This paper presents the behavior of pressure in an air–water shock tube. In this work, high-pressure air (at 100 bar) interacts with water (at 1 atm ∼ 1 bar) through an orifice in a 100 mm constant diameter tube. The experiments are repeated with three different orifice plate diameters of 4, 8, and 15 mm. The variation of pressure during the transient stage is recorded in these experiments and it is found that with increasing orifice diameter, the amplitude of the pressure increases linearly with time when all other conditions are unchanged. The same phenomenon is simulated using the ls-dyna® software using an arbitrary Lagrangian Eulerian (ALE) method to solve the problem numerically. Simulations are made with a range of orifice diameters. The experimental results confirm the validity of the simulations algorithm. The simulations also demonstrated that the pressure behaves linearly with orifice diameter only when orifice diameter is less than 15% of the tube diameter.

Design optimization and dynamic testing of CFRP for helicopter loading hanger

“…This is generally triggered with a burst plate or a high speed valve. In given experiments, shock wave is generated in water by releasing high pressure air through high speed valve [6]. The shock wave propagates through water in the driven section [17].…”

Analysis of pressure drop and blast pressure leakage of passive air blast safety valves: An experimental and numerical study

“…Shock tube experiments and computational fluid dynamics (CFD) simulations have been widely applied to investigate the generation and behavior of shock waves as well as to determine the high speed flow characteristics of different working fluids at different boundary conditions (Kumar and Nedungadi, 2020;Singh et al, 2020;Khawaja et al, 2016;Kim et al, 2017;Rigas and Sklavounos, 2005). As an example, Kumar et al conducted a comprehensive CFD study to determine the effects of various design parameters (i.e.…”

Multiphysics Analysis of CFRP Charpy Tests by varying Temperatures

“…CFRP unlike metals have complex fracture mechanisms such as fiber fracture, fiber separation from interface, and delamination that makes fracture toughness of CFRP a complex phenomenon. Despite many superior properties of CFRP over metals they are susceptible to damages caused by low velocity impact during service that reduces their performance to a great extent [5][6][7][8][9][10][11][12]. Therefore, it is very crucial to understand the variation in fracture toughness of CFRP when subjected to low velocity impact at various temperatures.…”