Shock tube experiments are a primary means of obtaining ground test data for the hypersonic regime. Accurate characterization gas is crucial to understanding experimental results. However, flows produced behind shock wave has historically proven challenging. This paper applies methodology calculate shocked properties using experimentally recovered speed profile. Static pressure, pitot and heat ...

The interest in studying the shock tube problem is threefold. From a fundamental point of view, it offers an interesting framework to introduce some basic notions about nonlinear hyperbolic systems of partial differential equations (PDEs). From a numerical point of view, this problem constitutes, since the exact solution is known, an inevitable and difficult test case for any numerical method d...

Shock tube experiments are a cornerstone of investigations into the hypersonic flight environment. However, actual flow through basic shock has not been well characterized in literature, and nonuniformities arising test gases understood. This work produces quasi-one-dimensional analytical methodology for predicting postshock gas based exclusively on experimentally measured history speed down tu...

Homogeneous and inhomogeneous ignition modes of n-heptane were studied using high-speed imaging in a high-pressure shock tube (HPST). n-Heptane, fuel with strong negative temperature coefficient (NTC) behavior, was mixed 4%-21% oxygen argon or nitrogen ignited over wide range (700–1250 K) at elevated pressures (> 10 atm). Ultraviolet (UV) images OH* emission captured through sapphire shock-tube...

This paper focuses on the mathematical modelling required to support the development of new primary standard systems for traceable calibration of dynamic pressure sensors. We address two fundamentally different approaches to realising primary standards, specifically the shock tube method and the drop-weight method. Focusing on the shock tube method, the paper presents first results of system id...

The flow field produced by a shock wave reflecting from a helium gas-liquid interface was investigated using a cryogenic shock tube. Incident and reflected shock waves were observed in the gas; transmitted firstand second-sound shocks were observed in the liquid. Wave diagrams are constructed to compare the data with theoretical wave trajectories. Qualitative agreement between data and theory i...

This is a preliminary study of shock wave attenuation over arrays of cylinder and spheres. Firstly shock wave propagation over a single cylinder was investigated experimentally and numerically. Secondly the result was extended to shock wave attenuation over arrays of cylinders and spheres. The experiment was conducted in a 60 mm X 150 mm diaphragmless shock tube equipped with double exposure ho...

The viscous effects on unsteady shock wave propagation are investigated by numerical solution of the Boltzmann model kinetic equations. The kinetic equations are solved for two unsteady non-equilibrium flow problems, namely, the one-dimensional Riemann problem and a two-dimensional viscous shock-tube. The numerical method comprises the discrete velocity method in the velocity space and the fini...

Detonation of a high-explosive produces shock-blast wave, shrapnel, and gaseous products. While direct exposure to blast is a concern near the epicenter, shock-blast can affect subjects, even at farther distances. When a pure shock-blast wave encounters the subject, in the absence of shrapnels, fall, or gaseous products the loading is termed as primary blast loading and is the subject of this p...