scholarly journals Development and commissioning of the T6 Stalker Tunnel

2021 ◽  
Vol 62 (11) ◽  
Author(s):  
Peter Collen ◽  
Luke J. Doherty ◽  
Suria D. Subiah ◽  
Tamara Sopek ◽  
Ingo Jahn ◽  
...  
Keyword(s):  
Operating Mode ◽  
Shock Tunnel ◽  
Test Facility ◽  
Experimental Conditions ◽  
Free Piston ◽  
High Enthalpy ◽  
Reflected Shock ◽  
Ground Test ◽  
The Uk ◽  
Test Requirements

Abstract The T6 Stalker Tunnel is a multi-mode, high-enthalpy, transient ground test facility. It is the first of its type in the UK. The facility combines the original free-piston driver from the T3 Shock Tunnel with modified barrels from the Oxford Gun Tunnel. Depending on test requirements, it can operate as a shock tube, reflected shock tunnel or expansion tube. Commissioning tests of the free-piston driver are discussed, including the development of four baseline driver conditions using piston masses of either 36 kg or 89 kg. Experimental data are presented for each operating mode, with comparison made to numerical simulations. In general, high-quality test flows are observed. The calculated enthalpy range of the experimental conditions achieved varies from $$2.7\hbox { MJ kg}^{-1}$$ 2.7 MJ kg - 1 to $$115.0\hbox { MJ kg}^{-1}$$ 115.0 MJ kg - 1 . Graphical abstract

Free-flight measurement technique in the free-piston high-enthalpy shock tunnel

2014 ◽  
Vol 85 (4) ◽  
pp. 045112 ◽  
Author(s):  
H. Tanno ◽  
T. Komuro ◽  
K. Sato ◽  
K. Fujita ◽  
S. J. Laurence
Keyword(s):  
Measurement Technique ◽  
Shock Tunnel ◽  
Free Flight ◽  
Free Piston ◽  
High Enthalpy ◽  
Flight Measurement ◽  
High Enthalpy Shock Tunnel

Design and Characterization of the Sandia Free-Piston Reflected Shock Tunnel

2022 ◽  
Author(s):  
Kyle P. Lynch ◽  
Thomas Grasser ◽  
Paul Farias ◽  
Kyle Daniel ◽  
Russell Spillers ◽  
...  
Keyword(s):  
Shock Tunnel ◽  
Free Piston ◽  
Reflected Shock

Experimental Investigation of Nano Ceramic Material Interaction with High Enthalpy Argon under Shock Dynamic Loading

2011 ◽  
Vol 83 ◽  
pp. 66-72 ◽  
Author(s):  
Vishakantaiah Jayaram ◽  
Singh Preetam ◽  
K. P. J. Reddy
Keyword(s):  
Shock Tube ◽  
Dynamic Loading ◽  
Strong Shock ◽  
Ceramic Materials ◽  
Reflected Shock Wave ◽  
Free Piston ◽  
High Pressure And Temperature ◽  
High Enthalpy ◽  
Reflected Shock ◽  
Ar Gas

Indigenously designed and fabricated free piston driven shock tube (FPST) was used to generate strong shock heated test gases for the study of aero-thermodynamic reactions on ceramic materials. The reflected shock wave at the end of the shock tube generates high pressure and temperature test gas (Argon, Ar) for short duration. Interaction of materials with shock heated Ar gas leads to formation of a new solid or stabilization of a material in new crystallographic phase. In this shock tube, the generated shock waves was utilized to heat Ar to a very high temperature (11760 K) at about 40-55 bar for 2-4 ms. We confirmed the phase transformation and electronic structure of the material after exposure to shock by XRD and XPS studies. This high enthalpy gas generated in the shock-tube was utilized to synthesize cubic perovskite CeCrO3from fluorite Ce0.5Cr0.5O2+δoxide. We were able to demonstrate that this ceramic materials undergoes phase transformations with the interaction of high enthalpy gas under shock dynamic loading.

Hypervelocity Flow Simulation

1994 ◽  
Vol 47 (6S) ◽  
pp. S14-S19
Author(s):  
Hans Hornung ◽  
Chihyung Wen ◽  
Patrick Germain
Keyword(s):  
Turbulent Flow ◽  
Flow Simulation ◽  
Shock Tunnel ◽  
Free Piston ◽  
Flow Problems ◽  
Flight Vehicles ◽  
Reflected Shock ◽  
Simulation Techniques

Many of the flow problems associated with flight vehicles designed to reach or return from space can not be solved computationally. It is essential to address them by experiment, in particular, by ground simulation of the flow. The requirements and most successful simulation techniques are described, and their important limitations are discussed. Two selected examples are then presented from the free-piston reflected shock tunnel T5 at Caltech: Dissociating flow over spheres and transition from laminar to turbulent flow on a slender cone.

scholarly journals Non-equilibrium dissociating nitrogen flow over a wedge

1974 ◽  
Vol 64 (4) ◽  
pp. 725-736 ◽  
Author(s):  
D. J. Kewley ◽  
H. G. Hornung
Keyword(s):  
Nitrogen Concentration ◽  
Dissociation Rate ◽  
Shock Tunnel ◽  
Detailed Calculation ◽  
Nitrogen Flow ◽  
Fringe Shift ◽  
Experimental Conditions ◽  
Free Piston ◽  
Shock Curvature ◽  
Good Agreement

Experimental results for dissociating nitrogen flow over a wedge, obtained in a free-piston shock tunnel, are described. Interferograms of the flow show clearly the curvature of the shock wave and the rise in fringe shift after the shock associated with the dissociation. It is shown that the shock curvature a t the tip of the wedge can be used to calculate the initial dissociation rate and that it is a more sensitive indication of the rate than can be obtained from fringe shift measurements under the prevailing experimental conditions. Because the free-stream dissociation fraction can be adjusted in the shock tunnel, the dependence on atomic nitrogen concentration of the dissociation rate can be determined by the shock curvature method. A detailed calculation of the flow field by an inverse method, starting from the measured shock shape, shows good agreement with experiments.

On the Piston Motion of a Free-Piston Shock Tube

1965 ◽  
Vol 16 (4) ◽  
pp. 369-376
Author(s):  
Tzy C. Peng ◽  
Theo. F. Elbert
Keyword(s):  
Shock Tube ◽  
Wave Theory ◽  
Ideal Gas ◽  
Experimental Conditions ◽  
Free Piston ◽  
Test Gas ◽  
Stopping Distance ◽  
Reflected Shock ◽  
Shock Wave Theory ◽  
Shock Reflections

SummaryThe motion of a solid piston between the driver and test gases in a closed shock tube is studied. In particular, the piston stopping distance, i.e. the total length required to bring the piston to a stop, is calculated for various experimental conditions. Before the stop, the moving piston compresses the test gas, at first with its induced shock and then further with its own kinetic energy through the successive shock reflections. Thus, the moving piston can produce a reservoir of compressed gas with higher enthalpy than a shock of similar strength without the piston. Normal shock-wave theory for an ideal gas is used until the first reflected shock meets the piston. The subsequent shock reflections are approximated by a continuous compression in thermodynamic equilibrium. The calculated values for the piston stopping distance are found to compare favourably with the available experimental data, indicating that the approximations used are reasonable. Peak pressure and temperature of the compressed test gas are computed, and the effect of bleeding the gas reservoir through a nozzle is also included.

Sign in / Sign up

Export Citation Format

Share Document