996 resultados para Shock tubes.


Relevância:

100.00% 100.00%

Publicador:

Resumo:

The experimental results for the excited time of the nonequlibrium radiation and the ionization behind strong shock waves are presented. Using an optical multichannel analyzer, InSb infrared detectors and near-free-molecular Langmuir probes, the infrared radiation, the electron density of air and the nonequilibrium radiation spectra at different moments of the relaxation process in nitrogen test gas behind normal shock waves were obtained, respectively, in hydrogen oxygen combustion driven shock tubes.

Relevância:

100.00% 100.00%

Publicador:

Resumo:

"SSD-TDR-62-204. Report no TDR-169 (3230-12)TN-5."

Relevância:

70.00% 70.00%

Publicador:

Resumo:

When a shock wave interacts with a group of solid spheres, non-linear aerodynamic behaviors come into effect. The complicated wave reflections such as the Mach reflection occur in. the wave propagation process. The wave interactions with vortices behind each sphere's wake cause fluctuation in the pressure profiles of shock waves. This paper reports an experimental study for the aerodynamic processes involved in the interaction between shock waves and solid spheres. A schlieren photography was applied to visualize the various shock waves passing through solid spheres. Pressure measurements were performed along different downstream positions. The experiments were conducted in both rectangular and circular shock tubes. The data with respect to the effect of the sphere array, size, interval distance, incident Mach number, etc., on the shock wave attenuation were obtained.

Relevância:

70.00% 70.00%

Publicador:

Resumo:

Keller proposed that a building, a mechanical installation or a body wrapped bya layer of foam plastics may be an efficient means for protection from damage ofblast wave. However, the practical effect was beyond expectation. For example, agunner wearing the foam plastics-padded waistcoat was injured more seriously by theblast wave from a muzzle. Monti took the foam plastics as homogeneous two-phasemedium and analyzed it with the theory of dusty flow. The obtained results showthat the peak pressure behind the reflected shock wave from rigid wall with foamcoat exceeds obviously that without foam coat under the same condition. Gel'fand,Patz and Weaver made experimental observations by means of shock tubes and veri-

Relevância:

70.00% 70.00%

Publicador:

Resumo:

Shock tubes have been used successfully by a number of investigators to study the biological effects of variations in environmental pressures (1,2,3). Recently an unusually versatile laboratory pressurization source became available with the capability of consistently reproducing a wide variety of pressure-time phenomena of durations equal to and well beyond those associated with the detonation of nuclear devices (4). Thus it became possible to supplement costly full-scale field research in blast biology carried out at the Nevada Test Site (5,6) by using an economical yet realistic laboratory tool. In one exploratory study employing pressure pulses of 5 to 10 sec duration wherein the times to max overpressure and the magnitudes of the overpressures were varied, a relatively high tolerance of biological media to pressures well over 150 psi was demonstrated (7). In contrast, the present paper will describe the relatively high biological susceptibility to long duration overpressures in which the pressure rises occurred in single and double fast-rising steps.

Relevância:

70.00% 70.00%

Publicador:

Resumo:

At head of title: Cornell University, Graduate School of Aeronautical Engineering.

Relevância:

70.00% 70.00%

Publicador:

Resumo:

"STL/TR-60-0000-GR310."

Relevância:

70.00% 70.00%

Publicador:

Resumo:

At head of title: Combustion Dynamics Division, Air Force Office of Scientific Research, ARDC, Washington, D. C., File no. AF 18(600)-1332.

Relevância:

70.00% 70.00%

Publicador:

Resumo:

"This work was supported by the Air Research and Development Center, Griffis Air Force Base, New York."

Relevância:

70.00% 70.00%

Publicador:

Resumo:

"Contract AF 18(603)-10, Mechanics Division, Air Force Office of Scientific Research, ARDC, Washington."

Relevância:

70.00% 70.00%

Publicador:

Resumo:

"The experimental study reported here has been performed under the sponsorship of the Fluid Dynamics Branch, Aeronautical Research laboratories of the U.S. Air Force Air Research and Development Command, Contract no. AF 33(616)-6025."

Relevância:

70.00% 70.00%

Publicador:

Resumo:

Mode of access: Internet.

Relevância:

70.00% 70.00%

Publicador:

Resumo:

Mode of access: Internet.

Relevância:

70.00% 70.00%

Publicador:

Resumo:

"Presented at the I.A.S. National Symposium on Hypervelocity Techniques, Denver, Colorado, October 20, 21, 1960."