Ignition and combustion of ferrous metals in high pressure, high velocity, gaseous oxygen

1979 ◽  
Vol 1 (1) ◽  
pp. 61-76 ◽  
Author(s):  
Charles E. Bates ◽  
James E. Wren ◽  
Raymond Monroe ◽  
C. D. Pears
Keyword(s):  
High Pressure ◽  
High Velocity ◽  
Gaseous Oxygen ◽  
Ferrous Metals ◽  
Ignition And Combustion

Premixing rocket engine injectors for high pressure gaseous oxygen and hydrogen

1999 ◽  
Author(s):  
William Knuth ◽  
Daniel Gramer ◽  
Christopher St. Clair
Keyword(s):  
High Pressure ◽  
Rocket Engine ◽  
Gaseous Oxygen

Shock Synthesis of Nanocrystalline High -Pressure Phases in Semiconductors by High-Velocity Thermal Spray

2000 ◽  
Vol 638 ◽  
Author(s):  
R. Goswami ◽  
J. Parise ◽  
H. Herman ◽  
S. Sampath ◽  
R. Gambino ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Pressure ◽  
Thermal Spray ◽  
High Velocity ◽  
Metastable Phase ◽  
High Energy ◽  
Metastable Phases ◽  
Transmission Electron ◽  
Average Size

AbstractShock synthesis of nanocrystalline Si, Ge and CdTe was accomplished using high- velocity thermal spray. Si or Ge powders were injected into a high energy flame, created by a thermal spray gun, where the particles melt and accelerate to impact on a substrate. The shock wave generated by the sudden impact of the droplets propagated through the underlying deposits, which induces a phase transition to a high pressure form. The decompression of the high-pressure phase results in the formation of several metastable phases, as evidenced by transmission electron microscopy and x-ray diffraction studies. The peak pressure is estimated to be ≈23GPa with a pulse duration of 1-5 ns. Transmission electron microscopy revealed that the metastable phases of Si with a size range of 2 to 5 nm were dispersed within Si-I. In Ge, a metastable phase, ST-12, was observed. This is a decompression product of Ge-II which possesses the β-Sn type of structure. In the case of CdTe, a fine dispersion of hexagonal CdTe particles, embedded in cubic-CdTe with an average size of 2 nm was obtained.

Preliminary Study on the High-Pressure Equation of State of Concrete

2011 ◽  
Vol 261-263 ◽  
pp. 161-165
Author(s):  
Chu Jie Jiao ◽  
Guo Ping Jiang ◽  
Le Gao
Keyword(s):  
High Pressure ◽  
Equation Of State ◽  
High Velocity ◽  
Wave Speed ◽  
Volume Strain ◽  
Pressure Equation ◽  
Gas Gun ◽  
Shock Hugoniot ◽  
Preliminary Study ◽  
Relationship Of

The shock Hugoniot relationship of concrete was studied based on concrete test subjected to the high-velocity impacting loading by one stage gas gun. The P-U(pressure-partical speed) shock Hugoniot relationship curve of concrete was gained from the D-U(shocking wave speed-partical speed) curve of concrete, and the equation of volume pressure P and volume strain v was put forward according to the example analysis. Moreover, based on the polynomial Grьneisen equation, the parameters of high-pressure equation of state of concrete were got by fitting the test date, and the theoretical values from the equation matched well with the experimental ones.

High Pressure Nano-Destruction of a Brittle Polymeric Materials Surface

2013 ◽  
Vol 199 ◽  
pp. 667-671
Author(s):  
Anatoli Svirydzionak ◽  
Sergey Chizhik ◽  
Mikhail Ihnatouski
Keyword(s):  
High Pressure ◽  
High Velocity ◽  
Water Drop ◽  
Polymeric Materials ◽  
Cyclic Loads ◽  
Atomic Force ◽  
Jet Impact ◽  
Brittle Polymers ◽  
Plastic Character ◽  
Velocity Water

The regularity of the erosion wear of a surface of a brittle polymeric material under the conditions of high-pressure (high-velocity) water-jet impact was examined using the atomic-force microscope. Investigations results proved that the elementary mechanism of erosive failure of brittle polymers in response to pressure and cyclic loads at micro and nanolevel may have brittle character, as well as elastoplastic and plastic character under severer regimes. The process of hardening of the fine (nanolevel) superficial layers of PMMA material has been determined in conditions of high-velocity water-drop loading.

Numerical Simulation of Oblique Collision of Flier Plate

2013 ◽  
Vol 767 ◽  
pp. 192-195
Author(s):  
Akio Kira ◽  
Hideki Hamashima ◽  
Kazuyuki Hokamoto ◽  
Masahiro Fujita ◽  
Shigeru Itoh
Keyword(s):  
Numerical Simulation ◽  
High Pressure ◽  
High Velocity ◽  
High Explosive ◽  
Collision Process ◽  
Oblique Collision ◽  
New Device ◽  
The Difference ◽  
Metal Jet ◽  
Metal Block

The metal jet that is flowed out by the oblique collision between a metal flier plate and a metal block becomes a high velocity. We have been developing the device that makes a material extremely high pressure by using the metal jet. The flier plate of the previous device had been accelerated by using a high explosive. There were several problems in the collection and analysis of the material that had been made the high pressure. Therefore we thought up the new device of which the flier plate was accelerated by a powder gun. The collision process was examined by a numerical simulation because the collision process of the flier plate of this device differs from that of the previous device. LS-DYNA was used for a numerical simulation and the difference of the collision process was clarified.

scholarly journals Mechanism Elucidation of High-Pressure Generation in Cellular Metal at High-Velocity Impact

Metals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 128
Author(s):  
Masatoshi Nishi ◽  
Shigeru Tanaka ◽  
Akihisa Mori ◽  
Matej Vesenjak ◽  
Zoran Ren ◽  
...  
Keyword(s):  
High Pressure ◽  
Impact Loading ◽  
High Velocity ◽  
High Pressures ◽  
Direct Impact ◽  
High Velocity Impact ◽  
Velocity Impact ◽  
Base Materials ◽  
Cellular Metal ◽  
Cellular Metals

Cellular metals exhibit diverse properties, depending on their geometries and base materials. This study investigated the mechanism of high-pressure generation during the high-velocity impact of unidirectional cellular (UniPore) materials. Cubic UniPore copper samples were mounted on a projectile and subjected to impact loading using a powder gun to induce direct impact of samples. The specimens exhibited a unique phenomenon of high-pressure generation near the pores during compression. We elucidate the mechanism of the high-pressure phenomenon and discuss the pore geometries that contribute to the generation of high pressures.

Study of radial burning of holes in titanium shells of high-pressure tanks with oxygen containing gas

2020 ◽  
pp. 92-99
Author(s):  
Nikolay N. TUPITSYN
Keyword(s):  
Experimental Study ◽  
High Pressure ◽  
Hole Size ◽  
Engineering Systems ◽  
Initial Value ◽  
Gaseous Oxygen ◽  
Orifice Area ◽  
Emergency Situations ◽  
Pressure Flows ◽  
Increased Pressure

The paper presents the results of the experimental study of radial burning of holes in titanium samples simulating a fragment of the shell of a high-pressure tank filled with gaseous oxygen or oxygen-containing gas. The tests revealed the possibility of a large increase in the orifice area (140–2 250 times compared with the initial value) as a result of the burning of small through-holes when oxygen-containing gas of the increased pressure flows through them and allowed us to determine the apparent radial burning rate at various oxygen concentrations. The proposed mathematical dependence of the hole size in the titanium shell after their radial burning on the process parameters may be of interest for the analysis of processes occurring in engineering systems in case of some off-nominal and emergency situations. Key words: radial burning of holes, titanium tank, oxygen-containing gas, off-nominal and emergency situations.

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