Shock wave source for generating a short initial pressure pulse

1991 ◽  
Vol 89 (5) ◽  
pp. 2487-2487
Author(s):  
Helmut Reichenberger ◽  
Rudolf Schsittenhalm
Keyword(s):  
Shock Wave ◽  
Pressure Pulse ◽  
Initial Pressure ◽  
Wave Source

The Numerical Modeling of Spherical Explosion in the Foam

2016 ◽  
Vol 11 (1) ◽  
pp. 60-65 ◽  
Author(s):  
R.Kh. Bolotnova ◽  
E.F. Gainullina
Keyword(s):  
Shock Wave ◽  
Numerical Modeling ◽  
Initial Pressure ◽  
Water Volume ◽  
Symmetric Model ◽  
Two Phase ◽  
Experimental Conditions ◽  
Initial Water ◽  
Aqueous Foam ◽  
Spherical Explosion

The spherical explosion propagation process in aqueous foam with the initial water volume content α10=0.0083 corresponding to the experimental conditions is analyzed numerically. The solution method is based on the one-dimensional two-temperature spherically symmetric model for two-phase gas-liquid mixture. The numerical simulation is built by the shock capturing method and movable Lagrangian grids. The amplitude and the width of the initial pressure pulse are found from the amount of experimental explosive energy. The numerical modeling results are compared to the real experiment. It’s shown, that the foam compression in the shock wave leads to the significant decrease in velocity and in amplitude of the shock wave.

scholarly journals Shock Wave Propagation and Flame Kernel Morphology in Laser-Induced Plasma Ignition of CH4/O2/N2 Mixture

Energies ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7976
Author(s):  
Junjie Zhang ◽  
Erjiang Hu ◽  
Qunfei Gao ◽  
Geyuan Yin ◽  
Zuohua Huang
Keyword(s):  
Shock Wave ◽  
Oxygen Content ◽  
Equivalence Ratio ◽  
Laser Energy ◽  
Initial Pressure ◽  
Pure Oxygen ◽  
Laser Ignition ◽  
Flame Kernel ◽  
Jones Model ◽  
Kernel Morphology

The application of laser ignition in the aerospace field has promising prospects. Based on the constant volume combustion chamber, the laser ignition of CH4/O2/N2 mixture with different initial pressure, different laser energy, different equivalence ratio and different oxygen content has been carried out. The development characteristics of the flame kernel and shock wave under different conditions are analyzed. In addition, the Taylor model and Jones model are also used to simulate the development process of the shock wave, and a new modified model is proposed based on the Jones model. The experimental results show that under pure oxygen conditions, the chemical reaction rate of the mixture is too fast, which makes it difficult for the flame kernel to form the ring and third-lobe structure. However, the ring structure is easier to form with the pressure and laser energy degraded; the flame kernel morphology is easier to maintain at a rich equivalence ratio, which is caused by the influence of the movement of hot air flow and a clearer boundary between the ring and the third-lobe. The decrease of the initial pressure or the increase of the laser energy leads to the increase in shock wave velocity, while the change of the equivalence ratio and oxygen content has less influence on the shock wave.

Production of cavitation erosion damage by means of an electromagnetic shock wave source.

2009 ◽  
Vol 125 (4) ◽  
pp. 2561-2561
Author(s):  
Qi Wang ◽  
Nicholas J. Manzi ◽  
R. Glynn Holt ◽  
Ronald A. Roy ◽  
Robin O. Cleveland
Keyword(s):  
Shock Wave ◽  
Cavitation Erosion ◽  
Wave Source ◽  
Erosion Damage ◽  
Electromagnetic Shock ◽  
Electromagnetic Shock Wave

High Pressure Generation Using Underwater Explosion of a Spiral Explosive in a Conical Vessel

2004 ◽  
Vol 126 (2) ◽  
pp. 258-263
Author(s):  
Toru Hamada ◽  
Shigeru Itoh ◽  
Kenji Murata ◽  
Yukio Kato
Keyword(s):  
Shock Wave ◽  
Characteristic Curve ◽  
Three Dimensional ◽  
Underwater Explosion ◽  
Initial Pressure ◽  
Maximum Pressure ◽  
Underwater Shock Wave ◽  
Expansion Curve ◽  
Underwater Shock ◽  
Manganin Gauge

An explosive configuration was studied so that the underwater shock wave converges at the tip of the explosive, and a three-dimensional spiral configuration was obtained. This spiral configuration need to be analyzed theoretically due to the relation of propagation velocity of underwater shock wave, detonation velocity of the explosive and a configuration of vessel to charge the explosive. In order to study an effect of the convergence, pressure measurement at the spiral center was carried out by using a manganin gauge. Therefore, when SEP was used in this experiment, the maximum pressure value was 17.7 GPa. This maximum pressure value is higher than the pressure value of underwater shock wave generated from the underwater explosion of a straight configuration. Furthermore, this maximum pressure value was higher than C-J pressure of SEP. An initial pressure of underwater shock water shock wave that can obtain from an isentropic expansion curve of SEP and a characteristic curve of water is 5.7 GPa, and C-J pressure of SEP is 15.9 GPa. From the above-mentioned, the effect of spiral convergence could be shown well.

Study on the Effects of Shock Wave Propagation on Explosive Forming

2013 ◽  
Vol 767 ◽  
pp. 132-137
Author(s):  
Hirofumi Iyama ◽  
Yoshikazu Higa ◽  
Shigeru Itoh
Keyword(s):  
Shock Wave ◽  
Pressure Vessel ◽  
Pressure Pulse ◽  
Metal Plate ◽  
Water Medium ◽  
Underwater Shock Wave ◽  
Pressure Transmission ◽  
Underwater Shock ◽  
Explosive Forming ◽  
Primary Shock

Explosive forming is one of the unconventional techniques, in which, most commonly, the water is used as the pressure transmission medium. The explosive is set at the top of the pressure vessel filled with water, and is detonated by an electric detonator. The underwater shock wave propagates through the water medium and impinges on the metal plate, which in turn, deforms. There is another pressure pulse acting on the metal plate as the secondary by product of the expansion of the gas generated by detonation of explosive. The secondary pressure pulse duration is longer and the peak pressure is lower than the primary shock pressure. However, the intensity of these pressure pulse is based also on the conditions of a pressure vessel. In order to understand the effects of the configuration of the pressure vessel on the deformation of a metal plate, numerical simulation was performed. This paper reports those results.

Comparison of a new electromagnetic shock wave source with HM3-MOD in a randomised trial

2003 ◽  
Vol 2 (1) ◽  
pp. 11
Author(s):  
F. DeMarco ◽  
G.P. Ricciuti ◽  
L. Grillenzoni ◽  
S. DiNicola ◽  
D. Fini ◽  
...  
Keyword(s):  
Shock Wave ◽  
Randomised Trial ◽  
Wave Source ◽  
Electromagnetic Shock ◽  
Electromagnetic Shock Wave

Shock wave source

1990 ◽  
Vol 88 (5) ◽  
pp. 2515-2515
Author(s):  
Manfred Rattner
Keyword(s):  
Shock Wave ◽  
Wave Source
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