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1. Numerical Simulation of CL-20 Underwater Explosion Performance of Shock Waves and Pulsating Bubble Phenomena | |||
FENG Song,PENG Jinhua,RAO Guoning | |||
Mechanics 08 December 2015 | |||
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Abstract:This paper describes numerical methodology to model and investigates the shock waves and bubble dynamics produced by an underwater explosion when it happens in limited waters. The nonlinear dynamics results were calculated by ANSYS-AUTODYN explicit software. CL-20 was studied as basic research object in underwater test. The results calculated by empirical formula and AUTODYN was compared in order to corroborate the accuracy of numerical results. It was shown that pressure and impulse histories for simulation are in good correspondence with the data calculated by empirical formula, which confirms that the method of numerical simulation is reliable. | |||
TO cite this article:FENG Song,PENG Jinhua,RAO Guoning. Numerical Simulation of CL-20 Underwater Explosion Performance of Shock Waves and Pulsating Bubble Phenomena[OL].[ 8 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4667297 |
2. performamance of transient tempertureature in hot spot ignition | |||
Zhang Qi | |||
Mechanics 19 July 2012 | |||
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Abstract:This work presents a method to estimate probability initiating combustion and detonation by temperature load in void in energetic material. When a void is compressed its volume decreases and the temperature in the void increases. The local thermal source due to the void deformation in energetic material forms a temperature load which may initiate combustion and detonation. The temperature-time history in the void was called temperature load in this work. Its peak value and holding time are the necessary and sufficient condition initiating combustion or detonation of energetic material surrounding the void. Comparing with the energy acted on the unit area of hot spot, the performance of transient temperature which can better serve to reflect the physical essence in ignition. The main object of this work is to study transmitting process of temperature load from void to energetic material and probability initiating combustion and detonation by temperature load in void. | |||
TO cite this article:Zhang Qi. performamance of transient tempertureature in hot spot ignition[OL].[19 July 2012] http://en.paper.edu.cn/en_releasepaper/content/4485236 |
3. Numerical Analysis of Vortex-like structure induced mechanism in Gaseous Detonation phenomena | |||
Wang Changjian,Guo Changming | |||
Mechanics 12 November 2009 | |||
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Abstract:Two-dimensional, time-dependent, reactive Navier–Stokes equations involving the effects of viscosity, thermal conduction, molecular diffusion and turbulence etc. were solved to obtain a deep insight into gaseous detonation vortex-like structures and its induced mechanism. Detailed chemical reaction model, together with standard k-εturbulence model, was employed in this paper. Numerical simulation indicates that a large amount of vortex-like structure emerges in detonation flow field due to its intrinsic three-dimensional structure. Vortex-like structure can also be induced by wall geometry with an abrupt cross-section area change. Shock wave interacts with slip line, which in turn causes the formation of vortex-like structure. In nature, all these induce the instability of slip line, so it is the slip line instability that is the essential reason for the emergence of vortex-like structure. Additionally, the difference of vortex-like structure between an ordinary detonation and a marginal detonation was compared. In an ordinary detonation, the vorticity magnitude of vortex-like structure is different, even for two vortex-like structures in the same pair. With increasing the distance away from leading front, the vorticity magnitude gradually decays. Slip line in a marginal detonation is more unstable and produces more vortex-like structures. | |||
TO cite this article:Wang Changjian,Guo Changming. Numerical Analysis of Vortex-like structure induced mechanism in Gaseous Detonation phenomena[OL].[12 November 2009] http://en.paper.edu.cn/en_releasepaper/content/36651 |
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