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Archives of Acoustics
EN Acoustic signals of small arm's fire, the muzzle blast and the shock wave generated by a supersonic bullet in air, are difficult to mask and can be exploited for localization of the hidden sniper. This paper presents the system of acoustic measurements, based on a number of both directional and omni[...]
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Journal of Theoretical and Applied Mechanics
2007 Vol. 45 nr 4 801-817
PL W pracy zajęto się problemem propagacji sferycznych fal uderzeniowych o wykładniczym rozkładzie gęstości w zanieczyszczonym gazie z uwzględnieniem radiacyjnej wymiany ciepła. Założono równowagowe warunki przepływu czynnika, a samą radiację przyjęto typu dyfuzyjnego w modelu optycznie nieprzezroczyst[...]
EN The propagation of spherical shock waves in a dusty gas with radiation heat-flux and exponentially varying density is investigated in the paper. The equilibrium flow conditions are assumed to be maintained, and the radiation is considered to be of a diffusion type for an optically thick grey gas mod[...]
3
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Materials Science Poland
2004 Vol. 22, No. 2 123--129
EN Physical metallurgical and computer simulation methods were used to study the propagation and interaction of shock waves in steel balls subjected to convergent dodecahedrally symmetric shock waves. Conditions for energy cumulation and the realization of regular and irregular types of shock wave inte[...]
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Materials Science Poland
2004 Vol. 22, No. 2 117--121
EN A shock-wave model of the effect of superdeep penetration of explosion accelerated powder particles into metallic materials has been created. A criterion for the phenomenon proceeding by explosive loading of a target by a flow of particles is obtained. It is established that a flow action results in[...]
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Bulletin of the Polish Academy of Sciences. Technical Sciences
EN In this paper steady transonic flows are considered. A modelization and a functional approach are proposed. In order to constrain the shock waves to appear, a jump inequality, involving the tangential component of the mass flux is introduced. A new solution procedure is given by minimizing a functio[...]
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Archives of Mechanics
EN In the design of structural elements, which are used for protection against explosions, the damage evolution until failure has to be predicted in numerical simulations. However, in the literature a wide variety of damage models is available based on different approaches, e.g. phenomenological and mi[...]
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TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
2001 Vol. 5, No 4 549-556
EN The paper presents supersonic flow simulation results concerning the lambda-foot formation in the divergent nozzle. The SPARC code was used and the vicinity of the triple point was analysed. Special boundary conditions have been used in order to obtain supersonic inlet velocity with shock wave in th[...]
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International Journal of Applied Mechanics and Engineering
2001 Vol. 6, no 1 211-226
EN In this paper, the basic processes accompanying a shock initiation of a detonation have been analyzed theoretically using numerical methods. The detailed discussion of initiation of a detonation by nonstationary shock waves generated by a solid body impact or explosively driven inertial partition is[...]
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International Journal of Applied Mechanics and Engineering
2002 Vol. 7, no 2 445-464
EN The problem of propagation of shock waves in non-ideal fluids has been discussed. In the course of discussion, the similarity solution method developed by Sedov has been used. The effects due to geometry of the motion, presence of magnetic field and rotation of the fluid on the propagation of shock [...]
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Archivum Combustionis
EN This work presents a numerical analysis of the flow and combustion phenomena inside the Radial Disk Internal Combustion Engine. In the set of arch chambers forming the engine disk, a mixture of hydrogen peroxide with hydrogen is burned under constant volume conditions. The thermal decomposition of h[...]
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Journal of KONES
EN This paper contains an experimental investigation of a movable wall with variable shape response to a shock wave. Here, the shock wave was generated by a pyrotechnic gas generator used in the automotive industry. The test station consists on a pyrotechnic actuator in which the movable wall is expres[...]
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TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
EN This paper presents the results of numerical simulations of supersonic flows with shock waves in a divergent symmetric nozzle of an opening angle ranging from 2 degrees to 6 degrees. At certain Mach number values the shock pattern becomes asymmetric. This asymmetry is analysed here for different val[...]
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TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
2005 Vol. 9, No 1 115-132
EN The flow in transonic diffusers and supersonic air intakes often becomes unsteady due to shock wave-boundary layer interaction. Oscillations may be induced by natural separation unsteadiness or forced by boundary conditions. Significant improvements of CFD tools, increased computer resources and the[...]
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Central European Journal of Energetic Materials
EN This paper deals with the problem of transformation and practical utilisation of explosion energy. A principle has been suggested and described that enables utilisation of detonation energy of condensed explosive used as energy source exerting shock wave strain upon piezoelectric sample cut prepared[...]
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Wiadomości Chemiczne
2003 [Z] 57, 3-4 305-322
EN In the present work a survey of literature data concerning shock wave synthesis of dense modifications of carbon and boron nitride is presented. Transformations of graphite and graphitic boron nitride under shock loading are characterised. Various types of explosive set-ups used for shock loading of[...]
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TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk
EN The aerodynamics of transonic fans is discussed with emphasis on the use of three-dimensional design techniques, such as blade sweep and lean, to improve their performance. In order to study the interaction of these 3D features with the shock pattern a series of five different designs is produced an[...]
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Archivum Combustionis
EN Steady detonation regimes in an aerosuspension of aluminium particles is studied on the basis of the mathematical model of heterogenerous detonation with regard for differences in phase velocities and temperatures. The presence of unburned particles in detonation products conditions the sound speed[...]
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Zeszyty Naukowe. Cieplne Maszyny Przepływowe - Turbomachinery / Politechnika Łódzka
EN In this paper, the comparison between numerical results of flow field in cross-flow fan and experimental investigations made by Harloff (1979) has been presented. Obtained compability has given confirmation, that computer program was used, adequately. This program has been nextly applied to simulati[...]
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International Journal of Applied Mechanics and Engineering
EN Similarity solutions are obtained for one-dimensional adiabatic flow behind a magnetogasdynamic cylindrical shock wave propagating in a rotating a medium in presence of a variable or constant azimuthal magnetic field. The density of the medium ahead of the shock is assumed to be varying and obeying [...]
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International Journal of Applied Mechanics and Engineering
EN Similarity solutions for one-dimensional unsteady self-similar flow behind a strong shock driven out by a cylindricaI (or spherical) piston in a medium which is assumed to be a non-ideaI gas obeying a simplified van der Waals equation of state are obtained. Both the cases, when the flow between the [...]
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