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Water Jet 2009. Proceedings
Sitek, Libor
Conference Water Jet 2009 - Research, Development, Application, which is organized by the Department of material disintegration of the Institute of Geonics of the ASCR, v. v. i., is the first meeting of producers, users, designers and other people interested in technology of high speed water jet in the Czech Republic. The main objective of the conference is to provide forum for exchange of knowledge, information and experiences in areas of research, development and application of water jet. Although the conference was originally intended as a more or less local meeting of experts from the Czech Republic, a number of foreign participants proves that this issue is very attractive far beyond the borders of the CR. Problems solved in contributions are very diverse: they range from basic research through traditional and less traditional application of technology in practice to reflection on the impact of the current economic crisis on job shops.
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Turning by high-speed abrasive water jet – our experiences
Sitek, Libor
The paper describes and analyses our own experiences concerning technology of turning by high speed abrasive water jet. Technology development as well as present stay-of–the-art in given area are introduced in brief. Possibilities of application of such machining method especially for shaping and preparation of testing rock specimens suitable for determination of physical-mechanical properties of rocks are also discussed.
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Comparison of Continuous High-Pressure Generated and Pulsing Low-Pressure Generated Water Jets on Concrete
Mádr, V. ; Sitek, Libor ; Hela, R. ; Hlaváč, L. M. ; Bodnárová, L. ; Pustelník, J. ; Janurová, E.
The concrete samples with various erosion states were disintegrated by pure continuous water jets generated from pressure 380 MPa in the Liquid jet laboratory at the VŠB - Technical University of Ostrava. Simultaneously, the identical concrete samples were tested by pulsing water jets generated by low pressure 30 MPa in the Department of Material Disintegration at the Institute of Geonics of the AS CR. The erosion states of samples were prepared by application of several laboratory techniques simulating the concrete aging under the natural conditions due to the real applications in practice. They were prepared at the 127 Institute of Technology of Building Materials and Components of the Brno University of Technology. The influence of the erosion state on the disintegration rate was tested and the surface topography was studied. The comparison of both the depth of penetration and the volume disintegration ratio regarding the input power is performed.
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Advances in pulsating water jet technology
Foldyna, Josef
A research in the area of pulsating water jets is carried out systematically at the Institute of Geonics of the ASCR, v. v. i., in Ostrava since 2000. The research was oriented primarily at the study of processes of generating and forming of pulsating water jets and their effects on various materials. The paper presents results obtained in the area of numerical modelling of the process of generation of pulsating water jets and results of tests of pulsating water jets effects on materials.
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