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Stress state rock mass monitoring ahead of longwall No. 371 202 at 2ndA block, Mine Plant 2, OKD, a.s
Waclawik, Petr; Ptáček, Jiří; Koníček, Petr; Vavro, Martin; Staš, Lubomír; Souček, Kamil; Kukutsch, Radovan; Kajzar, Vlastimil
2015 - English
Generally, the accurate knowledge of the stress strain state of the rock mass in the neighbourhood of the mining galleries and underground openings is absolutely critical for their precise support designing, not only in the vicinity of them, but also at a greater distance from them if the phenomenon affecting the rock mass stress fields occurs. Measurement (investigation) of the rock stress is usually carried out by interpretation of the rock mass deformation processes, which can be relatively precisely observed and measured. The roadways are loaded not only by rock pressures in the front of the coalfaces but also by destress blasting realised in the overburden rock seam in the scope of the rockburst prevention. In addition, the rock stress distribution is influenced by old mining activities too, for example by abandoned coal pillars in the seams in overburden, respectively by goaf in the excavated seam. All of these factors can significantly affect the stress-strain behaviour of the rock mass around the mining works.
Keywords:
stress state; monitoring; rock mass
Available at various institutes of the ASCR
Stress state rock mass monitoring ahead of longwall No. 371 202 at 2ndA block, Mine Plant 2, OKD, a.s
Generally, the accurate knowledge of the stress strain state of the rock mass in the neighbourhood of the mining galleries and underground openings is absolutely critical for their precise support ...
CFD model of mixture gas flow in the vacuum column 12T-70102, existing state of internals
Říha, Zdeněk
2015 - English
The report contains description of fluid flow for case with existing state of the column 12T -70102. Vapor flow was mainly calculated in the above mentioned geometry. In last iteration the liquid droplet (diameter 0,3mm) were injected into the geometry through the nozzle 12, see enclosure in the report. Introductory section of the enclosuere contains pictures with geometry and boundary conditions description, See figure G1. Then, slice plan follows, see figure G2. Next pictures show distribution of pressure and velocity on given slices. Pictures at the end of the enclosure show path-lines distribution and droplets particle traces distribution in the solved geometry.
Keywords:
CFD model; vacuum column; gas flow
Available on request at various institutes of the ASCR
CFD model of mixture gas flow in the vacuum column 12T-70102, existing state of internals
The report contains description of fluid flow for case with existing state of the column 12T -70102. Vapor flow was mainly calculated in the above mentioned geometry. In last iteration the liquid ...
CDF model of mixture gas flow in the vacuum column 12T-70102, revamp tower
Říha, Zdeněk
2015 - English
The report contains description of fluid flow for case with revamp tower of the column 12T -70102. Vapor flow was mainly calculated in the above mentioned geometry. In last iteration the liquid droplet (diameter 0,3mm) were injected into the geometry through the nozzle 12, see enclosure in the report. Introductory section of the enclosuere contains pictures with geometry and boundary conditions description, See figure G1. Then, slice plan follows, see figure G2. Next pictures show distribution of pressure and velocity on given slices. Pictures at the end of the enclosure show path-lines distribution and droplets particle traces distribution in the solved geometry.
Keywords:
CDF model; vacuum column; gas flow
Available on request at various institutes of the ASCR
CDF model of mixture gas flow in the vacuum column 12T-70102, revamp tower
The report contains description of fluid flow for case with revamp tower of the column 12T -70102. Vapor flow was mainly calculated in the above mentioned geometry. In last iteration the liquid ...
CFD model of mixture gas flow in the vacuum column D-6501
Říha, Zdeněk
2015 - English
The report contains CFD results and description of the gas mixture flow in the vacuum column D-6501. Two rotationally opposite (swirl) input nozzles S1 and S2 (ID 0,835m) create main input of vapour into the vacuum column. There are two enhanced vapour horn (EVH) distributor, for given input nozzle (S1, S2) separately. Enhanced vapour horn makes redistribution of vapour leaded from above mentioned nozzles. There also is next input of vapor given by bottom striping section. The inner diameter of the column is 7,464m and solved domain has height c. 15m. Aim of the calculation is to show distribution of calculated variables (velocity, pressure, density, etc.) on given slices. Mainly, we would like to know if the distribution of velocity is sufficiently uniform at the input into the packing bed SECTION “B”.
Keywords:
CDF model; gas flow; vacuum column
Available on request at various institutes of the ASCR
CFD model of mixture gas flow in the vacuum column D-6501
The report contains CFD results and description of the gas mixture flow in the vacuum column D-6501. Two rotationally opposite (swirl) input nozzles S1 and S2 (ID 0,835m) create main input of vapour ...
CFD model of mixture gas flow in the vacuum column D-6501, adjusted EVH and tray
Říha, Zdeněk
2015 - English
The report contains CFD results and description of the gas mixture flow in the vacuum column D-6501 with adjusted internals against last calculated case, see [1]. Two rotationally opposite (swirl) input nozzles S1 and S2 (ID 0,835m) create main input of vapour into the vacuum column. There are two enhanced vapour horn (EVH) distributor, for given input nozzle (S1, S2) separately. Enhanced vapour horn makes redistribution of vapour leaded from above mentioned nozzles. There also is next input of vapor given by bottom striping section. The inner diameter of the column is 7,464m and solved domain has height c. 15m. Aim of the calculation is to show distribution of calculated variables (velocity, pressure, density, etc.) on given slices. Mainly, we would like to know if the distribution of velocity is sufficiently uniform at the input into the packing bed SECTION “B”
Keywords:
CFD model; vacuum column; gas flow
Available on request at various institutes of the ASCR
CFD model of mixture gas flow in the vacuum column D-6501, adjusted EVH and tray
The report contains CFD results and description of the gas mixture flow in the vacuum column D-6501 with adjusted internals against last calculated case, see [1]. Two rotationally opposite (swirl) ...
The flow of mixture vapors in the athmospheric column, comparison of new distributor and new tray
Říha, Zdeněk
2014 - English
The description of CFD analysis and the description of mixture gas flow in the atmospheric column are listed in the report. This article builds on previous work [1]. There were calculated two cases with original distributor and with GT-OPTIFLOW distributor, see [1]. This article adds next two cases. The case with adjusted GT-OPTIFLOW distributor (enclosure 1) and adjusted GT-OPTIFLOW distributor with newly designed the chimney tray and new layout of the packing bed (enclosure 2). The flow area of the newly designed chimney tray is smaller than for previous design (5,36m2 vs. 6,89m2). New layout of the packing bed has smaller flow area (28,27m2 vs. 29,35m2) and higher pressure drop (129 Pa vs. 80Pa) in comparison with last design of the packing bed also used in [1].
Keywords:
mixture vapors; CFD analysis; velocity density pressure
Available at various institutes of the ASCR
The flow of mixture vapors in the athmospheric column, comparison of new distributor and new tray
The description of CFD analysis and the description of mixture gas flow in the atmospheric column are listed in the report. This article builds on previous work [1]. There were calculated two cases ...
The measurement of the velocity of individual particles in the ASJ downstream to the nozzle exit
Foldyna, Josef; Zeleňák, Michal
2014 - English
Based on the order no. L-BS-1410682 placed by the Lübeck company ANT Applied New Technologies AG (Germany), the measurement of the velocity of individual particles in the ASJ (or WAS)downstream to the nozzle exit using FPIV method combined with PTV method was carried out at ANT premises in Lübeck from Wednesday, November 12th, 2014 to Thursday, November 13th, 2014.
Keywords:
ASJ downstream; measurement; individual particles
Available at various institutes of the ASCR
The measurement of the velocity of individual particles in the ASJ downstream to the nozzle exit
Based on the order no. L-BS-1410682 placed by the Lübeck company ANT Applied New Technologies AG (Germany), the measurement of the velocity of individual particles in the ASJ (or WAS)downstream to the ...
Research Assistance to Improve Pulsating System
Foldyna, Josef; Zeleňák, Michal; Švehla, B.
2013 - English
The report presents the results of contract research for the company Dürr Ecoclean, aimed at improving the system using pulsating water jet. It was implemented and analyzed an extensive set of measurements with units 20 and 40 kHz and of recommendations for the next steps solutions.
Keywords:
pulsating system; water jet; pressure sensors
Available at various institutes of the ASCR
Research Assistance to Improve Pulsating System
The report presents the results of contract research for the company Dürr Ecoclean, aimed at improving the system using pulsating water jet. It was implemented and analyzed an extensive set of ...
Testing of Nozzles
Foldyna, Josef; Sitek, Libor; Ščučka, Jiří; Klich, Jiří; Hlaváček, Petr
2010 - English
Based on the request made by the company NET Ltd. Staré Město pod Sněžníkem, tests of quality of nozzles for generation of high-speed water jet were performed at the Department of material disintegration of the Institute of Geonics AS CR, v. v. i., in Ostrava. Three nozzles provided by NET were tested. The nozzles were marked as nozzle CKM – A, nozzle CKM – B, and nozzle ACMK. The nozzle quality was evaluated by the determination of their discharge coefficient at various operating pressures and by visual inspection of the quality of the nozzle and the water jet.
Keywords:
nozzles; high-speed water jet; discharge coefficient
Available at various institutes of the ASCR
Testing of Nozzles
Based on the request made by the company NET Ltd. Staré Město pod Sněžníkem, tests of quality of nozzles for generation of high-speed water jet were performed at the Department of material ...
Testing of quality of nozzles
Foldyna, Josef; Sitek, Libor; Ščučka, Jiří
2008 - English
The report describes results of quality tests of nozzles for generation of high-speed water jet. The nozzle quality was evaluated by the determination of their discharge coefficient and by visual inspection of the nozzle and the water jet. Ve zprávě jsou uvedeny výsledky testů kvality trysek pro generování vysokorychlostního vodního paprsku. Kvalita trysek byla hodnocena stanovením průtokového součinitele a vizuální kontrolou trysky a vodního paprsku.
Keywords:
high-speed water jet; nozzle; visualization
Available at various institutes of the ASCR
Testing of quality of nozzles
The report describes results of quality tests of nozzles for generation of high-speed water jet. The nozzle quality was evaluated by the determination of their discharge coefficient and by visual ...
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