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Title: THEORETICAL AND EXPERIMENTAL STUDY OF TURBULENT GAS FLOW THROUGH A PNEUMATIC MECHANISM
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THEORETICAL AND EXPERIMENTAL STUDY OF TURBULENT GAS FLOW THROUGH A PNEUMATIC MECHANISM
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1314-2704
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English
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18
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3.2
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The pressure regulators used in underwater breathing apparatuses determine the respiratory comfort of the diver. Our study focuses on the turbulent flow of gas through the series of valves and nozzles that are component elements of a pressure regulator. The pneumatic resistance, induced by the mechanism that controls the dependence between the air flow rate and the pressure differential created by the diver?s air intake, influences to a notable degree the breathing effort. The second stage of an underwater regulator decreases the medium pressure breathing air offered by the first stage, at 8-9 bar above the ambient pressure, to the ambient one. The air flow is critical (Mach number equals 1) in the smallest cross-section of the pneumatic circuit. The downstream valve of the second stage of an unbalanced underwater regulator is regarded as a variable section nozzle mounted in series with an orifice made in the poppet tube that conveys air to the casing of the second stage and further, to the mouth piece. Theoretical results regarding air flow rate and pressure drop in the main cross-sections of the pneumatic path are compared to the values obtained by numerical simulation and laboratory experiments on performance testing machines. Experimental results allowed us to assess the flow rate coefficients for different shapes of this orifice made in the poppet tube.
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conference
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18th International Multidisciplinary Scientific GeoConference SGEM 2018
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18th International Multidisciplinary Scientific GeoConference SGEM 2018, 02-08 July, 2018
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Proceedings Paper
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STEF92 Technology
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International Multidisciplinary Scientific GeoConference-SGEM
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Bulgarian Acad Sci; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci & Arts; Slovak Acad Sci; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; World Acad Sci; European Acad Sci, Arts & Letters; Ac
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1205-1212
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02-08 July, 2018
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website
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cdrom
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1093
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compressible fluids; air flow rate; orifice; critical flow
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