GasDynamics_web - ENU 4133 Gas Dynamics (Compressible Flow)...

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Unformatted text preview: ENU 4133 Gas Dynamics (Compressible Flow) April 12, 2010 Gas Dynamics & Compressible Flow Ch. 9 in White The coverage will focus on Sections 9.19.4, through Choking on Page 617 Whites discussion focuses on air, which is not ideal for our purposes (helium and/or carbon dioxide would be appropriate). Note also that White gives equal time to supersonic flows, which are also of little relevance in the nuclear world. We will instead focus on conditions where the Mach number is high enough to require a compressible flow analysis, but not higher than 1. Gas Dynamics Outline I Mach number regimes (9.1) I Thermodynamics review specific heat ratio, perfect gas, isentropic processes (9.1) I Speed of sound (9.2) I Adibatic, isentropic steady compressible flow (9.3) I Flow with area changes, including choking condition (9.4) Mach Number Regimes (9.1) Mach number ( a : sound speed [a: acoustic speed], V : magnitude of velocity) Ma = V a (1) For Ma < . 3, the flow is usually well-approximated as incompressible. Gas-cooled reactor designs are planned to operate (slightly) below Ma = 0 . 3. For 0 . 3 < Ma < . 8, subsonic but compressible flow prevails. For 0 . 8 < Ma < 1 . 2, transonic flow prevails. Significant internal flow behavior changes occur at Ma = 1 . 0. As with laminar/turbulent flow, this is the transitional region best avoided....
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GasDynamics_web - ENU 4133 Gas Dynamics (Compressible Flow)...

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