GasDynamics_web - ENU 4133 – Gas Dynamics(Compressible...

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Unformatted text preview: ENU 4133 – Gas Dynamics (Compressible Flow) March 7, 2011 Gas Dynamics & Compressible Flow – Ch. 9 in White The coverage will focus on Sections 9.1–9.4, through “Choking”. White’s discussion focuses on air, which is not ideal for our purposes (helium and/or carbon dioxide would be appropriate). Note also that White gives significant coverage to supersonic flows, which are irrelevant to NE – we focus on compressible, sub-sonic flow. 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 [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. For 1 . 2 < Ma , supersonic flow prevails. It is of little nuclear relevance (big in aerospace, though). Specific Heat Ratio k is defined as the ratio of c p (specific heat at constant pressure,...
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This note was uploaded on 10/22/2011 for the course ENU 4134 taught by Professor Schubring during the Fall '11 term at University of Florida.

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GasDynamics_web - ENU 4133 – Gas Dynamics(Compressible...

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