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Nuclear Engineering 470

Nuclear Engineering 470. Modeling a Turbine with TRACE. TURBINE. A turbine is a device designed to convert internal energy of a gas to kinetic energy of rotation of a blade-generator system. All major reactor systems codes have turbine models.

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Nuclear Engineering 470

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  1. Nuclear Engineering 470 Modeling a Turbine with TRACE

  2. TURBINE • A turbine is a device designed to convert internal energy of a gas to kinetic energy of rotation of a blade-generator system. • All major reactor systems codes have turbine models. • They are not widely used because they are unreliable. • The model in TRACE is fairly new. To the extent it has been tested it appears to be superior to other models (TRAC-P, TRAC-B, and RELAP5). • The current model in TRACE uses a non-conservative form of the energy equation. Can have energy conservation problems due to large pressure drops across the face representing the turbine.

  3. TURBINE • 2 Types of Turbines • Reaction Turbine • Multiple Stages • Subsonic Flow • Expansion of gas in rotor blades • Impulse Turbine • Single Stage (in general) • Supersonic flow in nozzles • No expansion of gas in the rotor blades

  4. TURBINE • The input for the TURB component is the same as the TEE with additional input to simulate a steam turbine • The flow through the turbine is not treated in detail, momentum and energy convected across cell edged 2 are calculated using a lumped momentum and energy balance for the turbine.

  5. TURBINE • Turbine efficiency is delivered shaft power as a fraction of available gas kinetic energy after expansion. • This can be misleading since it is not a fraction of the internal enthalpy flow. • When the details of the turbine mechanical power output is not important: • Model an Impulse Turbine with a choked nozzle. • Model a Reaction Turbine with an area change and loss coefficients. • When necessary, model the fluid temperature change across the turbine indirectly through control blocks (control break temp with a control block). • You can induce a temperature change with a negative direct heat to the fluid driven by the control system (no break).

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