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ME200 - Lecture 18

ME200 - Lecture 18 - Turbines,Compressors,Pumps ME200...

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10/3/2010 1 Turbines, Compressors, Pumps ME 200 Thermodynamics I L 18 Purdue University , Dr. Tim Pourpoint – [email protected] Lecture 18 October 6 th , 2010 • Application of First Law of Thermodynamics – Nozzles • velocity increases; pressure drops Diffusers Last Lecture – Diffusers • pressure increases; velocity drops – Heat transfer and PE usually negligible for nozzles and diffusers – When the fluid in a nozzle or diffuser is a liquid, PE may be important ME 200 2
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10/3/2010 2 • Applications of First Law of Thermodynamics – Turbines – Compressors and Pumps This Lecture ME 200 3 • A turbine is a steady flow engineering device used to produce net work output from the fluid, fluid drives rotating blades during the expansion process I bi ifi l i f i l i Turbine • In a turbine, specific volume increases from inlet to exit as the working fluid expands • Work interaction device – desired output is mechanical work • Heat transfer usually negligible due to insulation • PE changes usually negligible; may need to consider KE ME 200 4 changes
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10/3/2010 3 Turbine Turbine – Steady Axial Flow Steady Axial Flow ME 200 5 Moran and Shapiro, Fundamentals of Engineering Thermodynamics • A compressor is a steady
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