Lecture17_Nozzles_Diffusers-handout[1]

Lecture17_Nozzles_Diffusers-handout[1] - ME200 :...

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1 Professor: Euiwon Bae Lecture Hours : MWF 1:30-2:20 in ME1130 Office Hours : MWF 2:30-3:30 in ME1091 Email : ebae@purdue.edu Phone : 765-494-6849 Course website : http://engineering.purdue.edu/ME200 ME200 : Thermodynamics I Lecture 17 :Nozzles and Diffusers
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2 Outline Nozzles and diffusers Modeling consideration Examples
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3 Nozzles & Diffuser - Nozzles : Flow passage of varying cross-section areas with velocity of fluid increases (converging ) Ex : Fire nozzles, jet engines, spray nozzles - Diffuser : fluid is decelerated (diverging cross-section)
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4 Modeling Nozzle Diffuser -Typical assumption - - - -
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5 Modeling 0 = ° ±² − ? ±² + ? ݅ (? ݅ − ? ? ) + ´ 2 −³ µ 2 ) + ·(¸ ´ −¸ µ ) Nozzle Diffuser ≅0 Energy balance Mass balance ¹? º» ¹¼ = ½ ? ݅¾ ¿¿ − ½ ? ÀÁ¼ = 0 inlet exit inlet exit
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6 Modeling Energy source of nozzle acceleration? Nozzle P 1 T 1 P 2 T 2 ? 2 ? 1 0 = ± ݅ (? ² − ? ³ ) + (? 1 2 −? 2 2 ) ³ h 1 =u 1 +P 1
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This note was uploaded on 12/11/2011 for the course ME 200 taught by Professor Gal during the Fall '08 term at Purdue University-West Lafayette.

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Lecture17_Nozzles_Diffusers-handout[1] - ME200 :...

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