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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 : [email protected] 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 = 𝑄 𝑐𝑣 − ? 𝑐𝑣 + ? 𝑖 (ℎ 𝑖 − ℎ ? ) + (? 𝑖 2 −? 𝑒 2 ) 2 + 𝑔(𝑧 𝑖 −𝑧 𝑒 ) Nozzle Diffuser ≅ 0 Energy balance Mass balance ?? ?? ?? = ? 𝑖? − ? ??? = 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 = ? 𝑖 (ℎ 1 − ℎ 2 ) + (? 1 2 −? 2 2 ) 2 h 1 =u 1 +P 1 V 1 ; inlet source has higher enthalpy
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