Document information
- University
- Politecnico di Milano
- Degree programme
- Mechanical Engineering
- Subject
- Macchine (Propedeutico)
- Academic year
- 2012-2013
- Classification
- Exam · Full exam
- Content
- Exam paper only
- Original format
- Text
- Searchable text
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Study material for Macchine (Propedeutico), shared by the Studwiz community and reviewed by moderators.
Macchine (Propedeutico)Full exam
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Come prima, dal BEM: l-lw = ΔPtot/ρ e l-lw = gH = ηl, quindi ΔPtot = η ltot = 6049 Pa Considerando una sezione 4 "lontana": P4,tot ≈ P4,stat = Patm (aria ferma) e P3,tot = P4,tot (isoentropico) P3,tot = P0,tot + ΔPtot,complessivo = 1006049 Pa Quindi ricavo V4 dalla definizione di Ptot per i liquidi incomprimibili: V4 = rad(2(P3,tot - Patm)/ρ) = 100,41 m/s E dalla conservazione della portata: S4 = Q/V4 = 1,394 m2
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