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- Politecnico di Milano
- Degree programme
- Aerospace Engineering
- Subject
- Propulsione Aerospaziale
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- Notes · By topic
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Dimensionamento di un propulsore bi stadio
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Propulsione AerospazialeBy topic
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c f c mol p v ⇢p 3 rb=apn a n logrb=l o g (apn) logrb=l o ga+nlogp y=k2+nk1 n a k2=l o ga b Pa=0 Is,vac=S ˙mg=˙mve+Ae(Pe Pa) ˙mg0 =ve g0 +(Pe Pa) ⇢eveg0 =2 6 6s c 3 ˙mox/˙mfu 1 "=At Ae = ✓k+1 2 ◆1 k 1 ✓Pe Pc ◆1 k vuutk+1 k 1 " 1 ✓Pe Pc ◆k 1 k # Pe/Pc Pe/Pc=1/444 Pa=0 Is,vac=S ˙mg=˙mve+Ae(Pe Pa) ˙mg0 =ve g0 +(Pe Pa) ⇢eveg0 =4 7 1s 0 10 20 30 40 50 0 100 200 300 400 500 600 ε = Ae / At P/Pc Isentropic expansion - Area ratio k = 1.2 k = 1.3 k = 1.4 • pay • m t • p 0 •⇠m=Mm/M0=0.024 •⇠t=Mt/Mp=0.046 Mf2=Mpay+Mm+Mt=Mpay+M02⇠m+Mp2⇠t Mf2=Mpay+Mm+Mt=Mpay+M02⇠m+(M02 Mf2)⇠t V=gIs2ln(M02/Mf2)=c2ln(M02/Mf2) exp( V/ c2)= 6.58 M02= Mpayexp( V/ c2) 1+⇠t exp( V/ c2)(⇠m+⇠t)=2 1 7 3kg M02 Mp2 Mf2 Mf1=M02+MHW1 ⇠HW1= MHW1/Mp1=0.14 V1=gIs1ln(M01/Mf1)=c1ln(M01/Mf1) exp( V1/c1)= 2,44 M01 Mp1 Mf1
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