{
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"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 19: Jet Propulsion and Rocket Engines"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 1, page no. 873"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"from __future__ import division\n",
"\n",
"from math import sqrt\n",
"\n",
"#Variable Declaration: \n",
"Cpg = 1.13 #Specific heat of gases(in kJ/kg.K):\n",
"Cpa = 1.005 \n",
"rg = 1.33\n",
"ra = 1.4\n",
"C = 41.84*10**3 #kJ/kg of fuel\n",
"T1 = 272 #Temperatures(in K):\n",
"T3 = 1000\n",
"nc = 0.84 #Compression efficiency:\n",
"p3 = 3\n",
"p2 = 3\n",
"p1 = 0.5\n",
"p5 = 0.4\n",
"nt = 0.82 #Turbine efficiency:\n",
"nn = 0.92 #Nozzle efficiency:\n",
"Ca = 200 #Speed(in m/s):\n",
"T2 = T1*(p2/p1)**((ra-1)/ra) #Temperature at state 2(in K):\n",
"T2a = T1+(T2-T1)/nc #Temperature at state 2'(in K):\n",
"Wc = Cpa*(T2a-T1) #Compressive work(in kW):\n",
"r = (C-Cpg*T3)/(Cpg*T3-Cpa*T2a) #Air fuel ratio:\n",
"T4a = T3-Cpa/Cpg*(T2a-T1)/(1+r) #Temperature at state 4'(in K):\n",
"T4a = 810.46\n",
"T4 = T3-(T3-T4a)/nt\n",
"p4 = p3*(T4/T3)**(rg/(rg-1)) #Pressure of gas leaving turbine(in bar):\n",
"T5 = T4a*(p5/p4)**((rg-1)/rg) #Temperature at state 5(in K):\n",
"T5a = T4a-nn*(T4a-T5) #Temperature at state 5'(in K):\n",
"C5a = sqrt(2*Cpg*(T4a-T5a)*10**3) #Exit jet velocity(in m/s):\n",
"Ce = C5a\n",
"T = (1+1/r)*Ce-Ca #Thrust per kg of air per second:\n",
"\n",
"#Results: \n",
"print \"Power required for compressor: \",round(Wc,2),\"kW/kg\"\n",
"print \"Air fuel ratio: \",round(r,2)\n",
"print \"Pressure of gas leaving turbine: \",round(p4,2),\"bar\"\n",
"print \"Thrust: \",round(T,2),\"N/kg/s\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Power required for compressor: 217.55 kW/kg\n",
"Air fuel ratio: 63.7\n",
"Pressure of gas leaving turbine: 1.04 bar\n",
"Thrust: 405.75 N/kg/s\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 2, page no. 876"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"from __future__ import division\n",
" \n",
"from math import sqrt\n",
"\n",
"#Variable Declaration: \n",
"T1 = 285 #K\n",
"p1 = 1 #bar\n",
"T3 = 773 #K\n",
"p2 = 4 #bar\n",
"r = 1.4\n",
"Cpa = 1.005 #kJ/kg.K\n",
"CV = 43100 #kJ/kg.K\n",
"T3 = 273+500 #K\n",
"\n",
"#Calculations:\n",
"T2 = T1*(p2/p1)**((r-1)/r) #Temperature at state 2(in K):\n",
"T2a = T1+1.1*(T2-T1) #Temperature at state 2'(in K):\n",
"Wc = Cpa*(T2a-T1) #Work required in compressor(in kJ/kg of air):\n",
"qa = Cpa*(T3-T2a) #Heat added in combustion chamber(in kJ/kg of air):\n",
"r1 = CV/qa #Air fuel ratio:\n",
"T5 = T3*(p1/p2)**((r-1)/r) #Temperature at state 5(in K):\n",
"hd = Cpa*(T3-T5-T2a+T1) #Enthalpy drop in the nozzle(in kJ/kg of air):\n",
"Ce = sqrt(2*hd*10**3) #Velocity of exit gas from nozzle(in m/s):\n",
"T = (1+1/r)*Ce #Thrust(in N/kg/s):\n",
"\n",
"#Results: \n",
"print \"Power required to drive compressor: \",round(Wc,2),\"kW/kg of air\"\n",
"print \"Air-fuel ratio: \",round(r1,2)\n",
"print \"Thrust: \",round(Ce,2),\"N/kg of air/s\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Power required to drive compressor: 153.12 kW/kg of air\n",
"Air-fuel ratio: 127.77\n",
"Thrust: 449.34 N/kg of air/s\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 3, page no. 877"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"from __future__ import division\n",
" \n",
"from math import sqrt\n",
"\n",
"#Variable Declaration: \n",
"Cpg = 1.14 #kJ/kg.K,Specific heat of gases(in kJ/kg.K):\n",
"Cpa = 1.005 #kJ/kg.K,Specific heat of gases(in kJ/kg.K):\n",
"nm = 0.96 #Mechanical efficiency:\n",
"nc = 0.87 #Polytropic efficiency of compressor:\n",
"nt = 0.90 #Turbine efficiency:\n",
"nn = 0.95 #Nozzle efficiency:\n",
"B = 5.5 #By pass ratio:\n",
"ma = 200 #Mass flow rate of air(in kg/s):\n",
"p2 = 1.5 #Pressures(in bar):\n",
"p1 = 1\n",
"p3 = 28\n",
"pa = p1\n",
"T1 = 288 #Temperatures(in K):\n",
"rg = 1.33\n",
"ra = 1.4\n",
"CV = 43100 #kJ/kg\n",
"T4 = 1573 #K\n",
"\n",
"#Calculations:\n",
"a1 = 1/nc*(ra-1)/ra #For compression:a1 = ((ne-1)/ne)\n",
"a1 = 0.328\n",
"a2 = nt*(rg-1)/rg #For expansion:a2 = (nt-1)/nt\n",
"a2 = 0.223\n",
"T2a = T1*(p2/p1)**a1 #Temperature at state 2'(in K):\n",
"T3a = T2a*(p3/p2)**a2 #Temperature at state 3'(in K):\n",
"dT = nn*T2a*(1-(pa/p2)**((ra-1)/ra))#Using nozzle efficiency:\n",
"C8 = sqrt(2*Cpa*10**3*dT) #Velocity at exit of nozzle(in m/s):\n",
"mab = ma*B/(B+1) #Mass flow rate of bypass air(in kg/s):\n",
"mca = ma-mab #Mass flow rate of hot gases(in kg/s):\n",
"Tb = mab*C8/10**3 #Thrust available due to by pass air(in kN):\n",
"r1 = (Cpg*T4-Cpa*T3a)/(CV-Cpg*T4) #Air fuel ratio:\n",
"T5a = T4-(Cpa*(T3a-T2a)/(nm*(1+r1)*Cpg))#Temperature at state 5'(in K):\n",
"T6a = (Cpg*nm*T5a-(1+B)*Cpa*(T2a-T1))/(Cpg*nm)#Temperature at state 6'(in K):\n",
"p4 = p3-p2 #Pressure at state 4(in bar):\n",
"p5 = p4*(T5a/T4)**(1/a2) #Pressure at state 5(in bar):\n",
"p6 = p5*(T6a/T5a)**(1/a2)#Pressure at state 6(in bar):\n",
"c = ((rg+1)/2)**(rg/(rg #Pressure at state 7(in bar):\n",
"dT1 = nn*T6a*(1-(p7/p6)**((rg-1)/rg))#For exit nozzle(in K):\n",
"C7 = sqrt(2*Cpg*10**3*dT1) #Velocity at exit of nozzle(in m/s):\n",
"Tg = mca*C7/10**3 #Thrust due to hot gases(in kN):\n",
"Tt = Tg+Tb #Total thrust(in kN):\n",
"st = Tt/ma #Specific thrust(in kN/kg/s):\n",
"sfc = r1*mca*3600/(Tt*10**3) #Specific fuel consumption(in kg/h.N):\n",
"\n",
"#Results: \n",
"print \"Specific thrust: \",round(st,3),\"kN/kg/s\"\n",
"print \"Specific fuel consumption: \",round(sfc,2),\"kg/h.N\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Specific thrust: 0.309 kN/kg/s\n",
"Specific fuel consumption: 0.05 kg/h.N\n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4, page no. 881"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"from __future__ import division\n",
"\n",
"#Variable Declaration: \n",
"Ca = 277.78 #Velociy of turbojet plane(in m/s):\n",
"r1 = 0.5 #Thrust to velocity ratio:\n",
"m = 50 #Rate at which air enters(in kg/s):\n",
"r = 52 #Air fuel ratio:\n",
"LCV = 43100 #Lower calorific value of fuel:\n",
"\n",
"#Calculations:\n",
"Ce = Ca/r1 #Jet velocity(in m/s):\n",
"T = (m+m/r)*Ce-m*Ca #Thrust(in N):\n",
"St = T/m #Specific thrust(in N/kg/s):\n",
"P = T*Ca/10**3 #Thrust power(in kW):\n",
"np = 2/(1+1/r1)*100 #Propulsive efficiency:\n",
"nt = ((1+1/r)*Ce**2-Ca**2)/(2*1/r*LCV)/10 #Thermal efficiency:\n",
"no = np*nt/100 #Overall efficiency:\n",
"sfc = m/r*3600/(T) #Specific fuel consumption(in kg/h.N):\n",
"\n",
"#Results: \n",
"print \"Jet velocity: \",round(Ce,2),\"m/s\"\n",
"print \"Thrust: \",round(T/10**3,2),\"kN\"\n",
"print \"Specific thrust: \",round(St,2),\"N/kg/s\"\n",
"print \"Thrust power: \",round(P,2),\"kW\"\n",
"print \"Propulsive efficiency: \",round(np,2),\"%\"\n",
"print \"Thermal efficiency: \",round(nt,2),\"%\"\n",
"print \"Overall efficiency: \",round(no,2),\"%\"\n",
"print \"Specific fuel consumption: \",round(sfc,4),\"kg/h.N\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Jet velocity: 555.56 m/s\n",
"Thrust: 14.42 kN\n",
"Specific thrust: 288.46 N/kg/s\n",
"Thrust power: 4006.47 kW\n",
"Propulsive efficiency: 66.67 %\n",
"Thermal efficiency: 14.32 %\n",
"Overall efficiency: 9.55 %\n",
"Specific fuel consumption: 0.24 kg/h.N\n"
]
}
],
"prompt_number": 8
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 5, page no. 882"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"from __future__ import division\n",
" \n",
"from math import sqrt\n",
"\n",
"#Variable Declaration: \n",
"p1 = 2.2 #Pressures(in bar):\n",
"T1 = 220 #Temperatures(in K):\n",
"T4 = 1273\n",
"C1 = 260 #Velocities(in m/s):\n",
"nn = 0.85 #Nozzle efficiency:\n",
"nt = 0.88 #Turbine efficiency:\n",
"nd = 0.90 #Diffuser efficiency:\n",
"Cp = 1.005#Specific heat(in kJ/kg.K):\n",
"r = 1.4 #Adiabatic index of compression:\n",
"r1 = 12 #Pressure ratio:\n",
"T3a = 568.635\n",
"p6 = 2.2\n",
"\n",
"#Calculations:\n",
"T2 = T1+ C1**2/(2*Cp*1000) #Temperature at state 2(in K):\n",
"p2 = p1*(T2/T1)**(r/(r-1)) #Pressure at state 2(in bar):\n",
"p3 = p2*r1\n",
"p4 = p3\n",
"T3 = T2*(p3/p2)**((r-1)/r)#Temperature at state 3(in K):\n",
"T3a = T2+(T3-T2)/nn #Temperature at state 3'(in K):\n",
"T5a = T4-(T3a-T2) #Temperature at state 5'(in K):\n",
"T4 = T3a -T2 +T5a\n",
"T5 = T4-(T4-T5a)/nt #Temperature of state 5(in K):\n",
"p5 = p4*(T5/T4)**(r/(r-1)) #Pressure at state 5(in bar):\n",
"T6 = T5*(p6/p5)**((r-1)/r)\n",
"T2a = T1+(T2-T1)/nd #Temperature at state 2'(in K):\n",
"C6 = sqrt(2*(T5-T6)*Cp*10**3) #Velocity at exit of nozzle(in m/s):\n",
"\n",
"#Results: \n",
"print \"Velocity of exit of nozzle: \",round(C6,2),\"m/s\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Velocity of exit of nozzle: 873.41 m/s\n"
]
}
],
"prompt_number": 12
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 6, page no. 885"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"from __future__ import division\n",
" \n",
"from math import sqrt\n",
"\n",
"#Variable Declaration: \n",
"CV = 45000 #Calorific value(in kJ/kg):\n",
"T1 = 1000 #Inlet temperature(in C):\n",
"T4 = T1\n",
"nn = 0.9 #Nozzle efficiency:\n",
"nd = 0.9 #Diffuser efficiency:\n",
"nc = 0.8 #Compressive efficiency:\n",
"nt = 0.8 #Turbine efficiency:\n",
"Cp = 1.005 #Specific heat(in kJ/kg.K):\n",
"p3 = 7.248 #bar\n",
"r = 1.4\n",
"p6 = 0.7\n",
"R = 0.287 #Gas constant(in kJ/kg.K):\n",
"T2a = 282.11 #Temperature at state 2(in K):\n",
"T3a = 568.635\n",
"\n",
"#Calculations:\n",
"p4 = p3-0.15\n",
"r1 = (CV-T1*Cp)/(Cp*T1-Cp*T3a) #Air fuel ratio:\n",
"T5a = T4-(T3a-T2a) #Temperature at state 5'(in K):\n",
"T5 = T4-(T4-T5a)/nt #Temperature at state 5(in K):\n",
"p5 = p4*(T5/T4)**(r/(r-1))\n",
"T6 = T5a*(p6/p5)**((r-1)/r) #Temperature at state 6(in K):\n",
"T6a = T5a-(T5a-T6)*nn #Temperature at state 6'(in K):\n",
"C6 = sqrt(2*Cp*(T5a-T6a)*10**3) #Velocity at exit of nozzle(in m/s):\n",
"v = 200/10 #Volume flow rate of air(in m**3/s):\n",
"m = 0.7*10**2*v/(R*260) #Mass flow rate(in kg/s):\n",
"St = (1+1/r1)*C6 #Specific thrust(in N/kg of air/s):\n",
"Tt = m*St #Total thrust(in N):\n",
"\n",
"#Results: \n",
"print \"Specific thrust: \",round(St,2),\"N/kg of air/s\"\n",
"print \"Total thrust: \",round(Tt,2),\"N\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Specific thrust: 508.22 N/kg of air/s\n",
"Total thrust: 9535.07 N\n"
]
}
],
"prompt_number": 14
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 7, page no. 886"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"from __future__ import division\n",
" \n",
"from math import sqrt\n",
"\n",
"#Variable Declaration: \n",
"Cpa = 1.005 #Specific heat(in kJ/kg.K):\n",
"Cpg = 1.087\n",
"ra = 1.4\n",
"rg = 1.33\n",
"R = 0.287 #Gas constant(in kJ/kg.K):\n",
"C0 = 250 #Speed of aeroplane(in m/s):\n",
"C4a = 180 #Velocity at exit of turbine(in m/s):\n",
"CV = 43000 #kJ/kg\n",
"P = 800 #Thrust power(in kW):\n",
"T0 = -20+273 #Temperatures(in K):\n",
"T2 = 474.25 \n",
"T3 = 973\n",
"p0 = 0.3 #Pressures(in bar):\n",
"p1 = 0.31\n",
"nc = 0.85 #Compressor efficiency:\n",
"nj = 0.90 #Jet engine efficiency:\n",
"r1 = 6 #Pressure ratio:\n",
"\n",
"#Calculations:\n",
"p5 = p0\n",
"T1 = T0+C0**2/(2*Cpa*10**3)\t#Temperature at state 2(in K):\n",
"T2a = T1+(T2-T1)/nc\n",
"p2 = p1*r1 #Pressure at state 2(in bar):\n",
"p3 = p2\n",
"FA = (Cpa*T3-Cpg*T2a)/(CV-Cpa*T3) #Fuel air ratio:\n",
"T4a = T3-Cpa/Cpg*(T2a-T1)/(1+FA) #Temperature at state 4'(in K):\n",
"T4 = T3-(T3-T4a)/nc #Temperature at state 4(in K):\n",
"p4 = p3*(T4/T3)**(rg/(rg-1)) #Pressure at state 4(in bar):\n",
"T5 = T4a*(p5/p4)**((rg-1)/rg) #Temperature at state 5(in K):\n",
"C5 = sqrt(2*nj*(Cpg*10**3*(T4a-T5)+C4a**2/2)) #Nozzle exit velocity(in m/s):\n",
"no = (((1+FA)*C5-C0)*C0)/(FA*CV*10**3)*100 #Overall efficiency:\n",
"ma = P*10**3/(((1+FA)*C5-C0)*C0) #Rate of air consumption(in kg/s):\n",
"Pt = ma*(1+FA)*Cpg*(T3-T4a) #Power produced by the turbine(in kW):\n",
"T5a = T4a-((C5**2-C4a**2)/(2*Cpg*10**3)) #Temperature at state 5'(in K):\n",
"d5a = p5*10**2/(R*T5a) #Density of exhaust gases(in m**3/kg):\n",
"Aj = ma*(1+FA)/(C5*d5a) #Jet exit area(in m**2):\n",
"\n",
"#Results: \n",
"print \"Air-fuel ratio: \",round(1/FA,2),\":1\"\n",
"print \"Rate of air consumption: \",round(ma,2),\"kg/s\"\n",
"print \"Power produced by turbine: \",round(Pt,2),\"kW\"\n",
"print \"Jet exit area: \",round(Aj,2),\"m**2\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Air-fuel ratio: 98.67 :1\n",
"Rate of air consumption: 11.99 kg/s\n",
"Power produced by turbine: 2694.84 kW\n",
"Jet exit area: 0.15 m**2\n"
]
}
],
"prompt_number": 16
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 8, page no. 889"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"from __future__ import division\n",
" \n",
"from math import sqrt,pi\n",
"\n",
"#Variable Declaration: \n",
"Ca = 250 #Speed of jet plane(in m/s):\n",
"d = 0.15 #Density of air(in kg/m**3):\n",
"D = 6800 #Drag(in kW):\n",
"np = 0.56 #Propulsive efficiency:\n",
"\n",
"#Calculations:\n",
"Ce = 2*Ca/np-Ca #Relative velocity(in m/s):\n",
"C = Ce-Ca #Absolute velocity of jet(in m/s):\n",
"ma = D/(Ce-Ca) #Mass flow rate(in kg/s):\n",
"v = ma/d #Volume flow rate(in m**3/s):\n",
"dj = sqrt(v*4/(2*pi*Ce)) #Jet diameter(in m):\n",
" \n",
"#Results: \n",
"print \"Jet diamter: \",round(dj*100,1),\"cm\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Jet diamter: 33.8 cm\n"
]
}
],
"prompt_number": 18
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 9, page no. 889"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"from __future__ import division\n",
"\n",
"#Variable Declaration: \n",
"R = 0.287 #Gas constant(in kJ/kg.K):\n",
"r1 = 0.4 #Density ratio:\n",
"Cp = 1.005 #Specific heat(in kJ/kg.K):\n",
"d = 0.018 #Drag coefficient:\n",
"Ce = 550 #Jet velocity(in m/s):\n",
"A = 20 #Wing area(in m**2):\n",
"Ca = 900*1000/3600 #Speed of aeroplane(in m/s):\n",
"d1 = 1.01325*10**2/(R*288) #Density of STP(in kg/m**3):\n",
"d2 = r1*d1 #Density of air at altitude(in kg/m**3):\n",
"T = d*A*d2*Ca**2/2 #Thrust on aeroplane:\n",
"ma = T/(Ce-Ca) #Mass flow rate(in kg/s):\n",
"St = T/ma #Specific thrust(in N/kg of air):\n",
"\n",
"#Results: \n",
"print \"Specific thrust: \",round(St),\"N/kg of air\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Specific thrust: 300.0 N/kg of air\n"
]
}
],
"prompt_number": 20
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 10, page no. 890"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"\n",
"from __future__ import division\n",
" \n",
"from math import sqrt\n",
"\n",
"#Variable Declaration: \n",
"Ca = 250 #Speed of air craft(in m/s):\n",
"m = 55 #Mass flow rate(in kg/s):\n",
"r = 85 #Air fuel ratio:\n",
"nc = 0.96 #Combustion efficiency:\n",
"CV = 43000 #Lower calorific value(in kJ/kg):\n",
"dh = 220 #Isentropic enthalpy change(in kJ/kg):\n",
"n = 0.95 #Velocity coefficient:\n",
"\n",
"#Calculations:\n",
"Ce = n*sqrt(2*dh*10**3)#Jet velocity(in m/s):\n",
"Ce = 615.67\n",
"St = 400.67 #Specific thrust per kg of air(in N/kg air):\n",
"r1 = 1/r*3600*m #Fuel flow rate(in kg/hr):\n",
"sfc = r1/(St*m) #Specific fuel consumption(in kg/N.hr):\n",
"P = m*(Ce-Ca)*Ca/10**3 #Thrust power(in kW):\n",
"Pp = m*(Ce**2-Ca**2)/2/10**3 #Propulsive power(in kW):\n",
"np = P/Pp*100 #Propulsive efficiency:\n",
"no = P/(m/r*CV*nc)*100 #Overall efficiency:\n",
"\n",
"#Results: \n",
"print \"Propulsive power: \",round(Pp,2),\"kW\"\n",
"print \"Propulsive efficiency: \",round(np,2),\"%\"\n",
"print \"Overall efficiency: \",round(no,2),\"%\""
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Propulsive power: 8705.11 kW\n",
"Propulsive efficiency: 57.76 %\n",
"Overall efficiency: 18.82 %\n"
]
}
],
"prompt_number": 22
}
],
"metadata": {}
}
]
}