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"cells": [
{
"cell_type": "heading",
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"metadata": {},
"source": [
"Chapter 14 : Similarity Laws and Factors for Turbomachines"
]
},
{
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"level": 2,
"metadata": {},
"source": [
"Example 14.1 Page No : 479"
]
},
{
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"input": [
"import math\n",
"\n",
"#Initialization of variables\n",
"g = 9.81 \t#kN/m**3\n",
"Q = 3.2 \t#m**3/s\n",
"h = 25 \t#m\n",
"eta = 0.82\n",
"\t\n",
"#calculations\n",
"bp = g*Q*h/eta\n",
"\t\n",
"#Results\n",
"print \"Brake power = %d kW\"%(bp)\n",
"\n",
"#Initialization of variables\n",
"D1 = 50.\n",
"n1 = 1450.\n",
"n2 = 1200.\n",
"D2 = 80.\n",
"Q1 = 3.2 \t#cfs\n",
"h1 = 25. \t#m\n",
"g = 9.81 \t#kN/m**3\n",
"eta = 0.82\n",
"\t\n",
"#calculations\n",
"h2 = h1*(D2/D1)**2 *(n2/n1)**2\n",
"Q2 = Q1*(D2/D1)**3 *(n2/n1)\n",
"bp = g*Q2*h2/eta\n",
"h1 = 82. \t #ft\n",
"Q1 = 50700. \t#gpm\n",
"h2 = 143.8 \t#ft\n",
"Q2 = 171800 \t#gpm\n",
"Ns1 = n1*math.sqrt(Q1) /h1**(3/4.) \n",
"Ns2 = n2*math.sqrt(Q2) /h2**(3/4.) \n",
"\t\n",
"#Results\n",
"print \"Brake power = %d kW\"%(round(bp,-1))\n",
"print \"Pumps are homologous. We expect them to have same specific speed and their speeds are %.1f and \\\n",
"%.1f\"%(round(Ns1,-1),round(Ns2,-1))\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Brake power = 957 kW\n",
"Brake power = 5690 kW\n",
"Pumps are homologous. We expect them to have same specific speed and their speeds are 11980.0 and 11980.0\n"
]
}
],
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}
],
"metadata": {}
}
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