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{
"metadata": {
"name": "",
"signature": "sha256:783af12fd7d104e85c7e13e105c7550ca4a0a63a41968e5a9b0312d6fedb23a2"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 22: Theory of Rotodynamic Machine"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 22.1, Page 779"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"import math\n",
"\n",
" #Initializing the variables\n",
"Q = 5;\n",
"R1 = 1.5/2;\n",
"R2 = 2/2; \n",
"w = 18;\n",
"rho = 1000;\n",
"rhoA = 1.2;\n",
"Hth = 0.017;\n",
"g=9.81;\n",
"\n",
" #Calculations\n",
"A = math.pi*(R2**2-R1**2);\n",
"Vf = Q/A;\n",
"Ut = w*R2;\n",
"Uh = w*R1;\n",
"B1t = math.atan(Vf/Ut);\n",
"B1h = math.atan(Vf/Uh);\n",
"E = Hth*rho/rhoA;\n",
"def Beta(u):\n",
" y = math.atan(Vf/(u-E*g/u));\n",
" return y\n",
"B2t = Beta(Ut);\n",
"B2h = Beta(Uh);\n",
"\n",
"print \"!----Blade Inlet Angles----!\"\n",
"print \"At tip (in degrees) :\",round(B1t*180/math.pi,1),\"\\nAt Hub (in degrees) :\",round(B1h*180/math.pi,1)\n",
"print \"\\n!----Blade Outlet Angles (Degrees)----!\"\n",
"print \"At tip (in degrees):\",round(B2t*180/math.pi,1),\"\\nAt Hub(in degrees) :\",round(B2h*180/math.pi,1)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"!----Blade Inlet Angles----!\n",
"At tip (in degrees) : 11.4 \n",
"At Hub (in degrees) : 15.1\n",
"\n",
"!----Blade Outlet Angles (Degrees)----!\n",
"At tip (in degrees): 19.5 \n",
"At Hub(in degrees) : 48.6\n"
]
}
],
"prompt_number": 1
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 22.2, Page 793"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"import math\n",
"\n",
"\n",
" #Initializing the variables\n",
"D = 0.1;\n",
"t = 15*10**-3;\n",
"Q = 8.5/3600;\n",
"N = 750/60;\n",
"B2 = 25*math.pi/180; # Beta 2 ind degrees\n",
"g = 9.81;\n",
"z = 16;\n",
"\n",
" #Calculations\n",
"A = round(math.pi*D*t,5);\n",
"V_f2 = round(Q/A,3);\n",
"U2 = round(math.pi*N*D,3);\n",
"V_w2 = round(U2 - V_f2/math.tan(B2),1);\n",
"Hth = round(U2*V_w2/g,2);\n",
"Sf = round(1 - math.pi*math.sin(B2)/(z*(1-(V_f2/U2)/math.tan(B2))),3);\n",
"H = round(Sf*Hth,2);\n",
"\n",
"print \"Part (a) - Head developed (m): \",Hth\n",
"print \"Part (b) - Head developed (m): \",H"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Part (a) - Head developed (m): 1.16\n",
"Part (b) - Head developed (m): 1.03\n"
]
}
],
"prompt_number": 2
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 22.3, Page 797"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"import math\n",
"\n",
"\n",
" #Initializing the variables\n",
"Ma = 0.6;\n",
"Cl = 0.6;\n",
"tByC = 0.035; # Thickness to chord ratio\n",
"cByC = 0.015; # Camber to chord ratio\n",
"x = 3; # Angle of incidence\n",
"\n",
" #Calculations\n",
"lamda = 1/(1-Ma**2)**0.5;\n",
"Cl# = lamda*Cl;\n",
"tByC1 = tByC*lamda;\n",
"cByC1 = cByC*lamda;\n",
"Cl1 = Cl*lamda**2;\n",
"Ae = x*lamda;\n",
"print \"____Geometric Characterstics____\\n\"\n",
"print \"Thickness to chord ratio :\",tByC1\n",
"print \"Camber to chord ratio :\",cByC1\n",
"print \"Lift Coefficient :\",Cl1\n",
"print \"angle of incidence (Degrees) :\",Ae"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"____Geometric Characterstics____\n",
"\n",
"Thickness to chord ratio : 0.04375\n",
"Camber to chord ratio : 0.01875\n",
"Lift Coefficient : 0.9375\n",
"angle of incidence (Degrees) : 3.75\n"
]
}
],
"prompt_number": 3
}
],
"metadata": {}
}
]
}
|
