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| author | hardythe1 | 2015-01-28 14:31:21 +0530 |
|---|---|---|
| committer | hardythe1 | 2015-01-28 14:31:21 +0530 |
| commit | 9add422993fb2649287260bc91d429a07d1810d5 (patch) | |
| tree | ef48c2b2579e65b982d3f700c4fa76b81d2496c1 /Mechanical_Engineering_Thermodynamics/Chapter_18.ipynb | |
| parent | 6e3407ba85ae84e1cee1ae0c972fd32c5504d827 (diff) | |
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| -rwxr-xr-x | Mechanical_Engineering_Thermodynamics/Chapter_18.ipynb | 131 |
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diff --git a/Mechanical_Engineering_Thermodynamics/Chapter_18.ipynb b/Mechanical_Engineering_Thermodynamics/Chapter_18.ipynb new file mode 100755 index 00000000..7131f2a7 --- /dev/null +++ b/Mechanical_Engineering_Thermodynamics/Chapter_18.ipynb @@ -0,0 +1,131 @@ +{
+ "metadata": {
+ "name": ""
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+ {
+ "cells": [
+ {
+ "cell_type": "heading",
+ "level": 1,
+ "metadata": {},
+ "source": [
+ "Chapter 18 - Turbines"
+ ]
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 1 - Pg 336"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#calculate work done, axial thrust and nozzle bucket efficiency\n",
+ "#initialization of varaibles\n",
+ "import math\n",
+ "drop=50. #B/lb\n",
+ "cv=0.95\n",
+ "Vb=700. #fps\n",
+ "alpha=20.*math.pi/180. #radians\n",
+ "beta=30.*math.pi/180. #radians\n",
+ "Cb=0.95\n",
+ "#calculations\n",
+ "V1=cv*math.sqrt(2*32.2*778*drop)\n",
+ "y1=V1*math.cos(alpha)\n",
+ "z1=V1*math.sin(alpha)\n",
+ "y1R=y1-Vb\n",
+ "V1R=math.sqrt(y1R*y1R + z1*z1)\n",
+ "V2R=Cb*V1R\n",
+ "y2R=-V2R*math.cos(beta)\n",
+ "z2=V2R*math.sin(beta)\n",
+ "Wx=(y1R-y2R)*Vb/32.2\n",
+ "Fa=(z1-z2)/32.2\n",
+ "Vc=1582.77\n",
+ "etanb=Wx/(Vc*Vc /(2*32.2))\n",
+ "#results\n",
+ "print '%s %d %s' %(\"Work per pound of fluid =\",Wx,\"ft lbf/lbm\")\n",
+ "print '%s %.1f %s' %(\"\\n Axial thrust =\",Fa,\"lbf/lbm/sec\")\n",
+ "print '%s %.2f' %(\"\\n Nozzle bucket efficiency = \",etanb)\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "Work per pound of fluid = 31221 ft lbf/lbm\n",
+ "\n",
+ " Axial thrust = 3.0 lbf/lbm/sec\n",
+ "\n",
+ " Nozzle bucket efficiency = 0.80\n"
+ ]
+ }
+ ],
+ "prompt_number": 1
+ },
+ {
+ "cell_type": "heading",
+ "level": 2,
+ "metadata": {},
+ "source": [
+ "Example 2 - Pg 349"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "collapsed": false,
+ "input": [
+ "#Calculate the internal efficiency and the reheat factor\n",
+ "#initialization of varaibles\n",
+ "ha=1187.2 #B/lb\n",
+ "sa=1.6026 #B/lb R\n",
+ "h3s=895 #B/lb\n",
+ "h1s=1090 #B/lb\n",
+ "p1=28 #psia\n",
+ "h2s=993 #B/lb\n",
+ "p2=6.2 #psia\n",
+ "n=0.65\n",
+ "#calculations\n",
+ "print '%s' %(\"From Table 3,\")\n",
+ "h1=ha-n*(ha-h1s)\n",
+ "s1=1.65 #B/lb R\n",
+ "h2dash=1024 #B/lb\n",
+ "h2=h1-n*(h1-h2dash)\n",
+ "s2=1.706 #B/lb R\n",
+ "h3dash=953. #B/lb\n",
+ "h3=h2-n*(h2-h3dash)\n",
+ "etaT=(ha-h3)/(ha-h3s)\n",
+ "reheat=etaT/n\n",
+ "#results\n",
+ "print '%s %.3f' %(\"Internal efficiency = \",etaT)\n",
+ "print '%s %.2f' %(\"\\n Reheat factor = \",reheat)\n"
+ ],
+ "language": "python",
+ "metadata": {},
+ "outputs": [
+ {
+ "output_type": "stream",
+ "stream": "stdout",
+ "text": [
+ "From Table 3,\n",
+ "Internal efficiency = 0.675\n",
+ "\n",
+ " Reheat factor = 1.04\n"
+ ]
+ }
+ ],
+ "prompt_number": 2
+ }
+ ],
+ "metadata": {}
+ }
+ ]
+}
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