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-{
- "metadata": {
- "name": "",
- "signature": "sha256:b809e6889d9fdf33446744d4f1caf3aac2e77607182761aeef234f4a6cc34adc"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
- {
- "cells": [
- {
- "cell_type": "heading",
- "level": 2,
- "metadata": {},
- "source": [
- "Chapter : Turbomachines"
- ]
- },
- {
- "cell_type": "heading",
- "level": 3,
- "metadata": {},
- "source": [
- "Example 12.1 Page no 443"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "from math import *\n",
- "\n",
- "from __future__ import division\n",
- "\n",
- "\n",
- "Q = 0.25 # discharge from the pump in m**3/s\n",
- "\n",
- "gma= 0.8*9810 # specific weight in kg/m**3\n",
- "\n",
- "H=25 # elevation head in m\n",
- "\n",
- "T = 350 # Torque to drive the shaft in Nm\n",
- "\n",
- "N = 1800 # Speed in RPM\n",
- "\n",
- "w = 2*pi*N/60 # angular velocity\n",
- "\n",
- "\n",
- "Eff = gma*Q*H*100/(T*w) # efficiency\n",
- "\n",
- "print \"Efficiency of th pump =\",round(Eff,0),\"%\""
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Efficiency of th pump = 74.0 %\n"
- ]
- }
- ],
- "prompt_number": 1
- },
- {
- "cell_type": "heading",
- "level": 3,
- "metadata": {},
- "source": [
- "Example 12.2 Page no 447"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "from math import *\n",
- "\n",
- "from __future__ import division\n",
- "\n",
- "\n",
- "d = 0.4 # diameter of the pump in m\n",
- "\n",
- "b = 0.03 # width in m\n",
- "\n",
- "theta = pi/3 # blade angle\n",
- "\n",
- "N = 1500 # speed in RPM\n",
- "\n",
- "Q = 0.4 # flow rate in m**3/s\n",
- "\n",
- "g = 9.81 # acceleration due to gravity in m/s**2\n",
- "\n",
- "\n",
- "w = 2*pi*N/60 # anggular velocity in rad/s\n",
- "\n",
- "u2 = (d/2)*w # blade velocity in m/s\n",
- "\n",
- "V2r = Q/(2*pi*(d/2)*b) # relative velocity in m/s\n",
- "\n",
- "print \"(a)\"\n",
- "\n",
- "print \"Radial velocity at exit =\",round(V2r,1),\"m/s\"\n",
- "\n",
- "V2t = u2 - V2r*(cos(theta)/sin(theta))\n",
- "\n",
- "print \"Whirl velocity = \",round(V2t,1),\"m/s\"\n",
- "\n",
- "v2 = V2r/sin(theta)\n",
- "\n",
- "print \"Relative velocity = \",round(v2,2),\"m/s\"\n",
- "\n",
- "V2 = sqrt(V2t**2+V2r**2)\n",
- "\n",
- "print \"Actual velocity =\",round(V2,2),\"m/s\"\n",
- "\n",
- "print \"(b)\"\n",
- "\n",
- "H = u2*V2t/g\n",
- "\n",
- "print\"Head added for no inlet whirl =\",round(H,0),\"m\"\n",
- "\n",
- "print \"(c)\"\n",
- "\n",
- "P = g*Q*H\n",
- "\n",
- "print \"Power required =\",round(P,1),\"kW\""
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- " (a)\n",
- "Radial velocity at exit = 10.6 m/s\n",
- "Whirl velocity = 25.3 m/s\n",
- "Relative velocity = 12.25 m/s\n",
- "Actual velocity = 27.43 m/s\n",
- "(b)\n",
- "Head added for no inlet whirl = 81.0 m\n",
- "(c)\n",
- "Power required = 317.8 kW\n"
- ]
- }
- ],
- "prompt_number": 3
- },
- {
- "cell_type": "heading",
- "level": 3,
- "metadata": {},
- "source": [
- "Example 12.3 Page no 450"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "from math import *\n",
- "\n",
- "from __future__ import division\n",
- "\n",
- "\n",
- "d = 0.36 # diameter of the impeller of pump\n",
- "\n",
- "N = 1500 # Speed of impeller in RPM\n",
- "\n",
- "\n",
- "\n",
- "Q1 = 82 # discharge in l/s\n",
- "\n",
- "H1 = 17.5 # Head in m\n",
- "\n",
- "Eta = 0.8 # efficiency \n",
- "\n",
- "Q2 = 100 # discharge in l/s\n",
- "\n",
- "H2 = 20 # head in m\n",
- "\n",
- "\n",
- "D2 = 38.45\n",
- "\n",
- "print \"Impeller size =\",round(D2,2),\"cm\"\n",
- "\n",
- "N2 = 1500 \n",
- "\n",
- "print \"Speed of the pump =\",round(N2,0),\"RPM\""
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Impeller size = 38.45 cm\n",
- "Speed of the pump = 1500.0 RPM\n"
- ]
- }
- ],
- "prompt_number": 4
- },
- {
- "cell_type": "heading",
- "level": 3,
- "metadata": {},
- "source": [
- "Example 12.4 Page no 454 "
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "from math import *\n",
- "\n",
- "from __future__ import division\n",
- "\n",
- "\n",
- "q = 500 # discharge in cgm\n",
- "\n",
- "Q = 500/449 # discharge in ft**3/s\n",
- "\n",
- "D = 0.667 # diameter in ft\n",
- "\n",
- "A = pi*D**2/4\n",
- "\n",
- "V = Q/A # velocity in ft/s\n",
- "\n",
- "g = 32.2 # acceleration due to gravity in ft/s**2\n",
- "\n",
- "N = 1800 # speed in RPM\n",
- "\n",
- "\n",
- "\n",
- "nu = 1.134*10**-5 # viscosity in ft**2/s\n",
- "\n",
- "e = 0.00085 # epssilon in ft\n",
- "\n",
- "r = 0.001275 \n",
- "\n",
- "R = V*D/nu # reynolds no\n",
- "\n",
- "f = 0.022 # from moody's diagram\n",
- "\n",
- "Hl = V**2*(12.1+(f*224.9))/64.4\n",
- "\n",
- "hs = 119.4 + Hl\n",
- "\n",
- "print \"Discharge, Q = \",round(Q,2),\"ft**3/s\"\n",
- "print \"Dynamic head of the pump, H =\",round(hs,1),\"m\"\n",
- "\n",
- "Ns = N*sqrt(q)/(hs)**(3/4)\n",
- "\n",
- "print \"Specific speed of the pump, Ns =\",round(Ns,0),\"RPM\""
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Discharge, Q = 1.11 ft**3/s\n",
- "Dynamic head of the pump, H = 122.1 m\n",
- "Specific speed of the pump, Ns = 1096.0 RPM\n"
- ]
- }
- ],
- "prompt_number": 5
- },
- {
- "cell_type": "heading",
- "level": 3,
- "metadata": {},
- "source": [
- "Example 12.5 Page no 457"
- ]
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [
- "\n",
- "from math import *\n",
- "\n",
- "from __future__ import division\n",
- "\n",
- "\n",
- "H = 60 # height in m\n",
- "\n",
- "Pb = 98*10**3 # barometric pressure in N/m**2\n",
- "\n",
- "Hl = 1 # head in m\n",
- "\n",
- "Pv = 1707 # vapour pressure \n",
- "\n",
- "sigma = 0.08\n",
- "\n",
- "w = 9810 # specific weight\n",
- "\n",
- "\n",
- "Npsh_m = sigma*60 # minimum NPSH\n",
- "\n",
- "Hsm = (Pb/w)-(Pv/w)-Npsh_m-Hl\n",
- "\n",
- "print \"Minimum value of static suction lift = \",round(Hsm,2),\"m\""
- ],
- "language": "python",
- "metadata": {},
- "outputs": [
- {
- "output_type": "stream",
- "stream": "stdout",
- "text": [
- "Minimum value of static suction lift = 4.02 m\n"
- ]
- }
- ],
- "prompt_number": 6
- },
- {
- "cell_type": "code",
- "collapsed": false,
- "input": [],
- "language": "python",
- "metadata": {},
- "outputs": []
- }
- ],
- "metadata": {}
- }
- ]
-} \ No newline at end of file
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