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diff --git a/Internal_Combustion_Engines_by_H._B._Keswani/ch16.ipynb b/Internal_Combustion_Engines_by_H._B._Keswani/ch16.ipynb new file mode 100755 index 00000000..8a8ad89d --- /dev/null +++ b/Internal_Combustion_Engines_by_H._B._Keswani/ch16.ipynb @@ -0,0 +1,178 @@ +{ + "metadata": { + "name": "", + "signature": "sha256:188e5ca03e48e521630f0518a9d462567af55f5cfab6623682e9d579c84b2da8" + }, + "nbformat": 3, + "nbformat_minor": 0, + "worksheets": [ + { + "cells": [ + { + "cell_type": "heading", + "level": 1, + "metadata": {}, + "source": [ + "Chapter 16 : Combustion In Compresson Ignition Engines" + ] + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 16.1 Page no : 315" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math \n", + "from numpy import array\n", + "\t\t\t\t\t\n", + "#Input data\n", + "s = 0.005\t\t\t\t\t#Delay in sec\n", + "d = 30.\t\t\t\t\t#Bore in cm\n", + "N = 600.\t\t\t\t\t#Speed in r.p.m\n", + "dx = array([10,15,20])\t\t\t\t\t#Bore diameters in cm\n", + "\n", + "\t\t\t\t\t\n", + "#Calculations\n", + "t = (s/d)*dx\t\t\t\t\t#Time of delay in sec. In textbook, t[1] is given wrong as 0.00025 sec instead of 0.0025 sec\n", + "\n", + "\t\t\t\t\t\n", + "#Output\n", + "print 'The delay time for %i cm diameter bore is %3.5f sec \\\n", + "\\nThe delay time for %i cm diameter bore is %3.5f sec \\\n", + "\\nThe delay time for %i cm diameter bore is %3.5f sec'%(dx[0],t[0],dx[1],t[1],dx[2],t[2])\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "The delay time for 10 cm diameter bore is 0.00167 sec \n", + "The delay time for 15 cm diameter bore is 0.00250 sec \n", + "The delay time for 20 cm diameter bore is 0.00333 sec\n" + ] + } + ], + "prompt_number": 1 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 16.2 Page no : 317" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math \n", + "\t\t\t\t\t\n", + "#Input data\n", + "d = [15.,60.]\t\t\t\t\t#Bore in cm\n", + "N = [1600.,400.]\t\t\t\t\t#Speed in r.p.m respectively\n", + "q = 30.\t\t\t\t\t#Injection of oil occupies 30 degrees of crank travel in each case\n", + "pc = 30.\t\t\t\t\t#Compression pressure in kg/cm**2\n", + "d = 0.001\t\t\t\t\t#Delay time in sec\n", + "rp = 5.\t\t\t\t\t#Rapid combustion period is 5 degree of crank travel\n", + "pe = 60.\t\t\t\t\t#Compression pressure at the end of rapid compression in kg/cm**2\n", + "\n", + "\t\t\t\t\t\n", + "#Calculations\n", + "\t\t\t\t\t#For small engine\n", + "It1 = (60/N[0])*(q/360)\t\t\t\t\t#Injection time in sec\n", + "pf1 = ((d/It1)+(rp/pc))*100\t\t\t\t\t#Percent fuel\n", + "\t\t\t\t\t#For large engine\n", + "It2 = (60/N[1])*(q/360)\t\t\t\t\t#Injection time in sec\n", + "pf2 = ((d/It2)+(rp/pc))*100\t\t\t\t\t#Percent fuel\n", + "pr = (pc*(pf2/pf1))\t\t\t\t\t#Pressure rise in kg/cm**2\n", + "mp = (pc+pr)\t\t\t\t\t#Maximum pressure in kg/cm**2\n", + "\n", + "\t\t\t\t\t\n", + "#Output\n", + "print 'Pressure in the large engine is %3.1f kg/cm**2'%(mp)\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Pressure in the large engine is 45.2 kg/cm**2\n" + ] + } + ], + "prompt_number": 3 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 16.3 Page no : 320" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "import math \n", + "\t\t\t\t\t\n", + "#Input data\n", + "n = 4.\t\t\t\t\t#Number of cylinders\n", + "d = 105.\t\t\t\t\t#Bore in mm\n", + "l = 127.\t\t\t\t\t#Stroke in mm\n", + "BHP = 63.\t\t\t\t\t#Brake horse power in h.p\n", + "N = 1800.\t\t\t\t\t#Speed in r.p.m\n", + "t = 15.\t\t\t\t\t#Test time in min\n", + "mf = 2.75\t\t\t\t\t#Mass of fuel in kg\n", + "CV = 11000.\t\t\t\t\t#Calorific value in kcal/kg\n", + "af = 14.8\t\t\t\t\t#Air fuel ratio\n", + "v = 0.805\t\t\t\t\t#Specific volume in m**3/kg\n", + "nv = 80.\t\t\t\t\t#Volumetric efficiency in percent\n", + "J = 427.\t\t\t\t\t#Mechanical equivalent of heat in kg.m/kcal\n", + "\n", + "\t\t\t\t\t\n", + "#Calculations\n", + "bth = ((BHP*4500)/(J*(mf/t)*CV))*100\t\t\t\t\t#Brake thermal efficiency in percent\n", + "Vs = ((3.14/4)*(d/10)**2*(l/10))\t\t\t\t\t#Stroke volume in c.c\n", + "Vsw = (Vs*n*(N/2)*t)\t\t\t\t\t#Swept volume in c.c\n", + "Va = (Vsw*10**-6*(nv/100))\t\t\t\t\t#Volume of air sucked in m**3\n", + "wa = (Va/v)\t\t\t\t\t#Weight of air sucked in kg\n", + "wr = (af*mf)\t\t\t\t\t#Weight of air reqired in kg\n", + "pei = (wr/wa)*100\t\t\t\t\t#Percentage of air available for combustion\n", + "\n", + "\t\t\t\t\t\n", + "#Output\n", + "print 'Brake thermal efficiency is %3.1f percent \\\n", + "\\nThe percentage of air used for combustion is %i percent'%(bth,pei)\n", + "\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Brake thermal efficiency is 32.9 percent \n", + "The percentage of air used for combustion is 69 percent\n" + ] + } + ], + "prompt_number": 5 + } + ], + "metadata": {} + } + ] +}
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