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{
"metadata": {
"name": "",
"signature": "sha256:2908f0a1b2b0285d41bf32a20f608ca01130c6319cf5323377325757350f1f8a"
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{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 4 : Fuel Air Cycles And Real Cycles"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 4.1 Page no : 100"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"import math \n",
"\t\t\t\t\t\n",
"#Input data\n",
"d = 20.\t\t\t\t\t#Bore in cm\n",
"l = 38.\t\t\t\t\t#Stroke in cm\n",
"Vc = 900.\t\t\t\t\t#Clearance volume in c.c\n",
"p1 = 1.\t\t\t\t\t#Pressure at the start of compression stroke in kg/cm**2\n",
"T1 = 90.+273\t\t\t\t\t#Temperature at the start of compression stroke in K\n",
"x = 0.75\t\t\t\t\t#Piston travelled 0.75 of the compression stroke\n",
"n = 1.32\t\t\t\t\t#Compression curve index\n",
"wa = 0.0125\t\t\t\t\t#Weight of air in kg\n",
"\n",
"\t\t\t\t\t\n",
"#Calculations\n",
"Vs = (3.14/4)*d**2*l\t\t\t\t\t#Swept volume in c.c\n",
"V1 = (Vs+Vc)\t\t\t\t\t#Volume in c.c\n",
"V2 = (1-x)*Vs+Vc\t\t\t\t\t#Volume in c.c\n",
"p2 = p1*(V1/V2)**n\t\t\t\t\t#Pressure in kg/cm**2\n",
"T2 = (T1*(p2/p1)*(V2/V1))\t\t\t\t\t#Temperature in K\n",
"W = ((p1*V1-p2*V2)/(n-1))*10**-2\t\t\t\t\t#Workdone in kg.m\n",
"dI = wa*0.17*(T2-T1)\t\t\t\t\t#Change in internal energy in kcal\n",
"q = (dI+(W/427))\t\t\t\t\t#Heat in kcal\n",
"\n",
"\t\t\t\t\t\n",
"#Output\n",
"print 'When the cylinder has travelled %3.2f of the compression stroke, \\\n",
"\\nThe volume is %3.0f c.c \\\n",
"\\nThe pressure is %3.2f kg/cm**2 \\\n",
"\\nTemperature is %3.0f K \\\n",
"\\nThe workdone on the gas is %3.2f kg.m \\\n",
"\\nChange in internal energy between the two points is %3.3f kcal'%(x,V2,p2,T2,W,dI)\n"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"When the cylinder has travelled 0.75 of the compression stroke, \n",
"The volume is 3883 c.c \n",
"The pressure is 4.84 kg/cm**2 \n",
"Temperature is 532 K \n",
"The workdone on the gas is -186.85 kg.m \n",
"Change in internal energy between the two points is 0.359 kcal\n"
]
}
],
"prompt_number": 1
}
],
"metadata": {}
}
]
}
|
