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| author | priyanka | 2015-06-24 15:03:17 +0530 |
|---|---|---|
| committer | priyanka | 2015-06-24 15:03:17 +0530 |
| commit | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (patch) | |
| tree | ab291cffc65280e58ac82470ba63fbcca7805165 /1226/CH17/EX17.40/EX17_40.sce | |
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initial commit / add all books
Diffstat (limited to '1226/CH17/EX17.40/EX17_40.sce')
| -rwxr-xr-x | 1226/CH17/EX17.40/EX17_40.sce | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/1226/CH17/EX17.40/EX17_40.sce b/1226/CH17/EX17.40/EX17_40.sce new file mode 100755 index 000000000..61569e101 --- /dev/null +++ b/1226/CH17/EX17.40/EX17_40.sce @@ -0,0 +1,34 @@ +clc;funcprot(0);//EXAMPLE 17.40
+// Initialisation of Variables
+n=6;................//No of cylinders
+D=0.1;...............//Engine bore in m
+L=0.14;...............//Engine stroke in m
+N=2500;...............//Engine rpm
+k=0.5;..................//Four stroke
+bl=480;.................//Brake load in N
+br=76;..................//Barometer reading in cm of Hg
+d0=3.3/100;..............//Orifice diameter in m
+Cd=0.62;.................//Co efficient of discharge of orifice
+pd=14;...................//Pressure drop across orifice in cm of Hg
+tr=25;...............//Room temperature in C
+mf=0.32;................//Fuel consumption in kg/min
+rhohg=13600;.................//Density of Hg in kg/m^3
+R=0.287;...................//gas constant in kJ/kgK
+g=9.81;.................//Acceleration due to gravity in m/s^2
+CD=17000;....................//dynamometer constant
+//Calculations
+Vs=(%pi/4)*D*D*L*(N/2)*(n/60);..............//Swept volume in m^3
+br1=(br/100)*rhohg*g*(10^-3);.............//Barometer reading into kN/m^2
+rhoa=br1/(R*(tr+273));...............//Density of air
+pd1=(pd/100)*rhohg*g;......................//Conversion of pd into N/m^2
+ha=pd1/(rhoa*g);.......................//Head of air causing flow in m
+Va=Cd*(%pi/4)*d0*d0*sqrt(2*g*ha);............//Volume of air passing through orifice of air box per min
+etav=Va/Vs;....................//Volumetric efficiency
+disp(etav*100,"Volumetric efficiency in %:")
+BP=bl*(N/CD);................//Brake power in kW
+pmb=(BP*6)/(L*D*D*k*10*N*n*(%pi/4));................//Brake mean effective pressure in bar
+disp(pmb,"Brake mean effective pressure (in bar):")
+T=(BP*60*1000)/(2*%pi*N);....................//Engine torque in N-m
+disp(T,"Engine torque in N-m:")
+bsfc=(mf*60)/BP;.......................//Brake specific fuel consumption in kg/kWh
+disp(bsfc,"Brake specific fuel consumption in kg/kWh:")
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