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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 /2657/CH18/EX18.14 | |
| download | Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.tar.gz Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.tar.bz2 Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.zip | |
initial commit / add all books
Diffstat (limited to '2657/CH18/EX18.14')
| -rwxr-xr-x | 2657/CH18/EX18.14/Ex18_14.sce | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/2657/CH18/EX18.14/Ex18_14.sce b/2657/CH18/EX18.14/Ex18_14.sce new file mode 100755 index 000000000..4299d7239 --- /dev/null +++ b/2657/CH18/EX18.14/Ex18_14.sce @@ -0,0 +1,25 @@ +//Calculations on petrol engine
+clc,clear
+//Given:
+n=6 //Number of cylinders
+d=70,l=100 //Bore and stroke in mm
+V_c=67 //Clearance volume in cm^2
+N=3960 //Engine speed in rpm
+m_f=19.5 //Fuel consumption in kg/hr
+T=140 //Brake torque delivered in Nm
+CV=44000 //Calorific value in kJ/kg
+g=1.4 //Specific heat ratio for air (gamma)
+//Solution:
+bp=2*%pi*N/60*T*10^-3 //Brake power in kW
+A=%pi/4*d^2*10^-6 //Area of cylinder in m^2
+bmep=bp*1000/(n*l/1000*A*N/(2*60)) //Brake mean effective pressure in Pascal
+eta_bt=bp*3600/(m_f*CV) //Brake thermal efficiency
+V_s=(%pi/4)*d^2*l/1000 //Swept volume of one cylinder in cm^3
+r=(V_s+V_c)/V_c //Compression ratio
+eta=1-1/r^(g-1) //Air standard efficiency
+eta_r=eta_bt/eta //Relative efficiency
+//Results:
+printf("\n (a)The brake power, bp = %d kW",bp)
+printf("\n (b)The brake mean effective pressure, bmep = %.2f bar",bmep*10^-5)
+printf("\n (c)The brake thermal efficiency, eta_bt = %.1f percent",eta_bt*100)
+printf("\n (d)The relative efficiency, eta_r = %.1f percent\n\n",eta_r*100)
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