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Diffstat (limited to '1226/CH17/EX17.14/EX17_14.sce')
| -rwxr-xr-x | 1226/CH17/EX17.14/EX17_14.sce | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/1226/CH17/EX17.14/EX17_14.sce b/1226/CH17/EX17.14/EX17_14.sce new file mode 100755 index 000000000..95830edb8 --- /dev/null +++ b/1226/CH17/EX17.14/EX17_14.sce @@ -0,0 +1,22 @@ +clc;funcprot(0);//EXAMPLE 17.14
+// Initialisation of Variables
+BP=14.7;........................//Brake power in kW
+p1=0.9;.........................//Suction pressure in bar
+etamech=0.8;....................//Mechanical efficiency
+r=5;............................//Compression ratio
+p3=24;..........................//maximum explosion pressure in bar
+N=1000;.........................//Engine rpm
+rld=1.5;........................//Ratio of length and stroke
+ic=1.35;........................//Index of compression curve
+ie=1.3;.........................//Index of expansion curve
+k=0.5;..........................//Four stroke engine
+//calculations
+p2=(r^ic)*p1;......................//intermediate pressure (in bar) during compression
+p4=p3/(r^ie);......................//Intermediate pressure (in bar) during expansion
+pm=((((p3-r*p4)/(ie-1))-((p2-p1*r)/(ic-1)))*(10^5))/(r-1);...........//Mean effective pressure in N/m^2
+pmb=pm/100000;........................................//Mean effective pressure in bar
+IP=BP/etamech;........................................//Indicated power in kW
+D=((IP*6*4)/(pmb*rld*(%pi)*N*k*10))^(1/3);............//Engine bore in m
+L=rld*D;..............................................//Engine stroke in m
+disp(D*1000,"Engine bore (in mm):")
+disp(L*1000,"Engine stroke (in mm):")
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