diff options
Diffstat (limited to '2063/CH8/EX8.3/8_3.sce')
| -rwxr-xr-x | 2063/CH8/EX8.3/8_3.sce | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/2063/CH8/EX8.3/8_3.sce b/2063/CH8/EX8.3/8_3.sce new file mode 100755 index 000000000..5f6f00c74 --- /dev/null +++ b/2063/CH8/EX8.3/8_3.sce @@ -0,0 +1,26 @@ +clc
+clear
+//Input data
+P1=12;//Inlet pressure of steam nozzle in bar
+T1=250;//Inlet temperature of steam nozzle in degrees celcius
+P2=2;//Final pressure of the steam nozzle in bar
+n=1.3;//Polytropic constant for superheated steam
+St=6.831;//For isentropic expansion, entropy remains constant in kJ/kg
+h1=2935.4//Enthalpy of steam at P1 from steam table in kJ/kg
+ht=2860;//Enthalpy of steam at pt in kJ/kg
+vt=0.325;//Specific volume of steam at the throat conditions in m^3/kg
+m=0.2;//Mass of steam discharged through the nozzle in kg/hour
+q=0.947;//The dryness fraction of steam at exit from steam tables
+hg=2589.6;//Enthalpy of steam at exit in kJ/kg
+vs=0.8854;//Specific volume of saturated steam in m^3/kg
+
+//Calculations
+pt=(P2/(n+1))^(n/(n-1))*P1;//Critical pressure ratio i.e.,Throat pressure in bar
+Vt=(2*1000*(h1-ht))^(0.5);//Velocity of steam at throat in m/s
+At=((m*vt)/Vt)*10^4;//Area of the throat in cm^2 from continuity equation
+ve=q*vs;//Specific volume of steam at exit in m^3/kg
+Ve=(2*1000*(h1-hg))^(0.5);//Velocity of steam at nozzle exit in m/s
+Ae=((m*ve)/Ve)*10^4;//Exit area in cm^2
+
+//Output
+printf('(a)Throat area of steam nozzle is %3.3f cm^2\n (b)Exit area of steam nozzle is %3.3f cm^2\n (c)Exit velocity of the nozzle is %3.1f m/s',At,Ae,Ve)
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