2 files changed, 54 insertions, 0 deletions
diff --git a/3685/CH21/EX21.6/Ex21_6.sce b/3685/CH21/EX21.6/Ex21_6.sce
new file mode 100644
index 000000000..3ff59bb5e
--- /dev/null
+++ b/3685/CH21/EX21.6/Ex21_6.sce
@@ -0,0 +1,47 @@
+clc
+// Given that
+p1 = 0.56 // Ambient pressure in bar
+t1 = 260 // Ambient temperature in K
+r_p = 6 // Pressure ratio of compressor
+n_c = 0.85 // Efficiency of compressor
+v = 360 // Speed of aircraft in km/h
+d = 3 // Propeller diameter in m
+n_p = 0.8 // Propeller efficiency
+n_g = 0.95 // Gear reduction efficiency
+r_e = 5 // Expansion ratio
+n_t = 0.88 // Turbine efficiency
+t3 = 1100 // Temperature at the entrance of turbine in K
+n_n = 0.9 // Nozzle efficiency
+cv = 40 // Calorific value in MJ/kg
+printf("\n Example 21.6\n")
+gama = 1.4 // Heat capacities ratio for air
+Vo = v*(5/18)
+p2 = p1*r_p
+t2_s = t1*((r_p)^(0.286))
+t2 = t1+((t2_s-t1)/n_c)
+Cp = 1.005 // The value of heat capacity of air as given in the book in kJ/kgK
+Wc = Cp*(t2-t1)
+m_f = (t3-t2)/((cv*1000/Cp)-t3)
+m_a = 1/m_f
+p3=p2
+p4 = p3/r_e
+t4_s = t3/((r_e)^(0.286))
+t4 = t3-((t3-t4_s)*n_t)
+Wt = (1+m_f)*(t3-t4)*Cp
+Pp = Wt-Wc
+p5 = p1
+t5_s = t4/((p4/p5)^((gama-1)/gama))
+Vj = sqrt(2*Cp*1000*(t4-t5_s)*n_n)
+Ft = (1+m_f)*Vj-1*Vo
+V = Vo/n_p
+V4 = 2*V-Vo
+Q = (%pi/4)*(d^2)*V
+Pt = (1/2)*(p1*(10^5)/(287*t1))*Q*((V4^2)-(Vo^2))/1000
+PT = Pt/n_g
+ma_c = PT/Pp
+Fp = Pt*n_p/V
+printf("\n Air-fuel ratio = %f,\n Thrust power of the propeller = %f kJ/s ,\n Thrust by the propeller = %f kN,\n Mass flow rate of air flowing through the compressor = %f kg/s,",m_a,Pt,Fp,ma_c)
+// The answers are given in the book contain calculation error.
+
+
+
diff --git a/3685/CH21/EX21.6/Ex21_6.txt b/3685/CH21/EX21.6/Ex21_6.txt
new file mode 100644
index 000000000..150e6c99d
--- /dev/null
+++ b/3685/CH21/EX21.6/Ex21_6.txt
@@ -0,0 +1,7 @@
+ 
+ Example 21.6
+
+ Air-fuel ratio = 60.922165,
+ Thrust power of the propeller = 4144.338339 kJ/s ,
+ Thrust by the propeller = 26.523765 kN,
+ Mass flow rate of air flowing through the compressor = 27.435823 kg/s, 
+\ No newline at end of file