1 files changed, 36 insertions, 0 deletions
diff --git a/551/CH11/EX11.18/18.sce b/551/CH11/EX11.18/18.sce
new file mode 100755
index 000000000..014b9ff04
--- /dev/null
+++ b/551/CH11/EX11.18/18.sce
@@ -0,0 +1,36 @@
+clc
+disp("(i) Combustion equation")
+
+// x CH4 + y O2 + z N2 → 10.0 CO2 + 0.53 CO + 2.37 O2 + a H2O + 87.1 N2
+
+z=87.1;
+y=z*(79/21);
+x=10+0.53;
+a=2*x;
+
+//10.53 CH4 + 23.16 O2 + 87.1 N2 → 10.0 CO2 + 0.53 CO + 2.37 O2 + 21.06 H2O + 87.1 N2
+
+disp("CH4 + 2.2 O2 + 8.27 N2 → 0.95 CO2 + 0.05 CO + 2H2O + 0.225 O2 + 8.27 N2")
+
+disp("(ii) Air-fuel ratio ")
+
+AF_mole=2.2+8.27;
+disp("air-fuel ratio on a mole basis =")
+disp(AF_mole)
+disp("moles air/mole fuel")
+
+AF_mass=AF_mole*28.97/(12+1*4);
+disp("air-fuel ratio on a mass basis =")
+disp(AF_mass)
+disp("air/kg fuel")
+
+// CH4 + 2O2 + 2*(79/21)N2 → CO2 + 2H2O + (2)*(79/21)N2
+AF_theor=(2+2*(79/21))*28.97/(12+1*4);
+disp("theoretical air-fuel ratio =")
+disp(AF_theor)
+disp("kg air/kg fuel")
+
+disp("(iii) Percent theoretical air =")
+%theo=AF_mass/AF_theor*100;
+disp(%theo)
+disp("%")
+\ No newline at end of file