19. The conditions at point 1 of a constant volume fuel-air cycle are P1=50 kPa and T1=370 K. If Ic=10 and 6=0.8. estimate the actual net indicated fuel conversion efficiency and the indicated specific fuel consumption. Assume that Gb=0.30 kg/m-s, T;=335 K, Pe=101 kPa, Tc = 340 K, Xr = 0.05 and that this is a 4-stroke engine. (Use figure 5-9 to estimate the gross indicated fuel conversion efficiency, nfig. Use figure 5-10 to estimate imep, and to calculate the ideal nf.i,n) 0.65 0.4 0.65 0.5 0.6 0.60 PL - 1.0 atm 7 388 K x, = 0.05 0.60 0.8 1.0 0.55 0.55 0.50 0.50 1.2 W. 0.45 Wi 0.45 0.40 0.40 1.4 24 20 16 0.35 0.35 12 -P 1.0 atm T-388 K 1,-0.05 0.30 8 0.30 6 1.6 0.6 20 0 0.25 0.25 0,4 0.8 1.0 30 1.2 5 10 15 1.4 Compression ratio Fuel/air equivalence ratio Figure 5.9 Fuel-air cycle results for indicated fuel conversion efficiency as a function of compression ratio and equivalence ratio. = 1 atm, T, = 388 K.x, =0.05. (From Edson and Taylor.") Fuel: octene. P. 18 7 ab tot 16 Ti = 388 K x, = 0.05 P1 1.0 atm 14 ro 24 20 16 12 12 8 imep/p1 10 PI = 0.5 atm 6 1.0 2 0.4 0.6 0.8 1.2 1.4 1.6 Fuel/air equivalence ratio o Figure 5.10 Fuel-air cycle results for indicated mean effective pressure as a function of equivalence ratio and compression ratio. Fuel: octene. P. = 1 atm, T = 388 K, X = 0.05. (From Edson and Taylor.) 19. The conditions at point 1 of a constant volume fuel-air cycle are P1=50 kPa and T1=370 K. If Ic=10 and 6=0.8. estimate the actual net indicated fuel conversion efficiency and the indicated specific fuel consumption. Assume that Gb=0.30 kg/m-s, T;=335 K, Pe=101 kPa, Tc = 340 K, Xr = 0.05 and that this is a 4-stroke engine. (Use figure 5-9 to estimate the gross indicated fuel conversion efficiency, nfig. Use figure 5-10 to estimate imep, and to calculate the ideal nf.i,n) 0.65 0.4 0.65 0.5 0.6 0.60 PL - 1.0 atm 7 388 K x, = 0.05 0.60 0.8 1.0 0.55 0.55 0.50 0.50 1.2 W. 0.45 Wi 0.45 0.40 0.40 1.4 24 20 16 0.35 0.35 12 -P 1.0 atm T-388 K 1,-0.05 0.30 8 0.30 6 1.6 0.6 20 0 0.25 0.25 0,4 0.8 1.0 30 1.2 5 10 15 1.4 Compression ratio Fuel/air equivalence ratio Figure 5.9 Fuel-air cycle results for indicated fuel conversion efficiency as a function of compression ratio and equivalence ratio. = 1 atm, T, = 388 K.x, =0.05. (From Edson and Taylor.") Fuel: octene. P. 18 7 ab tot 16 Ti = 388 K x, = 0.05 P1 1.0 atm 14 ro 24 20 16 12 12 8 imep/p1 10 PI = 0.5 atm 6 1.0 2 0.4 0.6 0.8 1.2 1.4 1.6 Fuel/air equivalence ratio o Figure 5.10 Fuel-air cycle results for indicated mean effective pressure as a function of equivalence ratio and compression ratio. Fuel: octene. P. = 1 atm, T = 388 K, X = 0.05. (From Edson and Taylor.)
