Question

consider a four-cylinder, four-stroke, compression ignition engine with a compression ratio of 20 and a cutoff ratio of 4. A). name the thermodynamic cycle you would use to analyze this engine, b). p-v and t-s diagram for this cycle, c). determine the heat input to the engine if the temperature rise of the heat addition step is 1300 C, and d). determine the engine speed in revolutions/minute for a net power output of 40 kW is the net cycle work is 3.0 kJ/cycle.

Answer 1

Solution:

Giren: 8=20 18c=4 AtR 1300°C / Whet tokw Wout= 3 kJ cycle Tap # The diesel Gelo For compersion ignition engine, the diesel Gele is used. cycle, [Note :+ for S. I (spark ignition) engine, the otto Cycle is used. (b → In diesel the term cut off ratio is used. PA gin gin TA 3 3 ♡ 4 4 Yout Yout S Figi The Avdagram fig: The . Is dingoom Process : 1-2 → Isentropic compression Process : 2-3 → Constant pressure heat addition Bocells: 3-4 → Isen trobic expansion Process: 4-1 → Constant volume heat rejection

(co °C KlKg. ( [For air, (p= 0.718 # The Constant pressure host additions → Yön = mx(ha-ha) = mxCpx (3-T) » rise in the temperature due to eat mxCp X ATR addition or din = qin Cox AtR 0.718 X 1300 = 1933.4 KJIKA m Code # The net power output: → Whet = Wout (Cycles per second > 40 KJ = 3 KJ Here N is the engine speed in Cycle revolution moute 800 rpm x S N 60 9 = N =