ME17 · Sem 5 · IC engines

Dual combustion cycle

Aim: Model the dual cycle used for modern high-speed diesels.

🧪 Live simulation🧊 Real-time 3D bench⚠ Simulated values, not physical measurements

🔬 Virtual lab

Starting the lab…

📘 Theory

Part of the heat is added at constant volume and part at constant pressure. The dual cycle lies between Otto and diesel and represents real engines better.

q_in = cv(T3 − T2) + cp(T4 − T3)

🧰 Apparatus (virtual)

Engine model
P–V indicator

📝 Procedure

Run with the default ratios
Change the pressure ratio α
Change the cut-off rc
Compare with ME15 and ME16

Observations and result (kept on this device)

🎤 Viva questions

Why is the dual cycle more realistic

Combustion in fast diesels starts rapidly then continues as fuel is injected.

What happens when rc = 1

It becomes the Otto cycle.

🛡️ Safety

Virtual by default. Machine shops, CNC, presses and test rigs need instructor supervision, PPE and machine-specific safety training.