Engine Cycles Flashcards
1
Q
What are the four processes in the Otto cycle?
A
1-2: Isentropic compression.
2-3: Constant volume heat addition (combustion).
3-4: Isentropic expansion.
4-1: Constant volume heat rejection.
2
Q
What is the key difference in heat addition between Otto and Diesel cycles?
A
Otto: Heat added at constant volume.
Diesel: Heat added at constant pressure.
3
Q
What is the dual cycle?
A
Combines constant volume and constant pressure heat addition.
More realistic for actual engines than Otto or Diesel cycles.
4
Q
What is the compression ratio (rv)?
A
= V1/V2
Volume before compression (V1)
Volume after compression (V2)
5
Q
What is the load ratio (α) in the Diesel cycle?
A
= V3/V2
Volume after heat addition (V3)
Volume after compression (V2)
