IC Engines Flashcards
1
Q
Compression ratio
A
r = V BDC / V TDC = V swept + V c / V c
2
Q
V swept
A
= πB²S / 4
3
Q
Air standard assumptions
A
Air - ideal and closed loop
Internally reversible
Properties constant (use room temp)
Use heat addition and rejection
4
Q
Cycle efficiency
A
η = W net / Q net = 1 - q out / q in
5
Q
First law of closed systems
A
dQ = dW + dU
In adiabatic means ΔW = U₂ - U₁
6
Q
Pressure to volume relation
A
P₂/P₁ = (V₁/V₂)ᵏ
7
Q
Pressure to Temperature relationship
A
P₂/P₁ = (T₂/T₁)ᵏ/ᵏ⁻¹
8
Q
Otto cycle efficiency
A
η = 1 / rᵏ⁻¹
9
Q
MEP measure of performance
A
P- = W net / V swept
