Which of the following thermodynamic processes comprise the ideal air-standard Dual Combustion (Sabathé) cycle?
Options:
(A) Isentropic (reversible adiabatic) compression
(B) Constant volume heat addition followed by constant pressure heat addition
(C) Isentropic (reversible adiabatic) expansion
(D) Constant pressure heat rejection
Answer Key:
A, B, C
Step-by-Step Solution & Explanation
The five thermodynamic processes of the Dual Combustion cycle are:
1. Process 1-2: Reversible adiabatic (isentropic) compression.
2. Process 2-3: Reversible constant volume heat addition (explosion phase).
3. Process 3-4: Reversible constant pressure heat addition (combustion phase).
4. Process 4-5: Reversible adiabatic (isentropic) expansion.
5. Process 5-1: Reversible CONSTANT VOLUME heat rejection (blow-down to BDC).
- Statement D is incorrect because heat rejection is at constant volume, not constant pressure.