Question

A dual combustion cycle operates with a volumetric compression ratio r_k = 12, and with a cut-off ratio 1.615. The maximum pressure is given by p_max = 54 p₁' where p₁ is the pressure before compression. Assuming indices of compression and expansion of 1.35, show that the m.e.p. of the cycle

p_m =10 p₁

Hence evaluate (a) temperatures at cardinal points with T₁ = 335 K, and (b Cycle efficiency.

Answer 1

Here

∴ T₅ = 3.6019 T₁

∴ W = [C_v (T₃ – T₂) + C_P (T₄ – T₃) – C_v (T₅ – T₁) = 2.4308 T₁ kJ/kg.

p_m =  (v₁ – v₂) = W