For air, γ = 1.4, so (0.4/1.4) = 0.286.
At steady state, Power_turbine × η_mech = Power_compressor turbo physics grade 12 pdf
To reduce lag, Kael lightened the turbine wheel (lower I) and designed a smaller A/R (area/radius) turbine housing—which increased exhaust velocity but reduced top-end flow. At full throttle, boost climbed past 2.2 atm. The engine detonated. Dr. Vane pointed to a small actuator: the wastegate. It diverted exhaust around the turbine when boost exceeded a setpoint. For air, γ = 1
Power_compressor = ṁ_air × cp_air × (T_out – T_in) / η_mech γ = 1.4
New density at 1.7 atm, 45°C (318 K): ρ = (1.7×101325)/(287×318) ≈ 172252/91266 ≈ 1.89 kg/m³