Before revision: + Parameters at −∞ and +∞ and their relationshipParameter PressureDensity Velocity Stagnation enthalpyEnthalpy −∞ PaρaCu (upstream velocity)houhu+∞ PaρaCs (slipstream velocity)hodhdRelationshipEqualEqualUnequalUnequalEqualCommentsPressure will be atmospheric at both −∞ and +∞Density will be equal at both −∞ and +∞Velocity will change due to flow across an assumed converging ductStagnation enthalpy will be different at −∞ and +∞The static Enthalpy will be same at −∞ and +∞ as it depends upon the atmospheric conditions that will be the same In the figure, across the propeller disc, velocities (C1 and C2) cannot change abruptly across the propeller disc as that will create a shockwave but the fan creates the pressure difference across the propeller disc.
After revision: + Parameters at −∞ and +∞ and their relationshipParameter PressureDensity Velocity Stagnation enthalpyStatic Enthalpy −∞ PaρaCu (upstream velocity)houhu+∞ PaρaCs (slipstream velocity)hodhdRelationshipEqualEqualUnequalUnequalEqualCommentsPressure will be atmospheric at both −∞ and +∞Density will be equal at both −∞ and +∞Velocity will change due to flow across an assumed converging ductStagnation enthalpy will be different at −∞ and +∞The static Enthalpy will be same at −∞ and +∞ as it depends upon the atmospheric conditions that will be the same In the figure, across the propeller disc, velocities (C1 and C2) cannot change abruptly across the propeller disc as that will create a shockwave but the fan creates the pressure difference across the propeller disc.