Due to efficiency considerations related to its bow wake, the supersonic transpo

Question

Due to efficiency considerations related to its bow wake, the supersonic transport aircraft must maintain a cruising speed that is a constant ratio to the speed of sound (a constant Mach number). If the aircraft flies from warm air into colder air, should it increase or decrease its speed? Explain your answer. Due to efficiency considerations related to its bow wake, the supersonic transport aircraft must maintain a cruising speed that is a constant ratio to the speed of sound (a constant Mach number). If the aircraft flies from warm air into colder air, should it increase or decrease its speed? Explain your answer. Due to efficiency considerations related to its bow wake, the supersonic transport aircraft must maintain a cruising speed that is a constant ratio to the speed of sound (a constant Mach number). If the aircraft flies from warm air into colder air, should it increase or decrease its speed? Explain your answer.

Explanation / Answer

When the aircraft flies from warm air into colder air its speed is decreases.

Since mach number is constant i.e., Mach number M = u / v

Where u = Local flow velocity with respect to the boundaries

           v = the speed of sound in the medium

If the aircraft flies from warm air into colder air the speed of the sound in medium is decreases.But the Mach number is remains constant.So, correspondingly the local flow velocity with respect to the boundaries is also decreases.

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