When a converging-diverging nozzle is operated at off-design conditions, a normal shock forms in the diverging portion. The nozzle can be assumed to be perfectly insulate from the surroundings. Then across the shock

When a converging-diverging nozzle is operated at off-design conditions, a normal shock forms in the diverging portion. The nozzle can be assumed to be perfectly insulate from the surroundings. Then across the shock Correct Answer Velocity, pressure and entropy all undergo a jump

Explanation:

Shock waves:

• It has been found experimentally that, under some circumstances, it is possible for an almost spontaneous change to occur in a flow, with the velocity decreasing and pressure increasing through this region of sharp change.
• Such regions of sharp change can only occur if the initial flow is supersonic.
• The extremely thin region in which the transition from the initial supersonic waves, relatively low-pressure state to the state that involves low velocity, subsonic and high pressure is known as shock waves.
• A shock wave that is straight and at a right angle to the flow direction is known as Normal shock wave.

Across normal shock fluid properties change as follows:

• Velocity of flow decreases
• Pressure increases
• specific volume decreases
• Temperature increases
• Entropy increases
• Stagnation pressure decreases
• Density increases