# Why does the height of the axial flow compressor blade decreases along the flow whereas the height of the axial-flow turbine blades increases?

## Why does the height of the axial flow compressor blade decreases along the flow whereas the height of the axial-flow turbine blades increases?

The height of the blades is seen to decrease as the fluid moves through the compressor. To keep the same mass flow rate for each stage, the blade height is decreased along the axis of the compressor.

## What is the difference between high pressure and low pressure turbine?

The high pressure turbine is designed to efficiently extract work out of the high pressure steam as it initially enters the main propulsion turbines. The low pressure turbine is designed to efficiently extract work out of steam which is exhausting out of the high pressure turbine at a lower pressure.

Where is the low pressure in the turbine engine?

The front compressor, or low-pressure compressor, is in front of the high-pressure compressor. The turbine that drives the low-pressure compressor is behind the turbine that drives the high-pressure compressor.

How does a low pressure turbine work?

In the low-pressure turbine the steam continuously expands from point E to F. The exhausted steam then condenses in the condenser and it is at a pressure well below atmospheric (absolute pressure of 0.008 MPa). The steam is in a partially condensed state (point F), typically of a quality near 90%.

### What happens to the relative velocity of air after passing through the rotor blades?

After passing through the diverging passages formed between the rotor blades which do work on the air and increase its absolute velocity, the air will emerge with the relative velocity of at angle which is less than .

### Why does the velocity of a gas impeller decrease?

In order to increase the static pressure of the gas flow owing to the fan, the velocity relative to the blades should decrease according to Eq. (9.103). The flow velocity diagrams on both sides of the impeller are shown in Fig. 9.44.

Which is the positive pressure side of the propeller?

That side of the blade facing away from the boat, known as the positive pressure side of the blade. The side of the blade facing the boat, known as the negative pressure (or suction) side of the blade. The point at which the blade attaches to the hub.

How does the exit velocity of a fan Affect Static pressure?

Eq. (9.79) shows that the rise in circumference velocities at the entrance and exit leads to the static pressure 1 / 2ρ(u22 − u21) increase but not in the axial fan. This results in the axial fan’s not having the same pressure rise as that of the centrifugal fan.