Centrifugal flow - compressors in aircraft, Other Engineering

Assignment Help:

Centrifugal flow - Compressors in Aircraft:

The centrifugal impeller is rotated at high speed by the turbine and centrifugal action causes the air between the impeller vanes to accelerate radially outwards until it is thrown off at the tip into the diffuser. The radial movement of the air across the impeller, from eye to tip, causes a drop in air pressure at the eye and the faster the impeller is turning, the lower the pressure at the eye becomes. The low pressure existing at the eye of the revolving impeller induces a continuous flow of air through the engine intake and into the eye of the impeller. The air, in turn, is accelerated across the impeller and passed into the diffuser. The kinetic energy in the air is then converted to pressure energy ready to enter the combustion chamber. The action of the diffuser is illustrated in figure.

2263_Compressors1.png


The final volume and mass airflow delivered by the centrifugal compressor is dependent on:

a Pressure ratio
b Operating RPM
c Diameter of the impeller

NOTE: This is assuming a constant air density at the inlet of the compressor.

Pressure Ratio

The ratio of the inlet pressure to outlet pressure of the compressor is called pressure ratio. The higher the pressure of the air the more efficiently the thrust will be produced with a corresponding improvement to the fuel economy of the engine.
The maximum pressure ratio normally obtainable from a single stage centrifugal compressor is approximately 5:1 and from a two stage, approximately 8:1.Design of the more modern centrifugal compressors sees them approaching pressure ratios of 15:1.

Diameter of Impeller

A large impeller will deliver a greater mass of air than a small impeller, however a large diameter compressor leads to an increase in the frontal area of the engine causing excess drag forces on the aircraft.

332_Compressors2.png


Related Discussions:- Centrifugal flow - compressors in aircraft

Financial engeneering, “A swap bank has to entail certain risks which are i...

“A swap bank has to entail certain risks which are inherent to the swap business and are interrelated” Explain the risks involves in swap business.

Riser design, A riser or a feeder head is a passage of sand made in the cop...

A riser or a feeder head is a passage of sand made in the cope to permit the molten metal to rise above the highest point in the casting after the mould cavity is filled up. Risers

LTE, WHATIS LTE CODING TECHNIQUES USE FOR MOBILE SYSTEM

WHATIS LTE CODING TECHNIQUES USE FOR MOBILE SYSTEM

Aerodynamics-flow model diagram , We will need to use several different flo...

We will need to use several different flow models as we go along. It is crucial to understand the simplifications used to obtain these models because these limit the validity of th

Load flow studies from power generation and distribu, The load data given i...

The load data given in Table 1 belongs to a power company. Develop the daily load curve for the primary feeder. Also, determine: a. maximum coincident demand of the system b. deman

Heat and mass transfer, Water enters a smooth thin-walled tube of 1 inch di...

Water enters a smooth thin-walled tube of 1 inch diameter at 50F and leaves at 150F. Heat is supplied to the water by condensing steam on the surface of the tube at a constant temp

Mr Rhino, Which range will you select when measuring for 240ohms resistor?

Which range will you select when measuring for 240ohms resistor?

Thermodynamics, Air at 1bar and 30 degreeC is to be compressed to 1.2 bar a...

Air at 1bar and 30 degreeC is to be compressed to 1.2 bar at the rate of 50m3/min. find the power required by a roofs blower.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd