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

Architecture.., draw folded plate roof structure on multi purpose hall?

draw folded plate roof structure on multi purpose hall?

What is ebidta?, What Is EBIDTA?  EBITDA appears for income before atten...

What Is EBIDTA?  EBITDA appears for income before attention, taxation, devaluation, and amount. EBITDA came into large use among personal investment companies, seeking to determ

Steamtables, How to draw diagrams for Rankine cycle

How to draw diagrams for Rankine cycle

Water traetment, what are the different phosphates used in water treatment?...

what are the different phosphates used in water treatment?

Aieee, aieee ka course karne ke liye kya karna padega

aieee ka course karne ke liye kya karna padega

Probabilistic analysis - fire risk assessment , Probabilistic analysis - Fi...

Probabilistic analysis - Fire risk assessment: Probabilistic analysis relies on data and data comes from experience.  The broader the experience, the larger the data source an

Circuit Problem, Please solve this problem fully http://i39.tinypic.com/6...

Please solve this problem fully http://i39.tinypic.com/64h3kl.png

Noise reduction in aircraft design, Noise reduction The problem of engi...

Noise reduction The problem of engine noise has always been associated with aircraft. Increases in engine power have given rise to increases in noise and the indications are t

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