Airflow control system principles-aircraft engine, Other Engineering

Assignment Help:

Airflow control system principles:

For any given engine there is only one set of conditions, mass flow, pressure ratio and rpm, at which all the compressor components are operating at their optimum effect. Compressors are designed to be most efficient in the higher rpm range of operation. The point at which the compressor reaches its maximum efficiency is known as the DESIGN POINT. Under design conditions the compressor produces a given compression ratio (ie.Volume 2/Volume 1) and the axial velocity (average velocity) of the gas remains approximately constant from the front to the rear of the compressor.

The Angle of Attack of the airflow to the compressor aerofoil blades will be at its optimum. This is the design condition and the compressor is operating at its optimum performance. Although compression ratio varies with rpm it is not proportional to rpm. This fact emerges due to the fixed blade angles, which can only be correct at the design point. To illustrate this fact, refer to the diagram showing rpm and compression ratio. Consider a compressor running at 8,000 rpm and its compression ratio is 10:1. Let us say that the volume of air entering the compressor is 100cm3. The volume of the air passing through the fixed outlet annulus of the compressor will be 10cm3.

710_airflow control system principles.png

Compressor R.P.M = 8,000 Compressor R.P.M. = 4,000
Compression Ratio = 10:1 Compression Ration = 4:1
Volume of gas (V1) = 100cm3 Volume of gas (V1) = 50cm3
Volume of gas (V2) = 10cm3 Volume of gas (V2) = 12.5cm3


Related Discussions:- Airflow control system principles-aircraft engine

Demand schedual, How do I create a demand schedual for 1 year?

How do I create a demand schedual for 1 year?

Abradable linings-aircraft engine, Abradable Linings: Abradable Linings...

Abradable Linings: Abradable Linings are usually made of a composite material which will be abraded away should the tip of a rotating blade touch the material. In flight the ca

Grain ethanol plant design, Can you help me design a grain ethanol plant as...

Can you help me design a grain ethanol plant as a design project? I need help with mass and energy balances Key equipment design ie distillation column, heat exchanger, storage t

Skin-core debonding in sandwich structures, If the skins are peeled from th...

If the skins are peeled from the core, a sandwich structure loses its strength and stiffness. This can occur under - wave-slamming in fast ferries - rapid depressurisati

Guidance control system, Guidance Control system The control aspect...

Guidance Control system The control aspect of the guidance system is intended to stabilise the behaviour of the airframe.  The fact that the guidance system will always h

Where do you think by djia?, Where do you think by DJIA? Nobody knows th...

Where do you think by DJIA? Nobody knows the respond to this one. However, you should at least have some ideas on the topic and be able to communicate why you think this is the

Mode iii interlaminar fracture toughness , Mode III Interlaminar Fracture T...

Mode III Interlaminar Fracture Toughness  The Mode III interlaminar fracture toughness of a composite can be measured using the split cantilever beam (SCB) geometry. Here, a c

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