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

microprocessors, how can you access the general purpose registers of Micro...

how can you access the general purpose registers of Microprocessor in windows XP/2000/98...

Trigonometry( bearings and rectilinear figures), a pilot entering a bay on ...

a pilot entering a bay on course 60.3 degrees at speed 12 miles per hour sees a light bearing 37.3 true and 20 minutes later he sees it bearing 20.0 degrees true. if he keeps the

Uncertainty propagation, Uncertainty propagation In order to calculate ...

Uncertainty propagation In order to calculate the error of a quantity derived from a mathematical formula which has measured variables with errors, one should use the uncertain

Oil pressure warning light in aircraft, Oil pressure warning light: Oil...

Oil pressure warning light: Oil pressure is also monitored by an oil pressure switch that puts a light on when the oil pressure reaches a low level. The light is usually red an

Explain derivatives in terms of capital markets, Explain derivatives in ter...

Explain derivatives in terms of capital markets The term mixture indicates that it has no separate value that is its value is entirely resulting from the of the actual resources

Modified accelerated cost recovery system , Modified Accelerated Cost Recov...

Modified Accelerated Cost Recovery System (MACRS) Although SLN is the most commonly used depreciation method in the U.S. for purpose of financial reporting, MACRS is the only

Numerical methods, Numerical solutions to equations: Many practical p...

Numerical solutions to equations: Many practical problems in engineering involve complex boundary conditions and variable properties that cannot be solved analytically, creat

Engine PW4168 or PW4168A, How is the overspeed solenoid cutback valve opera...

How is the overspeed solenoid cutback valve operate when Engine overspeed happen?

Vehicle handling and control, Your objective in this lab is to convince the...

Your objective in this lab is to convince the assessor that you understand the basic concepts of how shock absorbers affect the ride and handling of a vehicle.  This will involve d

Aeroengine - axial flow compressor , An axial-flow air compressor consists ...

An axial-flow air compressor consists of 10 rotor/stator stages each built from p gblades of identical cross-section and designed such that the axial velocity is constant throughou

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