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

Fire precautions - fire protection engineering, Fire precautions - fire pro...

Fire precautions - fire protection engineering: Fire precautions include: Protecting escape routes in fire resisting construction, Providing fire doors between

Engine cycles, ENGINE CYCLES The two commonly used cycles on which th...

ENGINE CYCLES The two commonly used cycles on which the I.C. engines operate are: 1Otto cycle.         2 Diesel cycle. 1 OTTO CYCLE: theoretical Otto cycle is shown i

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.

What is the meaning of context-awareness, Question : (a) The Guide proj...

Question : (a) The Guide project has been developed to provide city visitors with a hand-held context-aware tourist guide. (i) In this case, what is the meaning of context-a

Plumbing, what are the most short forms given to materials in plumbing

what are the most short forms given to materials in plumbing

Product applications of powder metallurgy, Q. Describe two major product ap...

Q. Describe two major product applications of powder metallurgy. Ans. Following are some typical applications of powder metallurgy.         (i) Refractory metal : P

Fire alarm systems - look for when inspecting, Fire alarm systems: Fir...

Fire alarm systems: Fire alarm systems can be very complex and it is usually not possible for an enforcing officer to check all the cabling, the components, the software and t

Function, what is function independence.on software engineering

what is function independence.on software engineering

Define the term technology, Question 1 Define the term technology. Write a...

Question 1 Define the term technology. Write a effective short note on evolution and growth of technology Question 2 Citing an example, state and explain the reasons that com

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