Blade twist - aircraft engine, Other Engineering

Assignment Help:

BLADE TWIST:

Rotational velocity and its effect on the Angle of Attack depends on the radius of the blade element in question. A blade element near the blade root (hub) will have a much lower rotational velocity than a blade element near the blade tip. Rotational velocity is usually expressed as NR where R is the position of the element from hub centre and N is the propeller R.P.M.

It will be seen that in order to maintain an efficient angle of attack along the length of the blade, a reducing blade angle is necessary from root to tip. This progressive change in blade angle is called blade twist. It is best understood by considering the requirement for each section of the blade to produce an equal amount of thrust and to advance the same distance in one revolution. Ensuring that the angle of attack remains constant along the total length of the blade is a major factor in achieving this.

For a single revolution of the propeller, the amount of air handled depends on the bit of air a propeller takes. Therefore the blade angle is a means of adjusting the load on the propeller to control the engine R.P.M.

1560_blade twist.png


Related Discussions:- Blade twist - aircraft engine

Aircraft engine, what is the basic operation of gas turbine engine?

what is the basic operation of gas turbine engine?

Thermodynamics, show that heat and work are path functons

show that heat and work are path functons

Plastic processing methods , Q. Write short note on following :    ...

Q. Write short note on following :             (i) Compression moulding of plastics.             (ii) Injection moulding of plastics.

syed, risks involved in moving from a project-centric mode to a mix of pro...

risks involved in moving from a project-centric mode to a mix of projects and

Electromagnetic spectrum , Electromagnetic Spectrum: Visible light belo...

Electromagnetic Spectrum: Visible light belongs to a family of waves known as the electromagnetic spectrum. Other members of this family include high frequency short wavelength

Falling weight impact testing , Drop-weight impact towers are frequently us...

Drop-weight impact towers are frequently used to generate low velocity impact damage. Typically, the falling mass will be instrumented, containing a load-cell for measuring the lo

Electrochemistry, can two metals such as iron and nickel be separated compl...

can two metals such as iron and nickel be separated completely by electrogravimetry?

Compressibility fluid -aircraft maintenance, Compressibility Fluid: Com...

Compressibility Fluid: Compressible fluid flow refers to the air flow through a gas turbine engine and, because the air is compressible, flow at subsonic speeds causes a change

Gutter fill, calculations about gutter fill?

calculations about gutter fill?

Strength of materials, a rectangular beam of size 40mm*60mm is subjected to...

a rectangular beam of size 40mm*60mm is subjected to bending. the maximum bending stress is limited to 75N/mm^2. find the moment of resistance of beam section.

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