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

Ratio analysis, calculate inventory turnover ratio, when only given current...

calculate inventory turnover ratio, when only given current assets $100,000, current liabilities, $25,000 sales $200,000 and quick ratio=1.5

Compression properties of composites , The IITRI test is widely used to mea...

The IITRI test is widely used to measure the compressive properties of composites. The specimen is rectangular with aluminium end tabs bonded to protect against the gripping actio

Hot and cold working, the amount of cold working metal can withstand is dir...

the amount of cold working metal can withstand is directly related to which properties? name two and also discuss the effect that cold working has upon these properties?

Case study, I need to get this case study done. Here is a link to the case...

I need to get this case study done. Here is a link to the case: Disregard">http://ss-edu.info/df/cases/Case%2094.pdf Disregard question 10.

Electronic engine control systems - aircraft engine, Electronic engine cont...

Electronic engine control systems : Advances in gas turbine technology have demanded more precise control of engine parameters than can be provided by hydromechanical fuel cont

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

what are the different phosphates used in water treatment?

Enthalpy, What is the deference between enthalpy anne internal energy u

What is the deference between enthalpy anne internal energy u

Pneumatics, 3. Design and draw a circuit using the cascade system to operat...

3. Design and draw a circuit using the cascade system to operate two cylinders (A and B) which, on the operation of a start valve, produces the sequence A – B + B – A+. The cylinde

Measurements of economic worth, Measurements of Economic Worth There a...

Measurements of Economic Worth There are several methods of economic worth used to compare alternatives. If you decide to use present worth analysis, then you have indicate a

Deformation of metals, Q. Explain the following with reference to deformati...

Q. Explain the following with reference to deformation of metals:                         (1) Preferred orientation                         (2) Elastic after effect

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