Duct with flow control-aircraft maintenance, Other Engineering

Assignment Help:

Duct With Flow Control-Aircraft maintenance:

BERNOULLI'S THEOREM

This theorem can be related to the relationship between pressure and velocity existing in the air flowing through a duct, such as a jet engine. The theorem states that the total energy per unit mass is constant for a fluid moving inside a duct and that total energy consists mainly of pressure energy and kinetic energy:
• Pressure energy.
In gas or fluid flow the pressure energy is more often called ‘static pressure' and it can be defined as the pressure that would be felt by a body which was submerged in the medium (gas or fluid) and moving at the same velocity as the medium.

• Kinetic energy.
This kind of energy is more often called ‘dynamic pressure' and this term is used to define the extra pressure created by the movement of the medium. Dynamic pressure is proportional to ½ mass x velocity 2 (ie. ½mv2).
When the medium (gas or fluid) is moving, the total energy = static pressure + dynamic pressure.
Consider a duct which is filled with an incompressible fluid and pressurised from one end by an external force. The other end of the duct is sealed by a valve, which can be opened or closed, and a pressure gauge is fitted into the wall of the duct to indicate the static pressure (PS). With the valve closed, static pressure and total energy are the same. However, when the valve is opened to allow a fluid flow, the circumstances changes and, although the total energy must remain the same, it now consists of static pressure + dynamic pressure. As the velocity V increases, so dynamic pressure increases and the static pressure is reduced.

 

25_flow control.png


Related Discussions:- Duct with flow control-aircraft maintenance

Lock Clip Came out from Rear Brake Drum (Backplate) , A type of brake used ...

A type of brake used to keep the vehicle from rolling when it is parked. The standard Parking brake locks the rear wheels to keep the car from moving. Parking brake cable is fixed

Laptop, How laptop making main function plz established??

How laptop making main function plz established??

Manual override relays, Manual override relays: When the manual-overrid...

Manual override relays: When the manual-override relays are not energised, this current flows through brushes riding on slip rings mounted on the propeller spinner bulkhead and

Binary cycle, Consider the binary cycle using the sodium and steam/water in...

Consider the binary cycle using the sodium and steam/water in the sketch below and operating at conditions in Table 1. Draw T S Diagram and find the thermal cycle efficiency

Semiconductor basics summary, N-type (for example add Antimony) The are...

N-type (for example add Antimony) The are materials which have Pentavalent impurity atoms (Donors) added and conduct by the "electron" movement and are called as N-type Semi

Iosipescu shear test, A second way to determine the shear modulus is to use...

A second way to determine the shear modulus is to use the Isopescu shear test. The sample is placed in a jig and loaded as shown. Under load, a region of pure shear exists

Cash flows, Your company is considering a machine that will cost $6,287 at ...

Your company is considering a machine that will cost $6,287 at Time 0 and which can be sold after 3 years for $790. To operate the machine, $886 must be invested at Time 0 in inven

Evacuation of a high rise building - means of escape, Evacuation of a high ...

Evacuation of a high rise building - means of escape: Evacuation of a high rise building is likely to be split into two or more phases.  Initially, when the alarm activates (f

Secondary operations in powder metallurgy methods, Q. What are the secondar...

Q. What are the secondary operations we apply in powder metallurgy methods. Give their use also. Ans. Secondary Processes of Manufacture : In addition to the basic proce

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