Duct with flow control-aircraft maintenance, Other Engineering

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

Posted Date: 9/11/2012 7:11:01 AM | Location : United States







Related Discussions:- Duct with flow control-aircraft maintenance, Assignment Help, Ask Question on Duct with flow control-aircraft maintenance, Get Answer, Expert's Help, Duct with flow control-aircraft maintenance Discussions

Write discussion on Duct with flow control-aircraft maintenance
Your posts are moderated
Related Questions
Question: (a) What are the elements limiting high data rate in cellular networks? (b) Describe the following characteristics of 4G mobile networks: - Always on - RAN A

Primed stability derivatives The rolling and yawing motions are coupled through the cross inertia I XZ due to rotation not being about the principal axes. Since in general air

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

The axial flow compressor: The axial flow compressor is by far the most popular type of compressor and, although it is more difficult to manufacture, it is a more efficient com

Thrust augmentation: There are occasions when the maximum thrust from a basic gas turbine engine is inadequate and some method of increasing the available thrust is required wi

Fractional distillation This process is carried out in a fractionating column, which has a series of trays as shown in the figure. The effect of the superheated steam on the h

The operation of heating a green compact to an elevated temperature is known as sintering. It is a process by which solid bodies are bonded by atomic forces. It is carried out belo

Q. What are the commented carbides? How are they processed? Ans. These are very important products of powder metallurgy and finds wide applications as cutting tools, wir

Generally, there are three modes to describe different crack surface displacement in a cracked body. Mode I is opening or tensile mode where the crack surfaces move directly ap

main difference between warping and without warping