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This type of compressor moves air by the use of rotating airfoils countered against static (nonmoving) airfoils. All airfoils are designed to move air "downward", or rearward in a jet engine. Since the purpose of a compressor is to compress, conditions can sometimes develop where the airfoils try to compress more than their design. Air begins to try to flow backwards to relieve the excess pressure. This backpressure is the same as an airplane wing increasing it's angle of attack (say by flying too slowly). The airfoil can't move enough air to maintain the pressure and the result is a stalled airfoil.
Modern jet engines will bleed air out the middle or back of such a compressor to prevent such stalls. Early jet engines had no such protections. A stalled compressor is actually easier to turn. This relieves the load on the turbine powering the whole thing and the engine overspeeds. The pilot sees a surge in the engine. If it overspeeds enough, catastrophic damage may occur to the turbine (it explodes). The compressor bleed lines help prevent such failure.
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The frontal area of a centrifugal compressor as compared to axial flow compressor is larger or smaller?
the frontal area of a centrifugal compresor is more as compared to axial flow compressor for a given air flow. And for this reason axial compressors are being used in aircraft engines.
Is axial flow gas turbine compressor is self propelled or some external power is provided?
no, it`s not , it also require some external power.
Designing an axial fan for aircraft?
what do you mean? axial compressor (or) axial turbine? Their missions are different. Design for axial compressor or turbine, must be consider their performance. The performance is characterized by - pressure ratio, rotational speed and efficiency. The details of how to design axial fan, are very complex.
What is the disadvantages of centrifugal compressor?
A centrifugal pump cannot pump air, therefore cannot self prime, like a positive displacement pump.
How does axial pump works?
An axial flow pump operates centrifugally in design. The fluid is pushed outward from the center or axis of the pump.
The frontal area of a centrifugal compressor as compared to axial flow compressor is larger or smaller?
the frontal area of a centrifugal compresor is more as compared to axial flow compressor for a given air flow. And for this reason axial compressors are being used in aircraft engines.
What is the difference of an axial flow and centrifugal compressor?
The centrifugal flow compressor has a single or two stage unit using an impeller. The axial flow compressor is a multi-stage unit using alternate rows of rotating (rotor) blades and stationary (stator) vanes.
What is the cause of stall and surge in compressor?
stall and surge is caused when the flow in the compressor loses enthalpy and static energy so that it does not have enough power to approach the end of the axis; thus it remains in the annolus of the compressor and creates a stall cell. these cells gradually join each other and create stall zones which are rotating about the axis and are some times called rotating stall. if this stage does not get stopped, the stall cells will cover the whole annolus and will stop the fluid flow through the stages of the compressor and finally lead to surge. if surge happens, the compressor will be out of order.
Which is true when a radial compressor and an axial compressor with equal air flow and revolution are compared?
I don't understand the question. It would appear that you wish to compare a centrifugal compressor and an axial flow compressor operating at the same speed and delivering equal flow rates. What is the process fluid? What is the question? Is the "equal air flow" the mass flow rate? At what pressure differential would you like to consider these machines? What is it that you wish to compare? Is it weight, frontal area, mechanical efficiency, overall diameter, length, delivery temperature, input power or what?
What has the author N Suryavamshi written?
N. Suryavamshi has written: 'Unsteady flow field in a multistage axial flow compressor' -- subject- s -: Centrifugal compressors, Unsteady flow, Flow distribution
What is the different between axial turbocharger and radial turbocharger?
An axial compressor uses many stages of "fans" with stators to compress air in the same direction as its original flow. An example of this is that of *most* turbojet engines' compressors. A radial (or centrifugal) compressor works at right angles to the airflow's original direction. An example of a radial compressor is the compressor on an automotive turbocharger.
What has the author Charles H Kruger written?
Charles H. Kruger has written: 'The axial-flow compressor in the free-molecule range'
Why is the axial flow compressor better than the centrifugal compressor?
Higher peak volumetric efficiency. You don't have to turn the air at all, so you do not lose and energy in transforming it as you compress the air.
What has the author Franklin K Moore written?
Franklin K. Moore has written: 'Research on rotating stall in axial flow compressors. Part IV. A preliminary study of three-dimensional rotating stall'
Is axial flow gas turbine compressor is self propelled or some external power is provided?
no, it`s not , it also require some external power.
Which type of rotary compressor used in gas turbine?
Rotating axial compressor.
Designing an axial fan for aircraft?
what do you mean? axial compressor (or) axial turbine? Their missions are different. Design for axial compressor or turbine, must be consider their performance. The performance is characterized by - pressure ratio, rotational speed and efficiency. The details of how to design axial fan, are very complex.
