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احتاج الى معرفة الفرق بين غرف الاحتراق نوع annular and can type وفائدة ومضار كل منهما
مع جزيل الشكر
 

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إنضم
23 مايو 2010
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احتاج الى معرفة الفرق بين غرف الاحتراق نوع annular and can type وفائدة ومضار كل منهما
مع جزيل الشكر

Combustor design is a complex task, often referred to as a “black
art.” The combustor design took two distinct configurations fairly
early in the evolution of the gas turbine. These are the can-annular
combustor and the annular (including the single combustor) combustor
sections. There are generally two types of can-annular combustors:
one is the more efficient straight flow-through; the other is the reverse
flow combustor (Figure 3-12). The advantage of the reverse flow combustor,
as used in the heavy industrial gas turbine, is that this design
facilitates the use of a regenerator, which improves overall thermal efficiency.
A further distinctive design approach within the can-annular
concept is a single fuel nozzle and multi-fuel nozzles per combustion
chamber. In theory, a large number of fuel nozzles provide better dis
-tribution of the fuel gas (or greater atomization of the liquid fuel particles)
and more rapid and uniform burning and heat release (Figure
3-13). But the problems of equally distributing fuel to each fuel nozzle
significantly limit the number of fuel nozzles employed.

The second combustor concept is the annular or single combustor.
The single combustor is a stand-alone combustor, generally outside
the envelope of the compressor and turbine. The annular combustor
is also a single combustor but within the envelope of the compressor
and turbine (Figure 3-14). Two main distinctions exist between these
designs. The single combustor is usually configured with a single fuel
nozzle, while the annular combustor must be configured with multiple
fuel nozzles. Secondly, the annular combustor incorporates an
inner wall or liner and heat shield, which is necessary to protect the
rotor. The heavy industrials use a longer combustion chamber, which
makes it more suitable for burning poor quality fuel. However, the
longer combustor also sacrifices combustor efficiency due to reverse
flow pressure losses, a greater surface area to be cooled, and greater
heat loss through convection and radiation.

نقلا من gas turbine handbook.
 
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