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Quantifying the swirl in CFX, Swirl Number/Swirl Angle

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Old   May 1, 2012, 01:06
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Glenn Horrocks
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Have a look in my PhD thesis - http://hdl.handle.net/2100/248

See page 74, in the literature review.
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Old   May 2, 2012, 22:35
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Originally Posted by ghorrocks View Post
Have a look in my PhD thesis - http://hdl.handle.net/2100/248

See page 74, in the literature review.
Thanks. The formula is for combustion within the cylinder of an IC engine, and includes "omega" - the crankshaft velocity. Would this relate to a gas turbine engine combustor, where there is no rotating component? The swirl could be introduced in the gas by means of swirl vanes around the inlet nozzle of the gas?
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Old   May 2, 2012, 23:48
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I mentioned this because I wanted to make the point that there is no universal definition of swirl number. It is defined based on what makes sense in the application.

In IC engines it makes a lot of sense to normalise against crankshaft velocity as it is the scaling factor on all engine flows. But for a GT this may not be the case, so an equivalent swirl number normalised by shaft speed may be meaningless.
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