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how to do this blade passage flow analysis ?

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Old   January 13, 2006, 21:52
Default how to do this blade passage flow analysis ?
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hi to all .I want t osiumulate flow through bladepassage of a radial inflow gas turbine.It has presure drop of 2.8,so i have not to use stator.I have 12 no of blades.I am taking only one.It has w=1680 rad/sec (60,000 rpm).Inlet pressure is 2.83 bar (Total pr) outlet is 1.12 bar.Inlet total temp is 923 K and outlet temp is 760 K.mass flow rate is 0.596 kg/sec.Flow velocity at inlet 125 m/sec.I have given different boudary conditions but at each time it is giving very erronous results.i.e .pressure goes upto 9 bar.

(1) when i a m giving mass flow arte at inlet and pressuire at outlet then it is giving erromous resuts.mass flow is conserved but pressure values are far from actualk valus. (2) AT INLET Pressure and oulet pressure .Here pressure valuse have less difrence wit hactual values but mass flow is not mathich. can anybody guide me in this matters.whic hboundary condition i should give.and which initial valus i should give? . second thing is that can i go directly by giving unsteady anal;ysis .or first i have to solve this problem using steady satte and then go throgu hunsteady state. Thnks all.


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Old   January 13, 2006, 22:53
Default Re: how to do this blade passage flow analysis ?
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I've seen people using total pressure at inlet & static pressure at outlet for problem similar to this. Have you tried this out? Have you done mesh dependency test? I assume this is highly turbulence flow. What turbulence model have you used? Try resolving this issue first before you go for transient simulation.
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Old   January 16, 2006, 03:58
Default Re: how to do this blade passage flow analysis ?
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i am using ke model.what is meant by mes dependency test?
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