Re: how to do this turbine blade passage flow nanl

manish

hi to all .I want to siumulate 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 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.