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-   -   how to do blade passage analysis of turbine? (http://www.cfd-online.com/Forums/fluent/39291-how-do-blade-passage-analysis-turbine.html)

kaen January 17, 2006 23:49

how to do blade passage analysis of turbine?
 
Hi i am doing flow analysis of single blade passage .I am using folowing strategies but nothing works.pls help me in this regard.Total Pressure at inlet is 2.83 bar,Total temp =923 K inlet flow velocity=125 m/sec.Out totoal pr=1.12 bar.,total temp=760 K,Velocity=125 m/sec.rotational speed of passge=60,000 rpm (6280 rad/sec).mas flow =0.596 kg/sec.What i am doing is first giving less rotational speed and when it converges increases speed in next run by taking initial file of prevouis. (1)when i am giving inlet pressure and outlet poressure wit h steady condition and speed as 100 rad/sec.the flo w is cinserved.but real mass flow at inlet and outlet is not achived. it is in terms of thousands insread actual valkue 0.596 kg/sec. (2) when i am giving unsteady solutuion directly without doing steady solution then it says divergence detected in AMG solver.I am reducing underrelaxation parametrs but notjing works.temeprature limit also crosses 5000. so pls tell me which boundary conditon shouls be applied.also shoud i first do steady analysis and then transient analysis.or directly unsteady analysis. thanking u all.



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