||January 17, 2006 23:50
how to do this turbine blade passage flow nanlysis
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 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.