# CFD Analysis of Casing and Impeller

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 January 18, 2002, 05:05 CFD Analysis of Casing and Impeller #1 Pankaj N Bid Guest   Posts: n/a Dear Sir I am facing problem when i am analysing the casing with complete impeller passage the results we are getting is within the range. But the same problem when analysed using the same casing with single blade passage the results are not matching. Can anybody please tell why this difference is there and suggest some solution. Regards Pankaj Bid

 January 19, 2002, 02:53 Re: CFD Analysis of Casing and Impeller #2 henry Guest   Posts: n/a hi Is the casing a volute type casing? henry

 January 19, 2002, 11:01 Re: CFD Analysis of Casing and Impeller #3 yan chuan Guest   Posts: n/a hi! i am also doing a similar project, but mine's got outlet guide vanes. did you check the flowrate? but the way, did you use turbogrid to generate your grid.

 January 21, 2002, 01:48 Re: CFD Analysis of Casing and Impeller #4 Pankaj N Bid Guest   Posts: n/a Hi Henry The Casing is volute type Regards Pankaj N Bid

 January 21, 2002, 01:58 Re: CFD Analysis of Casing and Impeller #5 Pankaj N Bid Guest   Posts: n/a Yes I have used Turbogrid to generate the grid Regards Pankaj N Bid

 January 29, 2002, 02:21 Re: CFD Analysis of Casing and Impeller #6 henry Guest   Posts: n/a hi What is happening in any case is that when you do a complete analysis on the compressor model the flow is well predicted and result is restricted by the grid and the solver,but when you use a single blade placed within periodic boundaries you are assuming that the flow is periodic but even common sense tells us it is not so.but then it is still a good approximation in CFD, So what you need to model is both the the impellor and the diffuser. And above all, postprocessing is very important,where are you doing the postprocessing ,I mean where at the exit,do you have an extended exit? or it it too close to the exit of the blade So you can first do a post processing test at different spacings from the blade tip to the exit and calculate the efficiency and then take the one with the highest efficiency,and this is usually just outside the blade Trailing edge wake area. hope this helps. Henry

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