Hello, The FRANJIC.DOC file is not available yet on microhydropower. I don't find it on google too.
Could you please bring me a copy (i may try to make a banki i the future, and i think this document will be very interisting for me) Thanks Regards Eric ----Message d'origine---- >A: [email protected] >De: Max Enfield <[EMAIL PROTECTED]> >Date: Sun, 18 Dec 2005 21:34:53 +1000 >Sujet: Re: [microhydro] nozzle design for crossflow > >"[EMAIL PROTECTED]" wrote: >> >> Hi, >> >> I am another newbie to the group, with a question. >> I currently have a 12" (diameter) x 22" crossflow turbine set horizontally >> at the end of a 11" (interior diameter) 13" (OD) pipe from a pond providing >> 10' useable head. There is enough water to run the pipe full. The turbine >> is set and works well, but I have not yet achieved a good nozzle design, in >> particular: >> what is the configuration and size of the rectangular opening, and how is >> the shielding set up to allow water to reach the turbine blades without >> waste. Diagrams, references, ideas welcome. Thanks. Chas Daloz > >Chas, > >It is convenient to classify crossflow turbines according to their nozzle >design >and the method used to regulate part flow. As you may be aware crossflow >turbines are able to operate over a wide range of head and flow conditions. The >high part flow efficiency of this design makes it very suitable for these >applications. > >The classification is: > a simple valve or segment (Banki), > hydraulic flap (Ossberger) > profile shaped semicircular segment (Cink). > >A posting to this group dated 12 Feb 1999 from "Jerrytex Ltd." ><[EMAIL PROTECTED]> contained an attachment named FRANJIC.DOC. It contains >much of interest on this topic including detailed drawings of the Ossberger and >Cink type of nozzles. If you are unable to locate this document from the >group's archives, please let me know and I will email you a copy. > >The Banki type is the easiest to make, although perhaps it is a little less >efficient than the others. Adjustment so that the stream strikes the blades >correctly is essentially one dimensional. We have found that the >stream has a tendency to fly over the top of the runner, however this can be >greatly reduced by careful adjustment. Note that only a small number of blades >are active in transferring power from the stream to the shaft at any one time. >This generates vibration and much greater stresses on the blades than would >otherwise be the case. For the Ossberger and Cink types this is much less of an >issue. > >For the Banki type, the water exits the nozzle as a narrow stream having a >rectangular cross section, with a width equal to the runner width and a >thickness typically equal to 9.5% to 10% of the runner diameter, at full flow. >This is the maximum thickness possible - increasing this value will allow more >water through but will not increase output. Indeed it may even flood the >turbine. > >The nozzle stream can however be thinner, and this is one >of the nice things about the crossflow turbine - it performs well on >part flow. A stream thickness of approx. 3.5% of runner diameter is >considered the practical lower limit. We have built turbines with an >adjustable flap that permits the depth of the stream to be adjusted >according to the available flow. > >The software I use for doing the calculations you are now concerned with is at: >http://www.planetarypower.com.au/info/microhydro/WalshHydro.xls It covers much >more than you need, so just pick out the bits that interest you. The >accompanying manual is at >http://www.planetarypower.com.au/info/microhydro/crossflow_design.pdf > >Hope this helps and best of luck, > >Regards, > >Max Enfield >Planetary Power > > > > > >Does your company feature in the microhydro business directory at >http://microhydropower.net/directory ? If not, please register free of charge >and be exposed to the microhydro community world wide! > >NOTE: The advertisements in this email are added by Yahoogroups who provides >us with free email group services. The microhydro-group does not endorse >products or support the advertisements in any way. > >More information on micro hydropower at http://microhydropower.net > >To unsubscribe: send empty message to [EMAIL PROTECTED] >Yahoo! Groups Links > > > > > > > ------------------------------------------------------------- NetCourrier, votre bureau virtuel sur Internet : Mail, Agenda, Clubs, Toolbar... Web/Wap : www.netcourrier.com Téléphone/Fax : 08 92 69 00 21 (0,34 TTC/min) Minitel: 3615 NETCOURRIER (0,16 TTC/min) ------------------------ Yahoo! Groups Sponsor --------------------~--> Get fast access to your favorite Yahoo! Groups. 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