As yet, I do not have an information package available to be distributed but that is indeed the objective over the next year.
I'm sure there are manufacturers in Peru with casting facilities and I was just using this as an example. Would a design procedure involving casting as the manufacturing process be of more use for you? In which country are you based? -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] Behalf Of HYDRO Sent: 07 September 2005 12:12 To: [email protected] Subject: Re: [microhydro] boat propellers as runners Robert: The basic question is : How can us attain the technical information to define and conform the metal to the necessary shape, some countries do have capability to do metal casting, How can we obtain the technical ( mathematical formulas and processes) for such endeavor. I find that many have to use Bankis ( locally built) and adapt to the situation due to the lack of the necessary info to fabricate the propellers. If you have such information available, I will be one requesting it, and as an Engineer I would assist others to become proficient in the use of the information package. Strange that Peru does not have metal casting capabilities, unless it is a local problem and not a national lack of capabilities. So, can you send to me a technical package, I can take in English, Spanish (native language), French, and, as well, Italian and Portuguese. Regards Nando ----- Original Message ----- From: "Simpson, Robert" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Wednesday, September 07, 2005 4:38 AM Subject: RE: [microhydro] boat propellers as runners > The existing turbine has a rotor diameter of 300mm for a speed approx. 800 > rpm, H=4m and Flow=150-180 l/s. Which should produce about 4kW-5kW, > without generator and mechanical efficiency included. If you increase the > operating speed for the same site conditions, the diameter needed > decreases and the blade angles need to be recalculated. A similar powered > turbine with a lower head of say H=2m but with a larger flow rate of 340 > l/s would require a larger diameter runner and a slower operating speed > (maybe 400-500rpm). In this case, the diameter could be as high as 500mm > depending on what specific speed you choose. So I suppose, propeller > diameter anywhere up to 500mm might be of potential use if they match the > blade angles needed for a specific set of turbine operating conditions. > > The main constraint with regard to developing countries is that the method > of manufacture is cost-effective for local manufacturers and the equipment > and materials are readily available. For example, the manufacturer we are > working with in Peru only has basic equipment such as sheet metal bender, > welder and a method to heat the metal for shaping. No casting or milling > processes are required. > > Another low-cost option might be to use a suitable boat propeller but as > was outlined in the previous post by Eilrem it can be difficult to source > a specific prop that suits the diameter and blade angles that you require > for the site conditions. It is an iterative process to a certain extent so > if a suitable prop is sourced then the speed of the turbine can be > adjusted to suit within limits. > > regards > Robert > > > > -----Original Message----- > From: [email protected] [mailto:[EMAIL PROTECTED] > Behalf Of Girish Kharel > Sent: 04 September 2005 22:05 > To: [email protected]; Simpson, Robert > Subject: Re: [microhydro] boat propellers as runners > > > This sounds like an interesting project. For a range of head (say up to > 10m) > and flow conditions in the 0-5 kW power range, what would be the > corresponding speed and rotor diameter? This would then give an indication > of the sizes of propellers that we are interested in. I am assuming that > you > have already done the theoretical work on the application range. > > You mention that the design is for use in developing countries. What > particular conditions/constraints do you have in mind? > > Regards > > Girish > > ----- Original Message ----- > From: "Simpson, Robert" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Tuesday, September 06, 2005 2:47 PM > Subject: RE: [microhydro] boat propellers as runners > > >> Do you have any more details about schemes where a boat propeller was >> used > or modified for use for a low-head turbine? >> >> I am currently working on a project to develop a design method for > cost-effective manufacture of propeller turbines in the pico-hydropower > range (ie 0-5kW). The focus so far on the method of manufacture for the > runner has been to cut the blade shape from flat sheet steel and then bend > and twist into the desired geometry using some heat and hammer. From > computer simulations conducted so far it doesn't appear that much > efficiency > is lost by using constant thickness blades as opposed to profiled blades, > as > long as the pitch angles and twist are designed correctly for the site > conditions (head, flow rate, operating speed). These will hopefully be > confirmed soon with field testing of a prototype turbine. >> >> The overall aim of the project is to develop a design manual and software > that can be used for the design of low-head propeller turbines for use in > developing countries. Any other comments, advice or potential case studies > etc.... would be most welcome. >> >> Robert Simpson >> >> >> >> -----Original Message----- >> From: [email protected] [mailto:[EMAIL PROTECTED] >> Behalf Of [EMAIL PROTECTED] >> Sent: 05 September 2005 22:12 >> To: [email protected] >> Subject: Re: [microhydro] boat propellers as runners >> >> >> Boat propellors definately do work in micro hydro. If you machine the >> rounded tips off a bit , they are even better. Add some pre swirl vanes, > or a >> scroll case and you have a low cost approach >> >> >> [Non-text portions of this message have been removed] >> >> >> >> >> >> >> >> 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. 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