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Boat Forum / Building / April 2007Piston with cooling channel
Has anyone heard about pistons with cooling channels machined inside them?? I recently came across such kinds of pistons that are used in big marine engines. Can someone tell me the approximate stroke and bore of these pistons?? what will be the typical size of a connecting rod used in marine engines?? Thank you > Has anyone heard about pistons with cooling channels machined inside > them?? I recently came across such kinds of pistons that are used in > big marine engines. Can someone tell me the approximate stroke and > bore of these pistons?? what will be the typical size of a connecting > rod used in marine engines?? > Thank you http://people.bath.ac.uk/ccsshb/12cyl/  Signature“TAANSTAFL” ____________________________________________________________________________ "A prudent man foresees the difficulties ahead and prepares for them; The simpleton goes blindly on and suffers the consequences." - Proverbs 22:3 ____________________________________________________________________________ Rahul, A great number of real engines (bore>6'[150mm]) have cooling features under the piston crown, even some small truck engines have them. Few are machined, but many are cast of forged that way. If you are looking for the engines that actually circulate coolant inside that piston, that is only common in crosshead design engines that have a separate piston rod that is attached to a crosshead bearing and that is attached to the connecting rod to the crankshaft. This type of engine is common in the 1m bore class engines. I have seen it as small as 600mm bore class. These engines have a coolant feed to the crosshead and then coolant is piped up the piston rod to the piston and returned to the crosshead. Try some searching on Sulzer and Burmeister&Wain. They both build engines this size and type. Matt Colie > Has anyone heard about pistons with cooling channels machined inside > them?? I recently came across such kinds of pistons that are used in > big marine engines. Can someone tell me the approximate stroke and > bore of these pistons?? what will be the typical size of a connecting > rod used in marine engines?? > Thank you > Rahul, > [quoted text clipped - 25 lines] > > - Show quoted text - dazed and confuzzed - thank you for your reference to the world's biggest diesel engine. I have actually seen it one year ago, but forgot that it had piston cooling Matt colie - Your information is really valuable and i got more info by searching for sulzer pistons.. You have really helped me a lot for my project.. As I am doing a heat transfer analysis on pistons, i needed these information about the piston stroke, bore and the cooling channel dimensions.. What can be the approximate values for the following? Bore - 60cm?? Stroke - 90cm?? Engine rpm - 100 cooling channel dia - 1cm?? Inlet velocity of water or oil - 1m/s?? Piston crown temperature - 500 K?? As of now, I have modeled a 3d cooling channel which has an inlet(vertical) at one extreme extending onto the piston crown, taking a semicircular path around the underneath of the crown(horizontal) and an outlet(parallel to the inlet) at the other extreme.. Is this atleast remotely realistic?? Rahul, I am afraid I have to let you down here. I have never seen the interior layout of the piston cooling passages. The only few things I can tell you for fact at this time is that Stroke is approximately bore * 2 the (B&W K98 are 2.0m) The K98 engine is published to run at 100rev/min and ~6000kw per cylinder. If you can get to an engineering library, look up the Diesel and Gas Turbine Catalog. It should give you contacts and Sulzer and B&W (what ever they are called today). You can probably get some information there. As a student marine engineer, I was give a very nice tour of the facility in Kobenhavn. Best of luck Matt Colie > Matt colie - Your information is really valuable and i got more info > by searching for sulzer pistons.. You have really helped me a lot for [quoted text clipped - 16 lines] > an outlet(parallel to the inlet) at the other extreme.. Is this > atleast remotely realistic?? > Rahul, > [quoted text clipped - 38 lines] > > - Show quoted text - I knew it was too much to ask you about these details.. I just had a wild hope.. thats all.. If i had got this information a month back, i would have enquired further into the dimensions of the piston(because i'm nearing the deadline for my project) anyways.. Thank you for your interest in my problem.. Thanks to google for making it so easy to get information from across the world.. Hello Rahul, What I would do: 1. Check the libraries of the technical universities in the Netherlands and order the books/studies of my choice to be sent to the local library. http://aleph.library.tudelft.nl/F/LJX4V2V949YU6B9TQQ2Q4NDN9HTHP7DB4X5B3B38QI7SIL 48FG-01311?func=file&file_name=find-b Not much new since I left school 2. Check the bookstores equivalent to Amazon and second hand markets online 3. Check the builders http://www.wartsila.com/ http://www.manbw.com/ Contact these guys for information and ask them for access to their technical manuals online for studying purposes. They are hiring qualified staff at Wartsila in the Netherlands, so be eager and willing. 4. There is some material around and the dimensions are fair enough to be used and to be scaled in calculations. When using this averaged data your calculations could be within 10% of actual http://www.wartsila.com/Wartsila/global/docs/en/ship_power/media_publications/ma rine_news/2004_2/marketing_rtflex50.pdf The piston comprises a forged steel crown with a very short skirt. It has combined jet-shaker oil cooling and is equipped with four rings of the same thickness. Calculated surface temperatures are all optimized for thermal strains in the cover and piston crown... Hope I could be of any help, my books and manuscripts are 35 years old and the data of performance runs in former vessels will not do for your purpose, its too general. Groeten www.4eggsco.nl > Has anyone heard about pistons with cooling channels machined inside > them?? I recently came across such kinds of pistons that are used in > big marine engines. Can someone tell me the approximate stroke and > bore of these pistons?? what will be the typical size of a connecting > rod used in marine engines?? > Thank you |
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