Hallo!: these two papers look great, specially the one by Wei Wu, in
FL, that refers amazing improvements in heat distribution, the other
is not yet available for download. Hope you like it. Thanks for your
attention. Best regards. Gruß aus Spanien. Salud † Jose
Gros-Aymerich
Spain
Please scan some highlights Jose. You can do that legally as
long as you don't scan the whole thing. I can not afford to download
them.
Paul Lamar
Hi!: the paper about the low friction material is not available
for download yet, regarding the other, it's intended for the small
air-cooled engines used in US Army Drones, basically, the people in the
Florida University, Orlando, have added a 'Heat Pipe' around the
housing, that according to them can be either molded along with housing
with a Powder metallurgy procedure, or grooved in the housing. The heat
pipe, there's a 1982 book by Pergamon press, London, 'Heat Pipes',
copies are available in Abebooks.com (please notice some are from
earlier editions). I've never heard before about 'Heat pipes', the UEL
1100 38-HP engine had installed a 300 mm long circumferential heat pipe,
60 mm wide, 3 mm thick, they obtained a reduction in the temperature
differential (maximum in the hottest part to minimum in coldest) from
159º C to 18º C, and the top temp was reduced from 231º C to129º C. An
uniform temperature along the housing and side plates helps reducing the
thermal distortion, increasing efficiency, power, SFC and engine life.
They added something like a 'thick O-ring' heat pipe to the side plates
with the same aim and results.
The goal is obtaining an uniform temperature all over the engine. As
working fluid for the Heat Pipe they used water, they point that it can
be added after having finished the HP.
I don't know how deep is the problem of temperature variation from zone
to zone in a Mazda size, liquid cooled rotor, housing and side plates,
but perhaps this info is in the K Yamamoto books, if a temperature
non-uniformity exists in the regular Mazda engines' housings, side and
intermediate plates, the idea of adding a HP could be studied.
Basically, the core is in the literature about heat pipes, eg, Inaba H:
'New challenge in Adv Thermal Energy Transportation using Functionally
Thermal Fluids', Intl J Therm Sci, v 39, pp991-1003, 2000; Rasor N.S.
and Desplat JL: 'K-max a material with exceptional Heat Transfer
properties', Proc of 24th Intersoc Energy Convers Engineer Conf, Vol 6,
pp 2487-2852, 1989; Wu W et al: 'Pool Boiling heat Transfer and
simplified one-dimensional model for prediction on coated porous
surfaces with vapor channels', Int J Heat Mass Transfer, V45, pp
1117-1125, 2002;
www.1-act.com Adv Cooling Technologies, Inc; Ferguson
CR and Thomsom A: 'Internal Combustion Engines: Applied Thermosciences',
NY John Wiley and sons, 2001.
Author correspondence is to be addressed to -send apart- please don't
publish this e-mail address, rotaryeng.net has hundreds or thousands of
readers, and I don't want a saturation of this researcher e-mail
address, for those interested, I suggest considering buying the article
for download, it's $24
Sorry, I can't any further without some kind of Copyright infringement,
I guess, hope this is useful enough.
Thanks for your attention. Best regards. Salud †
Jose Gros-Aymerich;
Madrid, Spain
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