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#17
October 28th 03, 01:54 AM
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Sorry for the duplicate posts. Because of an error message, I thought the
first one had disappeared into thin air. :-) Russell Kent Russell Kent wrote: Dave Hyde wrote: Russell Kent wrote: The original NACA references specifically say *NOT* to use NACA-style entrances for heat exchangers (oil coolers, radiators). Do they say why? Submerged NACA ducts do not allow much air diffusion; they're for feeding large quantities of air to jet engines. Radiators work best with highly diffused air (large dynamic pressure recovery). See pgs 18-19 of: http://naca.larc.nasa.gov/reports/1945/naca-acr-5i20/ If you're determined to have NACA submerged ducts, you might want to study these NACA reports to get the best duct shape: http://naca.larc.nasa.gov/reports/1948/naca-rm-a8a20/ http://naca.larc.nasa.gov/reports/1948/naca-rm-a7i30/ http://naca.larc.nasa.gov/reports/1942/naca-report-743/ Russell Kent 
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