F-35 cooling

Dragon029 · by **Dragon029** » 06 Mar 2016, 03:41

The scoop on top is for cooling the fuel, the other 2 vents go into the engine bay, essentially air-cooling the outside of the engine and whatever else is in there (accessory drive, etc). From there it would have to exit either via the nozzle, ECS, IPP or vents on the fuselage; my bets would be via the nozzle and some of the mesh vents on the bottom of the fuselage.

count_to_10 · by **count_to_10** » 06 Mar 2016, 04:13

Cute thing is that the heat dumped into the bypass air increases the thrust of the engine.
Of course, that increase is probably pretty small, and may or may not exceed the thrust lost to whatever air resistance the installation of the heat exchangers causes, but the heat itself is in the positive direction.

Dragon029 · by **Dragon029** » 06 Mar 2016, 06:17

Just to be clear, this is what I'm saying those intakes do - air goes in those vents and circulates around the outside of the engine; it doesn't become bypass air and it's going to be moving slower than the outside airstream:

Here's a pic of the Super Hornet's nacelle bay:

element1loop · by **element1loop** » 06 Mar 2016, 08:31

Dragon029

Re super hornet bay image above

FYI: Something screwy going with that image Dragon, tried twice to open it in a graphics program via right click to have a closer look and twice immediately got blue screen of death. Never had a graphic do that before. I can copy and paste it in, but not right click to open direct without instant blue screen. I hear the HD shut itself down immediately, both times, it makes a little chirp noise when it stops. So opening the image seems to instantly turn the hard drive off ... triggering a blue screen.

spazsinbad · by **spazsinbad** » 06 Mar 2016, 08:42

The Hornet image is about 2,250 pixels wide at 0.5Mb JPG. It has been saved and opened, copied at source and pasted into graphics program without a problem in Win10, PaintShopPro 9. http://i.imgur.com/90MeJDQ.jpg Now attached.

element1loop · by **element1loop** » 06 Mar 2016, 09:02

spazsinbad wrote:The Hornet image is about 2,250 pixels wide at 0.5Mb JPG. It has been saved and opened, copied at source and pasted into graphics program without a problem in Win10, PaintShopPro 9. http://i.imgur.com/90MeJDQ.jpg Now attached.

Thanks, I'm using same program, v9.01 though, in Win7.

spazsinbad · by **spazsinbad** » 06 Mar 2016, 09:37

Yes I have PSP 9.01 since it became available (& earlier versions). What a terrific program - I'm glad it works OK in Win10.

element1loop · by **element1loop** » 06 Mar 2016, 09:43

spazsinbad wrote:Yes I have PSP 9.01 since it became available (& earlier versions). What a terrific program - I'm glad it works OK in Win10.

I love it as well. Good to know. :wink:

Dragon029 · by **Dragon029** » 06 Mar 2016, 11:36

element1loop wrote:FYI: Something screwy going with that image Dragon, tried twice to open it in a graphics program via right click to have a closer look and twice immediately got blue screen of death.

Yikes, while it likely would have been a bug with Windows, I'd recommend making sure your hard drive or important data is backed up, or looking at doing so in the near future, as it could be an early sign of hard drive failure.

eloise · by **eloise** » 06 Mar 2016, 19:37

Dragon029 wrote:Just to be clear, this is what I'm saying those intakes do - air goes in those vents and circulates around the outside of the engine; it doesn't become bypass air and it's going to be moving slower than the outside airstream:

Here's a pic of the Super Hornet's nacelle bay:

so practicaly it reduce the aircraft body heat , generated by the engine ?

eloise · by **eloise** » 06 Mar 2016, 20:02

btw where is F-22 cooling vens

Dragon029 · by **Dragon029** » 07 Mar 2016, 01:26

eloise wrote:so practicaly it reduce the aircraft body heat , generated by the engine ?

Pretty much, it helps insulate the airframe from the engine itself and it helps keep the things on the outside of the engine (like the FADEC) cool. It may also help keep the exhaust nozzle cool if the air exits out there.

eloise wrote:btw where is F-22 cooling vens

They're either built into the intakes, or they're hidden in the boundary layer separator (the gap between the fuselage and the intake) you can see in this picture for example that the boundary layer gets split to travel both down under the fuselage and also rearwards / upwards, exiting either via a mesh vent above the boundary layer splitters and/or somewhere else further down the fuselage.

garrya · by **garrya** » 07 Mar 2016, 02:41

Dragon029 wrote:Just to be clear, this is what I'm saying those intakes do - air goes in those vents and circulates around the outside of the engine; it doesn't become bypass air and it's going to be moving slower than the outside airstream:

Here's a pic of the Super Hornet's nacelle bay:

Dragon , would you mind if i use this picture in my blog ?

Dragon029 · by **Dragon029** » 07 Mar 2016, 03:04

Feel free

garrya · by **garrya** » 07 Mar 2016, 04:51

Dragon029 wrote:Feel free

Thanks you