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Photo Information
Copyright: Andy Manning (toucan1967) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 723 W: 131 N: 828] (4575)
Genre: Places
Medium: Color
Date Taken: 2008-08-14
Categories: Transportation, Event, Action
Camera: Canon EOS 40 D, Canon EF 100-400mm f/4.5-5.6L IS USM
Exposure: f/9.0, 1/200 seconds
More Photo Info: [view]
Photo Version: Original Version
Theme(s): Dawlish airshow 2008 [view contributor(s)]
Date Submitted: 2008-08-29 8:50
Viewed: 276
Points: 22
[Note Guidelines] Photographer's Note
This is another shot of the Typhoon (Eurofighter 2000) at Dawlish, here it can be seen with the afterburners (Reheat) on and a contrail from the tail.

Thanks to all who view and comment on my pictures.

PP
Converted from RAW
Added Saturation
Added Contrast
Cropped
Added Border
Resized for TL
USM

An afterburner (or reheat) is an additional component added to some jet engines, primarily those on military supersonic aircraft. Its purpose is to provide a temporary increase in thrust, both for supersonic flight and for takeoff (as the high wing loading typical of supersonic aircraft designs means that take-off speed is very high). On military aircraft the extra thrust is also useful for combat situations. This is achieved by injecting additional fuel into the jet pipe downstream of (i.e. after) the turbine. This fuel is ignited by the hot exhaust gases and adds greatly to the thrust of the engine. The advantage of afterburning is significantly increased thrust; the disadvantage is its very high fuel consumption and inefficiency, though this is often regarded as acceptable for the short periods during which it is usually used.

Jet engines are referred to as operating wet when afterburning is being used and dry when the engine is used without afterburning.[1] An engine producing maximum thrust wet is at maximum power (this is the maximum power the engine can produce); an engine producing maximum thrust dry is at military power.

A jet engine afterburner is an extended exhaust section containing extra fuel injectors, and since the jet engine upstream (i.e., before the turbine) will use little of the oxygen it ingests, the afterburner is, at its simplest, a type of ramjet. When the afterburner is turned on, fuel is injected, which ignites readily, owing to the relatively high temperature of the incoming gases. The resulting combustion process increases the afterburner exit (nozzle entry) temperature significantly, resulting in a steep increase in engine net thrust. As well as an increase in afterburner exit stagnation temperature, there is also an increase in nozzle mass flow (i.e. afterburner entry mass flow plus the effective afterburner fuel flow), but a decrease in afterburner exit stagnation pressure (owing to a fundamental loss due to heating plus friction and turbulence losses).

The resulting increase in afterburner exit volume flow is accommodated by increasing the throat area of the propulsion nozzle. Otherwise, the upstream turbomachinery rematches (probably causing a compressor stall or fan surge in a turbofan application).

To a first order, the gross thrust ratio (afterburning/dry) is directly proportional to the root of the stagnation temperature ratio across the afterburner (i.e. exit/entry).

Info from Wikipedia
Kilted-Arab, lisapw1, rewind has marked this note useful
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Critiques [Translate]

Amazing color. Good light and bright, very good sharp. Original job.
best regards
hikmet

  • Great 
  • BT123 Silver Star Critiquer/Silver Note Writer [C: 41 W: 1 N: 44] (341)
  • [2008-08-29 10:06]

Hi Andy,
I am surprised that you got a such a sharp shot using 1/200 per second. Good DOF, colour and the diagnol line created by the exhaust fume is great.
Well done
Regards
Balwant

  • Great 
  • datis Gold Star Critiquer/Silver Note Writer [C: 119 W: 4 N: 26] (601)
  • [2008-08-29 10:08]

Hi Andy,

Amazing shot of eurofighter. Very sharp and nice sky color in background.

TFS.
Daryoosh

Just love it!

TFS


Marc

very sharp for high speeed object like this!
love this shot!
tfs!
ronan

Hi Andy...fantastic shot of this great plane...excellent.

Roger

Pretty impressive addition to your recent aircraft series, Andy - you have taken some cracking shots and this is no exception. Crisp, good details and the afterburner/contrail combo is the icing on the cake. Very nice shot!

Hi Andy,

You "ACED" this one! It's terrific with the afterburner....... I'm usually so amazed at the planes and the talent of the pilots that I forget to take the photo. LOL

thanks for sharing another of my favorite subjects! Lisa

  • Great 
  • EOSF1 Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 1528 W: 137 N: 2149] (19224)
  • [2008-08-30 19:04]

Hello Andy, your plane shots are just incredible, so much great details and fantastic exposure, well done my friend, thanks!

Mario

Great diagonal crop.
What I love mostly about this photo are the afterburners!

Thomas

  • Great 
  • rewind Gold Star Critiquer/Gold Note Writer [C: 101 W: 6 N: 124] (1028)
  • [2008-09-10 12:01]

Andy, a superb photo and an interesting note. The increase in the throat area (achieved by opening the dark vanes seen at the jet outlet nozzles on your photo) helps to reduce the discharge pressure imposed on the turbine. What causes a stall on the engine is high differential pressure, either caused by high discharge pressure or low suction pressure at the intake (not usually a problem for a jet engine but can happen with industrial centrifugal compressors). TFS, Les

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