Among the many interesting things that can be found in the hangar of my university’s aviation department, the “engine gallery” as I call it always catches my attention. While not extensive or comprehensive in any way, it does have two very interesting exhibits – neither of which have any application whatsoever to the department’s small fleet of Skyhawks and a single Seminole 😀 (though I sometimes hope they could have). Dusty and pretty much ignored, they are two of the probably most famous Soviet turbines ever produced – the Klimov TV2 turboshaft and the Tumansky R-11/13/25 afterburning turbojet…
This though requires a bit of a winded explanation that would not really fit into the photo description box :D. Far from being a simple pipe, the exhaust has a vital role to play as part of the reheat system. Normally, for a fire to burn – and reheat is, in a fashion, just that – oxygen is required. On a turbofan, where there is a substantial amount of air being ducted around the engine core, it is a straightforward matter to divert some of it into the exhaust to aid the combustion of the additional fuel being injected. On a turbojet however, you have to get creative :). The solution adopted for the R-11/13/25 family – and I believe for other turbojets as well – was to duct a small amount of air around the core, just enough to sustain the reheat. The more astute will have noticed that in the above photo, the exhaust has another pipe inside, perforated in the front by a series of small holes. When this assembly is mounted on the back of the engine, air – forced between the two pipes by the low pressure compressor – is blown through the holes, supplying the reheat with oxygen.
One thought on “Engine Photo Report – A Pair Of Famous Soviet Turbines…”
ne želim biti dosadan, ali – bravo, bravo… gušt čitati.