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14:59 Dec 15, 2011
French to English translations [PRO] Tech/Engineering - Aerospace / Aviation / Space
French term or phrase:bol mélangeur
patent to do with jet engine
"... et qui sont reliées en amont à des moyens de centrage et de guidage d’une tête de l’injecteur correspondant, et en aval à un bol mélangeur monté dans l’orifice correspondant de la paroi de fond de chambre."
The "orifice" here is, an expert will probably know, an air inlet. So we are talking about blending fuel and air, rather than cream and eggs in a "blender bowl". Techie terms from Ernst for "bol" include "bole", "basket", "hopper feeder"... but none of the above seem to fit too well.
Explanation: Hard to be more than medium certain, just in case this is some exciting new development in jet-engine technology, but I suspect it's the swirl cup or swirler, one of several chambers arranged radially around the engine where fuel and air are mixed.
-------------------------------------------------- Note added at 1 hr (2011-12-15 16:23:42 GMT) --------------------------------------------------
DOME / SWIRLER
The dome and swirler are the part of the combustor that the primary air (see Air flow paths below) flows through as it enters the combustion zone. Their role is to generate turbulence in the flow to rapidly mix the air with fuel.[8] Early combustors tended to use bluff body domes (rather than swirlers), which used a simple plate to create wake turbulence to mix the fuel and air. Most modern designs, however, are swirl stabilized (use swirlers). The swirler establishes a local low pressure zone that forces some of the combustion products to recirculate, creating the high turbulence.[11] However, the higher the turbulence, the higher the pressure loss will be for the combustor, so the dome and swirler must be carefully designed so as not to generate more turbulence than is needed to sufficiently mix the fuel and air.[12] http://en.wikipedia.org/wiki/Combustor
[look at the diagram alongside "Air flow paths" - http://upload.wikimedia.org/wikipedia/commons/thumb/4/49/Com...
that there is an error: air is compressed, fed into the combustion chamber where it is mixed with atomised fuel, ignited, subsequently heats up, expands, and drives a turbine. The mixing process is absolutely crucial, and companies like RR spend millions chasing fractions of a percent in efficiency and output. Generally, the mixer and combustion chamber are one and the same thing, though (and I couldn't be sure, since I only worked on aero derivatives) they may be separate for large industrial gas turbines.
ah, sorry, maybe "inlet" is not right, maybe I should be talking about "air injection"... if so, the "official" translation of the title of the patent online makes the same mistake... maybe this can throw a bit of light on what's happening:
"Chaque système d’injection comporte au niveau de ses vrilles de turbulence, de ses moyens de centrage et de guidage de tête d’injecteur, et de son bol mélangeur, des orifices destinés à l’injection, dans la chambre de combustion, d’une partie du flux d’air provenant du compresseur de la turbomachine."
of the jet engine does this bol melangeur reside? "orifice" seems to be the opening at the end of the compression stage into the combustion chamber, otherwise it doesn't seem to make much sense: you don't inject fuel at the air inlet of a jet engine but only after the air has been compressed considerably.
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Answers
43 mins confidence:
mixer
Explanation: possibly adding "spherical" to include the "bol" part
Ronald van Riet Local time: 17:51 Specializes in field Native speaker of: Dutch, English PRO pts in category: 23
Explanation: Hard to be more than medium certain, just in case this is some exciting new development in jet-engine technology, but I suspect it's the swirl cup or swirler, one of several chambers arranged radially around the engine where fuel and air are mixed.
-------------------------------------------------- Note added at 1 hr (2011-12-15 16:23:42 GMT) --------------------------------------------------
DOME / SWIRLER
The dome and swirler are the part of the combustor that the primary air (see Air flow paths below) flows through as it enters the combustion zone. Their role is to generate turbulence in the flow to rapidly mix the air with fuel.[8] Early combustors tended to use bluff body domes (rather than swirlers), which used a simple plate to create wake turbulence to mix the fuel and air. Most modern designs, however, are swirl stabilized (use swirlers). The swirler establishes a local low pressure zone that forces some of the combustion products to recirculate, creating the high turbulence.[11] However, the higher the turbulence, the higher the pressure loss will be for the combustor, so the dome and swirler must be carefully designed so as not to generate more turbulence than is needed to sufficiently mix the fuel and air.[12] http://en.wikipedia.org/wiki/Combustor
[look at the diagram alongside "Air flow paths" - http://upload.wikimedia.org/wikipedia/commons/thumb/4/49/Com...
xxxBourth Local time: 17:51 Native speaker of: English PRO pts in category: 147
The translation workplace 
