CH326697A

CH326697A - Liquid fuel combustion device

Info

Publication number: CH326697A
Authority: CH
Inventors: Allen Sidney
Original assignee: Armstrong Siddeley Motors Ltd
Priority date: 1952-12-20
Filing date: 1953-12-11
Publication date: 1957-12-31
Also published as: BE525083A

Description

Dispositif de combustion ä combustible liquide L'invention a pour objet un dispositif de combustion ä combustible liquide, comprenant un evaporateur pour ce combustible. Ce dispo- sitif de combustion pourrait etre, par .exem- ple, 1e dispositif de combustion principale dune Installation motrice ä turbine ä gaz ou un dis- positif de combustion pour 1e rechauffage ou la post-combustion dune teile Installation, ou en- core 1e dispositif de combustion dune Installa tion de propulsion par reaction. Liquid fuel combustion device The subject of the invention is a liquid fuel combustion device, comprising an evaporator for this fuel. This combustion device could be, for example, the main combustion device of a gas turbine engine plant or a combustion device for the reheating or post-combustion of such a plant, or even the combustion device of a jet propulsion plant.

L'evaporateur du dispositif faisant 1'objet de 1'invention comprend une enveloppe dispo- see avec jeu radial ä 1'interieur d'un conduit de ce dispositif destine ä etre parcouru par un courant principal d'oxydant gazeux, et ce dis- positif est caracterise en ce que ladite envelop- pe de 1'evaporateur est fermee ä son extremite amont et ouverte ä son extrdmite aval, et en ce qu'il comprend des moyens pour amener du combustible liquide jusque Sur la face exte- rieure de 1'enveloppe, de maniere que ce com- bustible soit balaye 1e long de la surface exte- rieure de 1'enveloppe par 1e courant principal d'oxydant traversant ledit conduit, 1'ouverture de 1'extrdmite aval de 1'enveloppe provoquant, sous 1'action dudit courant principal passant au-delä de cette extremite ouverte, une d6pres- sion ä 1'interieur de 1'enveloppe, et cette depres- sion attirant ä 1'interidur de 1'enveloppe une Charge de combustible evapore et d'oxydant, de Sorte que cette Charge, en brillant ä 1'inte- rieur de 1'enveloppe, fournit de la chaleur pour dvaporer 1e combustible liquide amene Sur la face exterieure de 1'enveloppe et maintient une zone de flamme stable ä partir de laquelle la combustion du reste du combustible evapore et de 1'oxydant parvenant en aval de 1'enve- loppe est assurde. The evaporator of the device which is the subject of the invention comprises a casing arranged with radial clearance inside a duct of this device intended to be traversed by a main stream of gaseous oxidant, and this dis- positive is characterized in that said envelope of the evaporator is closed at its upstream end and open at its downstream end, and in that it comprises means for bringing liquid fuel to the outer face of 1 casing, so that this fuel is swept along the outer surface of the casing by the main flow of oxidant passing through said conduit, the opening of the downstream end of the casing causing, under the action of said main current passing beyond this open end, a depression inside the envelope, and this depression drawing inside the envelope a Charge of evaporated fuel and oxidizer, so that this Charge, glowing inside the shroud, provides heat to evaporate the liquid fuel brought to the outer face of the shroud and maintains a stable flame zone from which to the combustion of the rest of the evaporated fuel and of the oxidant arriving downstream of the casing is assured.

Le dessin represente, ä titre d'exemple, plu- sieurs formes d'exdcution et des variantes du dispositif de combustion faisant 1'objet de 1'in- vention. The drawing shows, by way of example, several embodiments and variants of the combustion device which is the subject of the invention.

La fig. 1 est une vue d'ensemble, en 616va- tion laterale, dune Installation de propulsion munie de l'une de Ces formes d'execution. fig. 1 is an overall view, in side elevation, of a propulsion installation provided with one of these embodiments.

La fig. 2 est une vue en coupe schdmatique, ä plus grande echelle, dune premiere forme d'execution du dispositif. fig. 2 is a schematic sectional view, on a larger scale, of a first embodiment of the device.

Les fig. 3 et 4 sont des vues analogues ä celle de la fig. 2 representant des variantes de la premiere forme d'execution. Figs. 3 and 4 are views similar to that of FIG. 2 representing variants of the first embodiment.

Les fig. 5 .et 6 sont respectivement une vue en coupe axiale et une vue en coupe transver- sale dune deuxieme forme d'execution, la vue de la fig. 5 etant prise selon- 5-5 de la fig. 6. Figs. 5 and 6 are respectively an axial sectional view and a transverse sectional view of a second form of execution, the view of FIG. 5 being taken according to 5-5 of FIG. 6.

La fig. 7 est une vue en coupe axiale dune troisieme formeRTI ID="0001.0267" WI="18" HE="3" LX="1313" LY="2282"> d'execution. La fig. 8 est une vue en coupe axiale dune quatrieme forme d'execution ; et la fig. 9 .est une demi-vue en coupe axiale dune cinquieme forme d'execution. L'installation de propulsion reprdsentde ä la fig. 1 comporte une admission d'air 20, un compresseur ä dcoulement axial logo Jans une Partie dune enveloppe ddsign6e par 1e signe de reference 21, un dispositif de combustion disposd en 22, une turbine ä dcoulement axial disposde dans la zone 23, et un conduit d'dchap- pement, ddsigne par 1e signe de refdrence 24 et aboutissant ä une tuyere de propulsion par reaction. fig. 7 is an axial sectional view of a third formRTI ID="0001.0267" WI="18" HE="3" LX="1313" LY="2282"> execution. fig. 8 is an axial sectional view of a fourth embodiment; and fig. 9. is a half-view in axial section of a fifth form of execution. The propulsion installation represented in FIG. 1 comprises an air intake 20, an axial flow compressor logo Jans a part of an envelope designated by the reference sign 21, a combustion device arranged at 22, an axial flow turbine arranged in the zone 23, and a conduit exhaust, designated by the reference sign 24 and leading to a jet propulsion nozzle.

Les formes d'execution du dispositif reprd- sent6 aux fig. 2, 5, 6 et 9 sont principalement congues comme dispositifs servant au r6chauf- fage des gaz d'dchappement de 1a "turbine 23, tandis que les variantes et les formes d'ex6cu- tion representdes aux fig. 3, 4, 7 et 8 sont des dispositifs de combustion principaux destines ä eire dispos6s dann la zone 22. The forms of execution of the device represented in FIGS. 2, 5, 6 and 9 are mainly designed as devices serving to heat the exhaust gases from the turbine 23, whereas the variants and embodiments shown in FIGS. 3, 4, 7 and 8 are main combustion devices intended to be used in zone 22.

Dans toutes les formes d'execution et va- riantes representees, 1'evaporateur du disposi- tif de combustion comprend au moins une en- veloppe presentant une extremitd aval evasee, comme indique en 25, dans 1e but de renfor- cer 1'induction Jans cette enveloppe, comme indique par des fleches recourbees 26, dune Partie du courant principal d'oxydant s'dcou- lant dans la direction indiquee par des fleches 27. Cela est valable aussi bien pour les dis- positifs du type annulaire que pour ceux du type tubulaire. In all the embodiments and variants represented, the evaporator of the combustion device comprises at least one casing having a flared downstream end, as indicated at 25, for the purpose of reinforcing the induction. In this envelope, as indicated by curved arrows 26, a part of the main oxidant flow flowing in the direction indicated by arrows 27. of the tubular type.

La forme d'exdcution representde ä la fig. 2 comprend un dvaporateur presentant une enveloppe annulaire 31 disposde coaxialement avec jeu radial ä 1'interieur du conduit 24 et qui est supportee en trois points, espacds ä 1200 les uns des autres, ä partir de la paroi du conduit 24 et par des paires de Supports 32 dopt un seul est represente. Ces Supports sont fixes- ä 1'enveloppe 31 et chevauchent chacun un bloc de montage 33 fixe ä la paroi du con- duit 24, les Supports 32 dtant fixes aux blocs 33 par des boulons 34. L'extrdmitd amont fermee de 1'enveloppe 31 est arrondie de fagon convexe et est dispo- see en aval d'un conduit distributeur de com- bustible 35 qui regoit du combustible par un conduit 36 traversant la paroi du conduit 24. Le combustible sortant du conduit 35 par des trous 35b et 35c dopt les axes sont divergents et qui sont pratiques du cötd aval du conduit 35, suivant des rangees circulaires est dirige vers 1'extrdmite convexe de 1'enveloppe 31 pour etre balaye 1e long des faces exterieures radia- lement interieure et extdrieure de 1'enveloppe 31 par 1e courant d'oxydant parcourant 1e con- duit 24. Le m61ange de combustible et d'oxy- dant penetrant dans 1'extrdmite aval evasde de 1'.enveloppe@est allumd par une flamme veilleuse produite Jans un dispositif d'allumage indiqud de fagon generale par un rectangle 38 et_pro- venant d'un tube 37 qui ddbouche dans 1'en- veloppe 31. Lorsque la combustion est etablie ä 1'interieur de 1'enveloppe 31, la chaleur en gendr6e par cette combustion evapore 1e com- bustible s'ecoulant sur les faces extdrieures de 1'enveloppe 31, de maniere ä fournir du com- bustible pour entretenir la combustion ä 1'intd- rieur de cette enveloppe et ä assurer une com- bustion principale dans une zone de flamme principale qui s'6tend en aval de 1'enveloppe 31. The embodiment shown in FIG. 2 comprises an evaporator having an annular shell 31 disposed coaxially with radial clearance within the conduit 24 and which is supported at three points, spaced 120° apart, from the wall of the conduit 24 and by pairs of Supports 32 dopt only one is represented. These Supports are fixed to the casing 31 and each straddles a mounting block 33 fixed to the wall of the duct 24, the Supports 32 being fixed to the blocks 33 by bolts 34. The closed upstream end of the casing 31 is rounded in a convex manner and is disposed downstream of a fuel distributor pipe 35 which receives fuel through a pipe 36 passing through the wall of the pipe 24. The fuel leaving the pipe 35 through holes 35b and 35c whose axes diverge and which are convenient on the downstream side of conduit 35, in circular rows is directed toward the convex end of shroud 31 to be scanned along the radially inner and outer outer faces of the shroud. 31 by the current of oxidant passing through conduit 24. The mixture of fuel and oxidant entering the vented downstream end of the shroud is ignited by a pilot flame produced in an igniter. generally indicated by a rectangle 38 and coming from a tube 37 which emerges into the jacket 31. When combustion is established within the jacket 31, the heat generated by this combustion evaporates the fuel flowing over the outer faces of the casing 31, so as to supply fuel to sustain the combustion inside this casing and to ensure a main combustion in a flame zone main which extends downstream of the casing 31.

Dans la variante de la fig. 3, un courant suppldmentaire de combustible et d'oxydant est introduit dans 1'enveloppe 31 par plusieurs tuyaux 39, en forme de J, quisont disposes selon une rangee circulaire, l'une 39a des branches de chaque tuyau s'etendant jusqu'ä 1'interieur de 1'extrdmite aval de 1'enveloppe 31. Les au- tres branches 39b desdits tuyaux se trouvent hors de 1'enveloppe 31 et s'etendent vers 1'avant de fagon ä capter un courant d'oxydant qui les traverse. De plus, un conduit de distribution de combustible supplementaire 40, alimente par un conduit 41 qui s'etend jusqu'ä 1'intd- rieur de la tuyere 24, est prevu pour fournir du combustible ä 1'interieur de chacune des branches 39b des tuyaux 39, ä travers des orifices 40a. 11 est possible de commander in d6pendamment les alimentations en combus- tible ä travers les conduits 36 et 41, de ma- niere ä assurer tout r6glage desird de la quan- tite de combustible pdndtrant ä l'int6rieur de 1'enveloppe 31. Les branches 39a s'dtendent de pref6rence jusqu'au voisinage de 1'extremit6 amont de l'int6rieur de 1'enveloppe 31, de ma- niere ä fournir un mdlange combustible dans cette rdgion, et la combustion qui se produit ä l'int6rieur de 1'enveloppe chauffe en outre les branches 39a de faron ä 6vaporer 1e combus- tible passant ä travers ces branches. In the variant of fig. 3, an additional stream of fuel and oxidant is introduced into shroud 31 through a plurality of J-shaped pipes 39 which are arranged in a circular row, one branch 39a of each pipe extending to the interior of the downstream end of the casing 31. The other branches 39b of said pipes are located outside the casing 31 and extend forwards so as to capture a current of oxidant passing through them. . In addition, an additional fuel delivery conduit 40, fed by a conduit 41 which extends to the interior of the nozzle 24, is provided to supply fuel to the interior of each of the legs 39b of the nozzles. pipes 39, through ports 40a. It is possible to independently control the fuel supplies through the conduits 36 and 41, so as to provide any desired adjustment of the quantity of fuel entering the interior of the envelope 31. 39a preferably extend to near the upstream end of the interior of the casing 31, so as to provide a combustible mixture in this region, and the combustion which takes place inside the casing 1 The shroud further heats the faron legs 39a to evaporate the fuel passing through these legs.

Dans la variante de la fig. 4, les tuyaux en forme de J sont dispos6s diff6remment. Un Beul de ces tuyaux est repr6sente et est d6sign6 par 1e signe de r6fdrence 139. 11 s'6tend ä tra vers 1'extr6mit6 amont de 1'envelöppe 31, de sorte. que pratiquement, la totalit6 de sa lon- gueur est soümise ä la chaleur produite ä 1'in- t6rieur de 1'enveloppe, cette chaleur contri- buant ainsi ä 1'evaporation du combustible fourni ä travers les tuyaux en forme de J. In the variant of fig. 4, the J-shaped pipes are arranged differently. One such pipe is shown and is designated by the reference sign 139. It extends through the upstream end of the casing 31, so. that practically its entire length is subjected to the heat produced within the envelope, this heat thus contributing to the evaporation of the fuel supplied through the J-shaped pipes.

Dans la deuxieme forme d'ex6cution du dispositif repr6sent6e aux fig. 5 et 6, 1'enve- Joppe annulaire de 1'fivaporateur est suspendue ä l'int6rieur du conduit parcouru par 1'oxydant par trois bielles fourchues 42 qui s'etendent ä partir dun croisillon ä trois bras 43, les extre- mites ext6rieures des bras de ce croisillon pre- sentant des tUes de plus grand diametre 45 munies de prolongements filet6s qui s'6tendent ä travers des bossages 47 pravus ä 1'ext6rieur du conduit pour 1'oxydant et qui sont fixds au moyen d'6crous 48. Un conduit distributeur de combustible 35 est semblablement support6 par trois bielles 51 dont une Beule est repr6sentee ä la fig. 5, ä partir du, croisillon 43, les bielles 42 et 51 supportant respectivement 1'enveloppe et 1e conduit distributeur de combustible de fagon ä assurer une compensation de 1'expan- sion due aux variations de temp6rature. In the second embodiment of the device represented in FIGS. 5 and 6, the annular shell of the evaporator is suspended within the conduit through which the oxidizer passes by three forked links 42 which extend from a three-arm spider 43, the outer ends arms of this spider having larger diameter stems 45 provided with threaded extensions which extend through bosses 47 provided on the outside of the conduit for the oxidizer and which are fixed by means of nuts 48. A fuel distributor duct 35 is similarly supported by three connecting rods 51, one of which is shown in FIG. 5, from the spider 43, the connecting rods 42 and 51 respectively support the casing and the fuel distributor duct so as to provide compensation for the expansion due to temperature variations.

Le conduit distributeur de combustible pr6- sente deux rangfies de trous 35b et 35c respec- tivement orient6s de faron ä gicler du combus- tible dans des canaux de guidage ä extr6mite ouverte 49a et 49b disposds sur les surfaces radialement intdrieure et exterieure de 1'enve- loppe 31, ä 1'extrdmite amont de celle-ci. De la Borte, 1e combustible est obligd de s'6couler 1e Jong des surfaces extdrieures de 1'enveloppe. The fuel distributor duct has two rows of holes 35b and 35c respectively oriented to squirt fuel into open-ended guide channels 49a and 49b disposed on the radially inner and outer surfaces of the casing. - lope 31, at the upstream end thereof. De la Borte, the fuel is forced to flow 1e Jong from the outer surfaces of the casing.

En outre, cette deuxieme forme d'ex6cution comprend plusieurs tuyaux 52, en forme de L, destin6s ä foumir de 1'oxydant ä partir du cou- rant d'oxydant jusqu'ä l'int6rieur de 1'envelop- pe 31. L'une des branches de chacun de ces tuyaux s'6tend radialement ä travers. la paroi radialement int6rieure de 1'enveloppe 31 jus- qu'au-delä de la zone de vapeur entourant cette enveloppe et 1'extr6mite ouverte 53 de ce tuyau est taill6e en biseau de fagon ä diriger un cou- raut d'oxydant Beul ä l'int6rieur du tuyau. Further, this second embodiment includes several L-shaped pipes 52 for supplying oxidant from the oxidant stream to the interior of shell 31. one of the branches of each of these pipes extends radially therethrough. the radially inner wall of the casing 31 up to beyond the vapor zone surrounding this casing and the open end 53 of this pipe is bevelled so as to direct a flow of oxidant Beul to inside the pipe.

La fig. 7RTI ID="0003.0271" WI="16" HE="4" LX="1271" LY="613"> represente une troisieme forme d'exdcution comprenant un dvaporateur pre- sentant une paire d'enveloppes annulaires co- axialement dispos6es 31a et 31b. Ces enve- loppes communiquent entre elles ä travers au moins un tuyau de communication radial 54. Ce dispositif comprend un conduit distributeur de combustible 35 dispos6 de maniere ä se trouver entre les extr6mit6s amont ferm6es des deux enveloppes, pour fournir du combustible de maniere que celui-ci s'dcoule umquement sur les surfaces extdrieures adjacentes de ces enveloppes. Un jeu annulaire 55 subsiste entre les extr6mit6s aval respectives des deux enve- loppes 31a et 31b et 1e combustible evapore et m61ang6 ä de 1'oxydant peut passer ä travers ce jeu pour eire partiellement induit ä p6n6- trer dans les deux enveloppes. Une rang6e cir- culaire de tuyaux 52 en forme de L s'6tend ä travers chacune des parois les plus dloign6es Tune de 1'autre des deux enveloppes, et des tuyaux d'alimentation en combustible 56 dd- bouchent dans les extrdmitds d'admission pour de 1'oxydant 53 de ces tuyaux 52. Cette forme d'ex6cution prdsente une chambre de combus- tion de sectiön annulaire d61imit6e dune Part par des anneaux exterieurs se recouvrant 1'un 1'autre 57 ä 61 et, d'autre part, par des an- neaux intdrieurs se recouvrant 1'un 1'autre 62 ä 66. Les anneaux 57 et 62 sont montds ra- dialement ä distance des extrdmit6s aval des enveloppes 31a et 31b du dispositif, de fagon ä laisser p6n6trer de 1'oxydant, et des quantit6s suppldmentaires d'oxydant penetrent dans la chambre de combustion ä travers des jeux ana- logues m6nages entre les autres anneaux et ä travers des ouvertures ss7 et 68 m6nag6es Jans certains de ces anneaux. Le signe de r6f6- rence 22a d6signe une paroi qui, conjointe- ment avec la paroi 22, d6finit un conduit de section annulaire ä travers lequel passe un cou- rant d'oxydant et dans lequel les enveloppes de F6vaporateur et la chambre de combustion sont coaxialement dispos6es. Pour 1e demarrage, 1e dispositif comprend des moyens indiques en 69 pour fournir un jet de combustible ä l'int6rieur de Fune 31a des enveloppes, et un appareil d'allumage 70. fig. 7RTI ID="0003.0271" WI="16" HE="4" LX="1271" LY="613"> represents a third form of execution comprising an evaporator having a pair of coaxially disposed annular envelopes 31a and 31b. These envelopes communicate with each other through at least one radial communication pipe 54. This device comprises a fuel distributor conduit 35 arranged so as to be between the closed upstream ends of the two envelopes, -it flows only on the adjacent outer surfaces of these envelopes. An annular clearance 55 remains between the respective downstream ends of the two casings 31a and 31b and the fuel evaporated and mixed with oxidant can pass through this clearance to be partially induced to enter the two casings. A circular row of L-shaped pipes 52 extends through each of the farthest walls from one another of the two shells, and fuel supply pipes 56 open into the inlet ends. for the oxidant 53 of these pipes 52. This embodiment has a combustion chamber of annular section delimited on the one hand by outer rings overlapping one another 57 to 61 and, on the other hand , by mutually overlapping inner rings 62 to 66. oxidant, and additional amounts of oxidant enter the combustion chamber through similar clearances between the other rings and through openings ss7 and 68 in some of these rings. The reference sign 22a designates a wall which, together with the wall 22, defines a conduit of annular section through which a current of oxidant passes and in which the jackets of the evaporator and the combustion chamber are located. coaxially arranged. For starting, the device comprises means indicated at 69 for supplying a jet of fuel to the interior of one of the casings 31a, and an ignition device 70.

La fig. 8 reprdsente une quatrieme forme d'ex6cution comportant une chambre de com- bustion tubulaire disposde dann un conduit 71 et de1imitee par un>jeu d'anneaux sä recouvrant les uns les autres 72 ä.75 dispos6s de mani6re ä m6näger des jeux radiaux entre eux. L'extr6- mit6 amont ouverte de 1'anneau 72 et les jeux radiaux dopt il a 6t6 question ci-dessus laissent p6ndtrer dans la chambre de combustion de Fair fourni par un compresseur ä travers une ouverture amont 76,ä partir de 1'espace com- pris entre la paroi du conduit 71 et celle de la chambre de combustion formee par lesdits anneaux. Comme repr6sent6, Farmeau 75 est uruni de trous 75a au travers desquels des quantitds supp16mentaires d'air peuvent p6ne- trer ä Fintdrieur de la chambre de combustion et Fespace de section annulaire s'etend vers Faval entre la paroi du conduit 71 et Farmeau 75, pour refroidir ce dernier. fig. 8 shows a fourth embodiment comprising a tubular combustion chamber arranged in a duct 71 and delimited by a set of rings 72 to 75 overlapping each other arranged so as to form radial clearances between them . The open upstream end of the ring 72 and the radial clearances discussed above allow air supplied by a compressor to enter the combustion chamber through an upstream opening 76 from the space below. comprised between the wall of the duct 71 and that of the combustion chamber formed by said rings. As shown, pipe 75 is provided with holes 75a through which additional amounts of air can enter inside the combustion chamber and the annular section space extends downstream between the wall of pipe 71 and pipe 75. to cool it.

A Fint6rieur de Fanneau 72 et ä distance radiale de celui-ci se trouve 1'enveloppe 77 en forme de de de 1'dvaporateur. Des jets diver gente de combustible sont fournis Sur 1'extr6- mite amont fermee et de forme incurvee et convexe de cette enveloppe ä travers un con- duit 78. L'air p6n6trant par 1'extr6mit6 amont de 1'änneau 72 force ce combustible ä passer 1e long de la face ext6rieure du d6 et, comme an 1'a decrit precedemment en ref6rence aux dispo- sitifs du type annulaire, ce combustible est va- poris6 et une partie du m6lange de combustible et d'oxydant pdnetre dans 1e de 77 par 1'extrd- mit6 aval de celui-ci, comme indique par les fleches 26. Un tuyau 79 en forme de L s'dtend ä partir de Fespace annulaire et ä travers Fan- neau 72 et la paroi du d6 77, jusqu'ä Fintd- rieur de ce dernier, et un conduit 80 fournit du combustible ä l'int6rieur du tuyau 79, de fagon ä fournir un m61ange combustible ä 1'interieur du d6. Inside the ring 72 and at a radial distance therefrom is the d-shaped shroud 77 of the evaporator. Divergent jets of fuel are supplied to the closed, curved and convex upstream end of this shroud through a conduit 78. Air entering the upstream end of ring 72 forces this fuel to pass along the outer face of the die and, as previously described with reference to ring-type devices, this fuel is vaporized and some of the mixture of fuel and oxidant enters the die. 77 through the downstream end thereof, as indicated by arrows 26. An L-shaped pipe 79 extends from the annular space and through the ring 72 and the wall of the d6 77, to inside the latter, and a conduit 80 supplies fuel inside the pipe 79, so as to supply a combustible mixture inside the d6.

La fig. 9 reprdsente une cinquieme forme d'execution comprenant un dvaporateur prd- sentant une rang6e circulaire d'enveloppes 81 Sur les extremitds amont ferm6es, incurvdes et convexes desquelles du combustible est fourni ä partir d'un conduit distributeur 35. Ces en- veloppes communiquent les unes avec les au- tres ä travers des conduits 83 et un dispositif 84 est pr6vu pour RTI ID="0004.0271" WI="15" HE="4" LX="1437" LY="804"> entretenir et produire une flamme veilleuse. fig. 9 shows a fifth embodiment comprising a devaporator having a circular row of shrouds 81 on the closed, curved and convex upstream ends of which fuel is supplied from a distributor conduit 35. These shrouds communicate the with each other through conduits 83 and a device 84 is provided for RTI ID="0004.0271" WI="15" HE="4" LX="1437" LY="804"> night light.

Claims

CLAIM Combustion device using liquid fuel, comprising an evaporator for this fuel, this evaporator comprising at least one casing arranged with radial clearance inside (one conduit of the device intended to be traversed by a main stream of , device characterized in that said envelope (31 or 81) of the evaporator is closed at its upstream end and open at its downstream end, and in that it comprises means (35 or 78) for bringing liquid fuel to On the outer face of the casing, so that this fuel is swept along the outer surface of the casing by the main stream of oxidant passing through said conduit (22 or 24), the opening of the downstream end of the casing causing, under the action of the said main current passing beyond this open end, a depression inside the casing, and this depression attracting inside the casing a charge of fuel @ vapor and oxidant, so that this filler, shining inside the envelope, provides heat to evaporate the liquid fuel brought to the outer face of the envelope and maintains a stable flame zone from which the combustion of the rest of the fuel evaporates and of the oxidant arriving downstream of the casing is ensured. 1. Device according to claim, characterized in that said casing (31) is annular in shape and is arranged coaxially inside the conduit (22 or 24), this casing comprising an upstream end of form such that the liquid fuel supplied to this end is swept by the main stream along the radially inner and outer outer surfaces of said shroud.

2. Device according to claim, characterized in that said liquid fuel is supplied in the form of diverging jets (35b and 35c) on the upstream end of the casing, with the aim of facilitating the distribution of the fuel. on the outer surfaces of the casing.

3. Device according to claim .and sub-claim 1, characterized in that the casing (31) has at its upstream end and on its outer face guide channels with open ends (49a,</I). > 49b), the liquid fuel being supplied in said guide channels.

4. Device according to claim, characterized in that the evaporator comprises two coaxial annular casings (31a, 31b) par6es one of 1 ' another by an annular clearance, and in that said liquid fuel is provided on the outer surfaces of the adjacent walls of these envelopes.

5. Device according to claim, characterized in that the evaporator comprises several casings (81) arranged circumferentially at a distance from one another inside the duct (24), and in that said means (35, 35a) are arranged to supply said liquid fuel to the outer surface of the upstream end of each of these casings.

6. Device according to claim, characterized in that the open downstream end (25) of the shell of the evaporator is flared so as to reinforce the effect of induction of the load.

7. Device according to claim, characterized in that it is arranged so that an additional part of the oxidant is led from the conduit (22 or 24) to the interior of the casing (31, 31a, 31b) through a pipe (39, 52, 79 or 13.9) which extends into the interior of the casing, the part of this pipe which is inside of the casing having an outlet end oriented towards the closed upstream end of the casing, and the part of this pipe which is outside the casing having an inlet end oriented so as to collecting oxidant from the mainstream. TXF FR="5" WI="74"HE="27" LX="1062" LY="1410" SIZE="10" FONT="Times New Roman"> B. Device according to claim and sub-claim 7, characterized by a conduit for bringing an additional quantity of liquid fuel into the open end of said pipe which is outside the casing.