Combustion chamber with centrifugal ignition nozzle

Abstract

The invention discloses a combustion chamber with a centrifugal ignition nozzle, which comprises a casing shell, one end of the casing shell is provided with an air inlet convenient for introducing high-pressure air, the other end of the casing shell is connected with the tail end of a high-pressure turbine guider, and a flame tube is connected in the casing shell. The head end of the high-pressure turbine guider is arranged in the cartridge receiver shell and connected with the flame tube, an ignition nozzle extending into the flame tube is connected to the cartridge receiver shell and comprises a nozzle mounting seat fixedly connected to the outer side of the cartridge receiver shell, a nozzle rod is fixed to the nozzle mounting seat, one end of the nozzle rod is arranged outside the cartridge receiver shell, and the other end of the nozzle rod is connected with the flame tube. The other end of the nozzle rod extends into the cartridge receiver shell and is connected with the flame tube, the other end of the nozzle rod is connected with a nozzle head, fuel oil is sprayed out from an oil spraying hole of the nozzle head, and the end, away from the nozzle rod, of the nozzle head enters the flame tube; the atomization effect is good in the engine starting state, and the ignition performance of the engine in the starting state is improved.

Description

Technical Field

[0001] The invention relates to the technical field of aviation engines, in particular to a combustion chamber with a centrifugal ignition nozzle. Background Art

[0002] Wide-bounded, fast and reliable ignition performance is crucial for aircraft engines. The combustion chamber is one of the essential components of aircraft engines. Reliable ignition and starting, and flame stability in a wide range of operating conditions are the basic requirements for combustion chamber design. Especially when the engine is restarted at high altitude, the engine is in a windmill state, the air flow velocity at the compressor outlet is very fast, the external ambient temperature and pressure are low, and ignition is difficult. The performance of the engine's fast restart determines flight safety.

[0003] Baffled combustion chambers mostly use oil-slinging discs for fuel supply. The oil-slinging disc uses the centrifugal force generated by the high-speed rotation of the engine rotor to achieve fuel atomization. As the engine speed increases, the equivalent fuel supply pressure generated by the centrifugal force generated by its rotation also increases, and the atomization effect is also enhanced. In the combustion chamber that uses oil-slinging discs for fuel supply, the engine speed is high and the atomization effect of the oil-slinging disc is very good in the large state. However, in the engine starting state, the engine has only a few thousand speeds, the centrifugal force of the oil-slinging disc is very small, and the fuel sprayed from the oil-slinging disc cannot form small liquid droplets, and the atomization effect is poor, resulting in poor engine ignition performance, narrow ignition boundaries, and even ignition deflagration. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above problems and / or problems existing in existing engine combustion chambers, the present invention is proposed.

[0006] Therefore, an object of the present invention is to provide a combustion chamber with a centrifugal ignition nozzle, which has a good atomization effect in the engine starting state and improves the ignition performance in the engine starting state.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a combustion chamber with a centrifugal ignition nozzle, comprising a casing shell, one end of the casing shell is provided with an air inlet for conveniently introducing high-pressure air, the other end of the casing shell is connected to the end of a high-pressure turbine guide, a flame tube is connected inside the casing shell, the head end of the high-pressure turbine guide is inside the casing shell and connected to the flame tube, an ignition nozzle extending into the flame tube is connected to the casing shell, the ignition nozzle comprises a nozzle mounting seat fixedly connected to the outside of the casing shell, a nozzle rod is fixed on the nozzle mounting seat, one end of the nozzle rod is outside the casing shell, the other end of the nozzle rod extends into the casing shell and is connected to the flame tube, the other end of the nozzle rod is connected to a nozzle head, fuel is sprayed from the spray hole of the nozzle head, and the nozzle head enters the flame tube away from the end of the nozzle rod.

[0008] As a preferred solution of the combustion chamber with a centrifugal ignition nozzle in the present invention, a swirler is inserted in the nozzle head, one end of the nozzle head is the end where the oil injection hole is located, and the other end of the nozzle head is connected to the nozzle rod. A clamping spring is sleeved on the outer periphery of the swirler, and a pressure cap is just inserted in the nozzle head at the other end of the swirler. A clamping ring is clamped in the nozzle head at the end of the pressure cap away from the swirler. The clamping ring presses the pressure cap against the clamping spring, so that the clamping spring is in a compressed state, and the swirler is pressed against the inner side of one end of the nozzle head under the action of the clamping spring.

[0009] As a preferred solution of the combustion chamber with a centrifugal ignition nozzle in the present invention, the swirler on the outer periphery of the compression spring is also connected to an oil filter, and a plurality of filter holes are arranged on the oil filter. A flow gap is provided between the other end of the swirler and the gland, and an oil hole is provided at the center of the gland. After being filtered by the oil filter, the fuel is sprayed into the flame tube in sequence along the flow channel and the oil spray holes between the outer side of the swirler and the inner wall of the nozzle head.

[0010] As a preferred solution of the combustion chamber with a centrifugal ignition nozzle in the present invention, one end of the swirler has an oil outlet, and the swirler is pressed tightly on one end of the nozzle head to arrange a plurality of swirl grooves, the inner side of the swirl groove is connected to the oil outlet, and the outer side of the swirl groove is connected to the flow channel.

[0011] As a preferred solution of the combustion chamber with a centrifugal ignition nozzle in the present invention, the fuel injection hole includes a first fuel injection section, an intermediate transition section and a second fuel injection section arranged in sequence from the inside to the outside, the first fuel injection section gradually decreases in outer diameter from the inside to the outside, the intermediate transition section remains unchanged in outer diameter from the inside to the outside, and the second fuel injection section gradually increases in outer diameter from the inside to the outside.

[0012] As a preferred solution of the combustion chamber with a centrifugal ignition nozzle in the present invention, wherein: a radial diffuser is provided on the casing outer shell near the air inlet along the radial direction of the casing outer shell, an axial diffuser is fixedly connected to the inner side of one end of the casing outer shell in the axial direction, the casing outer shell in the inward direction of the axial diffuser is fixedly connected to one end of the casing connecting shell, and the other end of the casing connecting shell is fixedly connected to the casing inner shell.

[0013] As a preferred embodiment of the combustion chamber with a centrifugal ignition nozzle in the present invention, the flame tube includes a first flame tube body and a second flame tube body which are spaced apart in the axial direction and are both made of composite materials, the first flame tube body is arranged close to the casing inner shell, and the second flame tube body is arranged away from the casing inner shell, a main combustion hole and a mixing hole are opened on the first flame tube body, the main combustion hole is arranged close to the axial diffuser, and the mixing hole is arranged close to the casing inner shell, the outer rings of the first flame tube body and the second flame tube body are both floatingly connected to the head end of the high-pressure turbine guide, the inner rings of the first flame tube body and the second flame tube body are both floatingly connected to the outer ring of the casing inner shell, and a ventilation flow channel is formed between the outer periphery of the first flame tube body, the periphery of the second flame tube body, the inner ring of the axial diffuser, the outer periphery of the casing connecting shell and the outer side of the casing inner shell.

[0014] As a preferred solution of the combustion chamber with a centrifugal ignition nozzle in the present invention, the outer connecting ring and the inner connecting ring in the outer connecting ring are fixed on the side of the high-pressure turbine hollow guide relative to the flame tube, the inner ring of the first flame tube body is fixedly connected with a first positioning ring, a plurality of first positioning bosses are arranged on the inner side of the first positioning ring, a plurality of first grooves corresponding to the first positioning bosses are arranged on the outer periphery of the casing inner shell, the first positioning ring is engaged in the first groove via the first positioning boss, the inner end of the outer connecting ring in the axial direction is provided with an annular groove, the outer connecting ring is sleeved on the end of the first flame tube body via the annular groove, the end of the outer end of the first flame tube body is fixed with a first limiting boss, the outer connecting ring is also provided with a first groove corresponding to the first limiting boss, the outer connecting ring is sleeved on the first limiting boss via the first groove, and after the first flame tube body is rotated to dislocate the first positioning boss and the first groove, the high-pressure turbine guide is fixedly connected to the casing outer shell and the end of the casing inner shell.

[0015] As a preferred solution of the combustion chamber with a centrifugal ignition nozzle in the present invention, wherein: the head end of the second flame tube body is fixedly connected to a second locating ring, a plurality of second locating bosses are arranged on the inner side of the second locating ring, a plurality of second grooves corresponding to the second locating bosses are arranged on the outer periphery of the casing inner shell, and a plurality of second through grooves that allow the second locating bosses to pass through are arranged on the outer periphery of the casing inner shell at both ends in the axial direction of the second groove, and the second locating bosses are engaged in the second grooves after passing through the second through grooves, and a damping member is fixedly connected to the end of the outer ring of the second flame tube body Ring, a snap-in groove is opened at one end of the damping ring relative to the high-pressure turbine guide, a supporting ring is fixed on the damping ring on the inner side of the snap-in groove, an annular plug-in groove is opened at one end of the inner connecting ring relative to the damping ring, the inner connecting ring is supported on the supporting ring through the plug-in groove, a second snap-in groove is opened on the inner connecting ring on the outer circle of the plug-in groove, a second limiting boss is fixed on the outer side of the support ring, and the inner connecting ring is snapped on the second limiting boss through the second snap-in groove; after the second flame tube body is rotated to misalign the second positioning boss and the second tube groove, the high-pressure turbine guide is fixedly connected to the end of the casing outer shell and the casing inner shell.

[0016] Compared with the prior art, the present invention has the following technical effects: 1. The ignition nozzle in the present invention is a small flow centrifugal nozzle. The fuel rotates at a high speed in the nozzle head, and the fuel is dispersed into tiny beads by the action of centrifugal force. The ignition nozzle obtains a good atomization effect when it is started, that is, it is put into work, thereby improving the ignition performance of the engine; 2. The flame tube in the present invention is made of a ceramic-based composite material. The flame tube and the high-temperature turbine guide and casing inner shell made of a high-temperature alloy material are connected in a floating manner. The flame tube has a certain amount of free space in the axial, radial and circumferential directions to prevent the flame tube from being damaged due to a rigid connection between the flame tube and the metal material component. In addition, the linear expansion coefficient between the ceramic-based composite material and the high-temperature alloy component is very different. Due to the change in temperature, a large thermal stress will be generated at the interface of the two materials. The present application adopts a floating connection method to solve the problem of thermal expansion mismatch between the ceramic-based composite material and the metal material. 3. The weight of the flame tube in the present invention is significantly less than that of the flame tube made of metal material in the prior art, which has a significant effect on reducing the weight of the engine combustion chamber, is beneficial to improving engine performance, and improves the engine thrust-to-weight ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them: Figure 1 It is a schematic diagram of the internal structure of the present invention.

[0018] Figure 2 It is a structural diagram of the ignition nozzle in the present invention.

[0019] Figure 3 It is a structural diagram of the interior of the nozzle head in the present invention.

[0020] Figure 4 It is a three-dimensional structural diagram of the nozzle head in the present invention.

[0021] Figure 5 It is a three-dimensional structural diagram of the cyclone in the present invention.

[0022] Figure 6 It is a schematic diagram of the flow direction of fuel entering the nozzle head in the present invention.

[0023] Figure 7 It is a side view of the first locating ring and the inner shell of the receiver when they are concave and convexly matched.

[0024] Figure 8 A partial structural diagram of the first locating ring and the first flame tube body connected together and installed on the inner shell of the casing.

[0025] Fig. 9 It is a partial structural diagram of the first limiting boss in the first clamping groove of the outer connecting ring.

[0026] Fig.10 A partial structural diagram of the second positioning ring and the second flame tube body connected together being installed on the inner shell of the casing.

[0027] Fig.11 This is the structural diagram of the damping ring.

[0028] Fig.12 It is a partial structural diagram of the second limiting boss in the second groove of the inner connecting ring.

[0029] Fig.13 It is a side view of the concave-convex fit between the second locating ring and the inner shell of the receiver.

[0030] In the figure: 100 casing inner shell, 101 first through groove, 102 first groove, 103 second groove, 104 second through groove, 200 flame tube, 201 second flame tube body, 202 second positioning ring, 202a second positioning boss, 203 first positioning ring, 203a first positioning boss, 204 first flame tube body, 204a mixing hole, 204b main combustion hole, 204c first limiting boss, 205 damping ring, 205a clamping sink groove, 205b support ring, 205c second limiting boss, 300 casing connecting shell, 400 casing outer shell, 401 air inlet, 500 radial diffuser, 600 axial diffuser, 700 ignition nozzle, 701 elbow nozzle, 702 nozzle Nozzle mounting seat, 703 nozzle rod, 704 nozzle head, 704a injection hole, 704a-1 first injection section, 704a-2 middle transition section, 704a-3 second injection section, 704b slot, 705 gland, 706 compression spring, 707 oil filter, 707a filter hole, 708 cyclone, 708a oil outlet, 708b swirl groove, 709 clamping ring, 800 high-pressure turbine guide, 801 outer connecting ring, 801a ring groove, 801b first slot, 802 air outlet, 803 inner connecting ring, 803a plug-in sink, 803b second slot, M first gap, N second gap, J third gap, X fourth gap, P fifth gap, S sixth gap, R swirl chamber. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0034] Example 1 Reference Figure 1 to Figure 6 , which is the first embodiment of the present invention, provides a combustion chamber with a centrifugal ignition nozzle, which can improve the ignition performance of the engine.

[0035] A combustion chamber with a centrifugal ignition nozzle comprises an annular casing shell 400, one end of which is provided with an air inlet 401 for conveniently introducing high-pressure air, a radial diffuser 500 arranged along the radial direction of the casing shell 400 is provided on the casing shell 400 near the air inlet 401, an axial diffuser 600 is fixedly connected to the inner side of one end of the casing shell 400 in the axial direction, the casing shell 400 in the inward direction of the axial diffuser 600 is fixedly connected to one end of the casing connecting shell 300, the other end of the casing connecting shell 300 is fixedly connected to the casing inner shell 100, the other end of the casing shell 400 is connected to the end of a high-pressure turbine guide 800, the high-pressure turbine guide 800 is provided with an air outlet 802, and a flame tube 2 is connected inside the casing shell 400. 00, the head end of the high-pressure turbine guide vane 800 is in the casing shell 400 and connected to the flame tube 200, the casing shell 400 is connected to an ignition nozzle 700 extending into the flame tube 200, the ignition nozzle 700 includes a nozzle mounting seat 702 fixedly connected to the outside of the casing shell 400, a nozzle rod 703 is fixed to the nozzle mounting seat 702, one end of the nozzle rod 703 is outside the casing shell 400, one end of the nozzle rod 703 is connected to an elbow nozzle 701 for convenient fuel introduction, the other end of the nozzle rod 703 extends into the casing shell 400 and is connected to the flame tube 200, the other end of the nozzle rod 703 is connected to a nozzle head 704, the fuel is sprayed from the spray hole 704a of the nozzle head 704, and the end of the nozzle head 704 away from the nozzle rod 703 enters the flame tube 200.

[0036] The casing outer shell 400, casing inner shell 100, casing connecting shell 300, axial diffuser 600 and flame tube 200 in the present application are all annular components, and only half of them are drawn in the present application; the elbow nozzle 701 is connected to the external oil supply pipeline, which is used to provide fuel for the ignition nozzle 700; the nozzle mounting seat 702 is fixedly connected to the casing outer shell 400 by bolts; a nozzle hole is opened at the end of the flame tube 200, and the nozzle head 704 just enters the flame tube 200 through the nozzle hole; the high-pressure air entering the combustion chamber enters the flame tube 200 after deceleration and diffusion by the radial diffuser 500 and the axial diffuser 600, and at the same time, the fuel is sprayed into the flame tube 200 through the nozzle head 704, and the fuel is atomized and evaporated and mixed with the air, and the electric spark of the ignition nozzle ignites the combustible micro-groups mixed with the ignition nozzle 700 and ignites the entire combustion chamber.

[0037] Specifically, a swirler 708 is inserted into the nozzle head 704, one end of the nozzle head 704 is the end where the oil injection hole 704a is located, and the other end of the nozzle head 704 is connected to the nozzle rod 703. A compression spring 706 is sleeved on the outer periphery of the swirler 708, and a pressure cap 705 is just inserted into the nozzle head 704 at the other end of the swirler 708. The nozzle head 704 at the end of the pressure cap 705 away from the swirler 708 is provided with an annular groove 704b, and the nozzle head 704 is clamped with a clamping ring 709 through the clamping groove 704b, and the clamping ring 709 has a convenient clamping groove 704b. The clamping ring 709 presses the gland 705 against the compression spring 706, so that the compression spring 706 is in a compressed state. The cyclone 708 is pressed against the inner side of one end of the nozzle head 704 under the action of the compression spring 706. The cyclone 708 on the outer periphery of the compression spring 706 is also connected to an oil filter 707, and a plurality of filter holes 707a are arranged on the oil filter 707. There is a flow gap between the other end of the cyclone 708 and the gland 705. An oil through hole is opened in the center of the gland 705. After being filtered by the oil filter 707, the fuel flows along the outer side of the cyclone 708 and the nozzle head in sequence. The flow channel between the inner wall of 704 and the injection hole 704a is sprayed into the flame tube 200. One end of the swirler 708 has an oil outlet 708a. The swirler 708 is pressed against one end of the nozzle head 704 and is arranged with a plurality of swirl grooves 708b. The inner side of the swirl groove 708b is connected to the oil outlet 708a, and the outer side of the swirl groove 708b is connected to the flow channel. The injection hole 704a includes a first injection section 704a-1, an intermediate transition section 704a2 and a second injection section 704a-3 which are arranged in sequence from the inside to the outside. The first injection section 704a-1 is arranged from the inside to the outside. The outer diameter gradually decreases, the outer diameter of the middle transition section 704a-2 remains unchanged from the inside to the outside, and the outer diameter of the second injection section 704a-3 gradually increases from the inside to the outside. The first injection section 704a-1 is used to guide the high-pressure fuel into the middle transition section 704a-2. The fuel is ejected through the middle transition section 704a-2 (also called the nozzle) under pressure, forming a hollow cone in the middle transition section 704a-2. When the high-pressure fuel is ejected, the pressure energy is converted into kinetic energy, and is guided by the second injection section 704a-3 and injected into the air at high speed, interacting with the air to produce tiny oil droplets.

[0038] When installing the various components inside the nozzle head 704, first install the cyclone 708 into the nozzle head 704, one end of the cyclone 708 contacts the nozzle head 704 inside the first injection section 704a-1, the compression spring 706 is sleeved onto the cyclone 708, the oil filter 707 is just sleeved onto the cyclone 708, the pressure cover 705 is installed, the compression spring 706 is compressed, and the clamping ring 709 is clamped, and the clamping ring 709 presses the pressure cover 705 onto the cyclone 708. At the other end, the cyclone 708 is pressed against the nozzle head 704; the fuel entering the nozzle rod 703 enters from the oil hole of the gland 705, passes through the compression spring 706 and the oil filter 707, and filters out impurities through the filter hole 707a to prevent impurities from entering the flow channel and clogging the cyclone groove 708b and the injection hole 704a. The fuel filtered by the oil filter 707 enters the flow channel, flows through the cyclone groove 708b, and is sprayed out from the injection hole 704a (such as Figure 6 As shown in the figure, the ignition nozzle in the present invention is a small flow centrifugal nozzle. The fuel rotates at a high speed in the swirl chamber R formed between the outer periphery of one end of the swirler 708 and the inner side of the nozzle head 704. The fuel sprayed out by the centrifugal force is dispersed into tiny beads. The ignition nozzle 700 obtains a good atomization effect when it is started, that is, it is put into operation, thereby improving the ignition performance of the engine.

[0039] Example 2 Reference Figure 1 , Figure 7 to Figure 13 This embodiment provides a combustion chamber with a centrifugal ignition nozzle, which is different from Embodiment 1 in that it can further reduce the weight of the present invention.

[0040] Specifically, the flame tube 200 is made of a ceramic matrix composite material, and the flame tube 200 includes a first flame tube body 204 and a second flame tube body 201 which are spaced apart in the axial direction, the first flame tube body 204 is arranged close to the casing inner shell 100, and the second flame tube body 201 is arranged away from the casing inner shell 100, and the first flame tube body 204 is provided with a main combustion hole 204b and a mixing hole 204a, the main combustion hole 204b is arranged close to the axial diffuser 600, and the mixing hole 204a is arranged close to the axial diffuser 600. Arranged close to the casing inner shell 100, the outer circles of the first flame tube body 204 and the second flame tube body 201 are both floatingly connected to the head end of the high-pressure turbine guide vane 800, and the inner circles of the first flame tube body 204 and the second flame tube body 201 are both floatingly connected to the outer circle of the casing inner shell 100, and an air flow passage is formed between the outer periphery of the first flame tube body 204, the outer periphery of the second flame tube body 201, the inner circle of the axial diffuser 600, the outer periphery of the casing connecting shell 300 and the outer side of the casing inner shell 100.

[0041] A floating connection is adopted between the flame tube 200 and the components made of metal materials, namely, the casing outer shell 400, the casing inner shell 100 and the high-pressure turbine guide vane 800. A certain expansion gap is reserved between the flame tube 200 and the metal material components so that the flame tube 200 has a certain free space in all directions, thereby achieving coordination of the cold and hot dimensions between the flame tube 200 made of ceramic-based composite materials and the corresponding metal material components, and preventing the flame tube 200 from being damaged.

[0042] Specifically, an outer connecting ring 801 and an inner connecting ring 803 in the outer connecting ring 801 are fixed on one side of the high-pressure turbine hollow guide device relative to the flame tube 200. The outer connecting ring 801 is fixedly connected to the casing outer shell 400, and the inner connecting ring 803 is fixedly connected to the casing inner shell 100. The inner connecting ring 803 and the outer connecting ring 801 are both provided with a hollow guide groove just for the nozzle rod 703 to pass through. The inner ring of the first flame tube body 204 is fixedly connected to the first positioning ring 203, a plurality of first positioning bosses 203a are arranged on the inner side of the first positioning ring 203, a plurality of first grooves 102 corresponding to the first positioning bosses 203a are arranged on the outer periphery of the inner shell 100 of the casing, a plurality of first through grooves 101 through which the first positioning bosses 203a can pass are arranged on the outer periphery of the inner ring of the casing at the end of the first grooves 102, the first positioning bosses 203a pass through the first through grooves 101 and are engaged in the first grooves 102, and the outer connecting ring 801 is axially The inner end of the first flame tube body 204 is provided with an annular groove 801a, and the outer connecting ring 801 is sleeved on the end of the first flame tube body 204 through the annular groove 801a. The end of the outer end of the first flame tube body 204 is fixed with a first limiting boss 204c. The outer connecting ring 801 is also provided with a first clamping groove 801b corresponding to the first limiting boss 204c. The outer connecting ring 801 is sleeved on the first limiting boss 204c through the first clamping groove 801b. The first flame tube body 204 is rotated to make the first After the positioning boss 203a and the first through groove 101 are misaligned, the high-pressure turbine guide 800 is fixedly connected to the ends of the casing outer shell 400 and the casing inner shell 100; there is a first gap M between the two ends of the first positioning boss 203a in the axial direction and the two ends of the first groove 102 in the axial direction, there is a second gap N between the end of the second flame tube body 201 and the annular groove 801a, and there is a third gap J between the first limiting boss 204c and the first slot 801b.

[0043] Specifically, a second positioning ring 202 is fixedly connected to the head end of the second flame tube body 201, and a plurality of second positioning bosses 202a are arranged inside the second positioning ring 202. A plurality of second grooves 103 corresponding to the second positioning bosses 202a are also arranged on the outer periphery of the casing inner shell 100. A plurality of second through grooves 104 that allow the second positioning bosses 202a to pass through are arranged on the outer periphery of the casing inner shell 100 at both ends in the axial direction of the second grooves 103. The second positioning bosses 202a are engaged in the second grooves 103 after passing through the second through grooves 104. A damping ring 205 is fixedly connected to the end of the outer ring of the second flame tube body 201. A clamping groove 205a is opened at one end of the damping ring 205 relative to the high-pressure turbine guide 800. A support ring 205b is fixed on the damping ring 205 inside the clamping groove 205a. The inner connecting ring 803 is opened at one end relative to the damping ring 205. There is an annular plug-in groove 803a, and the inner connecting ring 803 is supported on the support ring 205b through the plug-in groove 803a. A second clamping groove 803b704b is opened on the inner connecting ring 803 of the outer circle of the plug-in groove 803a, and a second limiting boss 205c is fixed on the outer side of the support ring 205b. The inner connecting ring 803 is clamped on the second limiting boss 205c through the second clamping groove 803b704b; after rotating the second flame tube body 201 to make the second positioning boss 202a and the second through groove 104 misaligned, the high-pressure turbine guide 800 is fixedly connected to the end of the casing outer shell 400 and the casing inner shell 100, and a fourth gap X is provided between the outer edge of the second positioning boss 202a and the second groove 103, a fifth gap P is provided between the support ring 205b and the plug-in groove 803a, and a sixth gap S is provided between the second limiting boss 205c and the second clamping groove 803b704b.

[0044] The first flame tube body 204 has gaps in the axial and circumferential directions at the connection part between the first positioning ring 203 and the casing inner shell 100, and the second flame tube body 201 has gaps in the axial and circumferential directions at the connection part between the second positioning ring 202 and the casing inner shell 100; the flame tube 200 has a certain amount of free space in the axial and circumferential directions, and the cold and hot dimensions between the wall of the ceramic-based composite flame tube 200 and the metal casing are coordinated to prevent the flame tube 200 from being damaged. When the engine is in working condition, the corresponding wall gaps of the front wall and the rear wall of the flame tube 200 in the axial and circumferential directions become smaller, which can reduce the leakage of the airflow in each flow channel.

[0045] The ends of the first flame tube body 204 and the second flame tube body 201 are overlapped with the outer connecting ring 801 and the inner connecting ring 803 respectively. Annular gaps are left in the connecting sections of the first flame tube body 204 and the second flame tube body 201 with the outer connecting ring 801 and the inner connecting ring 803 respectively. The reserved annular groove 801a gap can meet the space requirement for radial thermal expansion of the ceramic-based composite flame tube 200. At the same time, the annular groove 801a can also play a role in auxiliary support of the wall of the flame tube 200, which is very beneficial to the long-term, reliable and stable operation of the flame tube 200.

[0046] The direction in this application is based on the direction of the air inlet 401, and the direction of the gas from the air inlet to the air outlet 802 is from the beginning to the end. The beginning and end mentioned in this application are based on the above direction.

[0047] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the technical solutions of the present invention.

Claims

1. A combustion chamber with a centrifugal ignition nozzle, characterized in that: The invention comprises a casing shell (400), one end of which is provided with an air inlet for conveniently introducing high-pressure air, the other end of which is connected to the end of a high-pressure turbine guide (800), a flame tube (200) is connected inside the casing shell (400), the head end of the high-pressure turbine guide (800) is inside the casing shell (400) and connected to the flame tube (200), an ignition nozzle (700) extending into the flame tube (200) is connected to the casing shell (400), and the ignition nozzle (700) comprises a nozzle fixedly connected to the casing shell (400). A nozzle mounting seat (702) is disposed outside the casing shell (400), a nozzle rod (703) is fixed on the nozzle mounting seat (702), one end of the nozzle rod (703) is outside the casing shell (400), the other end of the nozzle rod (703) extends into the casing shell (400) and is connected to the flame tube (200), the other end of the nozzle rod (703) is connected to a nozzle head (704), fuel is sprayed out from a spray hole (704a) of the nozzle head (704), and the end of the nozzle head (704) away from the nozzle rod (703) enters the flame tube (200).

2. The combustion chamber with a centrifugal ignition nozzle according to claim 1, characterized in that: A swirler (708) is inserted into the nozzle head (704); one end of the nozzle head (704) is the end where the oil injection hole (704a) is located; the other end of the nozzle head (704) is connected to the nozzle rod (703); a compression spring (706) is sleeved on the outer periphery of the swirler (708); a pressure cap (705) is just inserted into the nozzle head (704) at the other end of the swirler (708); a clamping ring (709) is clamped into the nozzle head (704) at the end of the pressure cap (705) away from the swirler (708); the clamping ring (709) presses the pressure cap (705) against the compression spring (706), so that the compression spring (706) is in a compressed state; and the swirler (708) is compressed against the inner side of one end of the nozzle head (704) under the action of the compression spring (706).

3. The combustion chamber with a centrifugal ignition nozzle according to claim 2, characterized in that: The swirler (708) on the outer periphery of the compression spring (706) is also connected to an oil filter (707), and a plurality of filter holes (707a) are arranged on the oil filter (707). A flow gap is provided between the other end of the swirler (708) and the pressure cover (705), and an oil hole is provided at the center of the pressure cover (705). After being filtered by the oil filter (707), the fuel oil is sequentially sprayed into the flame tube (200) along the flow channel between the outer side of the swirler (708) and the inner wall of the nozzle head (704) and the oil spray hole (704a).

4. The combustion chamber with a centrifugal ignition nozzle according to claim 3, characterized in that: One end of the swirler (708) is provided with an oil outlet (708a); the swirler (708) is pressed against one end of the nozzle head (704) and is provided with a plurality of swirl grooves (708b); the inner side of the swirl groove (708b) is connected to the oil outlet (708a); and the outer side of the swirl groove (708b) is connected to the flow channel.

5. The combustion chamber with a centrifugal ignition nozzle according to any one of claims 1 to 4, characterized in that: The oil injection hole (704a) comprises a first oil injection section (704a-1), an intermediate transition section (704a-1) and a second oil injection section (704a-1) which are arranged in sequence from the inside to the outside. The outer diameter of the first oil injection section (704a-1) gradually decreases from the inside to the outside, the outer diameter of the intermediate transition section (704a-1) remains unchanged from the inside to the outside, and the outer diameter of the second oil injection section (704a-1) gradually increases from the inside to the outside.

6. A combustion chamber with a centrifugal ignition nozzle according to any one of claims 1 to 4, characterized in that: A radial diffuser (500) is provided on the casing outer shell (400) near the air inlet and is arranged along the radial direction of the casing outer shell (400); an axial diffuser (600) is fixedly connected to the inner side of one end of the casing outer shell (400) in the axial direction; the axial diffuser (600) is fixedly connected to one end of the casing connecting shell (300) in the inward direction of the casing outer shell (400); and the other end of the casing connecting shell (300) is fixedly connected to the casing inner shell (100).

7. The combustion chamber with a centrifugal ignition nozzle according to claim 6, characterized in that: The flame tube (200) comprises a first flame tube body (204) and a second flame tube body (200) which are arranged at intervals in the axial direction and are both made of composite materials. The first flame tube body (204) is arranged close to the casing inner shell (100), and the second flame tube body (200) is arranged away from the casing inner shell (100). The first flame tube body (204) is provided with a main combustion hole (204b) and a mixing hole (204a). The main combustion hole (204b) is arranged close to the axial diffuser (600), and the mixing hole (204a) is arranged close to the casing. The inner shell (100) is provided, the outer rings of the first flame tube body (204) and the second flame tube body (200) are both floatingly connected to the head end of the high-pressure turbine guide vane (800), the inner rings of the first flame tube body (204) and the second flame tube body (200) are both floatingly connected to the outer ring of the casing inner shell (100), and a flow passage is formed between the outer periphery of the first flame tube body (204), the outer periphery of the second flame tube body (200), the inner ring of the axial diffuser (600), the outer periphery of the casing connecting shell (300) and the outer side of the casing inner shell (100).

8. The combustion chamber with a centrifugal ignition nozzle according to claim 7, characterized in that: An outer connecting ring (801) and an inner connecting ring (803) inside the outer connecting ring (801) are fixedly provided on one side of the high-pressure turbine hollow guide device relative to the flame tube (200); a first positioning ring (203) is fixedly connected to the inner ring of the first flame tube body (204); a plurality of first positioning bosses (203a) are arranged inside the first positioning ring (203); a plurality of first grooves (102) corresponding to the first positioning bosses (203a) are arranged on the outer periphery of the casing inner shell (100); the first positioning ring (203) is engaged in the first groove (102) via the first positioning bosses (203a); and an annular groove (801a) is provided at the inner end of the outer connecting ring (801) in the axial direction. ), the outer connecting ring (801) is sleeved on the end of the first flame tube body (204) through the ring groove (801a), the end of the outer end of the first flame tube body (204) is fixed with a first limiting boss (204c), the outer connecting ring (801) is also provided with a first clamping groove (801b) corresponding to the first limiting boss (204c), the outer connecting ring (801) is sleeved on the first limiting boss (204c) through the first clamping groove (801b), the first flame tube body (204) is rotated to make the first positioning boss (203a) and the first groove (102) misaligned, and the high-pressure turbine guide (800) is fixedly connected to the ends of the casing outer shell (400) and the casing inner shell (100).

9. The combustion chamber with a centrifugal ignition nozzle according to claim 7, characterized in that: A second positioning ring (202) is fixedly connected to the head end of the second flame tube (200) body, and a plurality of second positioning bosses (202a) are arranged inside the second positioning ring (202). A plurality of second grooves (103) corresponding to the second positioning bosses (202a) are arranged on the outer periphery of the casing inner shell (100). A plurality of second through grooves (104) that allow the second positioning bosses (202a) to pass through are arranged on the outer periphery of the casing inner shell (100) at both ends in the axial direction of the second grooves (103). After the second positioning bosses (202a) pass through the second through grooves (104), they are engaged in the second grooves (103). A damping ring (205) is fixedly connected to the end of the outer ring of the second flame tube (200) body, and a snap-in recessed groove (205a) is provided at one end of the damping ring (205) relative to the high-pressure turbine guide vane (800). A support ring (205b) is fixed on the damping ring (205) on the inner side thereof; an annular plug-in recess (803a) is formed on one end of the inner connecting ring (803) opposite to the damping ring (205); the inner connecting ring (803) is supported on the support ring (205b) via the plug-in recess (803a); a second slot (803b) (704b) is formed on the inner connecting ring (803) on the outer ring of the plug-in recess (803a); A second limiting boss (205c) is fixed on the outer side of (205b), and the inner connecting ring (803) is clamped on the second limiting boss (205c) through the second clamping groove (803b) (704b); after the second flame tube (200) body is rotated to misalign the second positioning boss (202a) and the second tube groove, the high-pressure turbine guide (800) is fixedly connected to the ends of the casing outer shell (400) and the casing inner shell (100).

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