Combustion chamber, gas turbine engine, fuel supply system and method

Abstract

The invention provides a combustion chamber, a gas turbine engine, a fuel supply system and a fuel supply method. The fuel supply system comprises a plurality of fuel nozzles arranged corresponding to the head of the combustion chamber, and each fuel nozzle comprises a first oil way part, a second oil way part, a third oil way part, a fourth oil way part and a fifth oil way part, and the first oil way part comprises a first oil inlet connector and a first distribution valve located on the downstream of the first oil inlet connector; a first oil way extends from the first oil inlet connector to pass through the first distribution valve and then is divided into a pre-combustion-stage auxiliary oil way and a pre-combustion-stage main oil way which extend respectively, the pre-combustion-stage auxiliary oil way extends to a pre-combustion-stage auxiliary nozzle, and the pre-combustion-stage main oil way extends to a pre-combustion-stage main nozzle; and the second oil way part comprises a second oil inlet connector and a second distribution valve located on the downstream of the second oil inlet connector, and a second oil way extends from the second oil inlet connector, passes through the second distribution valve and then extends to the main combustion stage oil way to the main combustion stage nozzle.

Description

Technical Field

[0001] The present invention relates to the field of combustion chambers, and in particular to a combustion chamber, a gas turbine engine, a fuel supply system and a method. Background Art

[0002] As the atmospheric environment issues are increasingly valued by countries around the world, the requirements for pollutant emissions from aircraft engines are becoming more and more stringent. The market demand for the next generation of aircraft engine products shows that the emission of nitrogen oxides (NOx) will be further reduced by about 15% to 30% compared with the current International Civil Aviation Organization (ICAO) standard CAEP8. The use of a center-staged lean combustion chamber can effectively reduce NOx emissions. This center-staged combustion chamber has a multi-oil-path staged nozzle. For the three-oil-path staged nozzle, only the pre-combustion stage oil path 1 is supplied with oil in the ignition state, the pre-combustion stage auxiliary oil path and the pre-combustion stage main oil path are supplied with oil in the slow-speed, approaching and other states, and the pre-combustion stage auxiliary oil path, the pre-combustion stage main oil path and the main combustion stage oil path are supplied with oil at the same time in the large states such as climbing and taking off. Among them, the pre-combustion stage main oil circuit also plays a role in avoiding combustion oscillation. When the large-operating combustion chamber produces combustion oscillation, part of the fuel of the main combustion stage can be distributed to the pre-combustion stage main oil circuit through the fuel distributor to enhance the relatively stable diffusion flame combustion to weaken the combustion oscillation. Therefore, the flow rate of the pre-combustion stage main nozzle cannot be too small to avoid excessive pressure before the nozzle exceeding the limit capacity of the oil pump. For this three-oil circuit nozzle, due to the large flow rate of the pre-combustion stage main nozzle, the fuel flow is small under slow-running conditions, and the nozzle pressure drop is very small, resulting in poor atomization performance and low combustion efficiency. Summary of the invention

[0003] An object of the present invention is to provide a fuel supply system.

[0004] Another object of the present invention is to provide a combustion chamber.

[0005] Yet another object of the present invention is to provide a gas turbine engine.

[0006] Another object of the present invention is to provide a fuel supply method.

[0007] According to one aspect of the present invention, a fuel supply system includes a plurality of fuel nozzles arranged corresponding to the heads of combustion chambers, wherein each fuel nozzle includes: a first oil circuit portion, including: a first oil inlet joint, and a first distribution valve and a third distribution valve located downstream of the first oil inlet joint, the first oil circuit extends from the first oil inlet joint through the first distribution valve or the third distribution valve and is divided into a pre-combustion stage auxiliary oil circuit and a pre-combustion stage main oil circuit and extends separately, the pre-combustion stage auxiliary oil circuit extends to the pre-combustion stage auxiliary nozzle, the pre-combustion stage main oil circuit extends to the pre-combustion stage main nozzle, the pre-combustion stage auxiliary nozzle and the pre-combustion stage main nozzle provide diffusion combustion of the pre-combustion stage; a second oil circuit portion, including: a second oil inlet joint, and a second distribution valve located downstream of the second oil inlet joint, the second oil circuit extends from the second oil inlet joint through the second distribution valve and then becomes the main combustion stage oil circuit to the main combustion stage nozzle, providing premixed combustion of the main combustion stage.

[0008] In the fuel supply system of the technical solution of the present application, the first distribution valve is provided for part of the first oil circuit section, and the third distribution valve is provided for another part, so that different opening pressures are achieved for the main oil circuit of the pre-combustion stage. Under slow-running conditions, the fuel flow is small and the fuel pressure drop is low. The third distribution valve device closes the flow-type hole entering the main oil circuit of the pre-combustion stage, and the first distribution valve device opens the flow-type hole entering the main oil circuit of the pre-combustion stage, so that the main nozzles of the pre-combustion stage in the circumferential direction are opened, the atomization performance is improved, and the combustion efficiency is increased. Under conditions such as approach, the fuel flow increases and the fuel pressure drop increases. The first distribution valve and the third distribution valve simultaneously open the flow-type hole entering the main oil circuit of the pre-combustion stage, so that all the main nozzles of the pre-combustion stage in the circumferential direction are opened, so as to avoid excessive pressure on the nozzle inlet causing excessive burden on the oil pump.

[0009] A combustion chamber according to another aspect of the present invention comprises the fuel supply system as described above.

[0010] A gas turbine engine according to another aspect of the present invention comprises the combustion chamber as described above and a turbine located downstream thereof, wherein the high-temperature combustion gas generated in the combustion chamber drives the turbine to output power.

[0011] A fuel supply method according to yet another aspect of the present invention adopts the fuel supply system as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments. In the accompanying drawings, the same reference numerals always represent the same features. It should be noted that these drawings are only examples and are not drawn according to the conditions of equal scale, and should not be used as a limitation on the actual scope of protection required by the present invention, wherein:

[0013] Figure 1A schematic structural diagram of a gas turbine engine according to an embodiment;

[0014] Figure 2 A schematic structural diagram of a combustion chamber according to an embodiment;

[0015] Figure 3 A schematic structural diagram of a fuel nozzle of a fuel supply system according to an embodiment;

[0016] Figure 4 A schematic structural diagram of a fuel nozzle of a fuel supply system of an embodiment from another perspective;

[0017] Figure 5A , Figure 5B They are schematic structural diagrams of a first distribution valve and a third distribution valve of a fuel nozzle of a fuel supply system of an embodiment;

[0018] Figure 6 A schematic structural diagram of a second distribution valve of a fuel nozzle of a fuel supply system of an embodiment;

[0019] Figure 7 The present invention is a schematic block diagram of the structure of a fuel nozzle of a fuel supply system according to an embodiment of the present invention.

[0020] Some reference numerals:

[0021] 0Fan

[0022] 1 Compressor

[0023] 2 Combustion chamber

[0024] 3 Turbine

[0025] 21 Diffuser

[0026] 22 Combustion chamber head

[0027] 23 Flame Tube

[0028] 24 Combustion chamber casing

[0029] 25 fuel nozzle

[0030] 31 pre-combustion stage auxiliary nozzle

[0031] 32 pre-combustion stage main nozzle

[0032] 33 Main combustion stage nozzle

[0033] 41 pre-combustion stage auxiliary oil circuit

[0034] 42 pre-combustion stage main oil circuit

[0035] 43 Main fuel oil circuit

[0036] 51 first distribution valve

[0037] 52 Second distribution valve

[0038] 53 First oil inlet connector

[0039] 54 Second oil inlet connector

[0040] 61 end cap

[0041] 62 Spring

[0042] 63 piston parts

[0043] 631 bevel section

[0044] 64 cylinder parts

[0045] 640 Hollow Chamber

[0046] 641 First Channel

[0047] 642 Second Channel

[0048] 643 Opening

[0049] 65 Seals

[0050] 66 valve base

[0051] 661 Oil outlet chamber

[0052] 662 Oil outlet

[0053] 67 sleeve parts

[0054] 670 Holding Chamber

[0055] 671 Flow hole

[0056] 68 Radial clearance. DETAILED DESCRIPTION

[0057] Reference will now be made in detail to various embodiments of the present invention, examples of which are shown in the accompanying drawings and described below. Although the present invention will be described in conjunction with the exemplary embodiments, it should be appreciated that this specification is not intended to limit the present invention to those exemplary embodiments. On the contrary, the present invention is intended to cover not only these exemplary embodiments, but also various alternative forms, modifications, equivalent forms and other embodiments that may be included within the spirit and scope of the present invention as defined by the appended claims.

[0058] In the following description, the orientation or positional relationship indicated by "upstream", "downstream" or other directional terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0059] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment" and / or "an embodiment" means a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0060] At present, with the increasing requirements on combustion chamber performance, the fuel supply system needs to be further improved.

[0061] In order to avoid large-scale combustion oscillations in existing three-oil-circuit fuel nozzles, part of the fuel in the main combustion stage can be distributed to the pre-combustion stage main oil circuit through the fuel distributor to enhance the relatively stable diffusion flame combustion and reduce combustion oscillations. Therefore, the flow rate of the pre-combustion stage main nozzle must not be too small to avoid excessive pressure in front of the nozzle exceeding the limit capacity of the oil pump. For this type of three-oil-circuit nozzle, since the flow rate of the pre-combustion stage main nozzle is large, the fuel flow rate is small under slow-running conditions, the pre-combustion stage main oil circuits of all nozzles are open, and the nozzle pressure drop is very small, resulting in poor atomization performance and low combustion efficiency.

[0062] Based on the above considerations, the inventor has conducted in-depth research and designed a fuel supply system. By setting a first distribution valve on part of the first oil circuit and a third distribution valve on the other part, different opening pressures are achieved for the main oil circuit of the pre-combustion stage. Under slow-running conditions, the fuel flow is small and the fuel pressure drop is low. The third distribution valve device closes the flow-type hole entering the main oil circuit of the pre-combustion stage, and the first distribution valve device opens the flow-type hole entering the main oil circuit of the pre-combustion stage, so as to open the main nozzle of the pre-combustion stage in the circumferential direction, improve the atomization performance, and improve the combustion efficiency. Under conditions such as approach, the fuel flow increases and the fuel pressure drop increases. The first distribution valve and the third distribution valve simultaneously open the flow-type hole entering the main oil circuit of the pre-combustion stage, so as to open all the main nozzles of the pre-combustion stage in the circumferential direction, and avoid excessive pressure on the nozzle inlet, which may cause excessive burden on the oil pump.

[0063] Although the fuel supply system disclosed in the embodiment of the present application is applicable to aircraft engines, it is not limited thereto and can also be applied to scenarios such as ground gas turbines.

[0064] like Figure 1As shown, a gas turbine engine, such as a turbofan engine, includes components such as a compressor 1, a combustion chamber 2 and a turbine 3. The compressor 1 compresses air and burns it in the combustion chamber 2, and then works on the turbine 3, converting the chemical energy of the fuel into mechanical energy of the turbine. The turbine discharges the fuel gas and drives the fan 0 to generate thrust.

[0065] like Figure 2 As shown, in some embodiments, the combustion chamber 2 includes a diffuser 21, a combustion chamber head 22, a flame tube 23, a combustion chamber casing 24 and a fuel nozzle 25. The compressed air flow of the compressor 1 is decelerated and diffused through the diffuser 21, and then enters the combustion chamber head 22 and the flame tube 23, where it is mixed with the fuel sprayed from the fuel nozzle 25 and then burns. The combustion chamber casing 24 is wrapped around the outside of the flame tube and connected to the front and rear compressors 1 and turbine 3. In some embodiments, the combustion chamber heads 22 are evenly arranged along the circumferential direction of the single-ring cavity structure of the combustion chamber 2. In some embodiments, the number of the combustion chamber heads 22 is 15 to 30. The combustion chamber head 22 adopts a central graded structure. The number of fuel nozzles 25 is the same as the number of the combustion chamber heads 22.

[0066] refer to Figures 3 to 7 As shown, in some embodiments, the fuel supply system 100 may include a fuel tank, a fuel pump, a fuel distributor, and a fuel nozzle. The fuel is pumped from the fuel tank to the fuel distributor by the fuel pump, and distributed to the first fuel path and the second fuel path through the fuel distributor, that is, delivered to the first fuel inlet connector 53 and the second fuel inlet connector 54 of the fuel nozzle 25.

[0067] refer to Figures 3 to 6 As shown, in some embodiments, the fuel nozzle 25 of the fuel supply system 100 is a three-oil-path nozzle, including a first oil-path portion and a second oil-path portion. The first oil-path portion includes: a first oil inlet joint 53, and a first distribution valve 51 or a third distribution valve 511 located downstream of the first oil inlet joint 53. The first oil path extends from the first oil inlet joint 53 through the first distribution valve 51 and is divided into a pre-combustion stage auxiliary oil path 41 and a pre-combustion stage main oil path 42, respectively. The pre-combustion stage auxiliary oil path 41 extends to the pre-combustion stage auxiliary nozzle 31, and the pre-combustion stage main oil path 42 extends to the pre-combustion stage main nozzle 32. The pre-combustion stage auxiliary nozzle 31 and the pre-combustion stage main nozzle 32 provide diffusion combustion of the pre-combustion stage. As for the number of the first distribution valve 51 and the third distribution valve 511, half of the fuel nozzles 25 may have the first distribution valve 51, and the other half of the fuel nozzles 25 may have the third distribution valve 511. In addition, the opening pressure of the first distribution valve 51 is less than that of the third distribution valve 511.

[0068] The second oil circuit portion includes: a second oil inlet connector 54, and a second distribution valve 52 located downstream of the second oil inlet connector 54. The second oil circuit extends from the second oil inlet connector 54 through the second distribution valve 52 to become the main combustion stage oil circuit 43, and extends to the main combustion stage nozzle 33 to provide premixed combustion for the main combustion stage.

[0069] For the working conditions of the gas turbine engine, for example, in the ignition condition, the fuel distributor supplies fuel to the first oil circuit portion, while the second oil circuit portion is closed, and the fuel enters the pre-combustion stage auxiliary oil circuit 41 through the first distribution valve 51, and the pre-combustion stage auxiliary nozzle 31 works. The flow rate of this nozzle is the smallest, which can ensure the atomization effect during ignition and ensure the ignition performance.

[0070] In the slow-running and approaching conditions, the fuel flow increases, and the fuel distributor supplies fuel to the first oil circuit section, while the second oil circuit section is closed. However, there is a difference between the two. In the slow-running condition, the first oil circuit section is opened and the second oil circuit section is closed. The flow path of the fuel is: after the fuel passes through the first distribution valve 51, it enters the pre-combustion stage auxiliary oil circuit 41 and the pre-combustion stage main oil circuit 42 respectively. After the fuel passes through the third distribution valve 511, it only enters the pre-combustion stage auxiliary oil circuit 41, that is, half of the nozzles assume that half of the fuel nozzles 25 have the first distribution valve 51, and the other half of the fuel nozzles 25 have the third distribution valve 511 to distribute the fuel into the pre-combustion stage auxiliary oil circuit 41 and the pre-combustion stage main oil circuit 42. In the approaching condition, the first oil circuit section is opened and the second oil circuit section is closed. The flow path of the fuel is: after the fuel passes through the first distribution valve 51 and the third distribution valve 511, it enters the pre-combustion stage auxiliary oil circuit 41 and the pre-combustion stage main oil circuit 42 respectively. The reason is that the oil pressure in the approach condition is slightly higher than that in the slow-running condition, so the first distribution valve 51 and the third distribution valve 511 can both be opened.

[0071] The fuel enters the pre-combustion stage auxiliary oil circuit 41 and the pre-combustion stage main oil circuit 42 through the first distribution valve 51 and the third distribution valve 511. The pre-combustion stage auxiliary nozzle 31 and the pre-combustion stage main nozzle 32 work at the same time, ensuring combustion efficiency while reducing the fuel pump supply pressure burden.

[0072] In the climbing and take-off conditions, the fuel distributor supplies fuel to the first oil circuit and the second oil circuit. The fuel of the first oil circuit enters the pre-combustion stage auxiliary oil circuit 41 and the pre-combustion stage main oil circuit 42 through the first distribution valve 51 and the third distribution valve 511. The fuel of the second oil circuit enters the main combustion stage oil circuit 43 through the second distribution valve 52. The pre-combustion stage auxiliary nozzle 31, the pre-combustion stage main nozzle 32 and the main combustion stage nozzle 33 work at the same time. The main combustion stage nozzle 33 has the largest flow rate. Most of the fuel can be distributed to the main combustion stage nozzle 33 through the fuel distributor. The main combustion stage fuel ratio is only controlled by the fuel distributor. The use of premixed combustion can effectively reduce emissions. And when oscillating combustion occurs, the fuel distributor can directly and accurately adjust the fuel distribution ratio of the main combustion stage nozzle to avoid oscillating combustion.

[0073] The fuel dispenser here, as the name implies, is a device for distributing fuel, which can be realized by components such as solenoid valves, electro-hydraulic servo valves, linear displacement sensors, etc. For example, it can be the fuel dispenser disclosed in the Chinese invention patent application document with Chinese patent publication number CN104696126A and the name "Fuel Dispenser and Engine Suitable for the Fuel Dispenser", but it is not limited to this.

[0074] refer to Figure 5A As shown, in some embodiments, the specific structure of the first distribution valve 51 may include: an end cover 61 , an elastic member 62 , a piston member 63 , a cylinder member 64 , a valve base 66 and a sleeve member 67 . The sleeve member 67 provides a accommodating chamber 670, and the side wall of the sleeve member 67 is provided with a flow hole 671 that penetrates the radial thickness of the side wall; one axial end of the piston member 63 can be rod-shaped and is arranged on the end cover 61, so that the piston member 63 and the end cover 61 can be displaced synchronously, and the elastic member 62 is connected to the end cover 61 at one end; the cylinder member 64 is a fixed member, and the end cover 61, the elastic member 62, the piston member 63 and the cylinder member 64 are located in the accommodating chamber 670, and the other end of the elastic member 62 is connected to the cylinder member 64; the cylinder member 64 provides a hollow chamber 640, and the side wall of the hollow chamber 640 includes a first channel 641, a second channel 642, and an opening 643 located at the bottom, the other axial end of the piston member 63 cooperates with the opening 643, and the other axial end of the piston member 63 has a chamfered portion 631, and there is a radial gap between the chamfered portion 631 and the inner wall of the hollow chamber 640. The flow direction of the fuel is shown by the arrow in the figure. The fuel can be opened or closed by the relative displacement of the piston member 63 in the axial direction to open or close the opening 643. The first channel 641 allows the fuel in the accommodating chamber 670 to enter the hollow chamber 640. The second channel 642 is arranged corresponding to the flow hole 671, so that the fuel can pass from the hollow chamber 640 through the second channel 642 and the flow hole 671 to the pre-combustion stage auxiliary oil circuit 41. Preferably, the area of ​​the cylinder member 64 corresponding to the second channel 642 is provided with a sealing member 65, such as an O-ring. The valve base 66 provides an oil outlet chamber 661 and an oil outlet 662, which are arranged corresponding to the opening 643. The piston member 63 is relatively displaced in the axial direction to open or close the opening 643, so that the fuel can pass through the radial gap between the inclined portion 631 and the inner wall of the hollow chamber 640 through the opening 643, the oil outlet chamber 661, and the oil outlet 662 to flow into the pre-combustion stage main oil circuit 42. The arrows in the figure indicate the direction of fuel flow, and it can be understood that the fuel flows through the sleeve member 67 into the cylinder member 64. One of the oil paths is to flow out of the first distribution valve through the second channel 642 and the flow hole 671, forming the pre-combustion stage auxiliary oil path 41. In addition, the pressure difference between the front and rear of the fuel pushes the piston member 63 to move downward, and the elastic member 62 is compressed.

[0075] When the oil pressure reaches the set value, the piston 63 continues to move downward, the flow hole 671 opens, and another path of fuel flows through the radial gap 68 between the inclined portion 631 and the inner wall of the hollow chamber 640 into the valve base 66, and finally flows out of the first distribution valve 51 to form the pre-combustion stage main oil circuit 42.

[0076] The first distribution valve 51 realizes dividing the first oil circuit into a pre-combustion stage auxiliary oil circuit 41 and a pre-combustion stage main oil circuit 42, and the radial gap 68 is opened only when the set oil pressure is reached, that is, the pre-combustion stage main oil circuit 42 is opened under the set oil pressure, and the oil pressure is positively correlated with the fuel flow rate, that is, when the fuel flow rate through the first distribution valve reaches the set value, the pre-combustion stage main oil circuit 42 is opened, and after opening, the fuel ratio of the pre-combustion stage auxiliary oil circuit is freely distributed according to the oil pressure and the flow area, and there is no need to set an oil collection structure to limit the fuel ratio of the pre-combustion stage auxiliary oil circuit.

[0077] refer to Figure 5B As shown, the structure of the third distribution valve 511 is similar to that of the first distribution valve 51, except that the size of the radial gap 68 is different. Figure 5A The radial clearance 68 is compared to Figure 5B The radial gap 68 is larger, so the opening pressure for opening the third distribution valve 511 is greater than that for the first distribution valve 51.

[0078] like Figure 6 As shown, in some embodiments, the structure of the second distribution valve 52 is similar to that of the first distribution valve 51, but without the second channel 642 and the flow hole 671. The arrow in the figure indicates the direction of fuel flow, which is similar to the working principle of the first distribution valve. When the oil pressure reaches the set value, the fuel flows through the radial gap 68 between the inclined portion 631 and the inner wall of the hollow chamber 640 into the valve base 66, and finally flows out of the second distribution valve to form the main combustion stage oil circuit 43. The second distribution valve realizes the opening of the main combustion stage oil circuit 43 under the set oil pressure, and the oil pressure is positively correlated with the fuel flow rate, that is, when the fuel flow rate through the second distribution valve reaches the set value, the main combustion stage oil circuit 43 is opened.

[0079] As described above, the present application also provides a fuel supply method, which uses the fuel supply system 100 received in the above embodiment. The supply method includes:

[0080] In the first working condition, the first oil circuit section is open and the second oil circuit section is closed, and the flow path of the fuel is such that the fuel only enters the pre-combustion stage auxiliary oil circuit 41 after passing through the first distribution valve 51;

[0081] In the second working condition, the first oil circuit is open and the second oil circuit is closed, and the flow path of the fuel is as follows: after passing through the first distribution valve 51, the fuel enters the pre-combustion stage auxiliary oil circuit 41 and the pre-combustion stage main oil circuit 42 respectively; after passing through the third distribution valve 511, the fuel only enters the pre-combustion stage auxiliary oil circuit 41;

[0082] In the third working condition, the first oil circuit is open and the second oil circuit is closed, and the flow path of the fuel is as follows: after the fuel passes through the first distribution valve 51 and the third distribution valve 511, it enters the pre-combustion stage auxiliary oil circuit 41 and the pre-combustion stage main oil circuit 42 respectively;

[0083] In the fourth operating condition, the first oil circuit section is opened, the second oil circuit section is opened, and the flow path of the fuel is: after passing through the first distribution valve 51, the third distribution valve 511, and the second distribution valve 52, the fuel enters the pre-combustion stage auxiliary oil circuit 41, the pre-combustion stage main oil circuit 42, and the main combustion stage oil circuit 43 respectively.

[0084] In summary, the beneficial effects of the combustion chamber, gas turbine engine, fuel supply system and method introduced in the above embodiments include but are not limited to the following: by setting a first distribution valve on part of the first oil circuit and a third distribution valve on another part, different opening pressures are achieved for the pre-combustion stage main oil circuit. Under slow-running conditions, the fuel flow is small and the fuel pressure drop is low. The third distribution valve device closes the flow-type hole entering the pre-combustion stage main oil circuit, and the first distribution valve device opens the flow-type hole entering the pre-combustion stage main oil circuit, so that the pre-combustion stage main nozzle in the circumferential part is opened, the atomization performance is improved, and the combustion efficiency is improved. Under conditions such as approach, the fuel flow increases and the fuel pressure drop increases. The first distribution valve and the third distribution valve simultaneously open the flow-type hole entering the pre-combustion stage main oil circuit, so that all the pre-combustion stage main nozzles in the circumferential direction are opened, so as to avoid excessive pressure in the nozzle inlet causing excessive burden on the oil pump.

[0085] Although the present invention is disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A fuel supply system (100), characterized in that: include: A plurality of fuel nozzles (25) are arranged corresponding to the combustion chamber head (22), wherein each fuel nozzle (25) comprises: The first oil circuit section comprises: a first oil inlet joint (53), and a first distribution valve (51) and a third distribution valve (511) located downstream of the first oil inlet joint (53); the first oil circuit extends from the first oil inlet joint (53) through the first distribution valve (51) or the third distribution valve (511), and is divided into a pre-combustion stage auxiliary oil circuit (41) and a pre-combustion stage main oil circuit (42) and extends respectively; the pre-combustion stage auxiliary oil circuit (41) extends to the pre-combustion stage auxiliary nozzle (31), and the pre-combustion stage main oil circuit (42) extends to the pre-combustion stage main nozzle (32); the pre-combustion stage auxiliary nozzle (31) and the pre-combustion stage main nozzle (32) provide diffusion combustion of the pre-combustion stage; the opening pressure of the third distribution valve (511) is greater than that of the first distribution valve (51); The second oil circuit portion comprises: a second oil inlet connector (54), and a second distribution valve (52) located downstream of the second oil inlet connector (54); the second oil circuit extends from the second oil inlet connector (54), passes through the second distribution valve (52), and then becomes a main combustion stage oil circuit (43), extending to the main combustion stage nozzle (33), providing premixed combustion of the main combustion stage.

2. The fuel supply system (100) according to claim 1, characterized in that: The fuel supply system (100) has a first operating condition, a second operating condition, a third operating condition, or a fourth operating condition: In the first working condition, the first oil circuit section is open and the second oil circuit section is closed, and the flow path of the fuel is such that the fuel only enters the pre-combustion stage auxiliary oil circuit (41) after passing through the first distribution valve (51) and the third distribution valve (511); In the second working condition, the first oil circuit section is opened and the second oil circuit section is closed, and the flow path of the fuel is as follows: after passing through the first distribution valve (51), the fuel enters the pre-combustion stage auxiliary oil circuit (41) and the pre-combustion stage main oil circuit (42) respectively; after passing through the third distribution valve (511), the fuel only enters the pre-combustion stage auxiliary oil circuit (41); In the third working condition, the first oil circuit section is opened and the second oil circuit section is closed, and the flow path of the fuel oil is as follows: after the fuel oil passes through the first distribution valve (51) and the third distribution valve (511), it enters the pre-combustion stage auxiliary oil circuit (41) and the pre-combustion stage main oil circuit (42) respectively; In the fourth working condition, the first oil circuit section is opened, the second oil circuit section is opened, and the flow path of the fuel oil is as follows: after the fuel oil passes through the first distribution valve (51), the third distribution valve (511), and the second distribution valve (52), it enters the pre-combustion stage auxiliary oil circuit (41), the pre-combustion stage main oil circuit (42), and the main combustion stage oil circuit (43) respectively.

3. The fuel supply system (100) according to claim 2, characterized in that: The first operating condition includes an ignition operating condition, the second operating condition includes an idling operating condition, the third operating condition includes an approach operating condition, and the fourth operating condition includes a climb and take-off operating condition.

4. The fuel supply system (100) according to claim 1, characterized in that: The first distribution valve (51) and the third distribution valve (511) include: A sleeve member (67) is provided with a receiving chamber (670), and a side wall of the sleeve member (67) is provided with a flow hole (671) penetrating the radial thickness of the side wall; End cap (61); An elastic member (62); A piston member (63), one axial end of the piston member (63) is arranged on the end cover (61), so that the piston member (63) and the end cover (61) can be displaced synchronously, and the elastic member (62) is connected to the end cover (61) at one end; A cylinder member (64), the cylinder member (64) is a fixed member, the end cover (61), the elastic member (62), the piston member (63) and the cylinder member (64) are located in the accommodating chamber (670), and the other end of the elastic member (62) is connected to the cylinder member (64); the cylinder member (64) provides a hollow chamber (640), the side wall of the hollow chamber (640) includes a first hole (641), a second hole (642), and an opening (643) located at the bottom, the other axial end of the piston member (63) cooperates with the opening (643), and the piston member (63) ) has an inclined surface (631) at the other axial end thereof, and a radial gap is formed between the inclined surface (631) and the inner wall of the hollow chamber (640). The piston member (63) is relatively displaced in the axial direction to open or close the opening (643). The first hole (641) allows the fuel in the accommodating chamber to enter the hollow chamber (640), and the second hole (642) is arranged corresponding to the flow hole (671), so that the fuel can flow from the hollow chamber (640) through the second hole (642) and the flow hole (671) to the pre-combustion stage auxiliary oil passage (41); The valve base (66) is provided with an oil outlet chamber (661) and an oil outlet (662), wherein the oil outlet chamber (661) and the oil outlet (662) are arranged corresponding to the opening (643), and the piston member (63) is relatively displaced in the axial direction to open or close the opening (643), so that the fuel oil can flow into the pre-combustion stage main oil passage (42) through the radial gap (68) between the inclined portion (631) and the inner wall of the hollow chamber (640), the opening (643), the oil outlet chamber (661), and the oil outlet (662); Wherein, the radial clearance (68) of the first distribution valve (51) is greater than the radial clearance (68) of the third distribution valve (511).

5. The fuel supply system (100) according to claim 1, characterized in that: The second dispensing valve (52) comprises: A sleeve member (67) providing a receiving chamber (670); End cap (61); An elastic member (62); A piston member (63), one axial end of the piston member (63) is arranged on the end cover (61), so that the piston member (63) and the end cover (61) can be displaced synchronously, and the elastic member (62) is connected to the end cover (61) at one end; The cylinder member (64) is a fixed member. The end cover (61), the elastic member (62), the piston member (63) and the cylinder member (64) are located in the accommodating chamber (670). The other end of the elastic member (62) is connected to the cylinder member (64). The cylinder member (64) provides a hollow chamber (640). The side wall of the hollow chamber (640) includes a first hole (641) and an opening (643) at the bottom. The piston member (63) is connected to the cylinder member (64). The other axial end of the piston member (63) cooperates with the opening (643), and the other axial end of the piston member (63) has an inclined surface (631), and a radial gap (68) is provided between the inclined surface (631) and the inner wall of the hollow chamber (640). The opening (643) is opened or closed by the relative axial displacement of the piston member (63), and the first hole (641) allows the fuel in the accommodating chamber to enter the hollow chamber (640); The valve base (66) is provided with an oil outlet chamber (661) and an oil outlet (662), wherein the oil outlet chamber (661) and the oil outlet (662) are arranged corresponding to the opening (643), and the piston member (63) is relatively displaced in the axial direction to open or close the opening (643), so that the fuel can pass through the radial gap between the inclined portion (631) and the inner wall of the hollow chamber (640), through the opening (643), the oil outlet chamber (661), and the oil outlet (662) and flow into the main combustion stage oil circuit (43).

6. A combustion chamber (2), characterized in that: It comprises a fuel nozzle and a fuel supply system (100) according to any one of claims 1 to 5.

7. The combustion chamber (2) according to claim 6, characterized in that The combustion chamber (2) comprises a plurality of combustion chamber heads (22) which are evenly arranged along the circumferential direction of the single-annular cavity structure of the combustion chamber (2).

8. The combustion chamber (2) according to claim 7, characterized in that The plurality of combustion chamber heads (22) are centrally hierarchical structures, and the number of the fuel nozzles (25) is the same as the number of the combustion chamber heads (22).

9. A gas turbine engine, characterized in that: It comprises a combustion chamber (2) as claimed in any one of claims 6 to 8 and a turbine (3) located downstream thereof, wherein the high-temperature combustion gas generated by the combustion chamber (2) drives the turbine (3) to output power.

10. The gas turbine engine according to claim 9, characterized in that The fuel supply system (100) is the fuel supply system (100) according to claim 2 or 3, and the gas turbine engine includes an ignition condition, an idling condition, an approach condition, and a climb and take-off condition; in the ignition condition, the fuel supply system (100) is in the first condition; in the idling condition, the fuel supply system (100) is in the second condition; in the approach condition, the fuel supply system (100) is in the third condition, and in the climb and take-off condition, the fuel supply system (100) is in the fourth condition.

11. A fuel supply method, characterized in that: A fuel supply system (100) as claimed in any one of claims 1 to 5 is used.

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