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

Abstract

The present application provides a combustion chamber, a gas turbine engine, a fuel supply system and a method. The fuel supply system comprises a plurality of fuel nozzle pairs arranged corresponding to the head of the combustion chamber, wherein each fuel nozzle comprises: a first oil passage part comprising a first oil inlet joint and a first distribution valve downstream of the first oil inlet joint, the first oil passage extending from the first oil inlet joint and being divided into a pre-combustion stage auxiliary oil passage and a pre-combustion stage main oil passage after the first distribution valve, the pre-combustion stage auxiliary oil passage extending to a pre-combustion stage auxiliary nozzle, and the pre-combustion stage main oil passage extending to a pre-combustion stage main nozzle; and a second oil passage part comprising a second oil inlet joint and a second distribution valve downstream of the second oil inlet joint, the second oil passage extending from the second oil inlet joint and being divided into a main combustion stage oil passage after the second distribution valve, and extending to a main combustion stage nozzle.

Description

TECHNICAL FIELD

[0001] The present application 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

[0002] With the atmospheric environmental problems being paid more and more attention by the countries around the world, the pollutant emission requirements of the aero-engines are also more and more stringent. The next generation of aero-engine product market demand shows that the emission of nitrogen oxides (NOx) is further reduced by about 15% to 30% than the current International Civil Aviation Organization (ICAO) standard CAEP8. The central staged lean combustion chamber can effectively reduce the emission of NOx. This central 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 supplies oil in the ignition state, the pre-combustion stage auxiliary oil path and the pre-combustion stage main oil path supply oil in the slow vehicle, approach 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 supply oil simultaneously in the climbing, take-off and other large states. Among them, the pre-combustion stage main oil path also plays a role in avoiding combustion oscillation. When the combustion oscillation occurs in the large working condition combustion chamber, part of the fuel of the main combustion stage can be distributed to the pre-combustion stage main oil path through the fuel distributor to enhance the relatively stable diffusion flame combustion, so as to weaken the combustion oscillation, and therefore the flow number of the pre-combustion stage main nozzle cannot be too small to avoid the nozzle pressure being too high to exceed the limit capacity of the oil pump. For this three-oil path nozzle, due to the large flow number of the pre-combustion stage main nozzle, the fuel flow is small in the slow vehicle working condition, and the pressure drop of the nozzle is very small, which leads to poor atomization performance and low combustion efficiency. SUMMARY

[0003] The purpose of the present application is to provide a fuel supply system.

[0004] Another purpose of the present application is to provide a combustion chamber.

[0005] Still another purpose of the present application is to provide a gas turbine engine.

[0006] Still another purpose of the present application is to provide a fuel supply method.

[0007] According to one aspect of the present application, a fuel supply system comprises a plurality of fuel nozzles arranged corresponding to the head of a combustion chamber, wherein each fuel nozzle comprises: a first oil passage part comprising a first oil inlet joint, a first distribution valve and a third distribution valve downstream of the first oil inlet joint, a first oil passage extending from the first oil inlet joint, passing through the first distribution valve or the third distribution valve, and then being divided into a pre-combustion stage auxiliary oil passage and a pre-combustion stage main oil passage, the pre-combustion stage auxiliary oil passage extending to a pre-combustion stage auxiliary nozzle, the pre-combustion stage main oil passage extending to a pre-combustion stage main nozzle, the pre-combustion stage auxiliary nozzle and the pre-combustion stage main nozzle providing diffusion combustion of the pre-combustion stage; and a second oil passage part comprising a second oil inlet joint and a second distribution valve downstream of the second oil inlet joint, a second oil passage extending from the second oil inlet joint, passing through the second distribution valve, and then being divided into a main combustion stage oil passage extending to a main combustion stage nozzle, providing premixed combustion of the main combustion stage.

[0008] The technical solution of the present application realizes different opening pressures of the distribution to the pre-combustion stage main oil passage by arranging the first distribution valve in part of the first oil passage part and arranging the third distribution valve in another part of the first oil passage part. In the slow vehicle working condition, the fuel flow is small, the fuel pressure drop is low, the third distribution valve device closes the flow-through type hole entering the pre-combustion stage main oil passage, the first distribution valve device opens the flow-through type hole entering the pre-combustion stage main oil passage, the circumferential part of the pre-combustion stage main nozzle is opened, the atomization performance is improved, and the combustion efficiency is improved. In the approach working condition, the fuel flow increases, the fuel pressure drop increases, the first distribution valve and the third distribution valve simultaneously open the flow-through type hole entering the pre-combustion stage main oil passage, the circumferential part of the pre-combustion stage main nozzle is opened, and the problem that the high inlet pressure of the nozzle causes the oil pump to bear too much load is avoided.

[0009] According to another aspect of the present application, a combustion chamber comprises the fuel supply system as described above.

[0010] According to still another aspect of the present application, a gas turbine engine comprises the combustion chamber as described above and a turbine downstream of the combustion chamber, the high-temperature gas generated by the combustion chamber driving the turbine to output power.

[0011] According to still another aspect of the present application, a fuel supply method uses the fuel supply system as described above. BRIEF DESCRIPTION OF DRAWINGS

[0012] The above and other features, properties, and advantages of the present application will become more apparent by describing in detail the following embodiments thereof with reference to the attached drawings, in which like reference numerals refer to like elements throughout the drawings and in which:

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

[0014] Figure 2 Structural diagram of a combustor according to an embodiment;

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

[0016] Figure 4 Structural diagram of a fuel nozzle of a fuel supply system according to an embodiment, from another perspective;

[0017] Figure 5A 、 Figure 5B Structural diagram of a first distribution valve, of a third distribution valve, respectively, of a fuel nozzle of a fuel supply system according to an embodiment;

[0018] Figure 6 Structural diagram of a second distribution valve of a fuel nozzle of a fuel supply system according to an embodiment;

[0019] Figure 7 Structural diagram of a fuel nozzle of a fuel supply system according to an embodiment.

[0020] List of reference numerals:

[0021] 0 fan

[0022] 1 compressor

[0023] 2 combustor

[0024] 3 turbine

[0025] 21 diffuser

[0026] 22 combustor head

[0027] 23 flame tube

[0028] 24 combustor case

[0029] 25 fuel nozzle

[0030] 31 pilot stage sub-nozzle

[0031] 32 pilot stage main nozzle

[0032] 33 main stage nozzle

[0033] 41 pilot stage sub-oil line

[0034] 42 pilot stage main oil line

[0035] 43 main stage oil line

[0036] 51 first distribution valve

[0037] 52 second distribution valve

[0038] 53 first oil inlet

[0039] 54 second oil inlet

[0040] 61 end cap

[0041] 62 spring

[0042] 63 piston member

[0043] 631 beveled portion

[0044] 64 cylinder member

[0045] 640 hollow chamber

[0046] 641 first bore

[0047] 642 second bore

[0048] 643 opening

[0049] 65 seal member

[0050] 66 valve base

[0051] 661 oil outlet chamber

[0052] 662 oil outlet

[0053] 67 sleeve member

[0054] 670 containment chamber

[0055] 671 flow passage

[0056] 68 radial gap. DETAILED DESCRIPTION

[0057] Reference will now be made in detail to various embodiments of the application, examples of which are illustrated in the accompanying drawings and described below. While the application will be described in conjunction with the exemplary embodiments, it will be understood that the application is not limited to the exemplary embodiments. On the contrary, the application is intended to cover alternatives, modifications, equivalents, and other embodiments, which can be included within the spirit and scope of the application as defined by the appended claims.

[0058] In the following description, "upstream", "downstream", or other orientation terms indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or component referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0059] Meanwhile, specific words are used in the present application to describe the embodiments of the present application. As "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 the "one embodiment" or "an embodiment" mentioned in different positions in the 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 properly combined.

[0060] At present, with the increasing demand for combustion chamber performance, it is necessary to further improve the fuel supply system.

[0061] In order to avoid combustion oscillation in large working condition, the existing three oil way fuel nozzle can distribute part of the main fuel stage fuel to the pre-combustion stage main oil way through the fuel distributor, enhance the relatively stable diffusion flame combustion, and weaken the combustion oscillation. Therefore, the flow number of the pre-combustion stage main nozzle cannot be too small, so as to avoid the nozzle inlet pressure being too high and exceeding the limit capacity of the oil pump. For such a three oil way nozzle, due to the large flow number of the pre-combustion stage main nozzle, in slow vehicle working condition, the fuel flow is small, the pre-combustion stage main oil way of all nozzles is opened, the nozzle pressure drop is small, which leads to poor atomization performance and low combustion efficiency.

[0062] Based on the above considerations, the inventor has designed a fuel supply system through in-depth research. By setting the first distribution valve on one part of the first oil way part and the third distribution valve on another part, the opening pressure of the distribution to the pre-combustion stage main oil way is different. In slow vehicle working condition, the fuel flow is small, the fuel pressure drop is low, the third distribution valve device closes the flow-through hole into the pre-combustion stage main oil way, the first distribution valve device opens the flow-through hole into the pre-combustion stage main oil way, the pre-combustion stage main nozzle of the circumferential part is opened, the atomization performance is improved, and the combustion efficiency is improved. In approach and other working conditions, the fuel flow increases, the fuel pressure drop increases, the first distribution valve and the third distribution valve open the flow-through hole into the pre-combustion stage main oil way at the same time, the pre-combustion stage main nozzle of the whole circumferential part is opened, and the high inlet pressure of the nozzle is avoided to cause the oil pump to bear too much.

[0063] Although the fuel supply system disclosed in the embodiments of the present application is applicable to aero-engines, it is not limited thereto, and can also be applicable to ground gas turbines and other scenarios.

[0064] As Figure 1As shown, a gas turbine engine, such as a turbofan engine, consists of components such as a compressor 1, a combustion chamber 2, and a turbine 3. The compressor 1 compresses air, which is then burned in the combustion chamber 2 to do work on the turbine 3, converting the chemical energy of the fuel into the mechanical energy of the turbine. The turbine then exhausts the gas and drives the fan 0 to generate thrust.

[0065] like Figure 2 As shown, in some embodiments, the combustion chamber 2 comprises a diffuser 21, a combustion chamber head 22, a flame tube 23, a combustion chamber casing 24, and fuel nozzles 25. The compressed airflow from the compressor 1 is decelerated and diffused by the diffuser 21 before entering the combustion chamber head 22 and flame tube 23, where it mixes with fuel injected by the fuel nozzles 25 and burns. The combustion chamber casing 24 surrounds the flame tube and is connected to the compressor 1 and turbine 3 before and after it passes through. In some embodiments, the combustion chamber heads 22 are uniformly arranged along the circumferential direction of the single-annular cavity structure of the combustion chamber 2; in some embodiments, the number of heads is 15 to 30. The combustion chamber heads 22 adopt a centrally graded structure. The number of fuel nozzles 25 is the same as the number of 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 fuel injectors. Fuel is pumped from the fuel tank to the fuel distributor by the fuel pump, and then distributed by the fuel distributor to the first fuel line and the second fuel line, that is, delivered to the first fuel inlet connector 53 and the second fuel inlet connector 54 of the fuel injector 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-way nozzle, including a first fuel line section and a second fuel line section. The first fuel line section includes a first fuel inlet connector 53, and a first distribution valve 51 or a third distribution valve 511 located downstream of the first fuel inlet connector 53. The first fuel line extends from the first fuel inlet connector 53, passes through the first distribution valve 51, and then divides into a pre-combustion stage auxiliary fuel line 41 and a pre-combustion stage main fuel line 42, which extend respectively. The pre-combustion stage auxiliary fuel line 41 extends to the pre-combustion stage auxiliary nozzle 31, and the pre-combustion stage main fuel line 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 for the pre-combustion stage. Regarding 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 passage part comprises a second oil inlet joint 54 and a second distribution valve 52 downstream of the second oil inlet joint 54, and the second oil passage extends from the second oil inlet joint 54 through the second distribution valve 52 to the main combustion stage oil passage 43 to the main combustion stage nozzle 33 to provide the main combustion stage premixed combustion.

[0069] For the working conditions of the gas turbine engine, such as the ignition working condition, the fuel distributor supplies fuel to the first oil passage part, and the second oil passage part is closed, the fuel enters the pre-combustion stage auxiliary oil passage 41 through the first distribution valve 51, and the pre-combustion stage auxiliary nozzle 31 works, which has the smallest number of flow rates, can ensure the atomization effect during ignition and ensure the ignition performance.

[0070] In the slow vehicle, approach and other working conditions, the fuel flow increases, the fuel distributor supplies fuel to the first oil passage part, and the second oil passage part is closed. However, there are differences between them. In the slow vehicle working condition, the first oil passage part is opened, the second oil passage part is closed, and the fuel flow path is: after the fuel passes through the first distribution valve 51, it enters the pre-combustion stage auxiliary oil passage 41 and the pre-combustion stage main oil passage 42, respectively, and after the fuel passes through the third distribution valve 511, it only enters the pre-combustion stage auxiliary oil passage 41. That is, 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 fuel into the pre-combustion stage auxiliary oil passage 41 and the pre-combustion stage main oil passage 42. While in the approach working condition, the first oil passage part is opened, the second oil passage part is closed, and the fuel flow path 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 passage 41 and the pre-combustion stage main oil passage 42, respectively. The reason is that the oil pressure in the approach working condition is slightly larger than that in the slow vehicle working condition, so that the first distribution valve 51 and the third distribution valve 511 can be opened.

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

[0072] In the climb, take-off working condition, the fuel distributor supplies fuel to the first oil passage part and the second oil passage part, the fuel of the first oil passage enters the pre-combustion stage auxiliary oil passage 41 and the pre-combustion stage main oil passage 42 through the first distribution valve 51 and the third distribution valve 511, and the fuel of the second oil passage enters the main combustion stage oil passage 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 number of flow rates, most of the fuel can be distributed to the main combustion stage nozzle 33 through the fuel distributor, and the main combustion stage fuel ratio is only controlled by the fuel distributor. The premixed combustion mode 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 distributor 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 distributor disclosed in the Chinese patent application for invention with the publication number CN104696126A and the title “Fuel distributor and engine applying the same”, but it is not limited thereto.

[0074] Reference Figure 5A As shown in the drawings, in some embodiments, the specific structure of the first distribution valve 51 can include an end cover 61, a spring 62, a piston 63, a cylinder 64, a valve base 66, and a sleeve 67. The sleeve 67 provides a containing chamber 670, and the side wall of the sleeve 67 is provided with a flow-through hole 671 that penetrates the radial thickness of the side wall; the axial one end of the piston 63 can be rod-shaped, provided in the end cover 61, so that the piston 63 and the end cover 61 can be synchronously displaced, and the spring 62 is connected to the end cover 61 at one end; the cylinder 64 is a fixed part, and the end cover 61, the spring 62, the piston 63, and the cylinder 64 are located in the containing chamber 670, and the other end of the spring 62 is connected to the cylinder 64; the cylinder 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 at the bottom, the axial other end of the piston 63 cooperates with the opening 643, and the axial other end of the piston 63 has a beveled portion 631 with a radial gap between the beveled portion 631 and the inner wall of the hollow chamber 640. The flow direction of the fuel is shown by the arrows in the drawings, and the fuel can pass through the piston 63 to open or close the opening 643 in the axial relative displacement, the first hole 641 is provided for the fuel in the containing chamber 670 to enter the hollow chamber 640, and the second hole 642 is provided corresponding to the flow-through hole 671, which can enable the fuel to pass from the hollow chamber 640 through the second hole 642 and the flow-through hole 671 to the pre-combustion stage auxiliary oil path 41. Preferably, the region of the cylinder 64 corresponding to the second hole 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 provided corresponding to the opening 643, and the opening 643 is opened or closed by the axial relative displacement of the piston 63, so that the fuel can pass through the radial gap between the beveled portion 631 and the inner wall of the hollow chamber 640, pass through the opening 643, the oil outlet chamber 661, and the oil outlet 662, and flow into the pre-combustion stage main oil path 42. The arrows in the drawings show the fuel flow direction, and it can be understood that the fuel flows into the cylinder 64 through the sleeve 67. One of the oil paths is to flow out of the first distribution valve through the second hole 642 and the flow-through hole 671, constituting the pre-combustion stage auxiliary oil path 41. In addition, the fuel pressure difference before and after pushes the piston 63 to move downward, and the spring 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 fuel flows through the radial gap 68 between the inclined part 631 and the inner wall of the hollow cavity 640 into the valve base 66, and finally flows out of the first distribution valve 51, forming the pre-combustion stage main oil circuit 42.

[0076] The first distribution valve 51 divides the first oil circuit into a pre-combustion stage auxiliary oil circuit 41 and a pre-combustion stage main oil circuit 42. The radial clearance 68 only opens when the set oil pressure is reached, which means that the pre-combustion stage main oil circuit 42 opens under the set oil pressure. Since the oil pressure is positively correlated with the fuel flow rate, the pre-combustion stage main oil circuit 42 opens when the fuel flow rate through the first distribution valve reaches the set value. 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, without the need to set up 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 third distribution valve 511 has a similar structure to the first distribution valve 51, except for the size of the radial clearance 68. It can be seen that... Figure 5A The radial clearance 68 compared to Figure 5B The radial clearance 68 is larger, therefore 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 it lacks the second channel 642 and the flow hole 671. The arrows in the figure indicate the fuel flow direction, which is similar to the working principle of the first distribution valve. When the oil pressure reaches a set value, fuel flows through the radial gap 68 between the inclined surface 631 and the inner wall of the hollow chamber 640 into the valve base 66, and finally flows out of the second distribution valve, forming the main combustion stage fuel passage 43. The second distribution valve enables the main combustion stage fuel passage 43 to open under a set oil pressure, and since oil pressure is positively correlated with fuel flow rate, the main combustion stage fuel passage 43 opens when the fuel flow rate through the second distribution valve reaches the set value.

[0079] Building upon the foregoing description, this application also provides a fuel supply method employing the fuel supply system 100 received in the above embodiments. This supply method includes:

[0080] In the first operating condition, the first oil circuit is open and the second oil circuit is closed. The flow path of the fuel is that after the fuel passes through the first distribution valve 51, it only enters the pre-combustion stage auxiliary oil circuit 41.

[0081] In the second operating condition, the first oil circuit is open and the second oil circuit is closed. 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 path part is opened, and the second oil path part is closed, and the flow path of the fuel is as follows: the fuel passes through the first distribution valve 51 and the third distribution valve 511, and then enters the pre-combustion stage auxiliary oil path 41 and the pre-combustion stage main oil path 42 respectively;

[0083] In the fourth working condition, the first oil path part is opened, and the second oil path part is opened, and the flow path of the fuel is as follows: the fuel passes through the first distribution valve 51, the third distribution valve 511 and the second distribution valve 52 respectively, and then enters the pre-combustion stage auxiliary oil path 41, the pre-combustion stage main oil path 42 and the main combustion stage oil path 43 respectively.

[0084] In summary, the beneficial effects of the combustion chamber, the gas turbine engine, the fuel supply system and the method introduced in the above embodiments include but are not limited to the following: by setting the first distribution valve on part of the first oil path part and the third distribution valve on another part, the opening pressure of the distribution to the pre-combustion stage main oil path is realized. In the slow vehicle working condition, the fuel flow is small, the fuel pressure drop is low, the third distribution valve device is closed to enter the flow-through type hole of the pre-combustion stage main oil path, the first distribution valve device is opened to enter the flow-through type hole of the pre-combustion stage main oil path, the circumferential part of the pre-combustion stage main nozzle is opened, the atomization performance is improved, and the combustion efficiency is improved. In the approach working condition, the fuel flow increases, the fuel pressure drop increases, the first distribution valve and the third distribution valve are opened to enter the flow-through type hole of the pre-combustion stage main oil path, the circumferential part of the pre-combustion stage main nozzle is opened, and the nozzle inlet pressure is too high to cause the oil pump to be too large.

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

Claims

1. A fuel supply system (100) characterized by, The application relates to a fuel supply system (100) for a gas turbine engine (1), comprising: a plurality of fuel nozzles (25) corresponding to a combustion chamber head (22), wherein each fuel nozzle (25) comprises: a first oil passage part comprising a first oil inlet joint (53) and a first distribution valve (51) and a third distribution valve (511) downstream of the first oil inlet joint (53), wherein the first oil passage 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 sub-oil passage (41) and a pre-combustion main-oil passage (42) which respectively extend to a pre-combustion sub-nozzle (31) and a pre-combustion main-nozzle (32) to provide diffusion combustion of the pre-combustion stage, and wherein the third distribution valve (511) has a higher opening pressure than the first distribution valve (51); a second oil passage part comprising a second oil inlet joint (54) and a second distribution valve (52) downstream of the second oil inlet joint (54), wherein the second oil passage extends from the second oil inlet joint (54) through the second distribution valve (52) and is divided into a main-combustion oil passage (43) which extends to a main-combustion nozzle (33) to provide premixed combustion of the main-combustion stage; the fuel supply system (100) has a first working condition, a second working condition, a third working condition or a fourth working condition: in the first working condition, the first oil passage part is open and the second oil passage part is closed, and the fuel flow path is that the fuel only enters the pre-combustion sub-oil passage (41) after passing through the first distribution valve (51) and the third distribution valve (511); in the second working condition, the first oil passage part is open and the second oil passage part is closed, and the fuel flow path is that the fuel enters the pre-combustion sub-oil passage (41) and the pre-combustion main-oil passage (42) after passing through the first distribution valve (51), and the fuel only enters the pre-combustion sub-oil passage (41) after passing through the third distribution valve (511); in the third working condition, the first oil passage part is open and the second oil passage part is closed, and the fuel flow path is that the fuel enters the pre-combustion sub-oil passage (41) and the pre-combustion main-oil passage (42) after passing through the first distribution valve (51) and the third distribution valve (511); in the fourth working condition, the first oil passage part is open and the second oil passage part is open, and the fuel flow path is that the fuel enters the pre-combustion sub-oil passage (41), the pre-combustion main-oil passage (42) and the main-combustion oil passage (43) after passing through the first distribution valve (51), the third distribution valve (511) and the second distribution valve (52) respectively.

2. The fuel supply system (100) according to claim 1, characterized in that The first working condition comprises an ignition working condition, the second working condition comprises an idle working condition, the third working condition comprises an approach working condition, and the fourth working condition comprises a climb and take-off working condition.

3. The fuel supply system (100) according to claim 1, characterized in that The first distribution valve (51) and the third distribution valve (511) comprise: a sleeve member (67) which provides a containing cavity (670), and the side wall of the sleeve member (67) is provided with a flow-through hole (671) which penetrates the radial thickness of the side wall. End cover (61); Elastic member (62); Piston member (63), one axial end of which is arranged in the end cover (61) so that the piston member (63) and the end cover (61) can be displaced synchronously, and the other end of the elastic member (62) is connected to the end cover (61); Cylinder member (64), which is a fixed member, the end cover (61), the elastic member (62), the piston member (63) and the cylinder member (64) being located in the accommodating chamber (670), and the other end of the elastic member (62) being connected to the cylinder member (64); the cylinder member (64) providing a hollow chamber (640), a side wall of the hollow chamber (640) comprising a first hole (641), a second hole (642) and an opening (643) at the bottom, the other axial end of the piston member (63) being matched with the opening (643), and the other axial end of the piston member (63) having a bevel portion (631) with a radial gap between the bevel portion (631) and the inner wall of the hollow chamber (640), the first hole (641) being used for fuel in the accommodating chamber to enter the hollow chamber (640), and the second hole (642) being arranged corresponding to the flow-through hole (671) so as to enable fuel in the hollow chamber (640) to pass through the second hole (642) and the flow-through hole (671) to the pre-combustion stage auxiliary oil passage (41); Valve seat (66), which provides an oil outlet chamber (661) and an oil outlet (662), the oil outlet chamber (661) and the oil outlet (662) being arranged corresponding to the opening (643), and the piston member (63) being axially displaced to open or close the opening (643) so as to enable fuel to flow into the pre-combustion stage main oil passage (42) through the radial gap (68) between the bevel 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 gap (68) of the first distribution valve (51) is greater than the radial gap (68) of the third distribution valve (511).

4. The fuel supply system (100) according to claim 1, characterized by The second distribution valve (52) comprises: Sleeve member (67), which provides an accommodating chamber (670); End cover (61); Elastic member (62); Piston member (63), one axial end of which is arranged in the end cover (61) so that the piston member (63) and the end cover (61) can be displaced synchronously, and the other end of the elastic member (62) is connected to the end cover (61); A cylinder member (64) is fixedly arranged 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) having a first hole (641) in the side wall and an opening (643) in the bottom, the other end of the piston member (63) is matched with the opening (643), and the other end of the piston member (63) has a bevel portion (631) having a radial gap (68) with the inner wall of the hollow chamber (640); the first hole (641) is used for the fuel in the accommodating chamber to enter the hollow chamber (640) by the axial relative displacement of the piston member (63) to open or close the opening (643); A valve base (66) provides a fuel outlet chamber (661) and a fuel outlet (662) corresponding to the opening (643), so that the fuel can flow into the main fuel stage oil path (43) through the opening (643), the fuel outlet chamber (661) and the fuel outlet (662) by the axial relative displacement of the piston member (63) to open or close the opening (643) and the radial gap between the bevel portion (631) and the inner wall of the hollow chamber (640).

5. A combustion chamber (2) characterized in that, The fuel supply system (100) comprises a fuel nozzle and the fuel supply system (100) according to any one of claims 1-4.

6. The combustion chamber (2) as claimed in claim 5, characterized in that The combustion chamber (2) comprises a plurality of combustion chamber heads (22) uniformly arranged along the circumferential direction of the single-ring cavity structure of the combustion chamber (2).

7. A combustion chamber (2) as claimed in claim 6, characterised in that The plurality of combustion chamber heads (22) are a central hierarchical structure, and the number of fuel nozzles (25) is the same as the number of combustion chamber heads (22).

8. A gas turbine engine characterized by, The combustion chamber (2) according to any one of claims 5-7 generates high-temperature gas to drive the turbine (3) to output power.

9. The gas turbine engine of claim 8, wherein, The fuel supply system (100) according to claim 1 or 2, wherein the gas turbine engine comprises an ignition working condition, a slow-speed working condition, an approach working condition, and a climbing and taking-off working condition; in the ignition working condition, the fuel supply system (100) is in the first working condition; in the slow-speed working condition, the fuel supply system (100) is in the second working condition; in the approach working condition, the fuel supply system (100) is in the third working condition; and in the climbing and taking-off working condition, the fuel supply system (100) is in the fourth working condition.

10. A fuel supply method characterized by comprising: The fuel supply system (100) according to any one of claims 1-4 is adopted.

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