A fuel nozzle and swirl finder assembly method for improving combustion chamber temperature field

Abstract

The present application discloses a method for assembling a fuel nozzle and a swirler for improving the temperature field in a combustion chamber, comprising the following steps: S1. Alternately assembling each swirler to each swirler mounting position of the flame tube in the order of air flow from small to large or from large to small according to a set interval; S2. Alternately assembling each fuel nozzle to each fuel nozzle mounting position of the fuel manifold in the order of fuel flow from small to large or from large to small according to the same set interval as the swirler; S3. Assembling the fuel manifold with fuel nozzles on the combustion chamber, with the fuel nozzle mounting positions of the fuel manifold corresponding to the swirler mounting positions of the flame tube, so that the oil-gas ratio of each head on the flame tube is equivalent. The present application improves the circumferential uniformity of the fuel, making the oil-gas ratio between different heads in the flame tube more uniform, thereby obtaining a better combustion chamber outlet temperature field, ensuring the quality of the combustion chamber outlet temperature distribution under different operating conditions, and improving combustion chamber performance.

Description

Technical Field

[0001] The present application relates to the technical field of aero-engines, and in particular, to a method for assembling a fuel nozzle and a swirler for improving the temperature field of a combustion chamber. Background Art

[0002] The combustor outlet temperature field is a key indicator for evaluating combustor performance. It is typically characterized by the circumferential temperature distribution coefficient (OTDF) and radial temperature distribution coefficient (RTDF). Improving the quality of the combustor outlet temperature field has a significant impact on improving engine performance and turbine blade life. Improving the quality of the combustor outlet temperature distribution is crucial for unlocking engine potential. For example, for a combustor with a temperature rise of 1000°C, reducing the OTDF from 0.35 to 0.3 can increase the average combustor outlet temperature by 38.5°C while maintaining the maximum combustor outlet temperature, significantly improving engine performance. Lowering the OTDF distribution coefficient, i.e., reducing the hotspot temperature, can reduce the temperature gradient in the turbine guide vanes, reduce cooling air consumption, and improve the engine's high-pressure air performance. Furthermore, lowering the RTDF distribution coefficient can improve the distribution of thermal stress along the blade height, thereby increasing turbine blade life. Generally, optimal combustor outlet temperature distribution is achieved through design and optimization of the combustor inlet flow field, flame tube structure, oil mist matching, and mixing holes. However, in actual manufacturing, certain deviations in component processing are unavoidable, and the accumulation of these deviations can cause the combustion chamber outlet temperature field to deviate from the design target. Therefore, during combustion chamber development, it is necessary to implement control measures such as component testing and matching to achieve the optimal combustion chamber outlet temperature field quality and reduce the dispersion of the combustion chamber outlet temperature distribution coefficient.

[0003] At present, in the development of combustion chambers, in order to ensure the performance of the combustion chamber, it is generally necessary to conduct flow tests on the swirl finder and atomization performance tests on the fuel nozzle, and screen the parts with qualified performance to assemble the whole machine. The existing combination method does not provide matching requirements for the fuel nozzle and the swirl finder, and there is randomness in the matching between them, resulting in an inconsistent ratio (oil-gas ratio) between the fuel flow of the fuel nozzle and the air flow of the swirl finder at each head of the combustion chamber. This makes the oil-gas ratio of each head on the flame tube inconsistent, making it easier to form local hot spots, which leads to unstable temperature field at the combustion chamber outlet. Therefore, how to match the test data of the fuel nozzle and swirl finder to obtain better distribution quality of the combustion chamber outlet temperature field and smaller dispersion is a problem that needs to be solved in the development of the combustion chamber. Summary of the Invention

[0004] The present application provides a fuel nozzle and swirl finder assembly method for improving the combustion chamber temperature field, so as to solve the technical problem that the existing fuel nozzle and swirl finder assembly method is random and easily leads to poor stability of the combustion chamber outlet temperature field.

[0005] The technical solutions adopted in this application are as follows:

[0006] A method for assembling a fuel nozzle and a swirler for improving the temperature field of a combustion chamber comprises the following steps:

[0007] S1. Alternately assemble the swirlers to the corresponding swirler installation positions of the flame tube in the order of small to large or large to small air flow according to the set intervals;

[0008] S2. Alternately assemble the fuel nozzles at the fuel nozzle mounting positions of the fuel manifold in the order of fuel flow rate from small to large or from large to small, using the same set intervals as the vortex finders;

[0009] S3. Install the fuel main pipe with the fuel nozzle on the combustion chamber. The installation position of the fuel nozzle on the fuel main pipe corresponds to the installation position of the swirl finder on the flame tube, so that the fuel flow of the fuel nozzle and the air flow of the swirl finder are in the same order of large and small, so that the oil-air ratio of each head on the flame tube is equivalent.

[0010] Furthermore, the step S1 specifically includes the steps of:

[0011] S11. Before the vortex finders are welded and fixed to the flame tube, an air flow test is conducted on each vortex finder. The air flow of each vortex finder is tested and the air flow of each vortex finder is arranged and numbered from the smallest to the largest flow rate.

[0012] S12. Before welding the vortex finder on the flame tube, number each vortex finder installation position on the flame tube;

[0013] S13. According to the set interval, the number of each vortex finder, and the number of each vortex finder installation position, the vortex finders are alternately assembled to the corresponding vortex finder installation positions of the flame tube head in the order of small to large or large to small air flow.

[0014] Furthermore, in step S12, when numbering each swirler installation position of the flame tube, the numbering is performed in a clockwise direction or counterclockwise direction.

[0015] Furthermore, the step S2 specifically includes the steps of:

[0016] S21. After each fuel nozzle is processed, conduct a fuel flow test and arrange and number them in ascending order of flow rate;

[0017] S22. Number the fuel nozzle positions on the fuel main pipe, with the numbering sequence corresponding to the sequence number of each swirl finder installation position on the flame tube;

[0018] S23. Alternately assemble the fuel nozzles to the corresponding fuel nozzle installation positions on the fuel manifolds in the order of fuel flow rate from small to large or from large to small, based on the set intervals, the fuel nozzle numbers, and the fuel nozzle position numbers on the fuel manifolds.

[0019] Furthermore, the number of the fuel nozzles and swirlers is an even number, and both are equal and evenly arranged in the circumferential direction.

[0020] Furthermore, the number of the set intervals is ≥1.

[0021] This application has the following beneficial effects:

[0022] The present application provides a method for assembling a fuel nozzle and a swirl finder for improving the combustion chamber temperature field. On the one hand, this method is based on the measured swirl finder air flow rate and the fuel nozzle fuel flow rate, and by controlling the matching of the fuel nozzle and the swirl finder, a "small with small" and "large with large" combination method is achieved, where small and large are separated by discontinuous pairing methods, thereby improving the circumferential uniformity of the fuel and avoiding the concentration of fuel in a certain area, so as to obtain a better combustion chamber outlet temperature field. On the other hand, this method solves the problem of large dispersion of the outlet temperature field caused by random combination through a fixed matching method, thereby improving the consistency of the combustion chamber outlet temperature field. At the same time, this method can make the oil-gas ratio between different heads in the flame tube more uniform under different operating conditions, thereby ensuring the quality of the combustion chamber outlet temperature distribution under different operating conditions and improving the combustion chamber performance.

[0023] In addition to the above-described purposes, features and advantages, the present application also has other purposes, features and advantages. The present application will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0025] Figure 1 It is a schematic diagram of the combustion chamber structure;

[0026] Figure 2 This is a schematic diagram of the circumferential distribution position of the flame tube head;

[0027] Figure 3 This is a flow chart of a method for assembling a fuel nozzle and a swirler for improving the temperature field of a combustion chamber according to a preferred embodiment of the present application;

[0028] Figure 4 This is a schematic flow chart of the sub-steps of step S1 in the preferred embodiment of the present application;

[0029] Figure 5 It is a schematic flow chart of the sub-steps of step S2 in the preferred embodiment of the present application.

[0030] As shown in the figure: 1. Combustion chamber outer casing; 2. Flame tube; 3. Combustion chamber inner casing; 4. Fuel nozzle; 5. Swirl flow generator; 6. Ignition nozzle; 7. Fuel main pipe. DETAILED DESCRIPTION

[0031] The embodiments of the present application are described in detail below with reference to the accompanying drawings, but the present application can be implemented in a variety of different ways defined and covered below.

[0032] like Figure 1 As shown, the combustion chamber includes an outer casing 1, a flame tube 2, an inner casing 3, a fuel nozzle 4, a swirl finder 5, an ignition nozzle 6, and a fuel manifold 7. The swirl finder 5 is installed at the head of the flame tube 2. In each combustion chamber, there are multiple fuel nozzles 4 and swirl finders 5. The number is generally even, and the two are equal and evenly arranged in the circumferential direction (see Figure 2 ), specifically, the vortex finder 5 is fixed to the front end of the flame tube 2 by welding, the fuel nozzle 4 is installed on the outer casing 1 of the combustion chamber, and the fuel nozzle 4 is inserted into the center of the vortex finder 5 at the front end of the flame tube, wherein the number of the fuel nozzle 4 and the vortex finder 5 are both 12.

[0033] Below is Figure 1 The combustion chamber shown is taken as an example to illustrate the fuel nozzle and swirler assembly method for improving the temperature field of the combustion chamber in the present application.

[0034] like Figure 3 As shown, a preferred embodiment of the present application provides a method for assembling a fuel nozzle and a swirler for improving the temperature field of a combustion chamber, comprising the steps of:

[0035] S1. Alternately assemble the swirlers 5 to the corresponding swirler installation positions of the flame tube 2 in the order of air flow from small to large or from large to small according to the set intervals;

[0036] S2. Alternately assemble the fuel nozzles at the fuel nozzle mounting positions of the fuel manifold in the order of fuel flow rate from small to large or from large to small, using the same set intervals as the vortex finders;

[0037] S3. Assemble the fuel main pipe with the fuel nozzle 4 on the combustion chamber. The installation position of the fuel nozzle of the fuel main pipe 7 corresponds to the installation position of the swirler of the flame tube, so that the fuel flow of the fuel nozzle 4 and the air flow of the swirler 5 are arranged in the same order, so that the oil-air ratio of each head on the flame tube 2 is equivalent.

[0038] This embodiment provides a method for pairing a fuel nozzle and swirl finder for improving the combustion chamber temperature field. This method, based on the measured swirl finder air flow and fuel nozzle fuel flow, controls the matching of the fuel nozzle and swirl finder to achieve a "small with small" and "large with large" pairing method, with small and large separated by discontinuous pairs. This improves the circumferential uniformity of the fuel and avoids fuel concentration in a particular area, thereby achieving a more optimal combustion chamber outlet temperature field. Furthermore, through a fixed matching method, this method addresses the problem of large dispersion in the outlet temperature field caused by random combinations, thereby improving the consistency of the combustion chamber outlet temperature field. Furthermore, this method can achieve a more uniform oil-to-gas ratio between different heads within the flame tube under different operating conditions, thereby ensuring the quality of the combustion chamber outlet temperature distribution under different operating conditions and improving combustion chamber performance.

[0039] Preferably, if Figure 4 Said step S1 specifically includes the steps of:

[0040] S11. Before the swirl finders 5 are welded and fixed to the flame tube 2, an air flow test is performed on each swirl finder. The air flow of each swirl finder is tested and the air flow of each swirl finder is arranged and numbered from smallest to largest, namely W1, W2, ..., W12;

[0041] S12, before welding the vortex finder 5 on the flame tube 2, number each vortex finder installation position of the flame tube 2, numbering them 1#, 2#, ..., 12# respectively;

[0042] S13, according to the set interval, the number of each vortex finder, and the number of each vortex finder installation position, the vortex finders 5 are alternately assembled in the order of small to large or large to small air flow to the corresponding vortex finder installation positions of the flame tube head, specifically:

[0043] (1) Starting from the vortex finder installation position numbered 1# at the flame tube head, install a vortex finder at every other position according to the vortex finder flow rate from small to large, and complete the installation of vortex finders at odd-numbered heads 1#, 3#, ..., 11#;

[0044] (2) Starting from the vortex finder installation position numbered 2# at the flame tube head, assemble one vortex finder at each position in descending order, and complete the assembly of vortex finders at even-numbered heads numbered 2#, 4#, ..., 12#.

[0045] This embodiment realizes the assembly of the swirler at the flame tube head through the above steps, ensuring that the swirler is separated according to small and large flow rates and is discontinuous, thereby improving the circumferential uniformity of the fuel and avoiding the concentration of fuel in a certain area.

[0046] Specifically, if Figure 5 As shown, the step S2 specifically includes the following steps:

[0047] S21. After each fuel nozzle 4 is processed, a fuel flow rate test is carried out. The nozzles are arranged in ascending order of flow rate and numbered P1, P2, ..., P12.

[0048] S22. Number the fuel nozzle positions on the fuel main pipe, with the serial numbers being Z1#, Z2#, ..., Z12#, respectively. The serial numbers correspond to the serial numbers of the installation positions of each swirl finder on the flame tube 2;

[0049] S23. Based on the set intervals, the numbers of the fuel nozzles 4, and the position numbers of the fuel nozzles on the fuel manifolds, the fuel nozzles are alternately installed in the order of fuel flow rate from small to large or from large to small, corresponding to the fuel nozzle installation positions on the fuel manifolds. Specifically:

[0050] (1) Starting from the fuel nozzle position numbered Z1#, assemble one fuel nozzle at every other position in the order of fuel flow rate from small to large, thus completing the assembly of fuel nozzles at odd-numbered positions numbered Z1#, Z3#, ..., Z11#;

[0051] (2) Next, starting from the fuel nozzle position numbered Z2# on the fuel main pipe, assemble a fuel nozzle at every other position in descending order of fuel flow rate, thus completing the assembly of even-numbered positions numbered Z2#, Z4#, ..., Z12#.

[0052] This embodiment realizes the assembly of the fuel nozzles on the fuel manifold through the above steps, ensuring that the fuel nozzles are separated according to the small and large fuel flow rates and are discontinuous, thereby improving the circumferential uniformity of the fuel and avoiding the concentration of fuel in a certain area.

[0053] Specifically, in step S3, the fuel manifold with fuel nozzles 4 is assembled on the combustion chamber. The fuel nozzles on the fuel manifold 7 are positioned so that they correspond to the swirl finder positions on the flame liner. This ensures that the fuel nozzle position numbered Z1 on the fuel manifold corresponds to the swirl finder position numbered 1 on the flame liner. This ensures that the fuel flow rate of the fuel nozzle 4 and the air flow rate of the swirl finder 5 are aligned in order of magnitude, ensuring a consistent fuel-to-air ratio at each head of the flame liner 2.

[0054] Through the above combination pairing method, the fuel nozzle 4 numbered P1 is paired with the swirler 5 numbered W1, so that the fuel flow of the fuel nozzle 4 and the air flow of the swirler 5 are in the same order of large and small, so that the oil-gas ratio of each head on the flame tube is equivalent.

[0055] Preferably, the circumferential arrangement order described in the present application can be replaced. For example, the small flow vortex finder in the above embodiment is assembled starting from the vortex finder installation position numbered 1#, and it can also be replaced by assembling the small flow vortex finder starting from the vortex finder installation position numbered 2#, and the corresponding large flow vortex finder is assembled starting from the vortex finder installation position numbered 1#.

[0056] Preferably, in the circumferential distribution, the present application arranges the fuel nozzles 4 and the vortex finders 5 at intervals of 1, which can be replaced by other interval distances, such as arranging them in 3 groups, 1#, 4#, 7#, 10# as a group, 2#, 5#, 8#, 11# as a group; 3#, 6#, 9#, 12 as a group.

[0057] The vortex finder installation position numbering of the flame tube head in this application can be numbered in a clockwise direction or adjusted to be numbered in a counterclockwise direction.

[0058] The principle of the above embodiments is still to match small with small and match large with large, separate small and large and be discontinuous, thereby improving the circumferential uniformity of the fuel, avoiding the concentration of oil in a certain area, and making the oil-gas ratio between different heads in the flame tube more uniform, so as to ensure the quality of the combustion chamber outlet temperature distribution under different working conditions and improve the performance of the combustion chamber.

[0059] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0060] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A method for assembling a fuel nozzle and a swirl finder for improving the temperature field of a combustion chamber, characterized in that: Including steps: S1. According to the set intervals, the vortex finders (5) are alternately assembled to the corresponding vortex finder installation positions of the flame tube (2) in the order of air flow from small to large or from large to small; S2. Alternately assemble the fuel nozzles at the fuel nozzle mounting positions of the fuel manifold in the order of fuel flow rate from small to large or from large to small, using the same set intervals as the vortex finders; S3. Assemble the fuel main pipe with the fuel nozzle (4) on the combustion chamber. The installation position of the fuel nozzle of the fuel main pipe (7) corresponds to the installation position of the swirl finder of the flame tube, so that the fuel flow of the fuel nozzle (4) and the air flow of the swirl finder (5) are arranged in the same order of large and small, so that the oil-air ratio of each head on the flame tube (2) is equal.

2. The method for assembling a fuel nozzle and a swirler for improving the temperature field of a combustion chamber according to claim 1, characterized in that: The step S1 specifically includes the following steps: S11. Before the vortex finders (5) are welded and fixed to the flame tube (2), an air flow test is carried out on each vortex finder to test the air flow of each vortex finder, and the air flow of each vortex finder is arranged and numbered in ascending order of flow rate; S12, before welding the vortex finder (5) on the flame tube (2), numbering each vortex finder installation position of the flame tube (2); S13, according to the set interval, the number of each vortex finder, and the number of each vortex finder installation position, each vortex finder (5) is alternately assembled to each vortex finder installation position of the flame tube head in the order of air flow from small to large or from large to small.

3. The method for assembling a fuel nozzle and a swirler for improving the temperature field of a combustion chamber according to claim 2, characterized in that: In step S12, when numbering each vortex finder installation position of the flame tube (2), the numbering is performed in a clockwise direction or counterclockwise direction.

4. The method for assembling a fuel nozzle and a swirler for improving the temperature field of a combustion chamber according to claim 1, characterized in that: The step S2 specifically includes the following steps: S21. After each fuel nozzle (4) is processed, a fuel flow rate test is carried out, and the nozzles are arranged and numbered in ascending order of flow rate; S22, numbering the positions of the fuel nozzles on the fuel main pipe, wherein the numbering sequence corresponds to the sequence number of the installation position of each vortex finder on the flame tube (2); S23, according to the set interval, the number of each fuel nozzle (4), and the position number of each fuel nozzle on each fuel main pipe, the fuel nozzles are alternately assembled to the corresponding fuel nozzle installation positions of the fuel main pipe in the order of fuel flow from small to large or from large to small.

5. The method for assembling a fuel nozzle and a swirler for improving the temperature field of a combustion chamber according to claim 1, characterized in that: The number of the fuel nozzles (4) and the vortex finders (5) are both even, and both are equal and evenly arranged in the circumferential direction.

6. The method for assembling a fuel nozzle and a swirler for improving the temperature field of a combustion chamber according to claim 1, characterized in that: The number of the set intervals is ≥1.

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