Fuel nozzle and swirler assembling method for improving temperature field of combustion chamber

Abstract

The invention discloses a fuel nozzle and swirler assembly method for improving the temperature field of a combustion chamber, which comprises the following steps: S1, according to a set interval, swirlers are alternately and correspondingly assembled on swirler mounting positions of a flame tube according to the sequence of air flow from small to large or from large to small; s2, according to the set interval the same as that of the swirler, the fuel nozzles are alternately assembled on the fuel nozzle mounting positions of the fuel main pipe according to the sequence of the fuel flow from small to large or from large to small; and S3, the fuel oil main pipe with the fuel oil nozzles is assembled on the combustion chamber, the mounting position of the fuel oil nozzles of the fuel oil main pipe corresponds to the mounting position of the swirler of the flame tube, and the oil-gas ratios of all the heads on the flame tube are equal. The circumferential uniformity of fuel oil is improved, the oil-gas ratio between different heads in the flame tube is more uniform, a better combustion chamber outlet temperature field is obtained, the combustion chamber outlet temperature distribution quality under different working conditions is guaranteed, and the combustion chamber performance is improved.

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 temperature field at the combustion chamber outlet is one of the important indicators for evaluating the performance of the combustion chamber. It is usually characterized by the circumferential distribution coefficient (OTDF) and radial distribution coefficient (RTDF) of the combustion chamber outlet temperature. Improving the quality of the combustion chamber outlet temperature field has a very important impact on improving the engine performance and the service life of the turbine blades. Improving the quality of the combustion chamber outlet temperature distribution is of great significance to tapping the engine potential. For example, for a combustion chamber with a temperature rise of 1000℃, if the OTDF is reduced from 0.35 to 0.3, the average temperature at the combustion chamber outlet can be increased by 38.5℃ while keeping the maximum temperature at the combustion chamber outlet unchanged, which is very helpful for improving the engine performance; reducing the OTDF distribution coefficient, that is, reducing the hot spot temperature, can reduce the temperature gradient of the turbine guide vane, reduce the amount of cooling gas, and improve the work capacity of the engine high-pressure air; at the same time, reducing the RTDF distribution coefficient can improve the distribution of thermal stress along the blade height of the turbine blade and improve the service life of the turbine blade. Generally, in terms of design, the combustion chamber inlet flow field, flame tube structure, oil mist matching, mixing holes, etc. are designed and optimized to try to obtain a better combustion chamber outlet temperature distribution. However, in actual manufacturing, it is difficult to avoid certain deviations in parts processing, and the accumulation of these deviations will also cause the combustion chamber outlet temperature field to deviate from the design target. Therefore, in the development of the combustion chamber, it is also necessary to adopt some control measures by testing and matching components to obtain the best 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 select qualified parts to assemble the whole machine. The existing combination method does not give the matching requirements of the fuel nozzle and the swirl finder, and there is randomness in the matching, resulting in an inconsistent ratio (oil-gas ratio) between the fuel flow of the fuel nozzle at each head of the combustion chamber and the air flow of the swirl finder, making the oil-gas ratio of each head on the flame tube inconsistent, and it is easier to form local hot spots, which leads to unstable combustion chamber outlet temperature field. Therefore, how to match the test data of the fuel nozzle and the swirl finder to obtain a 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 swirler assembly method for improving the combustion chamber temperature field, so as to solve the technical problem that the existing fuel nozzle and swirler 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. According to the set intervals, the vortex finders are alternately assembled to the corresponding vortex finder installation positions of the flame tube in the order of air flow from small to large or from large to small;

[0008] S2. Alternately assemble the fuel nozzles at the fuel nozzle installation positions of the fuel main pipe in the order of fuel flow from small to large or from large to small according to the same set interval as the vortex finder;

[0009] S3. Assemble 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 swirler on the flame tube, so that the fuel flow of the fuel nozzle and the air flow of the swirler are in the same order, so that the oil-gas 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 carried out 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 small to large.

[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, each vortex finder 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.

[0014] Furthermore, in step S12, when numbering each vortex finder 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, arrange and number them from small to large flow rate;

[0017] S22, numbering the positions of the fuel nozzles on the fuel main pipe, wherein the serial numbers correspond to the serial numbers of the installation positions of each swirl finder on the flame tube;

[0018] S23, according to the set interval, the number of each fuel nozzle, and the position number of each fuel nozzle on each fuel main pipe, the fuel nozzles are alternately assembled to the fuel nozzle installation positions of the fuel main pipe in the order of fuel flow from small to large or from large to small.

[0019] Furthermore, the number of the fuel nozzles and the swirlers are both even numbers, 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 combining a fuel nozzle and a vortex finder for improving the temperature field of a combustion chamber. On the one hand, the method is based on the measured air flow of the vortex finder and the fuel flow of the fuel nozzle, and controls the matching of the fuel nozzle and the vortex finder to achieve "small with small" and "large with large", and a discontinuous combination matching method of small and large separated, thereby improving the circumferential uniformity of the fuel and avoiding the concentration of fuel in a certain area to obtain a better combustion chamber outlet temperature field; on the other hand, the method solves the problem of large dispersion of the outlet temperature field caused by random combination through a fixed matching method, and improves the consistency of the combustion chamber outlet temperature field. At the same time, the method can make the oil-gas ratio between different heads in the flame tube under different working conditions more uniform, so as to ensure the quality of the combustion chamber outlet temperature distribution under different working conditions and improve 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 with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the 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 It is a schematic flow chart of a fuel nozzle and swirl finder assembly method for improving the temperature field of a combustion chamber according to a preferred embodiment of the present application;

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

[0029] Figure 5 It is a schematic diagram of the sub-step flow 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 device; 6. Ignition nozzle; 7. Fuel main pipe. DETAILED DESCRIPTION

[0031] The embodiments of the present application are described in detail below in conjunction with 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 of the combustion chamber, a flame tube 2, an inner casing 3 of the combustion chamber, a fuel nozzle 4, a vortex generator 5, an ignition nozzle 6, and a fuel main pipe 7, wherein the vortex generator 5 is installed at the head of the flame tube 2. In each combustion chamber, there are multiple fuel nozzles 4 and vortex generators 5, the number of which is generally an even number, 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 combustion chamber outer casing 1, 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 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 of the present application.

[0034] like Figure 3 As shown, the 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. According to the set interval, each vortex finder 5 is alternately assembled to each vortex finder installation position of the flame tube 2 in the order of air flow from small to large or from large to small;

[0036] S2. Alternately assemble the fuel nozzles at the fuel nozzle installation positions of the fuel main pipe in the order of fuel flow from small to large or from large to small according to the same set interval as the vortex finder;

[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 in the same order of large and small, so that the oil-gas ratio of each head on the flame tube 2 is equivalent.

[0038] This embodiment provides a method for matching a fuel nozzle and a vortex finder for improving the temperature field of a combustion chamber. On the one hand, the method is based on the measured air flow of the vortex finder and the fuel flow of the fuel nozzle, and controls the matching of the fuel nozzle and the vortex finder to achieve "small with small" and "large with large", and a discontinuous combination matching method of small and large separated, thereby improving the circumferential uniformity of the fuel and avoiding the concentration of fuel in a certain area to obtain a better combustion chamber outlet temperature field; on the other hand, the method solves the problem of large dispersion of the outlet temperature field caused by random combination through a fixed matching method, and improves the consistency of the combustion chamber outlet temperature field. At the same time, the method can make the oil-gas ratio between different heads in the flame tube more uniform under different working conditions, so as to ensure the quality of the combustion chamber outlet temperature distribution under different working conditions and improve the combustion chamber performance.

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

[0040] S11. Before the vortex finder 5 is 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 from small to large, and numbered W1, W2, ... W12 respectively;

[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, 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, 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 of 1#, 3#, ..., 11#;

[0044] (2) Starting from the vortex finder installation position numbered 2# at the flame tube head, install a vortex finder at every other position in order from large to small, and complete the installation of vortex finders at even-numbered heads numbered 2#, 4#, ..., 12#.

[0045] This embodiment realizes the assembly of the swirler on 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, Figure 5 As shown, the step S2 specifically includes the steps of:

[0047] S21. After each fuel nozzle 4 is processed, a fuel flow test is carried out, and the fuel nozzles 4 are arranged and numbered from small to large in terms of flow rate, and the numbers are P1, P2, ..., P12;

[0048] S22, numbering the positions of the fuel nozzles on the fuel main pipe, with the serial numbers being Z1#, Z2#, ..., Z12#, respectively, and the serial numbers correspond to the serial numbers of the installation positions of each vortex finder on the flame tube 2;

[0049] 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, each fuel nozzle is alternately assembled to each fuel nozzle installation position of the fuel main pipe in the order of fuel flow from small to large or from large to small, 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, thereby 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 the order of the fuel flow rate of the fuel nozzle from large to small, thereby completing the assembly of the even-numbered positions numbered Z2#, Z4#, ..., Z12#.

[0052] This embodiment realizes the assembly of the fuel nozzle on the fuel main pipe 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 the above step S3, the fuel main pipe with the fuel nozzle 4 is assembled on the combustion chamber, and the fuel nozzle installation position of the fuel main pipe 7 corresponds to the swirl finder installation position of the flame tube, so that the fuel nozzle position numbered Z1# on the fuel main pipe corresponds to the swirl finder installation position numbered 1# on the flame tube. The fuel flow of the fuel nozzle 4 and the air flow of the swirl finder 5 are arranged in the same order, so that the oil-gas ratio of each head on the flame tube 2 is equivalent.

[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 is replaceable. For example, the small-flow vortex finder in the above-mentioned 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 every other interval, 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 of the present application can be numbered in a clockwise direction or adjusted to be numbered in a counterclockwise direction.

[0058] The principle of the above-mentioned embodiments is still to match "small with small" and "large with large", separate the small and the large and be discontinuous, so as to improve the circumferential uniformity of the fuel, avoid oil concentration in a certain area, and make 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 other 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 falling within the scope of the present application.

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

Claims

1. A method for assembling a fuel nozzle and a swirler for improving the temperature field of a combustion chamber, characterized in that: Includes 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 installation positions of the fuel main pipe in the order of fuel flow from small to large or from large to small according to the same set interval as the vortex finder; S3. Assemble the fuel main pipe with the fuel nozzle (4) on the combustion chamber, the fuel nozzle installation position of the fuel main pipe (7) corresponds to the swirl finder installation position of the flame tube, so that the fuel flow rate of the fuel nozzle (4) and the air flow rate of the swirl finder (5) are arranged in the same order, so that the oil-gas 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 performed on each vortex finder to test the air flow of each vortex finder, and the vortex finders are 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 the corresponding vortex finder installation positions 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 steps of: 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 swirl 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 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 numbers, 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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