Combustion chamber test piece and fuel nozzle thermal protection test method

Abstract

The invention aims to provide a combustion chamber test piece and a fuel nozzle thermal protection test method. The combustion chamber test piece comprises an outer cylinder and a cooling assembly. The cooling assembly comprises a straight pipe section and an annular pipe section, the straight pipe section comprises a first section and a second section, the first section is inserted into the outer barrel from the outer side of the outer barrel, and the second section is arranged on the inner side of the outer barrel in the axial direction of the outer barrel. And the annular pipe section is communicated with the second section. Wherein a plurality of first cooling holes distributed in the axial direction are formed in the second section, and a plurality of second cooling holes distributed around the inner circumference of the annular pipe section and a plurality of third cooling holes distributed around the outer circumference of the annular pipe section are formed in the annular pipe section. Through the combustion chamber test piece, the cooling effect in the combustion chamber test piece can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbine engine tests, and particularly to a combustion chamber test piece and a fuel nozzle thermal protection test method. Background Art

[0002] A gas turbine combustion chamber usually needs to carry out a large number of component tests to verify the performance of the combustion chamber scheme, including outlet temperature distribution tests, pollution emission tests, combustion efficiency tests, oscillation characteristic tests, thermal protection tests, etc. As the engine cycle parameters continue to increase, the outlet temperature of the combustion chamber continues to rise, and the outlet of the combustion chamber component test piece is subjected to the erosion of high-temperature gas, which poses a great challenge to the cooling design of the downstream adapter section test device of the combustion chamber test piece.

[0003] The existing adapter section test devices downstream of the combustion chamber test piece generally adopt a water-cooled jacket cooling structure. Such a design requires dividing the test device into an inner lining and an outer lining of the water-cooled jacket, and cooling water flows in the water-cooled channel formed between the inner lining and the outer lining of the water-cooled jacket. This cooling method has disadvantages such as a complex water-cooled channel structure, high trial production cost and difficulty, easy heat deformation of the inner lining and outer lining of the water-cooled jacket affecting the cooling effect, and inconvenience for maintenance, disassembly and assembly. These have become problems that need to be solved for the outlet test device of the combustion chamber test piece.

[0004] How to provide a combustion chamber test piece with good cooling effect is a problem that needs to be solved urgently at present. Summary of the Invention

[0005] The purpose of the present invention is to provide a combustion chamber test piece, which can improve the cooling effect inside the combustion chamber test piece.

[0006] The combustion chamber test piece for achieving the foregoing purpose includes:

[0007] An outer cylinder body, having an inlet side and an outlet side;

[0008] A cooling assembly, including:

[0009] A straight pipe section, including a first section and a second section, the first section is inserted into the outer cylinder body from the outside of the outer cylinder body, and the second section is arranged along the axial direction of the outer cylinder body inside the outer cylinder body; and

[0010] An annular pipe section, communicated with the second section;

[0011] Wherein, a plurality of first cooling holes are arranged along the axial direction on the second section, and a plurality of second cooling holes arranged around the inner circumference of the annular pipe section and a plurality of third cooling holes arranged around the outer circumference of the annular pipe section are provided on the annular pipe section.

[0012] In one or more embodiments, the annular pipe section is arranged on the inlet side of the outer cylinder.

[0013] In one or more embodiments, the second section is arranged offset from the axis of the outer cylinder, and a plurality of the first cooling holes are opened toward the axis.

[0014] In one or more embodiments, the annular pipe section is coaxially arranged with the outer cylinder.

[0015] In one or more embodiments, the annular pipe section and the second section are an integral part, and the second section and the first section are fixedly connected by an outer sleeve nut.

[0016] In one or more embodiments, the first cooling hole is an inclined hole opened on the second section.

[0017] In one or more embodiments, two adjacent first cooling holes are inclined and arranged in different directions.

[0018] In one or more embodiments, the apertures of the first cooling hole, the second cooling hole, and the third cooling hole are 0.8 millimeters to 2 millimeters.

[0019] In one or more embodiments, a drain port is arranged at the lower part of the outer cylinder.

[0020] On the other hand, according to some embodiments of the present application, a fuel nozzle thermal protection test method is further provided, which is characterized in that a thermal protection test device is used for the test, the thermal protection test device includes the combustion chamber test piece as described above, and the combustion chamber test piece is located at the downstream position of the flame tube in the thermal protection test device. Among them, the fuel nozzle thermal protection test method includes the following steps:

[0021] Heat the fuel and then introduce it into the fuel nozzle to be tested, so that the fuel flowing to the inlet of the fuel nozzle has a high oil temperature.

[0022] During the test, spray cooling water toward the inner side of the combustion chamber test piece through the cooling assembly, so as to cool the inner side of the combustion chamber and the flame tube connected thereto, so that no combustion occurs in the flame tube during the test.

[0023] The beneficial effects of the present invention are as follows:

[0024] By arranging the second cooling holes in the inner ring and the third cooling holes in the outer ring of this combustion chamber test piece, the presence of two concentric and outward high-speed cooling water jets forms a relatively comprehensive and uniform temperature reduction effect on the upstream incoming flow. At the same time, in combination with the first cooling holes along the way, it further reduces the temperature along the way inside the test piece, which can improve the cooling effect of the test piece and can be used in the nozzle thermal protection test without combustion to prevent the spontaneous combustion of the downstream high-temperature gas mixture. In addition, in the combustion chamber test piece with the above-mentioned configuration, the cooling assembly can also be used to extend into the flame area for emergency fire extinguishing.

[0025] The above description is only an overview of the technical solution of this application. In order to be able to understand the technical means of this application more clearly, it can be implemented in accordance with the content of the specification. And in order to make the above and other purposes, features and advantages of this application more obvious and understandable, the following specifically illustrates the specific implementation manners of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of this application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0027] Figure 1 Shows a three-dimensional schematic diagram according to some embodiments of this combustion chamber test piece;

[0028] Figure 2 Shows a semi-sectional schematic diagram according to some embodiments of this combustion chamber test piece;

[0029] Figure 3 Shows a three-dimensional schematic diagram according to some embodiments of this cooling assembly;

[0030] Figure 4 Shows a side schematic diagram according to some embodiments of this cooling assembly;

[0031] Figure 5 Shows Figure 4 An enlarged schematic diagram of part A;

[0032] Figure 6 Shows Figure 4 A cross-sectional schematic diagram in the B-B direction;

[0033] Figure 7 Shows Figure 6 An enlarged schematic diagram of part C. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0034] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above accompanying drawings are intended to cover non-exclusive inclusion.

[0036] In order to improve the test effect of the combustion chamber test piece, according to some embodiments of the present application, a combustion chamber test piece is provided, as Figure 1 shows a three-dimensional schematic diagram according to some embodiments of this combustion chamber test piece, Figure 2 shows a semi-sectional schematic diagram according to some embodiments of this combustion chamber test piece. The combustion chamber test piece includes an outer cylinder 1 and a cooling assembly 2, Figure 3 shows a three-dimensional schematic diagram according to some embodiments of this cooling assembly, Figure 4 shows a side schematic diagram according to some embodiments of this cooling assembly, Figure 5 shows Figure 4 an enlarged schematic diagram of part A of Figure 6 shows Figure 4 a sectional view in the B-B direction of Figure 7 shows Figure 6 an enlarged schematic diagram of part C of

[0037] The outer cylinder 1 has an inlet side 11 and an outlet side 12. The cooling assembly 2 includes a straight pipe section 21 and an annular pipe section 22. The straight pipe section 21 includes a first section 211 and a second section 212. The first section 211 is inserted into the outer cylinder 1 from the outside of the outer cylinder 1, and the second section 212 is arranged along the axial direction x of the outer cylinder 1 inside the outer cylinder 1. The annular pipe section 22 is communicated with the second section 212.

[0038] Wherein, a plurality of first cooling holes 31 are arranged along the axial direction x on the second section 212, and a plurality of second cooling holes 32 arranged around the inner circumference of the annular pipe section 22 and a plurality of third cooling holes 33 arranged around the outer circumference of the annular pipe section 22 are provided on the annular pipe section 22.

[0039] When cooling water is introduced through the water inlet that extends out of the outer cylinder 1 from the straight pipe section 21 by using the water supply device, the cooling water will spray out from multiple first cooling holes 31, multiple second cooling holes 32, and multiple third cooling holes 33 respectively. The normal-temperature cooling water flowing out from the cooling holes is mixed with the high-temperature gas mixture, and at the same time, part of the cooling water evaporates and absorbs heat, thereby achieving the effect of quickly reducing the temperature of the high-temperature gas mixture. Specifically, the multiple first cooling holes 31 will cool the temperature along the way inside the outer cylinder 1. The high-speed cooling water jets that spray inward centripetally at the second cooling holes 32 improve the mixing and evaporation ability of the cooling water jets, can cool the temperature of the high-temperature gas mixture in the central recirculation zone, and prevent the gas mixture from spontaneous combustion. The high-speed cooling water jets that spray centrifugally outward at the third cooling holes 33 can quickly reduce the temperature of the high-temperature gas in the outer ring area and the wall temperature of the outer cylinder 1. Among them, the two circles of high-speed cooling water jet directions formed by the second cooling holes 32 in the inner ring and the third cooling holes 33 in the outer ring only reduce the temperature of the downstream gas, and will not affect the normal operation of the test piece upstream of the combustion chamber.

[0040] By arranging the second cooling holes 32 in the inner ring and the third cooling holes 33 in the outer ring in this combustion chamber test piece, the existence of the two circles of high-speed cooling water jets formed, centripetally and centrifugally, has a relatively comprehensive and uniform cooling effect on the upstream incoming flow. At the same time, combined with the first cooling holes 31 along the way, it can further reduce the temperature along the way inside the test piece, improve the cooling effect of the test piece, and can be used in the nozzle thermal protection test without combustion to prevent the spontaneous combustion of the downstream high-temperature gas mixture. In addition, in the combustion chamber test piece with the configuration as described above, the cooling assembly 2 can also be used to extend into the flame area for emergency fire extinguishing.

[0041] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0042] Referring to "embodiment" in this article means that the specific features, structures or characteristics described in connection with the embodiment may be included in at least one embodiment of the present application. The phrase appears in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0043] In some embodiments of this combustion chamber test piece, the annular pipe section 22 is arranged on the inlet side 11 of the outer cylinder 1, so as to be able to cool the incoming flow first.

[0044] In some embodiments of the present combustion chamber test piece, the second section 212 is offset from the axis of the outer cylinder 1, and a plurality of first cooling holes 31 are opened towards the axis. With such an arrangement, it is possible to cool the airflow along the inner side of the combustion chamber test piece through the plurality of first cooling holes 31.

[0045] In some embodiments of the present combustion chamber test piece, the annular pipe section 22 is coaxially arranged with the outer cylinder 1, so that the cooling water ejected from the third cooling hole 33 can evenly reach the wall surface of the outer cylinder 1, avoiding the problem of uneven cooling of the inner wall of the outer cylinder 1 due to different distances.

[0046] In some embodiments of the present combustion chamber test piece, the annular pipe section 22 and the second section 212 are an integral part, and the second section 212 and the first section 211 are fixedly connected by an outer sleeve nut 4. The outer sleeve nut 4 can ensure the sealing effect between the connected first end 211 and the second end 212. In a specific embodiment, the annular pipe section 22 and the second section 212 can also be connected by a ball head sealing connection structure to ensure the connection reliability and the sealing effect. At the same time, by setting each pipe section to be detachably connected, the pipe sections can be quickly disassembled, replaced, and the maintenance cost and maintenance time can be reduced.

[0047] In some embodiments of the present combustion chamber test piece, the first cooling hole 31 is an inclined hole opened on the second section 212, which improves the cooling effect.

[0048] In some embodiments of the present combustion chamber test piece, two adjacent first cooling holes 31 are inclined and arranged in different directions to form a cooling hole arrangement form in which the forks are arranged at a certain angle, thereby further improving the cooling effect.

[0049] In some embodiments of the present combustion chamber test piece, the diameters of the first cooling hole 31, the second cooling hole 32, and the third cooling hole 33 are 0.8 mm to 2 mm. While avoiding the blockage of the cooling small holes by scale formed during long-term use due to a small cooling hole diameter, it can also ensure an increase in the jet velocity of the cooling water outlet to enhance the mixing and evaporation effects of the cooling water jet.

[0050] In some embodiments of the present combustion chamber test piece, the first section 211 is fixedly connected to the outer cylinder 1 by welding.

[0051] In some embodiments of the present combustion chamber test piece, a drain port 5 is provided at the lower part of the outer cylinder 1 for discharging the accumulated water in the outer cylinder 1 during the test debugging process to avoid the accumulated water affecting the normal progress of the combustion chamber test. In a specific embodiment, an opening and closing switch can be provided at the drain port 5. During the test process, due to the high upstream flow velocity and temperature, the cooling water is evaporated or carried downstream of the test piece, and there will be no accumulated water. At this time, the drain port 5 can be closed.

[0052] According to some embodiments of the present application, a method for testing the thermal protection of a fuel nozzle is further provided. The test is carried out by using a thermal protection test device, which includes a combustion chamber test piece as described in the previous one or more embodiments. The combustion chamber test piece is located downstream of the flame tube in the thermal protection test device. Wherein, the method for testing the thermal protection of the fuel nozzle includes the following steps:

[0053] Heat the fuel and then introduce it into the fuel nozzle to be tested, so that the fuel flowing to the inlet of the fuel nozzle has a high oil temperature;

[0054] During the test, spray cooling water towards the inner side of the combustion chamber test piece through the cooling assembly, so as to cool the inner side of the combustion chamber and the connected flame tube, so that no combustion occurs in the flame tube during the test.

[0055] With the combustion chamber test piece having the aforementioned configuration, by setting the second cooling holes 32 in the inner circle and the third cooling holes 33 in the outer circle, the presence of two concentric and outward high-speed cooling water jets can form a relatively comprehensive and uniform temperature reduction effect on the upstream incoming flow. Thus, it is possible to conduct a thermal protection test on the fuel nozzle under the condition that no combustion occurs in the flame tube, which can simplify the cumbersome process of the thermal protection test, improve the test efficiency and reduce the test cost.

[0056] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0057] It should be understood that "along" a certain direction mentioned in the text means having at least a component in that direction. Preferably, the included angle with that direction is within 10°, and more preferably, the included angle is within 5°.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A combustion chamber test piece, characterized in that: include: An outer cylinder having an inlet side and an outlet side; Cooling assembly, including: a straight pipe section, comprising a first section and a second section, wherein the first section is inserted into the outer cylinder from the outer side of the outer cylinder, and the second section is arranged inside the outer cylinder along the axial direction of the outer cylinder; and a ring pipe section, connected to the second section; The second section is provided with a plurality of first cooling holes arranged along the axial direction, and the annular tube section is provided with a plurality of second cooling holes arranged around the inner circumference of the annular tube section and a plurality of third cooling holes arranged around the outer circumference of the annular tube section.

2. The combustion chamber test piece according to claim 1, characterized in that: The annular pipe section is arranged at the inlet side of the outer cylinder.

3. The combustion chamber test piece according to claim 1, characterized in that: The second section is offset from the axis of the outer cylinder, and the plurality of first cooling holes are opened toward the axis.

4. The combustion chamber test piece according to claim 3, characterized in that: The annular tube section is coaxially arranged with the outer cylinder.

5. The combustion chamber test piece according to claim 1, characterized in that: The annular tube section and the second section are an integral piece, and the second section and the first section are fixedly connected via a sleeve nut.

6. The combustion chamber test piece according to claim 1, characterized in that: The first cooling hole is an inclined hole opened on the second section.

7. The combustion chamber test piece according to claim 6, characterized in that: Two adjacent first cooling holes are arranged obliquely in different directions.

8. The combustion chamber test piece according to claim 1, characterized in that: The diameters of the first cooling hole, the second cooling hole and the third cooling hole are in a range of 0.8 mm to 2 mm.

9. The combustion chamber test piece according to claim 1, characterized in that: A drain port is arranged at the lower part of the outer cylinder.

10. A fuel nozzle thermal protection test method, characterized in that: A thermal protection test device is used for testing, wherein the thermal protection test device comprises a combustion chamber test piece according to any one of claims 1 to 9, wherein the combustion chamber test piece is located downstream of a flame tube in the thermal protection test device, wherein the fuel nozzle thermal protection test method comprises the following steps: After heating the fuel, the fuel is passed into the fuel nozzle to be tested, so that the fuel flowing to the inlet of the fuel nozzle has a high oil temperature; During the test, cooling water is sprayed toward the inside of the combustion chamber test piece through the cooling assembly to cool the inside of the combustion chamber and the flame tube connected thereto, so that no combustion occurs in the flame tube during the test.

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