Full annular combustion chamber inner flow field measuring device and measuring method

Abstract

This invention discloses a flow field measurement device and method for an annular combustion chamber, comprising: an intake system including an intake structure for connecting to the head of the annular combustion chamber, the intake structure having intake channels matching the number and circumferential position of the head of the annular combustion chamber; a tracer particle generator for injecting tracer particles into one or more intake channels to obtain a target tracer particle concentration in a target measurement area; an exhaust system including an exhaust structure for connecting to the tail end of the outer casing of the annular combustion chamber, the exhaust structure guiding the exhaust gas from the annular combustion chamber out; and a PIV measurement system for emitting sheet-like lasers into the interior of the annular combustion chamber at one or more preset circumferential positions and measuring the flow field within the annular combustion chamber.

Description

Technical Field

[0001] This invention relates to the field of aero-engine technology, and in particular, to a flow field measurement device for a full-annular combustion chamber. Furthermore, this invention also relates to a method for measuring the flow field in a full-annular combustion chamber, including the aforementioned flow field measurement device. Background Technology

[0002] The complex structure and confined space of aero-engine combustion chambers make measuring their internal flow fields extremely difficult. Early methods employed pitot tubes and hot-wire thermometers, but these were contact-based, single-point measurements that significantly interfered with the flow and lacked accuracy. Later, laser measurement methods were developed, such as Laser Doppler Velocimetry (LDV) and Phase Doppler Particle Analyzer (PDPA). These achieved non-contact measurements, eliminating flow field interference and greatly improving accuracy. However, they remained single-point measurements, which still had significant limitations for the highly turbulent flow fields inside aero-engine combustion chambers, failing to capture the actual internal flow characteristics. With the rapid development of computer, laser, and image processing technologies, Particle Image Velocimetry (PIV) emerged. It enables non-contact, transient, and full-field flow field measurements and has gradually become the primary method for measuring the internal flow fields of aero-engine combustion chambers. The measurement principle involves introducing tracer particles (typically 1-2 μm in diameter) with good airflow tracking into the flow field to be measured. A dual-pulse sheet laser illuminates the flow field twice in a very short time (typically on the order of μs), while simultaneously recording two particle position images in the vertical direction using a dual-frame, dual-exposure camera. The velocity field of the tracer particles across the entire plane is obtained through cross-correlation calculations, and then the velocity of the tracer particles is used to represent the velocity of the airflow at the corresponding location. Considering the large size and airflow of the annular combustion chamber, and its complex structure, directly applying PIV technology to its internal flow field measurement presents many technical challenges. Due to the complex structure and large airflow of the annular combustion chamber, it is impossible to meet the requirements for a good measurement optical path arrangement and tracer particle concentration during PIV measurement. Currently, it is not possible to achieve full-size, full-annular internal flow field measurement. Existing measurement methods mainly include:

[0003] 1) Design a full-ring combustion chamber model test piece, and simplify the combustion chamber structure and open a large area window to achieve a better optical path arrangement. This method can obtain key flow information, but cannot obtain the flow characteristics brought about by the key detailed structure of the combustion chamber.

[0004] 2) Cut out one or three heads from the full annular combustion chamber for flow field measurement, and then use the measured flow field to reflect the full annular flow field. Although this method can obtain key information on the flow field of a single or three combustion chamber heads, it cannot reflect the interaction characteristics between adjacent heads and the circumferential flow characteristics in the full annular combustion chamber.

[0005] 3) For full-ring high-flow-rate flow field tests, a large amount of tracer particles is required, and multiple tracer particle generators need to be used to inject tracer particles at the same time, which increases costs and requires multiple personnel to make simultaneous adjustments, causing great inconvenience to the test. Summary of the Invention

[0006] This invention provides a flow field measurement device and method for a full-annular combustion chamber, which solves the technical problems of existing technologies where flow field measurement in a full-annular combustion chamber is difficult to reflect internal flow characteristics and has high testing costs and complex operation.

[0007] According to one aspect of the present invention, a flow field measuring device for an all-annular combustion chamber is provided, comprising:

[0008] An intake system includes an intake structure for connection to an annular combustion chamber, the intake structure having intake passages that match the number and circumferential position of the heads of the annular combustion chamber, respectively.

[0009] A tracer particle generator is used to inject tracer particles into one or more of the said air intake channels to obtain a target tracer particle concentration in a target measurement area;

[0010] An exhaust system includes an exhaust structure for connecting to the rear end of the outer casing of a full-annular combustion chamber, the exhaust structure being used to guide the exhaust gases from the full-annular combustion chamber out.

[0011] The PIV measurement system is used to emit sheet-like lasers into the interior of the annular combustion chamber at one or more preset circumferential positions and measure the flow field inside the annular combustion chamber.

[0012] As a further improvement to the above technical solution, the PIV measurement system includes a laser endoscope, a camera endoscope, a first mounting structure disposed on the exhaust structure, and a second mounting structure disposed on the annular combustion chamber. Multiple first mounting structures are evenly distributed circumferentially along the exhaust structure and matched to the circumferential position of the intake channel. Multiple second mounting structures are evenly distributed circumferentially along the annular combustion chamber and matched to the circumferential position of the intake channel. The first and second mounting structures at the same circumferential position are used to mount the laser endoscope and the camera endoscope, respectively. The axes of the first and second mounting structures are arranged perpendicular to each other.

[0013] As a further improvement to the above technical solution, the axis of the first mounting structure passes through the center of the flame tube's cavity height, and the axis of the second mounting structure passes through the center of the flame tube's cavity height, or through the axis of the full-annular combustion chamber, or through both the center of the flame tube's cavity height and the axis of the full-annular combustion chamber.

[0014] As a further improvement to the above technical solution, the first mounting structure includes a first endoscope hole disposed in the exhaust structure and a sealing mounting seat installed in the first endoscope hole, and the second mounting structure includes a second endoscope hole disposed in the outer casing of the full-annular combustion chamber and a sealing mounting seat installed in the second endoscope hole.

[0015] As a further improvement to the above technical solution, the second mounting structure includes multiple sets of second endoscopic holes arranged along the airflow direction at circumferential positions corresponding to each of the air intake channels.

[0016] As a further improvement to the above technical solution, the exhaust structure has a contraction cone and an exhaust pipe. The radial dimension of the large end of the contraction cone matches and is connected to the radial dimension of the tail end of the annular combustion chamber. The exhaust pipe is connected to the small end of the contraction cone. The first mounting structure is disposed on the contraction cone.

[0017] As a further improvement to the above technical solution, the air intake structure is cylindrical, the air intake structure is constructed as a double-layer structure and forms a sandwich cavity, the air intake end of the full-annular combustion chamber is connected to the sandwich cavity, the sandwich cavity is provided with a partition structure to form air intake channels in the sandwich cavity that match the number and circumferential position of the head of the full-annular combustion chamber, and the air intake structure is provided with tracer particle injection ports corresponding to the positions of each air intake channel.

[0018] As a further improvement to the above technical solution, the air intake structure is provided with multiple tracer particle injection ports along the airflow direction corresponding to the positions of each air intake channel.

[0019] As a further improvement to the above technical solution, the outer casing of the full-annular combustion chamber and the outer ring of the flame tube are respectively set as transparent structures, and the PIV measurement system is based on the high-energy sheet laser with a large divergence angle irradiating the head region of the full-annular combustion chamber.

[0020] According to another aspect of the present invention, a method for measuring the flow field in a full-annular combustion chamber is also provided, comprising the aforementioned flow field measuring device for a full-annular combustion chamber, the measurement method comprising:

[0021] S1. Measurement preparation: Install the test specimen and measuring device, and connect the tracer particle generator, gas source, and measurement circuit.

[0022] S2. Connect the camera to the camera endoscope, connect the laser to the laser endoscope, and run the PIV measurement system;

[0023] S3. Start the test, adjust the tracer particle injection according to the test conditions to ensure that the measurement area has a suitable concentration of tracer particles, and adjust the tracer particle injection range until the flow field measurement in the entire annular combustion chamber is completed.

[0024] S4. Conduct measurement experiments to obtain measurement data.

[0025] The present invention has the following beneficial effects:

[0026] The intake system of this measuring device has multiple intake channels, with the circumferential position of each intake channel matching the circumferential position of each combustion chamber head. Each intake channel corresponds to a combustion chamber head, and tracer particle generators are connected to each intake channel. By controlling the tracer particle generators to inject tracer particles into one or more intake channels, the target tracer particle concentration in the target measurement area can be obtained. The tracer area range for each combustion chamber head can be flexibly adjusted according to actual operating conditions. In specific applications, when the test conditions are relatively small (i.e., the airflow is small), fewer tracer particles are required. The tracer particle generator outlet branches out into multiple channels, simultaneously injecting tracer particles into multiple intake channels along the circumference of the intake structure. In this case, a tracer particle concentration meeting the measurement requirements can be obtained over a large area of ​​the corresponding combustion chamber head. When the test conditions increase (i.e., the airflow is large), the number of intake channels for injecting tracer particles can be gradually reduced, decreasing the tracer area inside the combustion chamber to ensure a suitable tracer particle concentration. When the test conditions are even larger (i.e., the airflow is even greater), the range of tracer particles can be adjusted accordingly. This method allows the tracer particle generator outlets to be concentrated in a single intake channel for injection. Multiple tracer particle injection ports along the airflow direction within this intake channel can be used simultaneously until a sufficient concentration of tracer particles is achieved at the combustion chamber head corresponding to that intake channel. This measurement device ensures a suitable concentration of tracer particles is maintained within the measurement area, providing a reliable guarantee for subsequent optical measurements. The referenced PIV measurement system emits and measures a sheet laser at the combustion chamber head region where tracer particles are injected, achieving measurement of the corresponding position inside the combustion chamber. By extending into the test piece to emit and / or measure the internal flow field using a sheet laser, the flow field within the entire annular combustion chamber head is measured. Based on ensuring the tracer particle concentration in the measurement area while maintaining the intake channel structure, the target measurement area is measured until the entire annular combustion chamber is measured. This effectively reflects the interaction characteristics between adjacent heads and the circumferential flow characteristics within the annular combustion chamber, while avoiding the use of multiple tracer particle generators and the need for multiple personnel for adjustment, effectively reducing costs.

[0027] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0028] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0029] Figure 1 This is a measurement schematic diagram of a preferred embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the air intake structure of a preferred embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the airflow of the tracer particle generator according to a preferred embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the internal measurement section of the combustion chamber according to a preferred embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram showing the positional relationship between the first mounting structure and the combustion chamber head in a preferred embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of the opening direction of the endoscope hole in a preferred embodiment of the present invention;

[0035] Figure 7 This is a schematic diagram of the flow field measurement of the semi-annular cross section in Embodiment 2 of the present invention.

[0036] Legend for the numbers: 100, intake structure; 110, tracer particle injection port; 120, pressure measuring device; 130, intake passage; 140, partition structure; 200, full-annular combustion chamber; 210, outer casing; 211, second mounting structure; 220, flame tube; 300, exhaust structure; 310, contraction cone; 311, first mounting structure; 320, exhaust pipe; 400, camera endoscope; 500, laser endoscope; 600, connecting flange. Detailed Implementation

[0037] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0038] Example 1

[0039] Figure 1 This is a measurement schematic diagram of a preferred embodiment of the present invention; Figure 2 This is a schematic diagram of the air intake structure of a preferred embodiment of the present invention; Figure 3This is a schematic diagram of the airflow of the tracer particle generator according to a preferred embodiment of the present invention; Figure 4 This is a schematic diagram of the internal measurement section of the combustion chamber according to a preferred embodiment of the present invention; Figure 5 This is a schematic diagram showing the positional relationship between the first mounting structure and the combustion chamber head in a preferred embodiment of the present invention.

[0040] like Figures 1 to 5 As shown, the flow field measurement device inside the full-annular combustion chamber 200 in this embodiment includes:

[0041] The intake system includes an intake structure 100 for connection to an annular combustion chamber 200, the intake structure 100 having intake passages 130 that match the number and circumferential position of the heads of the annular combustion chamber 200, respectively.

[0042] A tracer particle generator is used to inject tracer particles into one or more air intake channels 130 to obtain a target tracer particle concentration in the target measurement area.

[0043] The exhaust system includes an exhaust structure 300 for connecting to the rear end of the outer casing 210 of the annular combustion chamber 200, the exhaust structure 300 for guiding the exhaust gas from the annular combustion chamber 200 out.

[0044] The PIV measurement system is used to emit sheet lasers into the interior of the annular combustion chamber 200 at any one or more preset circumferential positions and measure the flow field within the annular combustion chamber 200.

[0045] The intake structure 100, the test piece, and the exhaust structure 300 are connected by a connecting flange 600; the tracer particle generator adopts the existing technology tracer particle generator, and the PIV measurement system has the same application principle as the existing technology PIV measurement system, which will not be elaborated on here.

[0046] It is understood that the intake structure 100 of the intake system of this measuring device is constructed with multiple intake channels 130, and the circumferential position of each intake channel 130 matches the circumferential position of each combustion chamber head, so that each intake channel 130 corresponds to a combustion chamber head. The tracer particle generator is connected to each intake channel 130. By controlling the tracer particle generator to inject tracer particles into any one or more intake channels 130, the target measurement area can obtain the target tracer particle concentration. The tracer area of ​​each combustion chamber head can be flexibly adjusted according to the actual working conditions. In specific applications, when the test conditions are relatively small (i.e., the airflow is low), fewer tracer particles are required. The tracer particle generator outlet branches off into multiple channels 130 along the circumference of the intake structure 100, simultaneously injecting tracer particles into multiple intake channels 130. In this case, a sufficient tracer particle concentration for measurement can be obtained over a large area at the head of the corresponding combustion chamber. When the test conditions increase (i.e., the airflow is high), the number of intake channels 130 for injecting tracer particles can be gradually reduced, decreasing the tracer area inside the combustion chamber to ensure a suitable tracer particle concentration. When the test conditions are large (i.e., the airflow is high), the number of intake channels 130 for injecting tracer particles can be gradually reduced to decrease the tracer area inside the combustion chamber, ensuring a suitable tracer particle concentration. In a step-up manner, the tracer particle generator outlets can be concentrated into a single intake channel 130 for injection. Multiple tracer particle injection ports 110 along the airflow direction within this intake channel 130 can be used simultaneously until a sufficient tracer particle concentration is achieved at the combustion chamber head corresponding to that intake channel 130. This measurement device ensures that a suitable concentration of tracer particles is maintained within the measurement area, providing a reliable guarantee for subsequent optical measurements. The referenced PIV measurement system emits a sheet-like laser and measures the combustion chamber head region where tracer particles are injected, thus achieving the measurement of the combustion... Measurements at corresponding locations inside the combustion chamber are achieved by inserting a sheet laser into the test piece to emit and / or measure the internal flow field, thus measuring the flow field inside the head of the annular combustion chamber 200. Based on ensuring the concentration of tracer particles in the measurement area while maintaining the structure of the intake channel 130, measurements are performed on the target measurement area until the measurement of the annular combustion chamber 200 is completed. This effectively reflects the interaction characteristics between adjacent heads and the circumferential flow characteristics in the annular combustion chamber 200, while avoiding the use of multiple tracer particle generators and multiple personnel for adjustment and operation, effectively reducing costs.

[0047] In some preferred embodiments, the PIV measurement system includes a laser endoscope 500, a camera endoscope 400, a first mounting structure 311 disposed on the exhaust structure 300, and a second mounting structure 211 disposed on the annular combustion chamber 200. Multiple first mounting structures 311 are evenly distributed circumferentially along the exhaust structure 300 and matched to the circumferential position of the intake channel 130. Multiple second mounting structures 211 are also evenly distributed circumferentially along the annular combustion chamber 200 and matched to the circumferential position of the intake channel 130. The first mounting structure 311 and the second mounting structure 211 at the same circumferential position are used to mount the laser endoscope 500 and the camera endoscope 400, respectively. The axis of the first mounting structure 311 is perpendicular to the axis of the second mounting structure 211, ensuring that the axis of the camera endoscope 400 is perpendicular to the axis of the laser endoscope 500, thereby guaranteeing effective acquisition of the sheet-like laser light incident into the test piece and realizing the measurement of the corresponding flow field cross-section.

[0048] Furthermore, multiple first mounting structures 311 are evenly distributed circumferentially along the exhaust structure 300 and matched with the circumferential position of the intake channel 130. The axis of the first mounting structure 311 passes through the center of the cavity height of the flame tube 220, and the axis of the second mounting structure 211 passes through the center of the cavity height of the flame tube 220 and / or the axis of the annular combustion chamber 200. Multiple second mounting structures 211 are evenly distributed circumferentially along the annular combustion chamber 200 and matched with the circumferential position of the intake channel 130. The first mounting structure 311 and the second mounting structure 211 at the same circumferential position are used to mount the laser endoscope 500 and the camera endoscope 400, respectively. It should be noted that this measuring device, by setting the first mounting structure 311 and the second mounting structure 211, enables the lateral camera endoscope 400 or laser endoscope 500 to be mounted. The endoscope 0 extends into the outer casing 210 and can inject sheet laser or acquire images through the holes on the surface of the flame tube 220; the axially arranged camera endoscope 400 or laser endoscope 500 extends into the combustion chamber and passes through the center of the cavity height of the flame tube 220 based on its axis, injecting sheet laser or acquiring image information into the flame tube 220 through the opening position of the flame tube 220; it should be understood that the first mounting structure 311 and the second mounting structure 211 at the same circumferential position are used to install the laser endoscope 500 and the camera endoscope 400, respectively, that is, sheet laser can be injected from the side / radial and images can be acquired from the axis, or sheet laser can be injected from the axis and images can be acquired from the side / radial, thereby realizing multi-section flow field measurement at different internal positions, significantly improving the spatial coverage and data integrity of the measurement.

[0049] In some preferred embodiments, the first mounting structure 311 includes a first endoscope located in the exhaust structure 300 and a sealing mounting seat installed in the first endoscope. The second mounting structure 211 includes a second endoscope located in the outer casing 210 of the annular combustion chamber 200 and a sealing mounting seat installed in the second endoscope. It is understood that by installing the first endoscope at a matching position in the exhaust structure 300 and providing a sealing mounting seat in the first endoscope for mounting a laser endoscope 500 or a camera endoscope 400, and by opening a second endoscope in the outer casing 210 and providing a sealing mounting seat for mounting a laser endoscope 500 or a camera endoscope 400, both lateral and axial mounting seats can be used to emit sheet lasers or acquire images, making the optical path layout reasonable and improving the measurement space coverage. Compared with the method of simplifying the structure and opening a large observation window, opening an endoscope significantly reduces the impact on the flow field, and allows the use of a 1:1 test piece instead of a simulation piece, enabling the acquisition of key flow information and flow characteristics brought about by detailed structures.

[0050] In some preferred embodiments, the second mounting structure 211 includes multiple sets of second endoscopes arranged along the airflow direction at circumferential positions corresponding to each air intake channel 130. It is understood that by arranging multiple endoscopes in the axial direction, multi-section flow field measurements at different positions inside the combustion chamber can be further realized, and more accurate flow field measurement information can be obtained.

[0051] In some preferred embodiments, the circumferential position of the first mounting structure 311 matches the head position of the full-annular combustion chamber 200 or is located between the heads of the two full-annular combustion chambers 200. The circumferential position of the first endoscope can be arranged directly opposite the head of the combustion chamber or between the two heads, depending on the measurement needs, making the structure more flexible.

[0052] In some preferred embodiments, the exhaust structure 300 includes an exhaust pipe having a converging cone 310 and an exhaust pipe 320. The radial dimension of the large end of the converging cone 310 matches and is connected to the radial dimension of the tail end of the annular combustion chamber 200. The exhaust pipe 320 is connected to the small end of the converging cone 310. The first mounting structure 311 is disposed on the converging cone 310. Specifically, by setting the converging cone 310, exhaust guidance is achieved, and the first mounting structure 311 is more easily arranged to ensure that the height of the first endoscope axis is consistent with the center of the flame tube 220 cavity height.

[0053] In some preferred embodiments, the intake structure 100 is cylindrical and has a double-layer structure with a sandwich cavity. The intake end of the annular combustion chamber 200 is connected to the sandwich cavity. A partition structure 140 is provided in the sandwich cavity to form intake channels 130 that match the number and circumferential position of the heads of the annular combustion chamber 200. The intake structure 100 is provided with tracer particle injection ports 110 corresponding to the positions of each intake channel 130. The partition structure 140 can be a baffle structure, which separates the sandwich cavity to form multiple intake channels 130, and each intake channel 130 corresponds to a combustion chamber head.

[0054] In some preferred embodiments, the intake structure 100 is provided with a plurality of tracer particle injection ports 110 along the airflow direction at the positions corresponding to each intake channel 130. The concentration of tracer particles injected into the intake channel 130 can be adjusted by the number of injection ports opened. The tracer area range of each combustion chamber head can be flexibly adjusted according to the test conditions, thereby ensuring that a suitable concentration of tracer particles is maintained throughout the entire measurement area. On the other hand, the structure of the intake channel 130 makes the circumferential air intake of the combustion chamber more uniform.

[0055] In some preferred embodiments, a pressure measuring device 120 is provided on the outer wall of the end of the air intake structure 100. The air intake pressure of the corresponding air intake channel 130 is adjusted according to the feedback control of the pressure measuring device 120 to ensure that the test requirements and test needs are met. A mounting seat is provided on the outer wall of the air intake structure 100 for sealing and mounting the pressure measuring device 120. The pressure measuring device 120 is implemented using the pressure measuring device 120 of the prior art.

[0056] On the other hand, a preferred embodiment of the present invention also provides a method for measuring the flow field in a full-annular combustion chamber, which utilizes the aforementioned flow field measuring device in a full-annular combustion chamber, and the measurement method includes:

[0057] S1. Measurement preparation: Install the test specimen and measuring device, and connect the tracer particle generator, gas source, and measurement circuit.

[0058] S2. Connect the camera to the camera endoscope, connect the laser to the laser endoscope, and run the PIV measurement system;

[0059] S3. Start the test. Adjust the tracer particle injection according to the test conditions to ensure that the measurement area has a suitable concentration of tracer particles. Adjust the size of the flow field measurement area by adjusting the tracer particle injection range until the flow field measurement in the entire annular combustion chamber is completed.

[0060] S4. Conduct measurement experiments to obtain measurement data; when measuring the flow field at different cross-sections, change the endoscope or interchange the positions of the laser endoscope and the camera endoscope.

[0061] Example 2

[0062] The difference between this embodiment and Embodiment 1 is that, referring to... Figure 7 The combustion chamber outer casing and the outer ring of the flame tube are designed as transparent structures, and a high-energy sheet laser with a large divergence angle is used to illuminate the head area. This allows for the simultaneous coverage and acquisition of measurement data for half of the annular flow field, thereby greatly increasing the effective area for a single measurement. On the other hand, an observation window can be opened at the constriction cone of the exhaust pipe 320 at the tail end, provided that the constriction cone at the flame tube outlet does not affect the camera's imaging of the key flow field at the head. This allows for direct high-brightness, high-resolution imaging using the camera. The location of this window must ensure that the camera can simultaneously capture multiple head flow fields from the tail end, ultimately achieving a large field of view and high-resolution flow field measurement.

[0063] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0064] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A flow field measuring device for a full-annular combustion chamber, characterized in that, include: An intake system includes an intake structure (100) for connection to an annular combustion chamber (200). The intake structure (100) has intake channels (130) that match the number and circumferential position of the heads of the annular combustion chamber (200). The intake structure (100) is cylindrical and is constructed as a double-layer structure with a sandwich cavity. The intake end of the annular combustion chamber (200) is connected to the sandwich cavity. A partition structure (140) is provided in the sandwich cavity to form intake channels (130) that match the number and circumferential position of the heads of the annular combustion chamber (200). The intake structure (100) is provided with tracer particle injection ports (110) corresponding to the positions of each intake channel (130). A tracer particle generator is used to inject tracer particles into one or more of the air intake channels (130) to obtain a target tracer particle concentration in the target measurement area; The exhaust system includes an exhaust structure (300) for connection to the rear end of the outer casing (210) of the annular combustion chamber (200), the exhaust structure (300) for guiding the exhaust gas from the annular combustion chamber (200) out. The PIV measurement system is used to emit sheet-like lasers into the interior of the full-annular combustion chamber (200) at any one or more preset circumferential positions and to measure the flow field within the full-annular combustion chamber (200).

2. The flow field measuring device for the entire annular combustion chamber according to claim 1, characterized in that, The PIV measurement system includes a laser endoscope (500), a camera endoscope (400), a first mounting structure (311) disposed on the exhaust structure (300), and a second mounting structure (211) disposed on the annular combustion chamber (200). A plurality of first mounting structures (311) are evenly distributed along the circumference of the exhaust structure (300) and matched with the circumferential position of the intake channel (130). A plurality of second mounting structures (211) are evenly distributed along the circumference of the annular combustion chamber (200) and matched with the circumferential position of the intake channel (130). The first mounting structure (311) and the second mounting structure (211) at the same circumferential position are respectively used to mount the laser endoscope (500) and the camera endoscope (400). The axis of the first mounting structure (311) and the axis of the second mounting structure (211) are arranged perpendicular to each other.

3. The flow field measuring device for the entire annular combustion chamber according to claim 2, characterized in that, The axis of the first mounting structure (311) passes through the center of the cavity height of the flame tube (220), and the axis of the second mounting structure (211) passes through the center of the cavity height of the flame tube (220), or through the axis of the annular combustion chamber (200), or through the center of the cavity height of the flame tube (220) and the axis of the annular combustion chamber (200).

4. The flow field measuring device for the entire annular combustion chamber according to claim 3, characterized in that, The first mounting structure (311) includes a first endoscope provided in the exhaust structure (300) and a sealing mounting seat installed in the first endoscope. The second mounting structure (211) includes a second endoscope provided in the outer casing (210) of the full-ring combustion chamber (200) and a sealing mounting seat installed in the second endoscope.

5. The flow field measuring device for the entire annular combustion chamber according to claim 4, characterized in that, The second mounting structure (211) includes a plurality of second endoscopic holes arranged along the airflow direction at circumferential positions corresponding to each of the air intake channels (130).

6. The flow field measuring device for the entire annular combustion chamber according to claim 3, characterized in that, The exhaust structure (300) has a contraction cone (310) and an exhaust pipe (320). The radial dimension of the large end of the contraction cone (310) matches and is connected to the radial dimension of the tail end of the full-ring combustion chamber (200). The exhaust pipe (320) is connected to the small end of the contraction cone (310). The first mounting structure (311) is disposed on the contraction cone (310).

7. The flow field measuring device for the entire annular combustion chamber according to claim 1, characterized in that, The air intake structure (100) has multiple tracer particle injection ports (110) arranged along the airflow direction at the positions corresponding to the positions of each air intake channel (130).

8. The flow field measuring device for the entire annular combustion chamber according to claim 1, characterized in that, The outer casing (210) of the full-ring combustion chamber (200) and the outer ring of the flame tube are respectively set as transparent structures, and the PIV measurement system is based on the high-energy sheet laser with a large divergence angle irradiating the head region of the full-ring combustion chamber.

9. A method for measuring the flow field in a full-annular combustion chamber, characterized in that, The application uses the flow field measuring device for the entire annular combustion chamber as described in any one of claims 2-6, wherein the measuring method includes: S1. Measurement preparation: Install the test specimen and measuring device, and connect the tracer particle generator, gas source, and measurement circuit. S2. Connect the camera to the camera endoscope, connect the laser to the laser endoscope, and run the PIV measurement system; S3. Start the test, adjust the tracer particle injection according to the test conditions to ensure that the measurement area has a suitable concentration of tracer particles, and adjust the tracer particle injection range until the flow field measurement in the entire annular combustion chamber is completed. S4. Conduct measurement experiments to obtain measurement data.

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