A flame tube flow field characteristic test piece

Abstract

The application belongs to the field of engine combustion chamber, and particularly relates to a flame tube flow field characteristic test piece. The combustion chamber casing comprises a combustion chamber casing upper side wall, a combustion chamber casing lower side wall, a combustion chamber casing left side wall and a combustion chamber casing right side wall, and the combustion chamber casing left side wall and the combustion chamber casing right side wall are both provided with observation windows; the flame tube is arranged in the combustion chamber casing, the head of the flame tube main body is connected with the flame tube upper side wall, the two ends of the flame tube upper side wall are respectively connected with the combustion chamber casing left side wall and the combustion chamber casing right side wall, there are two passages between the flame tube upper side wall and the combustion chamber casing upper side wall, the two ends of the flame tube lower side wall are respectively connected with the combustion chamber casing left side wall and the combustion chamber casing right side wall, there are two passages between the flame tube lower side wall and the combustion chamber casing lower side wall, and the exhaust pipe of the flame tube outlet is provided with an observation window; a plurality of laser sources are arranged at the corresponding observation windows.

Description

Technical Field

[0001] This application belongs to the field of engine combustion chambers, and specifically relates to a test piece for the flow field characteristics of a flame tube. Background Technology

[0002] The combustor is one of the core components of an aero-engine. A thorough understanding of the velocity distribution and variation within the combustor, especially the flame tube, is crucial for studying the air-fuel mixture formation and combustion process. Due to the complex airflow structure and high-temperature turbulent combustion environment within the flame tube, measuring the cold and hot velocity fields inside the combustor without disturbing the internal flow field is extremely difficult. Combustor test specimens equipped with optical testing capabilities provide an effective platform for acquiring information on the internal flow field, fuel distribution characteristics, temperature field, and overall combustion performance of the combustor.

[0003] Most current test specimens for the flow field characteristics of flame tubes are used to study cold flow fields or the fuel combustion flow fields of airflow in combustion chambers with simple structures. There are fewer tests on the combustion flow fields of kerosene / air in combustion chambers with complex shapes, and it is rare to be able to obtain multiple test data at the same time.

[0004] Therefore, there is an urgent need for a technical solution to overcome or mitigate at least one of the aforementioned defects in the existing technology. Summary of the Invention

[0005] The purpose of this application is to provide a test specimen for the flow field characteristics of a flame tube to solve at least one problem existing in the prior art.

[0006] The technical solution of this application is:

[0007] A test specimen for the flow field characteristics of a flame tube includes:

[0008] The combustion chamber casing includes an upper side wall, a lower side wall, a left side wall, and a right side wall. Observation windows are provided on both the left side wall and the right side wall.

[0009] A flame tube is disposed inside the combustion chamber housing. The flame tube includes a flame tube body, an upper flame tube wall, and a lower flame tube wall. The head of the flame tube body is connected to the upper flame tube wall. The two ends of the upper flame tube wall are respectively connected to the left and right sides of the combustion chamber housing. There are two channels between the upper flame tube wall and the upper side wall of the combustion chamber housing. The two ends of the lower flame tube wall are respectively connected to the left and right sides of the combustion chamber housing. There are two channels between the lower flame tube wall and the lower side wall of the combustion chamber housing. An observation window is provided on the exhaust pipe at the outlet of the flame tube.

[0010] The laser source includes multiple laser sources, each of which is respectively set at a corresponding observation window for performing optical testing of the flow field of the flame tube.

[0011] In at least one embodiment of this application, the observation window is made of quartz glass.

[0012] In at least one embodiment of this application, the observation window on the left side wall of the combustion chamber casing is disposed opposite to the observation window on the right side wall of the combustion chamber casing.

[0013] In at least one embodiment of this application, nitrogen flow paths are provided on the left side wall and the right side wall of the combustion chamber casing to achieve anti-fouling and heat protection for the observation window.

[0014] In at least one embodiment of this application, the height of the flame tube outlet passage is increased by setting the distance between the upper sidewall and the lower sidewall of the flame tube.

[0015] In at least one embodiment of this application, the flame tube flow field optical test includes PIV, PLIF, CARS, and TDLAS tests.

[0016] The invention has at least the following beneficial technical effects:

[0017] The flame tube flow field characteristic test piece of this application adopts a combustion chamber structure scheme in which the combustion chamber casing and the flame tube share a side wall, which solves problems such as test light source output, installation and sealing of observation window glass, and sealing of two-channel airflow; adopts a large field of view side wall observation window, which can realize all-round measurement of the main combustion zone; the nitrogen flow path design can realize the anti-fouling and thermal protection of the observation window; multiple observation positions can realize a variety of measurement techniques. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of a test specimen for the flow field characteristics of a flame tube according to one embodiment of this application;

[0019] Figure 2 This is a schematic diagram of the combustion chamber casing and the side wall of the flame tube of one embodiment of this application;

[0020] Figure 3 This is a schematic diagram of the double-sided observation windows of the combustion chamber casing according to one embodiment of this application;

[0021] Figure 4 This is a schematic diagram of a nitrogen flow path according to one embodiment of this application.

[0022] in:

[0023] 1-Combustion chamber casing; 2-Flame tube; 3-Laser source; 4-Observation window; 5-Dual channel; 6-Nitrogen flow path. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0025] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 application 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 the scope of protection of this application.

[0026] The following is in conjunction with the appendix Figures 1 to 4 This application will be described in further detail.

[0027] This application provides a test specimen for the flow field characteristics of a flame tube, such as Figure 1 As shown, it includes: combustion chamber casing 1, flame tube 2 and laser source 3.

[0028] Specifically, the combustion chamber casing 1 includes an upper side wall, a lower side wall, a left side wall, and a right side wall. Observation windows 4 are provided on both the left and right side walls of the combustion chamber casing for arranging the laser source 3.

[0029] The flame tube 2 is disposed inside the combustion chamber housing 1. The flame tube 2 includes a flame tube body, an upper side wall, and a lower side wall. The head of the flame tube body is connected to the upper side wall. The two ends of the upper side wall are connected to the left and right side walls of the combustion chamber housing, respectively. Two channels 5 are provided between the upper side wall and the upper side wall of the combustion chamber housing. The two ends of the lower side wall are connected to the left and right side walls of the combustion chamber housing, respectively. Two channels 5 are provided between the lower side wall and the lower side wall of the combustion chamber housing. An observation window 4 is provided on the exhaust pipe at the flame tube outlet for arranging the laser source 3. In the preferred embodiment of this application, the combustion chamber housing 1 and the flame tube 2 adopt a shared side wall design, such as... Figure 2 As shown, the left and right side walls of the flame tube 2 are eliminated. In order to maximize the measurement range, the height of the flame tube outlet passage is increased by setting the distance between the upper and lower side walls of the flame tube.

[0030] Multiple laser sources 3 are respectively positioned at corresponding observation windows 4 to perform optical testing of the flow field in the flame tube. Comprehensive three-dimensional measurement can be achieved by moving the laser sources 3. In a preferred embodiment of this application, the observation window 4 is made of quartz glass.

[0031] In the preferred embodiment of this application, such as Figure 3 As shown, the observation window on the left side wall of the combustion chamber casing is positioned opposite to the observation window 4 on the right side wall of the combustion chamber casing. Through the transverse light transmission design of the casing's two side walls, both sides can be used to arrange the laser source 3.

[0032] In the preferred embodiment of this application, such as Figure 4 As shown, the observation windows 4 made of quartz glass on the two side walls of the combustion chamber casing are designed to be anti-fouling and heat-protected. Nitrogen flow paths 6 are provided on the left and right side walls of the combustion chamber casing, and the high-pressure cold air in the nitrogen flow paths 6 achieves anti-fouling and heat protection for the observation windows 4.

[0033] The flame tube flow field characteristic test piece of this application can perform flame tube flow field optical tests including but not limited to PIV (Particle Image Velocimetry), PLIF (Planar Laser-Induced Fluorescence), CARS (Coherent Anti-Stokes Raman Scattering), and TDLAS (Tunable Diode Laser Absorption Spectroscopy).

[0034] The test piece for the flow field characteristics of the flame tube in this application has a quartz glass observation window 4 on the exhaust pipe facing the flame tube outlet for arranging the laser source 3. At the same time, to meet the measurement requirements of other testing technologies, the combustion chamber casing 1 adopts a transverse light-transmitting design. The combustion chamber casing 1 adopts a double-sided glass window design, and both sides can be used to arrange the laser source 3. The combustion chamber casing 1 and the flame tube 2 share the same side wall design. The flame tube 2 eliminates the left and right side walls and raises the height of the flame tube outlet passage, achieving full coverage from the head to the main combustion zone section. In order to prevent high-temperature gas from damaging the quartz glass observation window 4, and to blow away oil and tracer particles on the glass surface during the test, a high-pressure cold gas flow path is set inside the side wall of the combustion chamber casing 1. Considering that the oxygen introduced by the air will participate in the combustion, pure nitrogen is introduced during the test.

[0035] The flame tube flow field characteristic test specimen of this application has the following beneficial effects:

[0036] 1) The combustion chamber structure scheme in which the combustion chamber casing 1 and the flame tube 2 share the same side wall solves the problems of output of test laser source 3, installation and sealing of glass of observation window 4, and sealing of airflow in two channels 5;

[0037] 2) By adopting a large-view side wall observation window 4 and raising the height of the flame tube outlet passage, the light source output from the head to the mixing hole section is realized, thereby realizing all-round measurement of the main combustion zone;

[0038] 3) Nitrogen protection was provided for the side wall observation window 4, which solved the problems of thermal protection of quartz glass and surface contamination during the test, and ensured the smooth acquisition of parameters;

[0039] 4) It can perform tests using various measurement techniques (such as PIV, PLIF, CARS, TDLAS, etc.) and can acquire the cold and hot flow fields of the combustion chamber, the fuel distribution of important sections of the hot flow field, the two-dimensional OH concentration distribution of important sections, and the single-point temperature of important sections in one go.

[0040] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A test specimen for the flow field characteristics of a flame tube, characterized in that, include: Combustion chamber casing (1), the combustion chamber casing (1) includes an upper side wall of the combustion chamber casing, a lower side wall of the combustion chamber casing, a left side wall of the combustion chamber casing and a right side wall of the combustion chamber casing, and observation windows (4) are provided on the left side wall of the combustion chamber casing and the right side wall of the combustion chamber casing. Flame tube (2), the flame tube (2) is disposed inside the combustion chamber casing (1), the flame tube (2) includes a flame tube body, an upper side wall of the flame tube, and a lower side wall of the flame tube. The head of the flame tube body is connected to the upper side wall of the flame tube. The two ends of the upper side wall of the flame tube are respectively connected to the left side wall of the combustion chamber casing and the right side wall of the combustion chamber casing. There are two channels (5) between the upper side wall of the flame tube and the upper side wall of the combustion chamber casing. The two ends of the lower side wall of the flame tube are respectively connected to the left side wall of the combustion chamber casing and the right side wall of the combustion chamber casing. There are two channels (5) between the lower side wall of the flame tube and the lower side wall of the combustion chamber casing. An observation window (4) is provided on the exhaust pipe of the flame tube outlet. The laser source (3) includes multiple laser sources (3), which are respectively set at the corresponding observation window (4) for realizing optical testing of the flow field of the flame tube; The observation window on the left side wall of the combustion chamber casing is positioned opposite to the observation window (4) on the right side wall of the combustion chamber casing; The combustion chamber structure scheme in which the combustion chamber casing (1) and the flame tube (2) share the same side wall solves the problems of test laser source (3) output, installation and sealing of observation window (4) glass, and airflow sealing of two channels (5).

2. The test specimen for the flow field characteristics of a flame tube according to claim 1, characterized in that, The observation window (4) is made of quartz glass.

3. The test specimen for the flow field characteristics of a flame tube according to claim 1, characterized in that, Nitrogen flow paths (6) are provided on the left and right sides of the combustion chamber casing to prevent contamination and provide thermal protection for the observation window (4).

4. The test specimen for the flow field characteristics of a flame tube according to claim 1, characterized in that, The height of the flame tube outlet passage is increased by setting the distance between the upper sidewall and the lower sidewall of the flame tube.

5. The test specimen for the flow field characteristics of a flame tube according to claim 1, characterized in that, The flame tube flow field optical test includes PIV, PLIF, CARS, and TDLAS tests.

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