A TDLAS optical test window for high temperature and high pressure environment

Abstract

The application provides a TDLAS optical test window for a high-temperature and high-pressure environment, and belongs to the technical field of aero-engine test, which comprises a water-cooled gas pipeline, a mounting seat with a front-to-rear-through rectangular channel and a mounting groove communicating with the rectangular channel, the rectangular channel mounting the water-cooled gas pipeline, optical glass mounted in the mounting groove and provided with elastic protective gaskets on the side edges of the optical glass, the optical glass being limited by a gland fixed with the mounting seat, elastic sealing gaskets being arranged between the gland and the optical glass and between the optical glass and the mounting seat, wherein the optical glass and the mounting groove have a gap, the mounting seat is internally provided with a gas collecting cavity, the mounting seat is externally provided with an air inlet hole communicating with the gas collecting cavity, and the side of the mounting seat facing the optical glass is provided with two rows of cooling holes, cooling gas can flow out of the cooling holes after entering the gas collecting cavity through the air inlet hole, the cooling gas blows and cools the optical glass, and forms a gas seal in the gap.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of aero-engine test, and particularly relates to a TDLAS optical test window for a high-temperature and high-pressure environment. BACKGROUND

[0002] TDLAS (Tunable Diode Laser Absorption Spectroscopy) technology plays an important role in the temperature field test of an aero-engine combustion chamber outlet, and an optical test window is a key part affecting the success of the test. Especially under high-temperature and high-pressure environment conditions, problems such as observation window glass pollution, cracking, sealing failure and the like often occur, affecting the TDLAS test.

[0003] The existing optical test window structure mainly has two forms: one is a single-layer glass structure, which is pressed by a gland and sealed by a gasket; and the other is a double-layer glass structure, in which the inner layer glass bears temperature and the outer layer glass bears pressure. However, the current optical test window does not have a glass purging or cleaning function, the glass is easy to be polluted, affecting the test effect, and is generally applied to a gas pressure below 1 MPa. When the pressure is higher, the sealing effect is poor, the glass mounting seat is generally only water-cooled, the cooling area is limited, the mounting seat is easy to be thermally deformed, the glass is squeezed, the glass is cracked, the optical test and equipment safety are affected. SUMMARY

[0004] The application aims to provide a TDLAS optical test window for a high-temperature and high-pressure environment to solve or mitigate at least one problem in the background art.

[0005] The technical solution of the application is: a TDLAS optical test window for a high-temperature and high-pressure environment, comprising:

[0006] A water-cooled gas pipeline for passing high-temperature gas;

[0007] A mounting seat having a rectangular channel penetrating front and back and a mounting groove communicating with the rectangular channel, and the rectangular channel mounting the water-cooled gas pipeline;

[0008] An optical glass mounted in the mounting groove and provided with an elastic protective gasket on the side of the optical glass, the optical glass being limited by a gland fixed with the mounting seat, and an elastic sealing gasket being arranged between the gland and the optical glass and between the optical glass and the mounting seat;

[0009] The optical glass and the mounting groove have a gap therebetween, the mounting seat is internally provided with a gas collecting cavity, the mounting seat is externally provided with an air inlet hole communicating with the gas collecting cavity, and the mounting seat is provided on a side facing the optical glass with two rows of cooling holes, cooling gas is introduced through a cooling gas inlet pipe mounted at the air inlet hole and enters the gas collecting cavity and then flows out from the cooling holes, the cooling gas sweeps and cools the optical glass, and the cooling gas enters the gap to form a gas seal to protect the elastic protective gasket and / or the elastic sealing gasket.

[0010] In at least one embodiment of the present application, the water-cooled gas pipeline is a rectangular section pipeline, the side wall of the water-cooled gas pipeline is a sandwich structure, cooling water can flow through the sandwich structure, and the upper side and the lower side of the water-cooled gas pipeline are respectively provided with a cooling inlet and a cooling outlet communicating with the sandwich structure, cooling water flows into the sandwich structure from the cooling inlet and flows out from the cooling outlet.

[0011] In at least one embodiment of the present application, the mounting seat is a rectangular cross structure, the mounting grooves are four and are distributed on the four sides of the mounting seat, the mounting grooves are rectangular stepped grooves, and the shape of the optical glass is adapted to the mounting grooves.

[0012] In at least one embodiment of the present application, the middle part of the gland is provided with an observation port, and the shape of the observation port is adapted to the shape of the smaller end of the optical glass.

[0013] In at least one embodiment of the present application, the diameters of the cooling holes in the two rows of cooling holes near one side of the rectangular channel are greater than the diameters of the cooling holes away from the other side of the rectangular channel.

[0014] In at least one embodiment of the present application, the elastic sealing gasket and the elastic protective gasket are both made of graphite material.

[0015] In at least one embodiment of the present application, the cooling gas is nitrogen.

[0016] In at least one embodiment of the present application, a cooling water jacket is further included, the cooling water jacket is fixed on the outside of the mounting seat, a cooling channel is formed between the cooling water jacket and the side surface of the mounting seat, and the mounting seat is cooled.

[0017] The TDLAS optical test window for high temperature and high pressure environment provided by the present application can meet the TDLAS test requirements of the temperature field at the outlet of the combustion chamber of an aero-engine under high temperature and high pressure conditions, the inside of the optical glass can be prevented from being polluted by setting a cooling and sweeping function, the mounting seat can be cooled to reduce thermal deformation of the mounting seat, a sealing effect is provided, and the optical glass is stable and reliable. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to make the technical solutions provided by the present application clearer, the following will briefly introduce the drawings. Obviously, the drawings described below are only some embodiments of the present application.

[0019] Figure 1 Front view of the TDLAS optical test window for high temperature and high pressure environment of the present application.

[0020] Figure 2 A-A view schematic diagram based on the present application. Figure 1

[0021] Figure 3 Mounting seat schematic diagram of the present application.

[0022] Figure 4 B-B view schematic diagram based on the present application. Figure 3

[0023] Cooling hole schematic diagram in the present application. Figure 5

[0024] C-C view schematic diagram based on the present application. Figure 6 Figure 3 Reference signs:

[0025] 1- water-cooled gas pipeline, 11- cooling inlet, 12- cooling outlet

[0026] 2- mounting seat, 21- rectangular channel, 22- mounting groove, 23- gas collection cavity, 24- air inlet hole, 25- cooling hole

[0027] 3- optical glass

[0028] 4- elastic sealing gasket

[0029] 5- elastic protective gasket

[0030] 6- cooling water jacket

[0031] 7- cooling gas inlet pipe

[0032] 8- gland, 81- observation port DETAILED DESCRIPTION

[0033] In order to make the technical solutions provided by the present application clearer, the following will briefly introduce the drawings. Obviously, the drawings described below are only some embodiments of the present application.

[0034] In order to make the technical solutions provided by the present application clearer, the following will briefly introduce the drawings. Obviously, the drawings described below are only some embodiments of the present application.

[0035] In order to solve the problems that the inner side of the existing optical test window glass is easily contaminated, the sealing effect is poor under high pressure and high temperature conditions, the mounting seat is easily thermally deformed, and the glass is easily broken by extrusion, the present application provides a TDLAS optical test window for high temperature and high pressure environment.​​

[0036] As Figures 1 to 6 shown, the TDLAS optical test window for high temperature and high pressure environment provided by the present application comprises a water-cooled gas pipeline 1, a mounting seat 2, optical glass 3, an elastic sealing gasket 4, an elastic protective gasket 5, a cooling water jacket 6, a cooling gas inlet pipe 7 and a gland 8.

[0037] The water-cooled gas pipeline 1 is a rectangular section pipeline, the inside of the water-cooled gas pipeline 1 is connected to high pressure and high temperature gas, the side wall of the water-cooled gas pipeline 1 is a sandwich structure, the sandwich structure can flow cooling water, the upper side and the lower side of the water-cooled gas pipeline 1 are respectively provided with a cooling inlet 11 and a cooling outlet 12 which communicate with the sandwich structure, the cooling water flows in from the cooling inlet 11, flows through the sandwich structure, and flows out from the cooling outlet 12, so that the inner wall surface of the water-cooled gas pipeline 1 can be cooled.

[0038] The water-cooled gas pipeline 1 is mounted in front of and behind the mounting seat 2, and the water-cooled gas pipeline 1 can be fixed as a whole with the mounting seat 2 by welding, so that the cooling water at the rear end of the sandwich structure of the water-cooled gas pipeline 1 can also cool the front and back of the mounting seat 2.

[0039] The mounting seat 2 is a rectangular cross structure, which has a rectangular channel 21 penetrating front and back and at least one mounting groove 22 communicating with the rectangular channel 21, in the embodiment of the present application, the mounting groove 22 is four, which is arranged on the upper, lower, left and right four faces of the mounting seat 2, and the mounting groove 22 is a rectangular stepped groove. It can be understood that the mounting groove 22 can also be one or two, which is arranged on the side of TDLAS incidence. The rectangular channel 21 of the front and back of the mounting seat 2 is fixedly connected with the water-cooled gas pipeline 1, the mounting groove 22 of the upper, lower, left and right four faces of the mounting seat 2 is mounted with the optical glass 3, and the TDLAS can test the temperature field of the area of the rectangular channel 21 through the optical glass 3. Among them, the shape of the optical glass 3 is adapted to the shape of the mounting groove 22, that is, the optical glass 3 is a rectangular stepped structure, and there is a small gap between the optical glass 3 and the mounting groove 22 of the mounting seat 2. Exemplarily, the gap can be 1mm~3mm.

[0040] The interior of the mounting seat 2 is provided with a gas collecting cavity 23. In an example, the gas collecting cavity 23 is circular in cross section, and the gas collecting cavity 23 is formed along the length direction of the optical glass 3 (i.e. the axis direction of the water-cooled gas duct 1). The mounting seat 2 is provided with two rows of cooling holes 25 on the side (i.e. the inner side) facing the mounting of the optical glass 3, and the mounting seat 2 is provided with an air inlet hole 24, and the cooling air inlet pipe 7 is mounted at the air inlet hole 24. The cooling air enters the gas collecting cavity 23 through the four cooling air inlet pipes 7, and is sprayed out through the cooling holes 25. The cooling holes 25 near one side of the rectangular channel 21 are slightly larger in diameter, and the main function is to blow the inner side of the optical glass 3 to prevent unburned oil or carbon soot from polluting the optical glass 3, and also to cool the optical glass 3. The cooling holes 25 far from the rectangular channel 21 (i.e. the outer side) are slightly smaller in diameter, and the main function is to guide the cooling air into the gap between the mounting seat 2 and the optical glass 3 to form an air seal, thereby preventing the high-temperature gas from flowing along the gap to contact the outer gasket, thereby improving the sealing performance, and at the same time, the part of the cooling air can cool the mounting seat 2 body to reduce thermal deformation. In the preferred embodiment of the present application, the cooling air is nitrogen.

[0041] Further, in the present application, the axis of the cooling hole 25 and the center line of the gas collecting cavity 23 have a certain angle, so that the cooling air can have a certain angle when it is blown out from the cooling hole 25.

[0042] The optical glass 3 is surrounded by an elastic protective gasket 5, which prevents the optical glass 3 from directly contacting the mounting seat 2, protects the optical glass 3, and reduces the risk of breakage of the optical glass 3. The outer side and the inner side of the optical glass 3 are provided with an elastic sealing gasket 4, which is located between the gland 8 and the optical glass 3 and between the optical glass 3 and the mounting seat 2. The elastic sealing gasket 4 is mounted between the optical glass 3 and the gland 8 by tightening the gland 8 with bolts. The middle part of the gland 8 is provided with an observation port 81, and the shape and area of the observation port 81 are the same as the structure of the smaller end of the optical glass 3.

[0043] In some embodiments of the present application, the elastic sealing gasket 4 has a certain thickness, which can absorb part of the unevenness of the optical glass 3, the mounting seat 2 and the gland 8. In an example, the thickness of the elastic sealing gasket 4 is 1cm~2cm.

[0044] In the preferred embodiment of the present application, the elastic protective gasket 5 and the elastic sealing gasket 4 are made of high-temperature resistant material, for example, the high-temperature resistant material is graphite.

[0045] In the present application, the outer side of the mounting seat 2 is welded with a cooling water jacket 6, and the cooling water jacket 6 and the side surface of the mounting seat 2 form a cooling channel. By passing cooling water into the cooling channel to cool the mounting seat 2, the thermal deformation of the mounting seat 2 can be reduced, thereby reducing the risk of breakage of the optical glass 3, deformation of the sealing surface and gas leakage caused by extrusion of the optical glass 3.

[0046] The TDLAS optical test window for high temperature and high pressure environment provided by the application can meet the TDLAS test of the temperature field at the outlet of the combustion chamber of an aero-engine under high temperature and high pressure conditions, the inside of the optical glass can be prevented from being polluted through the setting of the cooling and blowing function, the mounting seat can be cooled to reduce the thermal deformation of the mounting seat, the sealing effect is provided, and the optical glass is stable and reliable.

[0047] The above is only a specific embodiment of the application, but the protection scope of the application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the application, which should be covered in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A TDLAS optical test window for high temperature high pressure environments, characterized in that, The utility model relates to a kind of water-cooled gas pipes and its installation seat, including: Water-cooled gas pipe (1) for passing into high-temperature gas; Mounting seat (2), the mounting seat (2) has front and rear through rectangular channel (21) and the installation groove (22) that communicates rectangular channel (21), and rectangular channel (21) installs water-cooled gas pipe (1); Optical glass (3), the optical glass (3) is installed in installation groove (22) and the side of optical glass (3) is equipped with elastic protective gasket (5), and optical glass (3) is limited by the gland (8) fixed with mounting seat (2), and elastic sealing gasket (4) is equipped between gland (8) and optical glass (3) and optical glass (3) and mounting seat (2); Wherein, the optical glass (3) and the installation groove (22) have gap, the mounting seat (2) is equipped with gas collection cavity (23) inside, the mounting seat (2) outside is equipped with the air inlet hole (24) that communicates gas collection cavity (23) and the mounting seat (2) side towards optical glass (3) is equipped with two rows of cooling hole (25), and cooling gas is passed into and enters gas collection cavity (23) after being passed into cooling gas by the cooling gas inlet pipe (7) installed at air inlet hole (24), and can flow out from the cooling hole (25), and the cooling gas is swept to the optical glass (3) while cooling the optical glass (3), and the cooling gas enters the gap and forms gas seal, protects the elastic protective gasket (5) and / or the elastic sealing gasket (4).

2. The TDLAS optical testing window for high temperature and high pressure environment of claim 1, wherein, The water-cooled gas pipe (1) is a rectangular cross-section pipe, the side wall of the water-cooled gas pipe (1) is a sandwich structure, cooling water can flow through the sandwich structure, the upper side and the lower side of the water-cooled gas pipe (1) are respectively provided with a cooling inlet (11) and a cooling outlet (12) communicating with the sandwich structure, cooling water flows into the sandwich structure from the cooling inlet (11) and flows out from the cooling outlet (12).

3. The TDLAS optical testing window for high temperature and high pressure environment of claim 2, wherein, The mounting seat (2) is a rectangular cross structure, the installation groove (22) is four and is distributed on the four faces of the mounting seat (2), the installation groove (22) is a rectangular stepped groove, and the shape of the optical glass (3) is adapted to the installation groove (22).

4. The TDLAS optical testing window for high temperature and high pressure environment of claim 3, wherein, The middle part of the gland (8) is provided with an observation port (81), and the shape of the observation port (81) is adapted to the shape of the smaller end of the optical glass (3).

5. The TDLAS optical testing window for high temperature and high pressure environment of claim 1, wherein, The diameters of the cooling holes (25) near the rectangular channel (21) side of the two rows of cooling holes (25) are greater than the diameters of the cooling holes (25) away from the rectangular channel (21) side.

6. The TDLAS optical testing window for high temperature and high pressure environment of claim 1, wherein, The elastic sealing gasket (4) and the elastic protective gasket (5) are both made of graphite material.

7. The TDLAS optical testing window for high temperature and high pressure environment of claim 1, wherein, The cooling gas is nitrogen.

8. The TDLAS optical testing window for high temperature and high pressure environment of claim 1, wherein, Further comprising a cooling water jacket (6), the cooling water jacket (6) is fixed on the outside of the mounting seat (2), and a cooling channel is formed between the cooling water jacket (6) and the side of the mounting seat (2) for cooling the mounting seat (2).

Images