CN111141524A - Measuring device for measuring combustion field gas parameters - Google Patents
Measuring device for measuring combustion field gas parameters Download PDFInfo
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- CN111141524A CN111141524A CN201911218891.7A CN201911218891A CN111141524A CN 111141524 A CN111141524 A CN 111141524A CN 201911218891 A CN201911218891 A CN 201911218891A CN 111141524 A CN111141524 A CN 111141524A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
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Abstract
The invention discloses a measuring device for measuring combustion field gas parameters, belongs to the technical field of flow field optical measurement, and can solve the problem of poor measuring result caused by insufficient light distribution quantity in a flow field in the prior art. The measuring device includes: a measuring ring; each laser emitting unit corresponds to each laser receiving unit group, and the corresponding laser emitting unit and the corresponding laser receiving unit group are respectively arranged on two opposite side walls of the measuring ring; each laser receiving unit group comprises a plurality of laser receiving units arranged in rows; each single mode fiber corresponds to each laser emission unit; each first multimode fiber corresponds to each laser receiving unit; the single mode fiber outputs a laser beam to the laser emission unit; the laser emitting unit converts the laser beam into a fan-shaped beam, and the laser receiving unit converges and couples the fan-shaped beam irradiated thereon into the first multimode optical fiber corresponding thereto. The invention is used for measuring the gas parameters of the flow field.
Description
Technical Field
The invention relates to a measuring device for measuring combustion field gas parameters, and belongs to the technical field of flow field optical measurement.
Background
Measurement of engine combustion flow field parameters is of great significance for engine performance assessment. The combustion flow field products are measured by adopting an optical means, so that the damage to the flow field can be avoided, and the measurement accuracy is improved. Tunable semiconductor Laser Absorption Spectroscopy (TDLAS) is an on-line measurement technique that has been widely used in recent years in diagnostic studies of combustion and propulsion flow fields. The optical measurement part of the TDLAS measurement system mainly utilizes a discrete optical probe to project light rays in the engine to measure optical data, but due to the limitation of the size of the engine, more discrete optical probes cannot be arranged in the engine, so that the quantity of light rays distributed in a flow field is limited, high-resolution flow field information is difficult to obtain, and the measurement result is poor.
Disclosure of Invention
The invention provides a measuring device for measuring combustion field gas parameters, which can solve the problem of poor measuring results caused by insufficient light distribution quantity in a flow field in the prior art.
The invention provides a measuring device for measuring combustion field gas parameters, comprising: the measuring ring is provided with an inlet for the flow field to be measured to enter and an outlet for the flow field to be measured to flow out; a plurality of laser emitting units and a plurality of laser receiving unit groups; each laser emitting unit corresponds to each laser receiving unit group, and the corresponding laser emitting unit and the corresponding laser receiving unit group are respectively arranged on two opposite side walls of the measuring ring; each laser receiving unit group comprises a plurality of laser receiving units arranged in rows; a plurality of single mode fibers and a plurality of first multimode fibers; each single mode fiber corresponds to each laser emission unit; each first multimode optical fiber corresponds to each laser receiving unit; the single mode fiber is used for outputting laser beams to the laser emission unit; the laser emitting unit is used for converting the laser beam into a fan-shaped beam, and the laser receiving unit is used for converging and coupling the fan-shaped beam irradiated on the laser receiving unit into a first multimode optical fiber corresponding to the fan-shaped beam.
Optionally, the first multimode optical fiber corresponding to each laser emitting unit group forms a first multimode optical fiber group; the measuring device also comprises an optical fiber combiner and a plurality of second multimode optical fibers; the optical fiber combiner is used for coupling each first multimode optical fiber in each first multimode optical fiber group into the same second multimode optical fiber.
Optionally, the measuring ring has two pairs of opposing sidewalls; and two laser emitting units and two laser receiving unit groups are arranged on each side wall.
Optionally, the measuring ring further comprises a housing disposed around the periphery of the sidewall, and a sealing cover for closing an area surrounded by the housing; and the sealing cover is provided with openings corresponding to the inlet and the outlet.
Optionally, the measuring device further comprises an inert gas channel; the inert gas channel is used for conveying inert gas to the area enclosed by the side wall and the shell.
Optionally, a preset gap exists between the sealing cover and the side wall, and a heat insulation buffer material is filled in the preset gap.
Optionally, the gap between the side wall and the outer shell is filled with the thermal insulation buffer material.
Optionally, the heat-insulating buffer material is heat-insulating asbestos.
Optionally, the measuring apparatus further includes an optical fiber transmission cable, and the optical fiber transmission cable is configured to package the single-mode optical fiber and the first multimode optical fiber and transmit the packaged single-mode optical fiber and the first multimode optical fiber to the optical fiber combiner.
Optionally, the measuring device further includes a base disposed at the bottom of the housing, and the base is configured to support the measuring ring.
The invention can produce the beneficial effects that:
1) according to the measuring device provided by the invention, the laser emitting unit and the laser receiving unit group are respectively arranged on the opposite side walls of the measuring ring, the laser beams output by the single-mode optical fibers are converted into fan-shaped beams through the laser emitting unit, after the fan-shaped beams pass through the flow field, the laser receiving units in the laser receiving unit group carry out beam splitting and coupling on the fan-shaped beams, and the divergent fan-shaped beams are focused and coupled into the corresponding first multimode optical fibers. In the invention, because the light passing through the flow field is a fan-shaped light beam, the distribution quantity and the coverage range of the light in the flow field are greatly improved, more measurement information is provided for the TDLAS, and higher reconstruction resolution and better reconstruction quality can be obtained. Meanwhile, the laser beam in the measuring device is transmitted into the measured flow field by the single-mode fiber, and is received by the multi-mode fiber after passing through the measured flow field. In addition, the size of the measuring ring can be flexibly changed according to the sizes of different measured flow fields, so that the application range of the measuring device is expanded.
2) According to the measuring device provided by the invention, the optical fiber combiner and the plurality of second multimode optical fibers are arranged, and the optical fiber combiner is used for coupling the first multimode optical fibers belonging to different groups into the same second multimode optical fiber, so that the laser receiving end can use less optical fibers to finish the transmission of laser, and the optical fiber structure of the laser output end is simplified.
Drawings
FIG. 1 is a schematic diagram of a measurement ring structure according to an embodiment of the present invention;
fig. 2 is a first schematic structural diagram of a measurement apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a measurement apparatus according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to examples, but the present invention is not limited to these examples.
An embodiment of the present invention provides a measurement apparatus for measuring a combustion field gas parameter, which is shown in fig. 1 to 3, and includes: a measuring ring 10, the measuring ring 10 having an inlet for the flow field 14 to be measured to enter and an outlet for the flow field to be measured to exit; a plurality of laser emitting units 11 and a plurality of laser receiving unit groups; each laser emitting unit 11 corresponds to each laser receiving unit group, and the corresponding laser emitting unit 11 and the corresponding laser receiving unit group are respectively arranged on two opposite side walls of the measuring ring 10; each laser receiving unit group includes a plurality of laser receiving units 12 arranged in a row; a plurality of single mode fibers 13 and a plurality of first multimode fibers; each single mode fiber 13 corresponds to each laser emitting unit 11; each first multimode fiber corresponds to each laser receiving unit 12; the single mode fiber 13 is used to output a laser beam to the laser emitting unit 11; the laser emitting unit 11 is used for converting the laser beam into a fan-shaped beam, and the laser receiving unit 12 is used for converging and coupling the fan-shaped beam irradiated on the laser receiving unit into a first multimode optical fiber corresponding to the fan-shaped beam.
The measuring device provided by the embodiment of the invention can be applied to two-dimensional distribution measurement of the temperature and component concentration of the combustion flow field of a scramjet engine, a detonation engine, an aeroengine and the like.
Referring to fig. 1 to 3, laser emitted by a laser is transmitted to a laser emitting unit 11 through a single mode fiber 13, the laser emitting unit 11 converts a point light source into a fan-shaped light beam, and the fan-shaped light beam is received by a laser receiving unit 12 after passing through a measured flow field 14; the laser receiving unit 12 converges and transmits the received laser into a first multimode optical fiber; the specific structures of the laser emitting unit 11 and the laser receiving unit 12 are not limited in the embodiment of the present invention, and those skilled in the art can design the structures according to the functions implemented by the laser emitting unit 11 and the laser receiving unit 12.
The embodiment of the invention does not limit the setting number of the laser receiving units 12, and in practical application, the more the setting number of the laser receiving units 12 is, the better the setting number is, so that more measurement data can be obtained, and the reconstruction resolution ratio is favorably improved. In practical application, the minimum interval between adjacent laser receiving units 12 can be set to be 5mm, so that more laser receiving units 12 can be arranged in the engine flow field with limited space to receive fan-shaped light, more measurement data can be obtained, and the reconstruction resolution is improved.
According to the measuring device provided by the invention, the laser emitting unit 11 and the laser receiving unit group are respectively arranged on the opposite side walls of the measuring ring 10, the laser beam output by the single mode fiber 13 is converted into the fan-shaped beam through the laser emitting unit 11, after the fan-shaped beam passes through the flow field, the laser receiving unit 12 in the laser receiving unit group divides and couples the fan-shaped beam, and the divergent fan-shaped beam is focused and coupled into the corresponding first multimode fiber. In the invention, because the light passing through the flow field is a fan-shaped light beam, the distribution quantity and the coverage range of the light in the flow field are greatly improved, more measurement information is provided for the TDLAS, and higher reconstruction resolution and better reconstruction quality can be obtained. Meanwhile, in the measuring device, the laser beam is transmitted into the measured flow field through the single-mode fiber 13, and is received by the multi-mode fiber after passing through the measured flow field. In addition, the size of the measuring ring 10 can be flexibly changed according to the size of different measured flow fields, so that the application range of the measuring device is expanded.
Further, the measuring ring 10 has two pairs of opposite side walls; two laser emitting units 11 and two laser receiving unit groups are arranged on each side wall.
Referring to fig. 1, the laser transceiver module is a double-layer rectangular structure, and each layer of the structure may be provided with 4 laser transmitter units 11, so that the whole measuring apparatus may be provided with 8 laser transmitter units 11, and the two laser transmitter units 11 on each side wall of the measuring ring 10 may be arranged diagonally or respectively close to opposite sides; the interval of each laser receiving unit 12 can be 5mm, so that the two-dimensional reconstruction measurement of the gas parameters with the minimum spatial resolution of 5mm multiplied by 5mm can be realized, thereby projecting light rays as much as possible in a limited space, and further ensuring that the reconstruction resolution obtained by measurement by using the measuring device is high and the reconstruction quality is good.
Referring to fig. 2, the first multimode fibers corresponding to each laser emitting unit group form a first multimode fiber group; the measuring device also comprises an optical fiber combiner 15 and a plurality of second multimode optical fibers 16; the optical fiber combiner 15 is configured to couple a respective first multimode optical fiber in each first multimode optical fiber group into a same second multimode optical fiber 16. Further, the measuring device further comprises an optical fiber transmission cable 20, and the optical fiber transmission cable 20 is used for packaging the single-mode optical fiber 13 and the first multimode optical fiber and then transmitting the packaged single-mode optical fiber and the first multimode optical fiber to the optical fiber combiner 15.
In practical application, the single-mode optical fiber 13 and the first multimode optical fiber are provided with outer cladding layers, and all the optical fibers are packaged into the optical fiber transmission cable 20 packaged by the armored cable after being gathered; the optical fiber combiner 15 can be an optical fiber combining flange, and can couple 8 first multimode optical fibers with 400 μm core diameters into a second multimode optical fiber 16 with 800 μm core diameters by adopting an 8-in-1 coupling mode; the tail part of the optical fiber combiner is provided with a plurality of 800-micrometer core diameter second multimode optical fibers 16 and 8 single mode optical fibers, the first multimode optical fiber adopts an SMA interface, and the single mode optical fiber 13 adopts an FC/APC interface. By arranging the plurality of optical fiber beam combiners 15 and the plurality of second multimode optical fibers 16, the optical fiber beam combiner 15 is utilized to couple the first multimode optical fibers belonging to different groups into the same second multimode optical fiber 16, so that the laser receiving end can use less optical fibers to complete the transmission of laser, and the optical fiber structure of the laser output end is simplified.
Further, referring to fig. 1 and 3, the measuring ring 10 further includes a housing 17 disposed around the periphery of the sidewall, and a sealing cover 18 for closing an area surrounded by the housing 17; the sealing cover 18 is provided with openings corresponding to the inlet and outlet. The seal cover 18 is used for sealing the inside of the measurement ring. A preset gap exists between the sealing cover 18 and the side wall of the measuring ring 10, and the preset gap is filled with a heat insulation buffer material. The embodiment of the present invention does not limit the specific material of the thermal insulation buffer material, and for example, the thermal insulation buffer material may be thermal insulation asbestos.
In practical application, a gap of 0.5mm can be set between the sealing cover 18 and the top end and the lower end of the side wall of the measuring ring 10 to serve as a buffer area, and a heat insulation buffer material is filled in the buffer area, so that the optical device is prevented from being damaged due to the fact that the sealing cover 18 directly contacts with the optical device on the side wall or extrudes the optical device; while also avoiding heat in the flow field from impinging on the optics. Preferably, the gap between the side wall of the measuring ring 10 and the housing 17 may be filled with the thermal insulation buffer material to further reduce the effect of heat generated by engine combustion on the optical device.
Referring to fig. 2, the measuring device may further include an inert gas passage 19; the inert gas channel 19 is used to deliver inert gas to the area enclosed by the side wall and the housing 17. The embodiment of the present invention is not limited to a specific type of the inert gas to be delivered, and the inert gas may be, for example, nitrogen. By supplying inert gas to the area enclosed by the side wall of the measuring ring 10 and the housing 17 through the inert gas channel 19, the influence of the external ambient gas on the measuring result can be reduced.
In order to fix the measuring ring 10 to the engine to be measured, a positioning groove may be provided at the flow field inlet end of the measuring ring 10 to connect with the outlet of the engine combustion chamber. For better fixing and supporting the measuring ring 10, a base 21 may be provided at the bottom of the housing 17 and a hanging ring 22 may be provided at the top of the housing 17.
The measuring device provided by the invention works in the combustion flow field environment of an engine, and the working process is as follows: firstly, laser emitted by an external laser is received through FC-APC interfaces of 8 single-mode fibers 13, the single-mode fibers 13 transmit the laser to a laser emitting unit 11, the laser emitting unit 11 converts a point light source into a fan-shaped light beam, the fan-shaped light beam penetrates through a channel of a measured flow field 14 and is received by a laser receiving unit 12, the laser receiving unit 12 converges and transmits the received laser to a first multimode fiber, the first multimode fiber and the single-mode fibers 13 are transmitted to an optical fiber combiner 15 through an armored optical fiber transmission cable 20, and the optical fiber combiner 15 couples the 8 first multimode fibers with 400 mu m core diameters into a second multimode fiber 16 with 800 mu m core diameters in an 8-to-1 coupling mode; the second multimode optical fibre 16 transmits the measured optical signal to an external detection device.
Although the present application has been described with reference to a few embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application as defined by the appended claims.
Claims (10)
1. A measuring device for combustion field gas parameter measurement, the measuring device comprising:
the measuring ring is provided with an inlet for the flow field to be measured to enter and an outlet for the flow field to be measured to flow out;
a plurality of laser emitting units and a plurality of laser receiving unit groups; each laser emitting unit corresponds to each laser receiving unit group, and the corresponding laser emitting unit and the corresponding laser receiving unit group are respectively arranged on two opposite side walls of the measuring ring; each laser receiving unit group comprises a plurality of laser receiving units arranged in rows;
a plurality of single mode fibers and a plurality of first multimode fibers; each single mode fiber corresponds to each laser emission unit; each first multimode optical fiber corresponds to each laser receiving unit;
the single mode fiber is used for outputting laser beams to the laser emission unit; the laser emitting unit is used for converting the laser beam into a fan-shaped beam, and the laser receiving unit is used for converging and coupling the fan-shaped beam irradiated on the laser receiving unit into a first multimode optical fiber corresponding to the fan-shaped beam.
2. The measuring device according to claim 1, wherein the first multimode optical fiber corresponding to each laser emitting unit group constitutes a first multimode optical fiber group;
the measuring device also comprises an optical fiber combiner and a plurality of second multimode optical fibers; the optical fiber combiner is used for coupling each first multimode optical fiber in each first multimode optical fiber group into the same second multimode optical fiber.
3. The measurement device of claim 1, wherein the measurement ring has two pairs of opposing sidewalls; and two laser emitting units and two laser receiving unit groups are arranged on each side wall.
4. The measuring device of claim 1, wherein the measuring ring further comprises a housing disposed around the periphery of the sidewall, and a sealing cover for closing an area surrounded by the housing;
and the sealing cover is provided with openings corresponding to the inlet and the outlet.
5. The measurement device of claim 4, further comprising an inert gas channel; the inert gas channel is used for conveying inert gas to the area enclosed by the side wall and the shell.
6. The measuring device of claim 4, wherein a predetermined gap exists between the sealing cover and the sidewall, and the predetermined gap is filled with a thermally insulating buffer material.
7. A measuring device according to claim 6, wherein the gap between the side wall and the housing is filled with the thermally insulating buffer material.
8. A measuring device according to claim 6 or 7, characterised in that the thermally insulating and cushioning material is thermally insulating asbestos.
9. The measurement device of claim 2, further comprising a fiber optic transmission cable for packaging the single mode fiber and the first multimode fiber for transmission to the fiber combiner.
10. The measurement device of claim 4, further comprising a base disposed at a bottom of the housing, the base for supporting the measurement ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911218891.7A CN111141524A (en) | 2019-12-02 | 2019-12-02 | Measuring device for measuring combustion field gas parameters |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911218891.7A CN111141524A (en) | 2019-12-02 | 2019-12-02 | Measuring device for measuring combustion field gas parameters |
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| CN111141524A true CN111141524A (en) | 2020-05-12 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011143240A1 (en) * | 2010-05-10 | 2011-11-17 | Zolo Technologies, Inc. | Time-synchronized tdlas measurements of pressure and temperature in a gas turbine engine |
| CN105043589A (en) * | 2015-07-13 | 2015-11-11 | 天津津航技术物理研究所 | TDLAS gas temperature measurement detection method based on beam expanding and focusing system |
| CN106017725A (en) * | 2016-05-26 | 2016-10-12 | 中国人民解放军装备学院 | Measuring device suitable for two-dimensional reconstruction of combustion flow field gas |
| CN106815878A (en) * | 2015-12-02 | 2017-06-09 | 北京航空航天大学 | A kind of image rebuilding method based on the multispectral tomography of various visual angles |
| CN206292160U (en) * | 2016-12-20 | 2017-06-30 | 中国科学院工程热物理研究所 | The system that the temperature and component of aeroplane engine tail gas are measured simultaneously |
-
2019
- 2019-12-02 CN CN201911218891.7A patent/CN111141524A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011143240A1 (en) * | 2010-05-10 | 2011-11-17 | Zolo Technologies, Inc. | Time-synchronized tdlas measurements of pressure and temperature in a gas turbine engine |
| CN105043589A (en) * | 2015-07-13 | 2015-11-11 | 天津津航技术物理研究所 | TDLAS gas temperature measurement detection method based on beam expanding and focusing system |
| CN106815878A (en) * | 2015-12-02 | 2017-06-09 | 北京航空航天大学 | A kind of image rebuilding method based on the multispectral tomography of various visual angles |
| CN106017725A (en) * | 2016-05-26 | 2016-10-12 | 中国人民解放军装备学院 | Measuring device suitable for two-dimensional reconstruction of combustion flow field gas |
| CN206292160U (en) * | 2016-12-20 | 2017-06-30 | 中国科学院工程热物理研究所 | The system that the temperature and component of aeroplane engine tail gas are measured simultaneously |
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Application publication date: 20200512 |