CN220982353U - Air flow measuring structure of gas generator - Google Patents
Air flow measuring structure of gas generator Download PDFInfo
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- CN220982353U CN220982353U CN202322488037.0U CN202322488037U CN220982353U CN 220982353 U CN220982353 U CN 220982353U CN 202322488037 U CN202322488037 U CN 202322488037U CN 220982353 U CN220982353 U CN 220982353U
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- air inlet
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- 238000005259 measurement Methods 0.000 claims abstract description 20
- 238000012360 testing method Methods 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 9
- 238000000926 separation method Methods 0.000 claims description 13
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 2
- 239000000523 sample Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011076 safety test Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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Abstract
The utility model belongs to the field of gas generator measurement equipment, and particularly relates to a gas generator air flow measurement structure, a rectifier, a holding ring, a wind needle, a mounting seat, a pressure taking pipe and differential pressure test equipment; the rectifier is arranged at the inlet of an air inlet pipe of the gas generator and comprises a rectifier grating, a frame and a silk screen, wherein the rectifier grating is made of honeycomb materials, a hexagonal channel is adopted, the silk screen is arranged in the middle of the rectifier grating, the frame is arranged in the air inlet pipe of the gas generator, and the rectifier grating is arranged on the frame; the holding ring is arranged on the rectifier, the air needle is arranged at the inlet of the air inlet pipe of the gas generator and is positioned at one side of the air inlet direction of the rectifier; compared with the prior art, the utility model has the following advantages: (1) compact structure, low free space requirement; (2) low-cost high-precision measurement; and (3) the process material is reliable and easy to copy.
Description
Technical Field
The utility model belongs to the field of gas generator measurement equipment, and particularly relates to a gas generator air flow measurement structure.
Background
The gas generator inlet flow is an important state parameter in gas turbine and aero-engine tests. By accurately measuring the air flow, the engine operating conditions can be analyzed, while compressor characteristics such as surge margin can be obtained, while fuel consumption, air-fuel ratio, etc. of engine combustion can be accurately obtained. The gas generator inlet air flow plays an important role in the design, development and test of gas turbines and aeroengines.
In practical application, there are three main modes of air flow measurement, namely a throttling differential pressure measurement method, an air inlet flow tube method and a speed profile measurement method. The mode of measuring differential pressure by the throttling method has larger air inlet pressure loss, which can influence the working standard of the gas generator and is unfavorable for the safety test of the gas generator. The air inlet flow tube method has strict requirements on the flow field outside the air inlet, needs to reserve a large free space, and also needs to accurately calibrate, so that the cost for calibrating the high flow of the gas generator is too high. In the method for measuring the section of the speed, a pitot tube constant speed test method is generally used for measuring the complete speed section of the section, more measuring points are needed, and a stable flow field is needed, and a long straight pipe section is needed, so that the method is difficult to implement.
In addition, there are other coupling measurement methods, such as providing a larger inlet channel, and then dividing the large inlet channel into several small channels to form a stable tube flow, but this requires a high construction cost, requires additional space and arranges multiple sets of measurement equipment.
Aiming at the measuring technology and the measuring device, the utility model aims to solve the problems that:
1. the space is compact; 2. low pressure loss; 3. low cost and high precision.
Disclosure of utility model
The utility model aims at the problems in the prior art, and specifically designs a special flow measurement structure which can be arranged in an air inlet of a gas generator, realizes measurement by using a very short measurement section, realizes that the pressure loss is far lower than the loss of differential pressure measured by a throttling method, is basically equivalent to the flow tube method, can realize the manufacture of a device by using low-cost technology and materials, and simultaneously keeps higher measurement precision.
In order to achieve the above purpose, the utility model provides an air flow measuring structure of a gas generator, which comprises a rectifier, a holding ring, a wind needle, a mounting seat, a pressure taking pipe and a differential pressure testing device;
The rectifier is arranged at the inlet of an air inlet pipe of the gas generator and comprises a rectifier grating, a frame and a silk screen, wherein the rectifier grating is made of honeycomb materials, a hexagonal channel is adopted, the silk screen is arranged in the middle of the rectifier grating, the frame is arranged in the air inlet pipe of the gas generator, and the rectifier grating is arranged on the frame;
The holding ring is arranged on the rectifier, the air needle is arranged at the inlet of the air inlet pipe of the gas generator and is positioned at one side of the air inlet direction of the rectifier.
By adopting the technical scheme, the air flow can be detected in the gas generator by utilizing a small space, the rectifier is provided with the rectification function, the free space requirement on the air inlet side of the external flow field is greatly reduced, and the air needle and the pressure taking tube can be used for realizing low-cost high-measurement-precision measurement.
Further, the mounting seat is arranged on the pipe wall of the gas generator gas inlet pipe, the air needle is arranged on the mounting seat in a penetrating manner, one end of the air needle is connected with the pressure taking pipe, and the other end of the air needle is connected with the differential pressure testing equipment.
By adopting the technical scheme, the air needle and the pressure taking pipe are connected to form the pitot tube, and the flow velocity of the air inlet pipe is conveniently and simply measured through the differential pressure test equipment.
Further, the frame comprises an inner frame, an outer frame and a separation frame, wherein the inner frame is concentric with the outer frame, the outer frame is connected with the inner frame through the separation frame, and an extension line of the separation frame passes through the circle center of the inner frame.
The separation frame evenly separates the circular ring area between the inner circular frame and the outer circular frame.
In summary, the air flow measuring mechanism of the gas generator has the following advantages and beneficial technical effects:
1. the measuring structure provided by the utility model has low requirements on an external flow field, the rectifier adopts a frame type structure and has a rectification function, the rectification gives consideration to pressure loss and structural reliability, and the free space requirement on the air inlet side of the external flow field is greatly reduced.
2. Compact structure, the straight tube section requires lowly. The flow meter can be directly connected with an air inlet, can be completed in the size of <1D under the condition that the air inlet caliber is D-1 m, and needs a front straight pipe with the length of 10D and a rear straight pipe with the length of 5D of a conventional flow meter, and the frame of the flow meter adopts an inner circle and an outer circle equipartition layout, so that the flow meter is compact in structure and high in measurement precision.
3. Reliable material and wide application. The whole equipment has no complex process parts, no complex sensors, simple processing, low cost and high precision measurement. The selected materials are all common materials in industry, and no special requirements such as composite materials and the like are met.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a general diagram of an air flow measurement arrangement of the present utility model;
FIG. 2 is a schematic view of a retaining ring and grid layout of the present utility model;
FIG. 3 is a cross-sectional view of the retaining ring A-A of the present utility model;
fig. 4 is a cross-sectional view of a retaining ring B-B of the present utility model.
The reference numerals in the drawings are:
1. a rectifier; 11. a rectifying gate; 12. a frame; 121. an inner circular frame; 122. an outer circular frame; 123. a separation frame; 13. a silk screen;
2. A holding ring; 3. a wind needle; 4. a mounting base; 5. a pressure taking tube; 6. differential pressure test equipment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present utility model become more apparent, the technical solutions in the embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings in the embodiments of the present utility model. In the drawings, like or similar reference numerals refer to like or similar elements throughout or elements having like or similar functions; the described embodiments are some, but not all, embodiments of the utility model; the embodiments described below, together with the words of orientation, are exemplary and intended to be used to explain the utility model and should not be taken as limiting the utility model; all other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model. Embodiments of the present utility model will be described in detail below with reference to the attached drawings:
[ example 1]
As shown in fig. 1 to 4, the present embodiment discloses a gas generator air flow rate measurement structure including: the device comprises a rectifier 1, a holding ring 2, a wind needle 3, a mounting seat 4, a pressure taking pipe 5 and a differential pressure testing device 6; the rectifier 1 is installed in gas generator's intake pipe entrance, including rectification bars 11, frame 12 and silk screen 13, rectification bars 11 are honeycomb material, adopt hexagon frame construction, and silk screen 13 is installed rectification bars 11 middle part, frame 12 are installed in gas generator's intake pipe, and rectification bars 11 are installed on frame 12, hold ring 2 and install on the rectifier 1, and wind needle 3 is installed at gas generator's intake pipe entrance, and is located one side of rectifier 1 air inlet direction, and mount pad 4 is installed on gas generator's intake pipe's pipe wall, and wind needle 3 runs through and installs on mount pad 4, and wind needle 3's one end is connected with getting pressure pipe 5, and its other end is connected with differential pressure test equipment 6.
Preferably, the frame 12 is formed by welding stainless steel sheet metal parts, wherein the wall thickness of the rectifying grid 11 is about 0.08mm, the aperture of the rectifying grid is 1.5mm, the screen 13 adopts a standard screen, the holding ring 2 adopts 304 stainless steel plates, the thickness of the holding ring 2 is 1.5-2mm, the width of the holding ring 2 is 5mm, the pressure taking pipe 5 adopts a plastic pipe, and the differential pressure testing equipment 6 adopts a U-shaped pipe differential pressure gauge.
Preferably, the frame 12 includes an inner frame 121, an outer frame 122 and a separation frame 123, the inner frame 121 is concentric with the outer frame 122, the outer frame 122 is connected with the inner frame 121 through the separation frame 123, an extension line of the separation frame 123 passes through the center of the inner frame 121, and the separation frame 123 uniformly separates the circular ring area between the inner frame 121 and the outer frame 122.
The working principle of the air flow measuring mechanism of the gas generator is as follows:
1. The air flow of the air inlet pipe is rectified by the rectifier 1 to form a frame integral structure, so that the test strength requirement is met.
2. The front end of the velocity measuring wind needle probe is positioned at the downstream of the rectifier 1, and according to the typical flow working condition of the gas generator: when the standard atmospheric pressure is 20 ℃ and the flow is 76kg/s, the flow rate in the channel is 83.6m/s, the Reynolds number Re is 5.44 multiplied by 106, the pressure loss Deltap1.5kpa, the drag removal coefficient is 0.25, the distance between the probe and the rectifier 1 is calculated to be 30-50 mm, the distance between the probe and the rectifier 1 is 30-50 mm, eight measuring points are uniformly arranged along the radial direction, and the axial speed distribution in the air inlet pipe of the gas generator is measured through the pressure taking pipe 5 and the differential pressure testing equipment 6;
3. According to the velocity distribution, volumetric flow is obtained by accumulating according to the area weight, air density is obtained by using the ambient temperature and pressure measuring equipment, and air flow of the gas generator is obtained by using mass flow = density x volumetric flow.
Finally, it should be pointed out that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting. Although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (4)
1. A gas generator air flow measurement structure, characterized in that: the device comprises a rectifier (1), a holding ring (2), a wind needle (3), a mounting seat (4), a pressure taking pipe (5) and a differential pressure test device (6);
The rectifier (1) is arranged at the inlet of an air inlet pipe of the gas generator, the rectifier (1) comprises a rectifier grating (11), a frame (12) and a silk screen (13), the rectifier grating (11) is made of honeycomb materials, a hexagonal frame structure is adopted, the silk screen (13) is arranged in the middle of the rectifier grating (11), the frame (12) is arranged in the air inlet pipe of the gas generator, and the rectifier grating (11) is arranged on the frame (12);
the holding ring (2) is arranged on the rectifier (1), and the air needle (3) is arranged at the inlet of the air inlet pipe of the gas generator and is positioned at one side of the air inlet direction of the rectifier (1).
2. The gas generator air flow measurement structure of claim 1, wherein: the mounting seat (4) is arranged on the pipe wall of the gas generator gas inlet pipe, the air needle (3) is arranged on the mounting seat (4) in a penetrating mode, one end of the air needle (3) is connected with the pressure taking pipe (5), and the other end of the air needle is connected with the differential pressure testing equipment (6).
3. The gas generator air flow measurement structure of claim 1, wherein: the frame (12) comprises an inner frame (121), an outer frame (122) and a separation frame (123), wherein the inner frame (121) is concentric with the outer frame (122), the outer frame (122) is connected with the inner frame (121) through the separation frame (123), and an extension line of the separation frame (123) passes through the circle center of the inner frame (121).
4. A gas generator air flow measurement structure according to claim 3, wherein: the separation frame (123) evenly separates the circular ring areas between the inner circular frame (121) and the outer circular frame (122).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322488037.0U CN220982353U (en) | 2023-09-13 | 2023-09-13 | Air flow measuring structure of gas generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322488037.0U CN220982353U (en) | 2023-09-13 | 2023-09-13 | Air flow measuring structure of gas generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220982353U true CN220982353U (en) | 2024-05-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322488037.0U Active CN220982353U (en) | 2023-09-13 | 2023-09-13 | Air flow measuring structure of gas generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220982353U (en) |
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2023
- 2023-09-13 CN CN202322488037.0U patent/CN220982353U/en active Active
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