CN114295316B - Suction type transonic plane blade grid test bed air inlet device - Google Patents
Suction type transonic plane blade grid test bed air inlet device Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 29
- 239000002245 particle Substances 0.000 claims abstract description 83
- 239000000700 radioactive tracer Substances 0.000 claims abstract description 44
- 239000000203 mixture Substances 0.000 claims description 5
- 101100234408 Danio rerio kif7 gene Proteins 0.000 claims description 3
- 101100221620 Drosophila melanogaster cos gene Proteins 0.000 claims description 3
- 101100398237 Xenopus tropicalis kif11 gene Proteins 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 2
- 238000012545 processing Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 238000013142 basic testing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000002441 reversible effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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Abstract
The invention discloses an air inlet device of a suction type transonic plane blade grid test bed, which comprises an air inlet front section, an air inlet middle section and an air inlet tail section, wherein the air inlet tail section is provided with an PIV trace particle dispenser, the transverse section of the PIV trace particle dispenser is provided with a windward side facing to air inlet and a leeward side facing away from the air inlet, the cross section curve of the windward side is an arc, the cross section curve of the leeward side is a structure which is gradually and backwardly reduced from two ends of the arc, and the end part of the reduced structure is provided with a particle dispensing outlet of the PIV trace particle dispenser; the three-section type structure is adopted, the assembly and the processing are simpler, meanwhile, the molded line structure of the PIV tracer particle dispenser is optimized, the rapid and uniform mixing of PIV tracer particles is realized, and the requirement of the suction type transonic plane blade grid wind tunnel on uniform inflow is ensured; the PIV tracer particle throwing device is well added into the suction type transonic plane blade grid test air inlet device on the premise of not changing the uniformity of the air inlet flow field, and the scheme has the advantages of simple structure, easiness in implementation and the like.
Description
Technical Field
The invention relates to a wind tunnel test device or a component, in particular to an air inlet device of a suction transonic plane blade grid test bed.
Background
The wind tunnel test bed is the most basic test equipment for aviation aircraft development and aerodynamic research. The plane blade cascade test bed is an important device for measuring aerodynamic performance and air film cooling performance of the turbine blade, and provides important test data for turbine blade design of an aeroengine.
In the prior art, the planar blade grid test device mainly adopts the traditional contact measurement technology to acquire blade grid inlet and outlet flow field information, and mainly acquires total static pressure of a certain point in the flow field through a pressure guiding hole and acquires the speed and direction of the certain point in the flow field through a porous probe. With the development of measurement technology, various optical non-contact measurement technologies are popular with scientific researchers because the optical non-contact measurement technologies hardly affect a flow field, and compared with the traditional single-point measurement technology, the optical measurement technology can acquire flow field information of the whole test section, such as an PIV tracer particle detection method, PIV tracer particles are put into a flow field, speed distribution information on a large number of space points can be recorded in the same transient state, and abundant flow field space structures and flow characteristics can be provided; because the tracer particles are put in the flow field and the putting device is needed, the flow field is influenced to a certain extent, and the final detection result is possibly influenced, the experimental air inlet device and the putting device are required to be designed and modified, and the influence on the final detection result caused by the PIV tracer particles is reduced or even eliminated as much as possible.
Therefore, the existing test air inlet device needs to be improved, the PIV tracer particle feeding device is arranged, and the flow field has no interference influence, so that the accuracy of a detection result is ensured.
Disclosure of Invention
In view of the above, the invention aims to provide an air inlet device of a suction transonic plane blade grid test bed, which is provided with a device for throwing PIV trace particles and has no interference influence on a flow field, so that the accuracy of a detection result is ensured.
The invention relates to an air inlet device of a suction type transonic plane blade grid test bed, which comprises an air inlet front section, an air inlet middle section and an air inlet tail section, wherein the air inlet tail section is provided with a PIV trace particle dispenser, the transverse section of the PIV trace particle dispenser is provided with a windward surface facing to air inlet and a leeward surface deviating from the air inlet, the cross section curve of the windward surface is an arc line, the cross section curve of the leeward surface is a structure which is gradually and backwardly reduced from the two ends of the arc line, and the end part of the reduced structure is provided with a particle throwing outlet of the PIV trace particle dispenser.
Further, the PIV trace particle dispenser is strip-shaped and transversely penetrates through the air inlet tail section along the air inlet tail section, and the windward side is a cambered surface formed by the arc lines; the particle delivery outlets are multiple and distributed along the length direction of the PIV tracer particle dispenser.
Further, the air inlet front section is of a horn mouth structure; the air inlet middle section is a round-square structure which is in transition from a round shape to a square shape, and the round-square structure is a flaring structure with a small front part and a big rear part; the air inlet tail section is a square flat section.
Further, the formula of the molded line of the longitudinal section of the air inlet front section is as follows: r is R 2 ＝a 2 cos2 alpha, (0.6D < a < 0.8D), D is the diameter of the bell mouth outlet, R is the radius of curvature of a certain point, and D is the included angle between the central axis and the connecting line between the certain point and the bell mouth starting point (inlet) on the same longitudinal section of the molded line; the line of the longitudinal section of the air inlet middle section is obtained by weighted average of front-to-back streamline tracking and rear-to-front streamline tracking.
Further, the cross section curve of the leeward surface is two quadratic curves which are gradually and backwardly reduced from two ends of the arc line, the end parts of the curved surfaces formed by the two quadratic curves are intersected in a plane, and a plurality of particle delivery outlets are distributed on the plane; the ratio of the diameter of the particle delivery outlet to the planar width is 0.3-0.6, and the open pore density is 10% -20%.
Further, the ratio of the cambered surface diameter of the windward side to the length of the air inlet tail section is not more than 0.1.
Further, the round-square structure is formed by connecting four straight guide lines which are uniformly distributed on the inlet circle of the air inlet middle section with four vertexes of the outlet square, and forming a continuous smooth curved surface between the adjacent straight guide lines.
Further, the ratio of the inlet area to the outlet area of the air inlet middle section is not less than 0.6, and the ratio of the projected length of the air inlet middle section along the air flow direction to the diameter of the inlet circle is not less than 1.2.
Further, the PIV trace particle dispenser comprises a strip-shaped body and a dispensing channel along the length direction of the strip-shaped body, wherein the particle dispensing outlet is communicated with the dispensing channel, and the dispensing inlet of the dispensing channel is positioned at the end part of the PIV trace particle dispenser.
Further, the air inlet tail section is provided with a mounting hole for penetrating and mounting the PIV trace particle dispenser; the difference between the pressure of the PIV tracer particle mixture introduced by the particle input inlet of the PIV tracer particle dispenser and the local atmospheric pressure is not more than 1kPa.
The invention has the beneficial effects that: the suction type transonic plane blade grid test bed air inlet device adopts a three-section structure, is simpler in assembly and processing, optimizes the molded line structure of the PIV tracer particle dispenser, realizes rapid and uniform mixing of PIV tracer particles, and ensures the requirement of a suction type transonic plane blade grid wind tunnel on uniform inflow; the PIV tracer particle throwing device is well added into the suction type transonic plane blade grid test air inlet device on the premise of not changing the uniformity of the air inlet flow field, and the scheme has the advantages of simple structure, easiness in implementation and the like.
Drawings
The invention is further described below with reference to the accompanying drawings and examples:
fig. 1 is a schematic three-dimensional structure of an air inlet device of a suction transonic plane cascade test bed.
Fig. 2 is a schematic view of a three-dimensional structure of an air intake bell.
Fig. 3 is a schematic diagram of a three-dimensional structure of the intake middle section.
Fig. 4 is a schematic three-dimensional structure of a PIV tracer particle dispenser.
Detailed Description
As shown in the figure, the suction type transonic plane cascade test bed air inlet device comprises an air inlet front section 101, an air inlet middle section 102 and an air inlet tail section 104, wherein the air inlet tail section 104 is provided with a PIV trace particle dispenser 103, the transverse section of the PIV trace particle dispenser 103 is provided with a windward side 4 facing to air inlet and a leeward side facing away from the air inlet, the cross section curve of the windward side is an arc, the cross section curve of the leeward side is a structure which is gradually and backwardly reduced from two ends of the arc, and the end part of the reduced structure is provided with a particle dispensing outlet 1 of the PIV trace particle dispenser; in the embodiment, the resistance is reduced and the fluid is guided to smoothly pass through the windward side of the cambered surface, and the leeward side adopts a gentle shrinking structure and is suitable for the flow of wind flow, so that larger turbulence is avoided;
the flow field of the plane blade cascade test device is established in a way that air is directly introduced into the atmosphere, an outlet is connected with a low-pressure air source, and the flow field is established through suction of the low-pressure air source, and the description is omitted.
In this embodiment, the PIV tracer particle dispenser 103 is strip-shaped and passes through the air inlet tail section 104 along the transverse direction of the air inlet tail section, and the windward side is a cambered surface formed by the arc; the particle delivery outlets 1 are plural and distributed along the length of the PIV tracer particle dispenser 103.
In this embodiment, the air inlet front section 101 has a bell mouth structure, the inner wall surface of the air inlet bell mouth is a pneumatic channel formed by a curve with smooth curvature and continuous, the air flow pressure is slowly reduced and the speed is slowly increased in the pneumatic channel, a uniform speed field is formed at the outlet, the bell mouth radius is selected according to the maximum air inlet flow, and the average speed of the bell mouth outlet is not more than 6m/s at maximum in practical test;
the air inlet middle section 102 is a round-square structure which is changed from round to square, and the round-square structure is a flaring structure with small front and big back; the air inlet tail section is a square flat section.
In this embodiment, the formula of the line of the longitudinal section of the air intake front section 101 is: r is R 2 ＝a 2 cos2 alpha, (0.6D is less than a is less than 0.8D), D is the diameter of a flare outlet, R is the radius of curvature of a certain point, and alpha is the included angle between the central axis and the connecting line between the certain point and the flare starting point (inlet) on the same longitudinal section of the molded line; in this embodiment, a=0.7d is preferably selected, and the profile of the longitudinal section of the intake middle section 102 is a profile obtained by weighted averaging of front-to-back streamline tracking and back-to-front streamline tracking.
In this embodiment, the cross section curve of the leeward surface is two conic curves gradually shrinking from two ends of the arc line to the rear, the end parts of the curved surfaces formed by the two conic curves intersect in a plane, and the particle delivery outlets 1 are distributed on the plane; the ratio of the diameter of the particle delivery outlet 1 to the plane width is 0.3-0.6, and the aperture density is 10% -20%; in the test, under the condition that the aperture is 1.5mm, when the ratio of the aperture to the plane width is 0.375, the optimal imaging effect can be obtained when the aperture density of the tracer particle putting hole is 15%; the aperture density of the tracer particle delivery outlet is the ratio of the diameter of the aperture to the distance between the centers of the two adjacent apertures.
As shown in fig. 4, the overall structure of the PIV tracer particle dispenser 103 is a circular hollow (dispensing channel 5), the windward side 4 in the gas flow field channel is a circular arc surface (the cross section is a circular arc line), the leeward side of the PIV tracer particle dispenser is a conic surface symmetrical left and right along the airflow direction, and the conic surface is tangent to the circle; the lee surface of the quadratic curve profile is intersected with a plane, PIV tracer particle throwing outlets 1 are uniformly distributed on the plane, the diameter is generally selected to be 0.8mm-2mm, the ratio of the throwing outlets to the aperture to the width of the plane is selected to be smaller as much as possible according to the processing technology cost, and therefore the bypass loss is further reduced.
In this embodiment, the ratio of the cambered surface diameter of the windward side to the length of the air inlet tail section is not greater than 0.1, and in the preferred scheme in the embodiment, the windward side is circular, the ratio of the circular diameter to the length of the supporting surface of the flat section supporting wall plate is not greater than 0.1, and the oversized diameter can cause the blockage of a flow field channel to form a local high-speed area, and also increases the airflow bypass tail area, so that the flat section is too long and the air inlet loss is increased.
In this embodiment, the round-square structure (the air inlet middle section 102) is formed by connecting four straight guide lines uniformly distributed on the inlet circle of the air inlet middle section 102 with four vertexes of the outlet square, and forming a continuous smooth curved surface between the adjacent straight guide lines; as shown in fig. 3, four straight guide lines are uniformly distributed on the inlet circle in the round-square structure of the preferred embodiment and are connected with four vertexes of the square shape of the outlet, a smooth continuous curved surface is formed by four closed curve modeling, the curved surface modeling adopts streamline tracking from the inlet to the outlet and streamline tracking from the outlet to the inlet for weighted average, and the round-square structure is connected with a bell mouth opening of the front section of the air inlet by adopting a flange plate.
In this embodiment, the ratio of the inlet area to the outlet area of the air inlet middle section 102 is not less than 0.6, and the ratio of the projected length of the air inlet middle section 102 along the air flow direction to the diameter of the inlet circle should be not less than 1.2; the inlet-outlet area ratio of the round-turn structure of the air inlet middle section is not less than 0.6 so as to ensure that the whole air flow channel of the round-turn section is expanded, so that the air flow can be further decelerated in the section, and meanwhile, as the section is a low-speed flow field, the expanded channel can form a reverse pressure gradient, so that the air flow is possibly separated seriously to influence the air flow quality, and therefore, the ratio of the projection length to the inlet round diameter along the air flow direction is not less than 1.2; the ratio of length to inlet diameter is as large as possible, given the space conditions and cost of the laboratory. .
In this embodiment, the PIV tracer particle dispenser 103 includes a strip-shaped body and a dispensing passage 5 along a length direction thereof, the particle dispensing outlet 1 is communicated with the dispensing passage 5, and the dispensing inlet 3 of the dispensing passage 5 is located at an end of the PIV tracer particle dispenser 103.
In this embodiment, the air inlet tail section 104 is provided with a mounting hole for penetrating and mounting the PIV tracer particle dispenser; the difference between the pressure of the PIV trace particle mixed gas introduced by the particle input inlet of the PIV trace particle dispenser and the local atmospheric pressure is not more than 1kPa; the air inlet tail section forms a rectangular air flow channel by a straight upper wall plate, a straight lower wall plate, a left wall plate assembly and a right wall plate assembly, and the surface roughness of the inner wall of the wall plate assembly is not higher than Ra1.6. In the figure, cam-type round holes are formed at reasonable positions of the upper wall plate and the lower wall plate, and a PIV trace particle dispenser is installed and fixed;
as shown in fig. 1, two opposite wall plates (an upper wall plate and a lower wall plate in the drawing) of the air inlet tail section 104 are provided with cam-type round holes (the shape of the cross section of the PIV tracer particle dispenser is the same as that of the PIV tracer particle dispenser), the PIV tracer particle dispenser is installed and fixed, and the tracer particle dispensing cross section is selected according to the PIV test laser shooting cross section, and is the middle cross section of the blade grid in the preferred embodiment;
the PIV tracer particle dispenser 103 is connected directly to the inlet tail section at both ends by threads (or other fastening means) and the laboratory should flow in from the lower end of the fluid path and out from the upper end. The difference between the pressure of the introduced tracer particle mixture and the local atmospheric pressure should be less than 1kPa to ensure that the tracer particle mixture does not form jet interference in the main flow channel. The length of the straight section should be not less than 1 time of the width of the PIV tracer particle dispenser in the fluid flow direction so as to ensure that the tracer particle mixture is evenly mixed with the main flow.
The natural air inlet horn mouth comprises an inlet circular radius, a horn mouth molded line, a circular-to-square transition section length, an inlet-outlet area ratio, particle delivery hole type of the PIV tracer particle dispenser, a cross section linear design, a straight section length, a wind tunnel shrinkage ratio and other important parameters, and therefore under the conditions of a simpler structure and lower cost, the linear structure of each section is reasonably designed and matched with the dispenser of a reasonable structure, interference is reduced, and accuracy of detection results is guaranteed.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (9)
1. An air inlet device of a suction type transonic plane cascade test bed is characterized in that: the PIV tracer particle dispenser comprises an air inlet front section, an air inlet middle section and an air inlet tail section, wherein the air inlet tail section is provided with a PIV tracer particle dispenser, the transverse section of the PIV tracer particle dispenser is provided with a windward surface facing to air inlet and a leeward surface facing away from the air inlet, the cross section curve of the windward surface is an arc, the cross section curve of the leeward surface is a structure which is gradually and backwardly reduced from the two ends of the arc, and the end part of the reduced structure is provided with a particle dispensing outlet of the PIV tracer particle dispenser;
the air inlet front section is of a horn mouth structure; the air inlet middle section is a round-square structure which is in transition from a round shape to a square shape, and the round-square structure is a flaring structure with a small front part and a big rear part;
the line formula of the longitudinal section of the air inlet front section is as follows: r is R 2 ＝a 2 cos2 alpha, 0.6D < a < 0.8D, D is the diameter of a bell mouth outlet, R is the curvature radius of any point of the molded line of the longitudinal section of the air inlet front section, and alpha is the included angle between the central axis and the connecting line between any point of the molded line of the longitudinal section of the air inlet front section and the bell mouth starting point on the same longitudinal section; the line of the longitudinal section of the air inlet middle section is obtained by weighted average of front-to-back streamline tracking and rear-to-front streamline tracking.
2. The suction transonic planar cascade test bench air intake apparatus of claim 1, wherein: the PIV trace particle dispenser is strip-shaped and transversely passes through the air inlet tail section along the air inlet tail section, and the windward side is a cambered surface formed by the arc lines; the particle delivery outlets are multiple and distributed along the length direction of the PIV tracer particle dispenser.
3. The suction transonic planar cascade test bench air intake apparatus of claim 1, wherein: the air inlet tail section is a square flat section.
4. The suction transonic planar cascade stand air intake apparatus of claim 2, wherein: the cross section curve of the leeward surface is two conic curves which are gradually reduced backwards from two ends of the arc line, the end parts of curved surfaces formed by the two conic curves are intersected in a plane, and a plurality of particle delivery outlets are distributed on the plane; the ratio of the diameter of the particle delivery outlet to the planar width is 0.3-0.6, and the open pore density is 10% -20%.
5. The suction transonic planar cascade test bench air intake apparatus of claim 4, wherein: the ratio of the cambered surface diameter of the windward side to the length of the air inlet tail section is not more than 0.1.
6. The suction transonic planar cascade test bench air intake apparatus of claim 4, wherein: the round-square structure is formed by connecting four straight guide lines which are uniformly distributed on the inlet circle of the air inlet middle section with four vertexes of the outlet square, and forming a continuous smooth curved surface between the adjacent straight guide lines.
7. The suction transonic planar cascade test bench air intake apparatus of claim 6, wherein: the ratio of the inlet area to the outlet area of the air inlet middle section is not less than 0.6, and the ratio of the projection length of the air inlet middle section along the air flow direction to the diameter of the inlet circle is not less than 1.2.
8. The suction transonic planar cascade test bench air intake apparatus of claim 4, wherein: the PIV tracer particle dispenser comprises a strip-shaped body and a dispensing passage along the length direction of the strip-shaped body, wherein a particle dispensing outlet is communicated with the dispensing passage, and a dispensing inlet of the dispensing passage is positioned at the end part of the PIV tracer particle dispenser.
9. The suction transonic planar cascade stand air intake apparatus of claim 8, wherein: the air inlet tail section is provided with a mounting hole for penetrating and mounting the PIV trace particle dispenser; the difference between the pressure of the PIV tracer particle mixture introduced by the particle input inlet of the PIV tracer particle dispenser and the local atmospheric pressure is not more than 1kPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111679015.1A CN114295316B (en) | 2021-12-31 | 2021-12-31 | Suction type transonic plane blade grid test bed air inlet device |
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| CN202111679015.1A CN114295316B (en) | 2021-12-31 | 2021-12-31 | Suction type transonic plane blade grid test bed air inlet device |
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| CN114295316A CN114295316A (en) | 2022-04-08 |
| CN114295316B true CN114295316B (en) | 2023-12-12 |
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| CN114295316A (en) | 2022-04-08 |
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