CN114295316A - Suction type transonic velocity plane cascade test bed air inlet device - Google Patents
Suction type transonic velocity plane cascade test bed air inlet device Download PDFInfo
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- CN114295316A CN114295316A CN202111679015.1A CN202111679015A CN114295316A CN 114295316 A CN114295316 A CN 114295316A CN 202111679015 A CN202111679015 A CN 202111679015A CN 114295316 A CN114295316 A CN 114295316A
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- 239000002245 particle Substances 0.000 claims abstract description 81
- 239000000700 radioactive tracer Substances 0.000 claims abstract description 49
- 230000007704 transition Effects 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000012935 Averaging Methods 0.000 claims description 2
- 230000006698 induction Effects 0.000 claims 8
- 238000012545 processing Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
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- 238000010586 diagram Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
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- 238000013100 final test Methods 0.000 description 2
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- 230000008569 process Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000013142 basic testing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000011148 porous material Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
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Abstract
The invention discloses a suction type transonic plane cascade test bed air inlet device, 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 tracer particle dispenser, a transverse section of the PIV tracer particle dispenser is provided with a windward side facing the incoming direction of inlet air and a leeward side deviating from the incoming direction of the inlet air, the curve of the cross section of the windward side is an arc line, the curve of the cross section of the leeward side is a structure gradually reduced backwards from two ends of the arc line, and the end part of the reduced structure is provided with a particle discharge outlet of the PIV tracer particle dispenser; the invention adopts a three-section structure, the assembly and the processing are both simpler, and simultaneously, 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 velocity plane cascade wind tunnel on uniform incoming flow is ensured; the PIV tracer particle feeding device is added into the suction type transonic velocity plane blade grid test air inlet device on the premise of not changing the uniformity of an 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 a suction type transonic velocity plane cascade test bed air inlet device.
Background
The wind tunnel test stand is the most basic test equipment for the development of aerospace vehicles and the aerodynamic research. The plane cascade test bed is an important device for measuring the aerodynamic performance and the air film cooling performance of the turbine blade, and provides important test data for the design of the turbine blade of the aero-engine.
In the prior art, a planar cascade test device mainly adopts a traditional contact measurement technology to obtain flow field information of an inlet and an outlet of a cascade, and mainly obtains the total static pressure of a certain point in the flow field through a pressure guide hole and 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 more and more favored by 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, for example, a PIV trace particle detection method is adopted, PIV trace particles are put in the flow field, velocity distribution information on a large number of space points can be recorded in the same transient state, and rich flow field space structures and flow characteristics can be provided; because put in the flow field spike particle and need put in the device, then can cause certain influence to the flow field, therefore probably influence final testing result, consequently, need carry out the design transformation to experiment air inlet unit and put in the device, minimize or even eliminate because the influence to final testing result that drops in PIV spike particle and lead to.
Therefore, there is a need for an improvement to existing experimental gas inlet devices, which have a device for feeding PIV trace particles and do not have interfering influence on the flow field itself, thereby ensuring the accuracy of the detection result.
Disclosure of Invention
In view of this, the invention aims to provide an air inlet device of a suction-type transonic velocity plane cascade test bed, which is provided with a device for throwing PIV tracer particles and has no interference influence on a flow field, so that the accuracy of a detection result is ensured.
The invention discloses a suction type transonic plane cascade test bed air inlet device which comprises an air inlet front section, an air inlet middle section and an air inlet tail section, wherein a PIV tracer particle dispenser is arranged on the air inlet tail section, a windward surface facing the incoming direction of inlet air and a leeward surface facing away from the incoming direction of the inlet air are arranged on the transverse section of the PIV tracer particle dispenser, the cross section curve of the windward surface is an arc line, the cross section curve of the leeward surface is a structure gradually reduced backwards from two ends of the arc line, and a particle dispensing outlet of the PIV tracer particle dispenser is arranged at the end part of the reduced structure.
Further, the PIV tracer 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 an arc surface formed by the arc line; the particle throwing outlets are multiple and distributed along the length direction of the PIV tracer particle throwing device.
Further, the front air inlet section is of a bell mouth structure; the air inlet middle section is of a round-square structure which is in transition from round to square, and the round-square structure is of a flaring structure with a small front part and a large rear part; the air inlet tail section is a square straight section.
Further, the profile formula of the longitudinal section of the intake front section is as follows: r2＝a2cos2 alpha, (0.6D < a < 0.8D), D is the diameter of the bell mouth outlet, R is the curvature radius of a certain point, D is the included angle between the connecting line of the molded line at a certain point and the bell mouth starting point (inlet) on the same longitudinal section and the central axis; the molded line of the longitudinal section of the air inlet middle section is a linear line obtained by weighted averaging of front-to-back streamline tracing and rear-to-front streamline tracing.
Furthermore, the cross-sectional curves of the leeward side are two secondary curves gradually reduced backwards from two ends of the arc line, the end parts of curved surfaces formed by the two secondary curves are intersected on a plane, and the particle throwing outlets are distributed on the plane; the ratio of the diameter of the particle throwing outlet to the width of the plane is 0.3-0.6, and the opening 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.
Furthermore, the round-square structure is formed by connecting four straight guide lines 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 projection length of the air inlet middle section along the airflow direction to the inlet circle diameter is not less than 1.2.
Further, PIV tracer particle dispenser includes strip body and along its length direction's the passageway of puting in, the particle is puted in the export and is communicated in the passageway of puting in, the entry of puting in of passageway is located the tip of PIV tracer particle dispenser.
Further, the air inlet tail section is provided with a mounting hole for penetrating and mounting the PIV tracer particle dispenser; the difference between the pressure of the PIV tracer particle mixed gas introduced from the particle feeding inlet of the PIV tracer particle feeder and the local atmospheric pressure is not more than 1 kPa.
The invention has the beneficial effects that: the suction-type transonic plane cascade test bed air inlet device adopts a three-section structure, is relatively simple to assemble and process, optimizes the molded line structure of the PIV tracer particle dispenser, realizes the rapid and uniform mixing of PIV tracer particles, and ensures the requirement of a suction-type transonic plane cascade wind tunnel on uniform incoming flow; the PIV tracer particle feeding device is added into the suction type transonic velocity plane blade grid test air inlet device on the premise of not changing the uniformity of an 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 following figures and examples:
FIG. 1 is a schematic three-dimensional structure diagram of an air inlet device of a suction transonic velocity plane cascade test bed.
Fig. 2 is a schematic three-dimensional structure diagram of an air inlet bell mouth.
FIG. 3 is a schematic three-dimensional structure of the intake middle section.
Fig. 4 is a schematic diagram of a three-dimensional structure of a PIV trace particle dispenser.
Detailed Description
As shown in the figure, the suction-type transonic velocity 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 tracer particle dispenser 103, a transverse section of the PIV tracer particle dispenser 103 is provided with a windward surface 4 facing the incoming air and a leeward surface facing away from the incoming air, a cross section curve of the windward surface is an arc line, a cross section curve of the leeward surface is a structure gradually reduced backwards from two ends of the arc line, and a particle dispensing outlet 1 of the PIV tracer particle dispenser is arranged at the end of the reduced structure; in the embodiment, the resistance is reduced and the fluid is guided to pass smoothly through the windward side of the cambered surface, and as shown in the figure, the leeward side adopts a gentle reducing structure and is suitable for the flow of the wind flow, so that the larger turbulent flow is avoided;
the flow field of the planar cascade test device is established by directly introducing air into the atmosphere, connecting an outlet with a low-pressure air source and establishing the flow field by pumping the low-pressure air source, which is not described herein again.
In this embodiment, the PIV trace particle dispenser 103 is strip-shaped and passes through the air intake tail section 104 along the transverse direction of the air intake tail section, and the windward side is an arc surface formed by the arc line; the particle throwing outlets 1 are multiple and distributed along the length direction of the PIV trace particle throwing device 103.
In this embodiment, the air inlet front section 101 is of a bell mouth structure, the inner wall surface of the air inlet bell mouth is a pneumatic channel formed by a curve with smooth and continuous curvature, the air flow pressure is slowly reduced and slowly increased in the pneumatic channel, a uniform velocity field is formed at the outlet, the radius of the bell mouth is selected according to the maximum air inlet flow, and the average velocity of the bell mouth outlet is not more than 6m/s at most in an actual test;
the air inlet middle section 102 is a round-square structure which is in a transition from round to square, and the round-square structure is a flaring structure with a small front part and a large rear part; the air inlet tail section is a square straight section.
In this embodiment, the profile formula of the longitudinal cross section of the intake front segment 101 is as follows: r2＝a2cos2 alpha, (0.6D < a < 0.8D), D is the diameter of the bell mouth outlet, R is the curvature radius of a certain point, and alpha is the included angle between the connecting line of the molded line at a certain point and the bell mouth starting point (inlet) on the same longitudinal section and the central axis; in this embodiment, a is preferably 0.7D, and the profile of the longitudinal cross section of the intake middle section 102 is a weighted average of the front-to-back streamline tracing and the rear-to-front streamline tracing.
In this embodiment, the cross-sectional curves of the leeward side are two quadratic curves gradually reduced from two ends of the arc line backward, the end portions of curved surfaces formed by the two quadratic curves intersect with a plane, and the plurality of particle throwing outlets 1 are distributed on the plane; the ratio of the diameter of the particle throwing outlet 1 to the width of the plane is 0.3-0.6, and the opening density is 10% -20%; in the test, under the condition that the aperture is 1.5mm and the ratio of the aperture to the plane width is 0.375, the optimal imaging effect can be obtained when the open pore density of the tracer particle feeding hole is 15%; the opening density of the tracer particle throwing outlet is the ratio of the diameter of the hole to the distance between the centers of two adjacent holes.
As shown in fig. 4, the overall structure of the PIV trace particle dispenser 103 is a circular hollow (dispensing channel 5) structure, the windward surface 4 in the gas flow field channel is an arc surface (the cross section is an arc line), the leeward surface of the PIV trace particle dispenser is a quadratic curve surface which is bilaterally symmetrical along the gas flow direction, and the quadratic curve surface is tangent to the circle; the leeward side of the secondary curve profile is intersected on a plane, PIV tracer particle throwing outlets 1 are uniformly distributed on the plane, the diameter is generally selected to be 0.8mm-2mm, and the ratio of the throwing outlets, the aperture and the plane width is selected to be a smaller value as far as possible according to the processing process cost, so that the streaming loss is further reduced.
In the embodiment, the ratio of the diameter of the cambered surface of the windward side to the length of the air inlet tail section is not more than 0.1, the preferred scheme in the embodiment is that the windward side is circular, the ratio of the diameter of the circular section to the length of the supporting surface of the supporting wall plate of the straight section is not more than 0.1, the flow field channel is blocked due to the overlarge diameter, a local high-speed area is formed, and the air flow bypassing tail area is increased, so that the straight section is overlong, and the air inlet loss is increased.
In this embodiment, the circular-square structure (the air intake middle section 102) is formed by connecting four straight guide lines uniformly distributed on the circular shape of the inlet of the air intake middle section 102 with four vertexes of the square shape of the outlet, and forming continuous smooth curved surfaces between the adjacent straight guide lines; as shown in fig. 3, four straight guide lines are uniformly distributed on the inlet circle of the round-to-square structure of the preferred embodiment and connected with four vertexes of the outlet square, a smooth continuous curved surface is formed by four closed curves, the curved surface is formed by carrying out weighted average on inlet-to-outlet streamline tracing and outlet-to-inlet streamline tracing, and the round-to-square structure is connected with a small bell mouth of the air inlet front section by 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 projection length of the air inlet middle section 102 along the airflow direction to the inlet circle diameter should be not less than 1.2; the area ratio of the inlet and the outlet of the circular-square-turn structure of the air inlet middle section is not less than 0.6, so that the whole air flow channel of the circular-square-turn section is ensured to be of an expansion type, the air flow can be further decelerated in the section, meanwhile, because the section is a low-speed flow field, a backpressure gradient can be formed in the expansion type channel, the air flow is possibly seriously separated, and the quality of the air flow is influenced, and therefore, the ratio of the projection length to the inlet circular diameter along the air flow direction is not less than 1.2; the ratio of length to inlet diameter is made as large as possible, where laboratory space conditions and costs permit. .
In this embodiment, the PIV tracer particle dispenser 103 includes a strip-shaped body and a dropping channel 5 along the length direction thereof, the particle dropping outlet 1 is communicated with the dropping channel 5, and the dropping inlet 3 of the dropping channel 5 is located at the 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 trace particle dispenser; the difference between the pressure of mixed gas of PIV tracer particles introduced from a particle feeding inlet of the PIV tracer particle feeder and the local atmospheric pressure is not more than 1 kPa; the air inlet tail section is a rectangular air flow channel formed by straight upper and lower wall plates and left and right wall plate assemblies, and the surface roughness of the inner wall of each wall plate assembly is not higher than Ra1.6. Cam-shaped round holes are formed at reasonable positions of an upper wall plate and a lower wall plate in the drawing, and a PIV tracer 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 figure) of the air inlet tail section 104 are provided with cam-shaped circular holes (corresponding to the cross section of the PIV tracer particle dispenser), the PIV tracer particle dispenser is installed and fixed, and the tracer particle dispensing section is selected according to the PIV test laser shooting section, which is the middle section of the cascade in the preferred embodiment;
the PIV trace particle dispenser 103 is directly connected 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 passage and flow out from the upper end. The difference between the introduced tracer particle mixed gas pressure and the local atmospheric pressure is less than 1kPa to ensure that the tracer particle mixed gas cannot form jet flow interference in the main flow channel. The length of the straight section is not less than 1 time of the width of the PIV tracer particle dispenser in the fluid flow direction, so that the tracer particle mixed gas and the main flow are uniformly mixed.
The natural air inlet bell mouth comprises important parameters such as inlet circular radius, bell mouth molded lines, circular-to-square transition section length, inlet-outlet area ratio, particle throwing hole pattern of the PIV tracer particle throwing device, cross section linear design, straight section length, wind tunnel shrinkage ratio and the like, and ensures that the linear structure of each section is reasonably designed and matched with the throwing device with a reasonable structure under the conditions of simpler structure and lower cost, thereby reducing interference and ensuring the accuracy of a detection result.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, 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 or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (10)
1. The utility model provides a suction formula transonic velocity plane cascade test bench air inlet unit which characterized in that: including the anterior segment that admits air, the middle section of admitting air and the tail section of admitting air, the tail section of admitting air is equipped with PIV tracer particle dispenser, have the windward side that comes to and deviate from the leeward side that the air inlet comes to on the transverse section of PIV tracer particle dispenser, the cross section curve of windward side is the pitch arc, the cross section curve of leeward side be by the structure that the both ends of pitch arc dwindled backward gradually, the tip of reducing the structure is equipped with the particle of PIV tracer particle dispenser and puts in the export.
2. The suction transonic velocity planar cascade test stand air induction device of claim 1, wherein: the PIV tracer 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 an arc surface formed by the arc lines; the particle throwing outlets are multiple and distributed along the length direction of the PIV tracer particle throwing device.
3. The suction transonic velocity planar cascade test stand air induction device of claim 1, wherein: the front air inlet section is of a bell mouth structure; the air inlet middle section is of a round-square structure which is in transition from round to square, and the round-square structure is of a flaring structure with a small front part and a large rear part; the air inlet tail section is a square straight section.
4. The suction transonic velocity planar cascade test stand air induction device of claim 3, wherein: the profile formula of the longitudinal section of the air inlet front section is as follows: r2＝a2cos2 alpha, (0.6D < a < 0.8D), D is the diameter of the bell mouth outlet, R is the curvature radius of a certain point, and alpha is the included angle between the central axis and the connecting line between the starting point of the bell mouth on the same longitudinal section and the molded line at the certain point; the molded line of the longitudinal section of the air inlet middle section is a linear line obtained by weighted averaging of front-to-back streamline tracing and rear-to-front streamline tracing.
5. The suction transonic velocity planar cascade test stand air inlet device of claim 2, wherein: the cross section curves of the leeward side are two secondary curves gradually reduced backwards from two ends of the arc line, the end parts of curved surfaces formed by the two secondary curves are intersected on a plane, and a plurality of particle throwing outlets are distributed on the plane; the ratio of the diameter of the particle throwing outlet to the width of the plane is 0.3-0.6, and the opening density is 10% -20%.
6. The suction transonic velocity planar cascade test stand air induction device of claim 5, 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.
7. The suction transonic velocity planar cascade test stand air induction device of claim 4, wherein: the circular-square-turning 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.
8. The suction transonic velocity planar cascade test stand air induction device of claim 7, 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 airflow direction to the inlet circle diameter is not less than 1.2.
9. The suction transonic velocity planar cascade test stand air induction device of claim 5, wherein: the PIV tracer particle dispenser comprises a strip-shaped body and a feeding channel along the length direction of the strip-shaped body, a particle feeding outlet is communicated with the feeding channel, and a feeding inlet of the feeding channel is located at the end of the PIV tracer particle dispenser.
10. The suction transonic velocity planar cascade test stand air induction device of claim 9, wherein: the air inlet tail section is provided with a mounting hole for penetrating and mounting the PIV tracer particle dispenser; the difference between the pressure of the PIV tracer particle mixed gas introduced from the particle feeding inlet of the PIV tracer particle feeder and the local atmospheric pressure is not more than 1 kPa.
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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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| CN114295316B CN114295316B (en) | 2023-12-12 |
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