CN110082062B - Blunt body split structure model for automobile wind tunnel experimental research - Google Patents
Blunt body split structure model for automobile wind tunnel experimental research Download PDFInfo
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- CN110082062B CN110082062B CN201910304486.0A CN201910304486A CN110082062B CN 110082062 B CN110082062 B CN 110082062B CN 201910304486 A CN201910304486 A CN 201910304486A CN 110082062 B CN110082062 B CN 110082062B
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- 238000009434 installation Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 13
- 238000005259 measurement Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 5
- 239000007787 solid Substances 0.000 description 4
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
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- 230000004048 modification Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
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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
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/08—Aerodynamic models
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- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention provides a blunt body split structure model for automobile wind tunnel experimental research, which comprises a main body, an upper tail plate, a lower tail plate and a bottom plate; the main body is a cavity, and the cavity space is used for accommodating the pressure scanning valve; the bottom surface of the main body and the upper end of the tail part are both provided with openings; the bottom plate is connected with the opening edge of the bottom surface of the main body, and the upper tail plate is connected with the opening edge of the upper end of the tail part of the main body; the lower end of the tail part of the main body is provided with a step surface, and the lower tail plate is connected with the edge of the step surface; the outer surfaces of the parts are flush after being jointed, and the joint between the plates is seamless; the main body, the upper tail plate, the lower tail plate and the bottom plate are provided with a plurality of pressure measuring holes; the model greatly reduces the weight of the model, and is convenient to carry and adjust; meanwhile, the built-in installation of the measuring instrument is convenient, the disturbance caused by the external measuring instrument can be avoided, the experimental data can be disturbed, and the upper tail plate and the lower tail plate can be replaced for comparison research.
Description
Technical Field
The invention relates to the technical field of automobile aerodynamics, in particular to a blunt body split structure model for automobile wind tunnel experimental research.
Background
Automotive aerodynamics is an important branch of aerodynamics, and with the development of the automotive industry in China, the role of automotive aerodynamics is increasingly prominent.
The data such as aerodynamic force, surface pressure, flow field information and the like are acquired through wind tunnel experiments, and are basic data of the current automobile aerodynamic research, and the posture of the model needs to be adjusted for many times due to the fact that the working conditions of the data acquired through the experiments are many.
The bluff body model is a similar body model used for internationally conducting automobile aerodynamic studies, and is generally a solid model of a single body when the model is processed. Obviously, in wind tunnel test, because the model is solid as a whole, a pressure valve for measuring surface pressure can only be arranged outside the vehicle body model through a lead wire, thereby causing object turbulence and disturbing measurement data; the integral solid model is moved and adjusted for many times, which is time-consuming and labor-consuming; the problem of up-down movement of the model after wind is blown is solved after the model is connected with a balance measurement system in the installation process. The presence of these problems increases the test error, labor intensity and time consumption.
Disclosure of Invention
Aiming at the defects and the defects of the prior art, the invention provides the blunt body split structure model for the automobile wind tunnel experimental study, which changes the existing integral solid processing and manufacturing method, not only is convenient for the installation of a testing instrument, saves time and labor, but also can increase the structural change study requirement of the model under various working conditions, and further can eliminate the data errors generated by the up-and-down movement of the model after wind.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
A blunt body split structure model for automobile wind tunnel experimental study comprises a main body, an upper tail plate, a lower tail plate and a bottom plate; the main body is a cavity, and the cavity space is used for accommodating the pressure scanning valve; the bottom surface of the main body and the upper end of the tail part are both provided with openings; the bottom plate is connected with the opening edge of the bottom surface of the main body, and the upper tail plate is connected with the opening edge of the upper end of the tail part of the main body; the lower end of the tail part of the main body is provided with a step surface, and the lower tail plate is connected with the edge of the step surface; the outer surfaces of the parts are flush after being jointed, and the joint between the plates is seamless; and the main body, the upper tail plate, the lower tail plate and the bottom plate are all provided with a plurality of pressure measuring holes.
Further, the upper tail plate, the lower tail plate and the bottom plate are connected with the main body in a screw mode.
Further, the connecting piece of screw connection is countersunk head screw or countersunk head bolt.
Further, the pressure taps are arranged on one side of each part of the model.
Further, a nozzle collar is inserted into the pressure measuring hole.
Further, the model also comprises a support column fixed on the bottom plate; the support columns are four and symmetrically fixed at four corner ends of the bottom plate.
Further, the support column is a hollow tube, and a threaded hole is further formed in the radial direction of the support column.
Further, a plurality of strip-shaped through grooves are formed in the step surface at the lower end of the tail part of the main body.
Further, the strip-shaped through groove can fix various additional spoilers.
Further, the model comprises a plurality of groups of upper tail plates and lower tail plates which are different in inclination angle and can be replaced with each other.
The beneficial effects of the invention are as follows:
1. The blunt body split structure model for the automobile wind tunnel experimental study provided by the invention has the advantages that the main body is a cavity body, the weight of the model is greatly reduced, and the model is convenient to carry and adjust; meanwhile, the built-in installation of the measuring instrument is convenient, and the disturbance of experimental data caused by the disturbance of the external measuring instrument can be avoided.
2. The blunt body split structure model provided by the invention is formed by splicing all the components, is easy to process and replace after being damaged, has flat splicing surfaces, meets the smoothness requirement of a vehicle body, and reduces test errors.
3. The upper tail plate and the lower tail plate of the blunt body split structure model for the automobile wind tunnel experimental study are convenient to assemble and disassemble, can be replaced by the upper tail plate and the lower tail plate with different back inclined angles, can simulate different back and tail shapes for comparison study, can be matched with a plurality of upper tail plates and lower tail plates only by one main body, and saves cost.
4. The blunt body split structure model for the automobile wind tunnel experimental study provided by the invention has the advantages that the surfaces of all the components are flat, and the components are provided with a plurality of pressure measuring holes, so that the accurate measurement of the pressure on the upper surface and the lower surface of the automobile is conveniently realized.
5. The blunt body split structure model for automobile wind tunnel experiment research provided by the invention has the advantages that various additional spoilers can be arranged at the tail end of the main body of the blunt body split structure model for researching the surface pressure of the model under different flow fields.
6. The support column is arranged on the bottom plate of the blunt body split structure model for automobile wind tunnel experimental study, can be matched with the support column of the balance measurement system, firmly fixes the model on the balance, and can ensure that the model keeps a stable state and accurately measures aerodynamic force when wind tunnel test is carried out.
Drawings
FIG. 1 is a schematic diagram of a blunt body split structure model for automobile wind tunnel experimental study;
FIG. 2 is a schematic diagram of a blunt body split structure model for automobile wind tunnel experimental study;
FIG. 3 is a schematic diagram of the main structure of the blunt body split structure model;
FIG. 4 is a schematic diagram of the main structure of the blunt body split structure model;
FIG. 5 is an effect diagram of different upper and lower tail plates mounted to the tail of the main body;
Fig. 6 is a schematic diagram of a support column structure.
Detailed Description
The invention is further described below with reference to the drawings and examples. Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to be limiting of the present patent; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Example 1
A blunt body split structure model for automobile wind tunnel experimental study, as shown in figures 1 and 2, comprises a main body 1, an upper tail plate 2, a lower tail plate 3, a bottom plate 4 and a support column 5; as shown in fig. 3, the main body 1 is a tetragonal cavity, and the cavity space is used for accommodating a pressure scanning valve; the bottom surface of the main body 1 and the upper end of the tail part are provided with openings; the bottom plate 4 is connected with the opening edge of the bottom surface of the main body 1, and the upper tail plate 2 is connected with the opening edge of the upper end of the tail of the main body 1; the lower end of the tail part of the main body 1 is provided with a step surface, and the lower tail plate 3 is connected with the edge of the step surface; each of the junctions forms a flat outer surface.
In this embodiment, the upper tail plate, the lower tail plate, the bottom plate and the main body are all connected by adopting a screw fixing manner, as shown in fig. 3 and 4,5 threaded holes capable of being fixed with the upper tail plate are formed in the upper end of the tail of the main body; the lower end of the tail part of the main body is provided with 6 threaded holes which can be fixed with the lower tail plate; the bottom of the main body is provided with 8 threaded holes which can be fixed with the bottom plate; countersunk screws or countersunk bolts are adopted between the connecting pieces used at the fixing positions, so that the surface of the model can be kept flat as much as possible, turbulence can not be generated due to the fact that the connecting pieces are protruded, and experimental accuracy is not affected.
The specific working mode of the invention provided by the embodiment is as follows: the assembled blunt body split structure model is arranged on a balance measurement system special for wind tunnel experiments, the balance measurement system is provided with a strain balance, the strain balance is widely applied in automobile wind tunnels due to the advantages of light weight, small volume, strong applicability, low cost and the like, and an elastic element of the strain balance is stuck with a strain gauge.
And then, the fixed model receives tests of various simulation working conditions in a wind tunnel test chamber and performs data acquisition. The upper tail plate 2 and the lower tail plate 3 of the model are provided with an inclined outer surface after being arranged at the tail part of the main body, the inclined outer surfaces simulate the tail shape of a common passenger car, the joint of the tail part of the whole main body and the upper tail plate and the lower tail plate restores structures such as a rear window board, a rear upper cover plate, a rear baffle plate, a rear fender, a rear skirt plate, a luggage compartment cover and the like, and airflow generated by a wind tunnel can generate a flow field which is very similar to the airflow at the tail part of the car when the car runs in a real working condition when passing through the tail part of the model.
The main body 1, the upper tail plate 2, the lower tail plate 3 and the bottom plate 4 of the model are all provided with a plurality of pressure measuring holes 6, nozzle lantern rings are inserted into the pressure measuring holes 6, the nozzle lantern rings are adhered in the pressure measuring holes 6 through soluble glue, the nozzle lantern ring arranged in each pressure measuring hole 6 is one pressure measuring point, the pressure of the surface of the vehicle under the working condition can be approximately obtained through measuring the pressure measuring points, the pressure measuring holes 6 are arranged on one side of each part of the model, and only one side of data is needed to be measured due to symmetry of the model.
The specific pressure measurement mode is as follows: a pressure measuring module of the electronic pressure scanning valve is arranged in a cavity between the main body 1 and the bottom plate 4, the pressure measuring module comprises a plurality of piezoresistive sensors, and each sensor is respectively connected with a nozzle collar of the pressure measuring hole 6 through a plurality of thin soft pipes; when the pressure measuring module is in a measuring state, a software program on the computer controls the pressure measuring point gating interface to be respectively connected with different sensors of each pressure measuring module according to a specified sampling frequency and sampling duration, sensor signals at the moment are processed by a low-pass filter, are converted and then are stored in a memory of the computer, and after all data of one simulation working condition are measured, the sensor signals are stored in a hard disk of the computer to wait for processing. Thus, the collection of the surface pressure of each of the upper surface and the lower surface of the vehicle in the simulated working condition can be completed.
Based on the pressure measurement mode, the blunt body split structure model is matched with corresponding design on the structure: as shown in fig. 3, the main body 1 is a tetragonal cavity, and is sealed by the bottom plate 4 and the upper tail plate 2, so that the pressure measuring module of the pressure scanning valve can be fixed on the bottom plate surface inside the cavity; secondly, a concave cavity arranged at the upper end of the tail part of the main body is communicated with a concave cavity arranged at the bottom of the main body, so that a thin hose connected with the pressure scanning valve pressure measuring module can be connected with a nozzle collar in the upper tailboard pressure measuring hole 6 in an unobstructed manner; meanwhile, although the lower tail plate 3 is not communicated with the cavity of the main body, a plurality of strip-shaped through grooves 7 are formed in the step surface at the lower end of the tail part of the main body, which is jointed with the lower tail plate, and a thin hose connected with the scanning valve pressure measuring module can pass through the through grooves and then be connected with a nozzle collar in a pressure measuring hole on the lower tail plate 3.
The measuring mode has the advantages that the blunt instrument model main body is of a tetragonal cavity structure based on the blunt instrument model main body, the pressure measuring valve is arranged in the cavity, the plurality of pressure measuring thin soft pipes are densely distributed in the main body, and turbulent flow caused by the arrangement of the pressure measuring instrument at the outer side can be avoided, so that the test result is disturbed.
The lower tail plate 3 of the model can be taken down in the test, then different additional spoilers are arranged in the strip-shaped through groove 7 on the step surface at the lower end of the tail part of the main body, different flow fields are generated at the tail part of the main body, and the functions generated by various spoilers are tested for comparison research; meanwhile, the joint surfaces of the two ends of the upper tail plate 2 and the lower tail plate 3 and the main body are vertical planes or horizontal planes, and the arrangement is used for avoiding joints at the bending positions of the flow field which are sensitive to each other, so that larger test errors are generated.
Example 2
The difference between the present embodiment and embodiment 1 is that the upper or lower tail plate adopted in the present embodiment is different from that in embodiment 1 in terms of the shape and inclination angle, and the vehicle tail shape simulated after being mounted on the tail of the main body is different, as shown in fig. 5, 21, 22, 23 are upper tail plates with different inclination angles, and 31, 32, 33, 34 are lower tail plates with different inclination angles.
The model provided by the invention is provided with a plurality of groups of upper tail plates and lower tail plates which can be replaced and have different inclination angles, namely, the upper tail plates and the lower tail plates can be arranged at the tail part of the main body in the same screw fixing mode, and based on the fixing mode, the tail plates can be easily replaced in actual operation, so that the upper tail plates and the lower tail plates with different inclination angles can be assembled in pairs to simulate various back and tail structures of automobiles, the comparison research is convenient, the material is saved, and only one main body is matched with each different tail plate to be converted into a plurality of models.
Example 3
In this embodiment, a method for installing the model described in embodiment 1 and embodiment 2 is provided.
In the case of tests in wind tunnels, if the model is not firmly installed, it is highly likely that the test results will be inaccurate, even if accidents occur, and therefore, the automobile model must be firmly installed on the balance measurement system. In this embodiment, be equipped with 4 regularly arranged pillars on the balance holding surface that strains, simultaneously be equipped with 4 regularly arranged support columns 5 on the model bottom plate, and support column 5 is hollow post, can be connected with the pillar on the balance with hole axle complex mode, namely the preliminary fixed of model can be accomplished to balance holding surface pillar inserted respectively in the hole of corresponding support column, but for easy to assemble, the diameter of model support column bottom hole can be greater than 2 millimeters balance pillar diameter, otherwise hardly insert 4 pillars of balance simultaneously in the hole of model support column bottom, therefore this has just caused the model to possibly have slight vibration when receiving great aerodynamic force to the gesture of model slightly deviates from initial position when leading to the experiment. In order to avoid the above problems, a rigid connection between the model and the balance is required: as shown in fig. 6, a threaded hole 9 is formed in the radial direction of the support column 5, a precise countersunk head screw is in spiral connection with the threaded hole in the radial direction of the support column, after screwing, the tail end of the countersunk head screw passes through the threaded hole to be tightly pressed with a support column of a radial balance measurement system, so that a locking state is formed, and the model in a wind tunnel test is prevented from moving up and down along the support column after being acted by wind force.
It is apparent that the above examples are only examples for clearly illustrating the technical solution of the present invention, and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (5)
1. A blunt body split structure model for automobile wind tunnel experimental study is characterized by comprising a main body, an upper tail plate, a lower tail plate and a bottom plate; the main body is a cavity, and the cavity space is used for accommodating the electronic pressure scanning valve; the bottom surface of the main body and the upper end of the tail part are both provided with openings; the bottom plate is connected with the opening edge of the bottom surface of the main body, and the upper tail plate is connected with the opening edge of the upper end of the tail part of the main body; the lower end of the tail part of the main body is provided with a step surface, and the lower tail plate is connected with the edge of the step surface; the bottom plate is flush with the opening edge of the bottom surface of the main body, the upper tail plate is flush with the opening edge of the upper end of the tail of the main body, and the outer surface of the lower tail plate is flush with the edge of the step surface after being jointed, and no groove is reserved between the plates; the main body, the upper tail plate, the lower tail plate and the bottom plate are provided with a plurality of pressure measuring holes;
The upper tail plate, the lower tail plate and the bottom plate are connected with the main body in a screw mode, and the inclined angles of the upper tail plate and the lower tail plate are different and can be mutually replaced;
a nozzle collar is inserted into the pressure measuring hole;
the bottom plate is fixed with a support column; the support columns are four and symmetrically fixed at four corner ends of the bottom plate;
A plurality of strip-shaped through grooves are formed in the step surface at the lower end of the tail part of the main body;
During pressure measurement, a pressure measurement module of the electronic pressure scanning valve is arranged in a cavity between the main body and the bottom plate, the pressure measurement module comprises a plurality of piezoresistive sensors, and the piezoresistive sensors are respectively connected with nozzle collars of pressure measurement holes through a plurality of thin soft pipes; when the pressure measuring module is in a measuring state, a software program on the computer controls the pressure measuring point gating interface to be respectively connected with different piezoresistive sensors of the pressure measuring module according to the specified sampling frequency and sampling duration, the piezoresistive sensor signals are processed and transformed by a low-pass filter and then stored into the computer, and after all data of one simulation working condition are measured, the signals are stored into the computer for waiting to be processed.
2. The blunt body disassembly structural model for automobile wind tunnel experimental study according to claim 1, wherein the screw connection connecting piece is a countersunk screw or countersunk bolt.
3. The blunt body disassembly structural model for automobile wind tunnel experimental study according to claim 1, wherein the pressure taps are arranged on one side of each part of the model.
4. The blunt body split structure model for automobile wind tunnel experimental study according to claim 1, wherein the support column is a hollow tube, and a threaded hole is further formed in the radial direction of the support column.
5. The blunt body disassembly structural model for automobile wind tunnel experimental study according to claim 1, wherein the strip-shaped through groove can fix various additional spoilers.
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| CN113049218A (en) * | 2019-12-27 | 2021-06-29 | 上汽通用汽车有限公司 | Pneumatic model mechanism |
| CN111521372A (en) * | 2020-06-19 | 2020-08-11 | 湖南文理学院 | Long blunt body passenger car split structure model for wind tunnel experiment research |
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| CN209764377U (en) * | 2019-04-16 | 2019-12-10 | 湖南工业大学 | Blunt body split structure model for automobile wind tunnel experiment research |
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| KR200332928Y1 (en) * | 2003-06-24 | 2003-11-12 | 이근식 | A wind tunnel testing machine make use of vehicle |
| CN201060093Y (en) * | 2007-06-14 | 2008-05-14 | 同济大学 | 3/4 opening reversed flow type automobile model wind-tunnel test device |
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