CN109946037A - Simulate the sprue mobile device and application of the variation of support interferences amount - Google Patents
Simulate the sprue mobile device and application of the variation of support interferences amount Download PDFInfo
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- CN109946037A CN109946037A CN201910338482.4A CN201910338482A CN109946037A CN 109946037 A CN109946037 A CN 109946037A CN 201910338482 A CN201910338482 A CN 201910338482A CN 109946037 A CN109946037 A CN 109946037A
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- 238000005259 measurement Methods 0.000 claims abstract description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 12
- 229910052802 copper Inorganic materials 0.000 claims description 12
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- 230000000694 effects Effects 0.000 claims description 6
- 238000007664 blowing Methods 0.000 claims description 5
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- 208000015943 Coeliac disease Diseases 0.000 description 80
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- 238000006073 displacement reaction Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
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- 230000000903 blocking effect Effects 0.000 description 1
- 235000014121 butter Nutrition 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
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Abstract
The invention discloses the sprue mobile devices and application of a kind of simulation support interferences amount variation, belong to test aerodynamic scope, purpose is to improve that current two-step method support interferences assessment supplementary means is few, and the drag data correlation of different wind-tunnel facilities and rack form is difficult to the status analyzed.It includes installation unit, linear motion realization unit, guide and limit unit, sprue unit, control system, installation unit includes bracket connection ring, straight joint snap ring, the connecting rod, limit card block for being connected with bracket, and bracket connection ring, straight joint snap ring are in circular ring shape respectively.The application is applied in wind tunnel test, on the basis of accurate, reliable, obtain the corresponding relationship of base pressure and model resistance as early as possible by testing train number on a small quantity, in favor of the analysis of support interferences variable quantity, and the drag data correlation analysis of different wind-tunnel facilities and rack form, application value with higher is conducive to the accuracy for further promoting wind tunnel test measurement result.
Description
Technical field
The present invention relates to test aerodynamic scope, the mobile dress of sprue of specially a kind of simulation support interferences amount variation
It sets and applies.
Background technique
Tail branch dynamometry is one of main mode of high wind tunnel testing, and support system therein is indispensable experimental rig.
Due to the presence of support system, rear body is brought to stream the change of field distortion and base pressure distribution, directly affected to resistance, cruise before model
The Accurate Prediction of efficiency etc..Currently, usually measuring support interferences amount in the way of Auxiliary support, and tested using two-step method,
It is modified after test；But the test method only considers that support interferences to the macroscopic effects of model aerodynamic characteristic, have ignored base pressure
The details such as body flow characteristics influence after variation and model.Further consider to include a whole set of testing equipment including bracket, due to
The data differences factor such as bracket, flow field, Dong Bi, wave reflection is more between distinct device, can not accurate evaluation wherein support interferences pair
The specific magnitude that data accuracy influences, increases the difficulty of different tests equipment room test data correlation analysis, to a certain degree
On limit the bold use of test data.
For this purpose, there is an urgent need to a kind of new devices and/or method, to solve the above problems.
Summary of the invention
Goal of the invention of the invention is: few for current two-step method support interferences assessment supplementary means and different
The drag data correlation of wind-tunnel facilities and rack form is difficult to the status analyzed, provide it is a kind of simulation support interferences amount variation
Device and its application.The application is applied in wind tunnel test, it is most by testing train number on a small quantity on the basis of accurate, reliable
The fast corresponding relationship for obtaining base pressure and model resistance, in favor of the analysis of support interferences variable quantity, and different wind-tunnel facilities and
The drag data correlation analysis of rack form, application value with higher are conducive to further promote wind tunnel test measurement
As a result accuracy.
To achieve the goals above, the present invention adopts the following technical scheme:
The sprue mobile device of support interferences amount variation is simulated, including installation unit, linear motion realize unit, guide and limit list
Member, sprue unit, control system；
The installation unit includes bracket connection ring, straight joint snap ring, the connecting rod, limit card block for being connected with bracket, institute
State bracket connection ring, straight joint snap ring is in circular ring shape respectively, the bracket connection ring is arranged in parallel with straight joint snap ring, the company
Extension bar is at least two, is connected as one between the bracket connection ring and straight joint snap ring by connecting rod and constitutes installation list
Member；
One end of the installation unit is connected by bracket connection ring with the flange of bracket, and the other end is installed by straight joint snap ring
Mounting platform is formed in the conical surface of straight joint, and by connecting rod connecting bracket connection ring and straight joint snap ring；
The linear motion realizes that unit includes bearing, lead screw, driving assembly, feed screw nut, and the bearing is at least two, institute
State that bearing is connected with a connecting rod and connecting rod can provide support for bearing, the lead screw is flexibly connected with bearing and lead screw energy
Relative axle forward it is dynamic, the driving component is connected with lead screw and driving assembly can be forwarded for lead screw relative axle it is dynamic power is provided, institute
It states driving assembly to be connected with control system, the feed screw nut is arranged on lead screw；
The guide and limit unit includes the first guide rail, sliding block, the first sprue connecting rod, the second guide rail, the second sprue connecting rod, described
First guide rail is arranged in the connecting rod being connected with bearing, and the sliding block is connected with the first guide rail, the sliding block and feed screw nut
It is connected and feed screw nut energy band movable slider is mobile relative to the first guide rail, the sliding block passes through the first sprue connecting rod and sprue unit phase
Even and sliding block can provide power for sprue unit motion, and second guide rail is connected with a connecting rod, and second sprue connects
The both ends of bar are connected respectively with the second guide rail, sprue unit and the second guide rail, the second sprue connecting rod can play sprue unit and lead
To effect；
The sprue unit includes sprue, sliding sleeve, the first sprue connecting rod, the second sprue connecting rod respectively with sprue phase
Even, the sliding sleeve is arranged on sprue.
The installation unit further includes limit card block, and the connecting rod, limit card block are respectively two, the bracket connection
It is provided with the card slot matched with connecting rod on ring and connecting rod can be stuck in the card slot of bracket connection ring, the limit card block point
It is not connected with connecting rod, bracket connection ring and connecting rod and bracket connection ring can be connected together by limit card block.
The bracket connection ring is connected by screw with the flange of bracket.
The driving component includes stepper motor, and the stepper motor is connected with lead screw, and the stepper motor and control are
System is connected.
The driving component further includes shaft coupling, and the stepper motor is connected by shaft coupling with lead screw.
First guide rail is square rail.
Second guide rail is drawer guideway.
The sprue unit further includes copper sheathing, and the copper is set in sliding sleeve.
The application of aforementioned device is used in the support interferences variable quantity assessment of wind tunnel test.
Include the following steps:
(1) sprue mobile device is installed；
(2) during blowing, control system issues signal to driving assembly, and driving assembly drives sprue to be moved to setting position
It sets；According to sets requirement, driving assembly drives sprue repeatedly to be moved, until the movement of sprue position meets sets requirement；
(3) in the sprue moving process of step 2, by the full machine resistance of balance measurement model, and the bottom intracavitary by model tail
Pressure pipe measurement model base pressure；Based on the movement of sprue in step 2, corresponding model base pressure and the full machine resistance of model are obtained, and is intended
Close out the functional relation of model base pressure Yu the full machine resistance of model.
In the step 2, sprue is mobile towards bracket from the distant to the near, and movement stops setting time afterwards in place, then carries out down
It is primary mobile.
Consideration is analyzed by base pressure and model resistance, and base pressure variation is the reaction of support interferences state；Simultaneously as
Support system blocks body surface pressure distribution after forward pass effects model, and shape resistance after model is caused to change.Therefore, mould
Association after type between shape resistance and base pressure can react support interferences amount.Ignore blocking forward pass effect to hinder forebody shape
Power, model surface frictional resistance influence when, shape resistance after full machine resistance can represent.Therefore, develop a kind of simulation support interferences
The sprue mobile device for measuring variation, the model resistance measurement for carrying out change base pressure facilitate analysis support interferences and stream feature to bottom
Influence and instruct different wind-tunnel facilities related to the drag data of rack form auxiliary two-step method support interferences assessment
Property analysis, have great importance.
In view of strut have it is longer determine diameter segment, therefore, the application using sprue along strut sliding, stepper motor and
The form of lead screw driving and guide rail guiding transmission, to simulate the variation of support interferences amount.The main thought of the application measurement method exists
In: the devices such as stepper motor, lead screw, guide rail are installed on straight joint, the real-time control of sprue position is realized using stepper motor
System reduces the influence of overall mechanism stream field by the sprue mobile device of the application, complete based on lead screw, guide rail and sprue copper sheathing
At the conversion that motor rotary motion to sprue moves along a straight line, realizes and become base pressure drag measurement.
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are:
(1) the sprue mobile device of the application includes installation unit, linear motion realization unit, guide and limit unit and sprue list
Member, control system, overall structure is simplified, at low cost；Using the mounting means around straight joint and strut, sprue shifting can be reduced
Dynamic influence of the device to test section primary air, guarantees the accuracy of tail bottom of chamber pressure and resistance measurement；Using stepper motor, Neng Goushi
The accurate control of existing sprue axial displacement, can be obtained the corresponding relationship of base pressure and model resistance by wind-tunnel one-shot, mentions
High testing efficiency and accuracy；
(2) the application guarantees the verticality of axial movement by copper sheathing and guide rod, will not generate since mechanism is loaded caused other
Card, it is practical and highly-safe；
(3) linear motion of the application realizes that unit guarantees driving transmission by shaft coupling, effectively reduces motor shaft and lead screw peace
Coaxiality deviation caused by deviation is filled, it is easy to control and can satisfy different experimental conditions；
(4) square rail in the guide and limit unit of the application and drawer guideway are respectively arranged in the upper and lower strut of installation unit
On, the guide rail of different trips can be selected according to equipment actual demand, it is versatile；
(5) the application is skillfully constructed, and rationally, structure is simple, easy to use, application value with higher for design.
Detailed description of the invention
Examples of the present invention will be described by way of reference to the accompanying drawings, in which:
Fig. 1 is the overall structure diagram of sprue mobile device in embodiment 1.
Fig. 2 is the overall structure diagram of another angle of sprue mobile device in Fig. 1.
Fig. 3 is stepper motor and lead screw connection schematic diagram in embodiment 1.
Fig. 4 is feed screw nut and square rail connection schematic diagram in embodiment 1.
Fig. 5 is the base pressure and the full machine resistance of model that the sprue mobile device in embodiment 1 obtains after a blowing test
Relational graph.
Fig. 6 is the assembling schematic diagram of sprue mobile device and bracket leading portion, straight joint and strut.
Marked in the figure: 1, stepper motor, 2, limit card block, 3, square rail, 4, sliding block, 5, feed screw nut, 6, second is stifled
Block connecting rod, 7, lead screw, 8, sprue, 9, sliding sleeve, 10, copper sheathing, the 11, first sprue connecting rod, 12, straight joint snap ring, 13, drawer
Guide rail, 14, connecting rod, 15, bracket connection ring, 16, motor cabinet, 17, shaft coupling, 18, bearing block, 19, feed screw nut seat, 20,
Bracket leading portion, 21, straight joint, 22, strut.
Specific embodiment
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
Any feature disclosed in this specification unless specifically stated can be equivalent or with similar purpose by other
Alternative features are replaced.That is, unless specifically stated, each feature is an example in a series of equivalent or similar characteristics
?.
Embodiment 1
As shown, the present embodiment provides a kind of sprues of simulation support interferences amount variation applied to 2.4 meters of transonic wind tunnels
Mobile device, axial movement stroke are 770mm, more than half length of covering strut equal diameter section is (as shown in fig. 6, this reality
The sprue mobile device and bracket leading portion, straight joint and strut for applying example are assembled, bracket leading portion, straight joint, strut successively phase
It is linked together).The sprue mobile device uses modularized design, is divided into installation unit, linear motion realizes unit, guide and limit
Four major parts of unit and sprue unit further include the control system matched with linear motion realization unit.
In the present embodiment, installation unit includes for the bracket connection ring connected with bracket leading portion, straight joint snap ring, connect
Bar, limit card block, connecting rod, limit card block distinguish two, and bracket connection ring, straight joint snap ring are in circular ring shape respectively, and bracket connects
It connects ring to be arranged in parallel with straight joint snap ring, connecting rod uses two, passes through connecting rod between bracket connection ring and straight joint snap ring
It is connected as one and constitutes installation unit.In the structure, it is provided with the card slot matched with connecting rod in bracket connection ring, connects
Bar is connected in the card slot of bracket connection ring, and connecting rod and bracket connection ring are connected together by limit card block, and even
Extension bar is separately positioned on the outside of straight joint snap ring.
In the device, bracket connection ring is held out against by screw on the flange of bracket leading portion, and straight joint snap ring passes through inside
The conical surface is clamped in the conical surface of straight joint；Connecting rod one end is clamped in the corresponding groove of bracket connection ring, and the other end is held out against by screw
Straight joint snap ring, and the nearly bracket end of connecting rod is further compressed by described two limit card blocks, form a mounting platform.It should
In structure, one end of installation unit is connected by bracket connection ring with the flange of bracket, and the other end is installed by straight joint snap ring
Mounting platform is formed in the conical surface of straight joint, and by connecting rod connecting bracket connection ring and straight joint snap ring.
In the present embodiment, linear motion realize unit include bearing, lead screw, driving assembly, for being provided for driving assembly
Motor cabinet, the feed screw nut of support.In the present embodiment, driving assembly includes stepper motor, shaft coupling, and stepper motor passes through shaft coupling
Device is connected with lead screw, and stepper motor is connected with control system, and stepper motor is connected by motor cabinet with installation unit.Wherein, axis
Holding is two, and bearing is connected with a connecting rod.The both ends of lead screw are flexibly connected with bearing respectively, and feed screw nut is arranged in the silk
On thick stick, and nut is located between two bearings.In other words, it is single to realize that the both ends of lead screw in unit are mounted on installation for linear motion
In member, there is bearing at both ends, and lead screw installs motor cabinet and stepper motor through centre, origin or beginning.In the present embodiment, lead screw both ends peace
Bearing is filled, and is equipped with bearing block, nearly bracket end bearing block holds out against limit card block by screw, and remote branch of a clan frame end bearing block passes through independence
Fixing seat be mounted in connecting rod.Type of attachment between stepper motor and lead screw is shown in Fig. 3, and connection type is followed successively by motor
The conversion that motor rotary motion moves along a straight line to feed screw nut may be implemented in seat, shaft coupling, bearing block, limit card block.The structure
In, it is connected between the motor shaft and lead screw of stepper motor by shaft coupling, movement caused by mechanism difference axis is avoided not block.
In the present embodiment, guide and limit unit is by the first guide rail, sliding block, the first sprue connecting rod, the second guide rail, the second sprue
Connecting rod is constituted.Wherein, the first guide rail is arranged in the connecting rod being connected with bearing, and sliding block is connected with the first guide rail, sliding block and silk
Thick stick nut is connected, and sliding block is connected by the first sprue connecting rod with sprue unit, and the second guide rail is connected with another connecting rod, and second
The both ends of sprue connecting rod are connected with the second guide rail, sprue unit respectively.
In the present embodiment, the first guide rail uses square rail, and the second guide rail uses drawer guideway.The installation of guide and limit unit
In two plane up and down of straight joint, upper plane is square rail, and the origin or beginning of square rail is connected with feed screw nut, square rail
End is connected by sliding block, sprue connecting rod with sprue；Lower plane is drawer guideway, and end passes through the second sprue connecting rod and sprue
It is connected.More specifically, square rail and drawer guideway, which pass through screw, holds out against installation unit, a connecting rod and square rail are logical
It crosses screw to hold out against, another connecting rod and drawer guideway are held out against by screw.The type of attachment of sliding block and feed screw nut is shown in Fig. 4,
Connection type is to be connected by the first sprue connecting rod with feed screw nut seat.
In the present embodiment, sprue unit includes sprue, sliding sleeve, copper sheathing, the first sprue connecting rod, the second sprue connecting rod point
It is not connected with sprue, sliding sleeve is arranged on sprue, and copper is set in sliding sleeve.Wherein, the end of sprue unit with
The sliding sleeve covered on strut is connected；It is embedded in copper sheathing between the sliding sleeve and strut of sprue unit, realizes sprue unit along branch
The smooth sliding of bar axial direction.More specifically, sliding sleeve covers outside strut equal diameter section, copper sheathing is installed inside sliding sleeve, uses
It in the verticality for guaranteeing that mechanism is moved axially along strut, needs to be lubricated with butter before use, after mechanism is loaded during avoiding shifting from surveying
The not card generated.Sprue holds out against sliding sleeve by screw, and the first sprue connecting rod, the second sprue connecting rod and sprue are also by screw
It holds out against.
In order to reach superior technique effect, installation unit includes limiting device (the limit card block structure i.e. in the present embodiment
At limiting device), limiting device compresses connecting rod by the limit card block being mounted in bracket connection ring, realizes installation unit
It is accurately positioned.
The workflow of the sprue mobile device of the application is as follows:
(1) sprue unit is installed on ground, including sprue, sliding sleeve, copper sheathing；
(2) bracket connection ring is installed on flange bracket, is held out against by screw, and straight joint snap ring is installed on direct nose cone
Then face installs connecting rod and limit card block；
(3) stepper motor, lead screw, feed screw nut are installed；
(4) square rail and drawer guideway are installed on connecting rod, are held out against by screw, and further by sliding block and the first sprue
Connecting rod installs；
(5) the mounted sprue unit of (1) step is held out against into the first sprue connecting rod, the second sprue connecting rod by screw.
Fig. 6 gives the assembling schematic diagram of sprue mobile device and bracket leading portion, straight joint and strut.
After being installed by above-mentioned steps, the model resistance measurement test for becoming base pressure can be carried out, test process is as follows.
Stepper motor is controlled by external electric impulse signal, and driving force is provided；During primary blowing, sprue by remote and
Proximad the total 770mm of support motion, be divided into 8 ladders by equal displacements, each stepwise movement is delayed 3s afterwards in place, then starts downwards
One stepwise movement.During blowing, surveyed by the full machine resistance of balance measurement model, while by the intracavitary base pressure pipe of model tail
Amount model base pressure (base pressure pipe totally 4, the distance for going deep into tail chamber is greater than the radius of the intracavitary strut of tail, one is arranged on strut top,
Other are around circumferential successively 90 ° of the interval of strut, using the arithmetic mean of instantaneous value of four foundation pressure pipe pressure as end value).
In the present embodiment, the model base pressure (ratio of base pressure and far field static pressure) and the full machine of model of corresponding 8 ladders are obtained
8 class values of resistance (nondimensionalization), and the linear relationship of base pressure Yu the full machine resistance of model can be further fitted, as shown in Figure 5.
Test result shows using the application, by testing train number on a small quantity, can quickly, accurately obtain base pressure and model
The corresponding relationship of resistance is conducive to the analysis of support interferences variable quantity, and the resistance number of different wind-tunnel facilities and rack form
According to correlation analysis.Meanwhile it being based on the test method, data obtained are smaller by systematic error, and test result is accurate, can
It leans on.
The foregoing is merely a kind of embodiments of the invention, are not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.It is all within principle of the invention, it is made it is any modification, etc.
With replacement, improvement etc., should all be included in the protection scope of the present invention.I.e. the present invention expands to any drapes over one's shoulders in the present specification
The new feature of dew or any new combination, and disclose any new method or process the step of or any new combination.
Claims (10)
1. simulating the sprue mobile device of support interferences amount variation, which is characterized in that realized including installation unit, linear motion single
Member, guide and limit unit, sprue unit, control system；
The installation unit includes bracket connection ring, straight joint snap ring, the connecting rod, limit card block for being connected with bracket, institute
State bracket connection ring, straight joint snap ring is in circular ring shape respectively, the bracket connection ring is arranged in parallel with straight joint snap ring, the company
Extension bar is at least two, is connected as one between the bracket connection ring and straight joint snap ring by connecting rod and constitutes installation list
Member；
One end of the installation unit is connected by bracket connection ring with the flange of bracket, and the other end is installed by straight joint snap ring
Mounting platform is formed in the conical surface of straight joint, and by connecting rod connecting bracket connection ring and straight joint snap ring；
The linear motion realizes that unit includes bearing, lead screw, driving assembly, feed screw nut, and the bearing is at least two, institute
State that bearing is connected with a connecting rod and connecting rod can provide support for bearing, the lead screw is flexibly connected with bearing and lead screw energy
Relative axle forward it is dynamic, the driving component is connected with lead screw and driving assembly can be forwarded for lead screw relative axle it is dynamic power is provided, institute
It states driving assembly to be connected with control system, the feed screw nut is arranged on lead screw；
The guide and limit unit includes the first guide rail, sliding block, the first sprue connecting rod, the second guide rail, the second sprue connecting rod, described
First guide rail is arranged in the connecting rod being connected with bearing, and the sliding block is connected with the first guide rail, the sliding block and feed screw nut
It is connected and feed screw nut energy band movable slider is mobile relative to the first guide rail, the sliding block passes through the first sprue connecting rod and sprue unit phase
Even and sliding block can provide power for sprue unit motion, and second guide rail is connected with a connecting rod, and second sprue connects
The both ends of bar are connected respectively with the second guide rail, sprue unit and the second guide rail, the second sprue connecting rod can play sprue unit and lead
To effect；
The sprue unit includes sprue, sliding sleeve, the first sprue connecting rod, the second sprue connecting rod respectively with sprue phase
Even, the sliding sleeve is arranged on sprue.
2. sprue mobile device according to claim 1, which is characterized in that the installation unit further includes limit card block,
The connecting rod, limit card block are respectively two, are provided with the card slot matched with connecting rod and company in the bracket connection ring
Extension bar can be stuck in the card slot of bracket connection ring, and the limit card block is connected respectively with connecting rod, bracket connection ring and limiting card
Connecting rod and bracket connection ring can be connected together by block.
3. sprue mobile device according to claim 2, which is characterized in that the bracket connection ring passes through screw and bracket
Flange be connected.
4. described in any item sprue mobile devices according to claim 1 ~ 3, which is characterized in that the driving component includes stepping
Motor, the stepper motor are connected with lead screw, and the stepper motor is connected with control system.
5. sprue mobile device according to claim 4, which is characterized in that the driving component further includes shaft coupling, institute
Stepper motor is stated to be connected by shaft coupling with lead screw.
6. sprue mobile device according to claim 1, which is characterized in that first guide rail is square rail, described
Second guide rail is drawer guideway.
7. described in any item sprue mobile devices according to claim 1 ~ 6, which is characterized in that the sprue unit further includes copper
Set, the copper are set in sliding sleeve.
8. the application of the sprue mobile device according to claim 1 ~ 6, which is characterized in that be used for the bracket of wind tunnel test
In interference variance assessment.
9. application according to claim 8, which comprises the steps of:
(1) sprue mobile device is installed；
(2) during blowing, control system issues signal to driving assembly, and driving assembly drives sprue to be moved to setting position
It sets；According to sets requirement, driving assembly drives sprue repeatedly to be moved, until the movement of sprue position meets sets requirement；
(3) in the sprue moving process of step 2, by the full machine resistance of balance measurement model, and the bottom intracavitary by model tail
Pressure pipe measurement model base pressure；Based on the movement of sprue in step 2, corresponding model base pressure and the full machine resistance of model are obtained, and is intended
Close out the functional relation of model base pressure Yu the full machine resistance of model.
10. application according to claim 9, which is characterized in that in the step 2, sprue is moved towards bracket from the distant to the near
Dynamic, movement stops setting time afterwards in place, then is moved next time.
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| CN201910338482.4A CN109946037B (en) | 2019-04-25 | 2019-04-25 | Blocking moving device for simulating bracket interference quantity change and application |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112729763A (en) * | 2021-04-06 | 2021-04-30 | 中国空气动力研究与发展中心高速空气动力研究所 | Symmetric pasting quantitative pressurizing device for wind tunnel balance |
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