CN110457799A - A kind of hot test device damping screen design method - Google Patents
A kind of hot test device damping screen design method Download PDFInfo
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- CN110457799A CN110457799A CN201910694533.7A CN201910694533A CN110457799A CN 110457799 A CN110457799 A CN 110457799A CN 201910694533 A CN201910694533 A CN 201910694533A CN 110457799 A CN110457799 A CN 110457799A
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- 238000013016 damping Methods 0.000 title claims abstract description 86
- 238000013461 design Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000012360 testing method Methods 0.000 title claims abstract description 27
- 239000000725 suspension Substances 0.000 claims abstract description 14
- 238000012545 processing Methods 0.000 claims description 5
- 230000000694 effects Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000012938 design process Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
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- General Engineering & Computer Science (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The application belongs to wind-tunnel technique field, it is related to a kind of hot test device damping screen design method, the method includes twine is assumed suspension cable, the amount of deflection maximum value of twine is determined using parabola theories in suspension cable model, under the conditions of this assumes, determine that twine becomes parabolical first length variation from straight line, and determine the variation of twine second length as caused by the tension of amount of deflection maximum, the variation of the third length as caused by temperature change, it then is the relationship of the sum of the variation of the second length and the variation of third length according to the variation of the first length, calculate the tension of twine amount of deflection maximum, so that it is determined that the maximum defluxion of twine, it is made to determine whether to carry out block design with the 3% of caliber D, finally calculate the maximum tension of twine, twine stress is calculated according to maximum tension and compared with twine allowable stress, check twine intensity.The application provides a kind of theoretical foundation for the design of hot test device damping screen, and the block design of damping screen can be carried out according to the design method, improves the accuracy of damping screen design.
Description
Technical field
The application belongs to wind-tunnel technique field, in particular to a kind of hot test device damping screen design method.
Background technique
The damping screen fairing important as wind-tunnel stable section or exerciser stable section, is typically mounted at after honeycomb
Further decrease the turbulence intensity of air-flow.Damping screen belongs to single layer flat screen, has the characteristics that flexibility is big, structural rigidity is small,
During the test of hot test device, damping screen easily deforms under temperature change and aerodynamic loading effect, and twine bears to draw
Stress.
Currently, it is less to the research of damping screen amount of deflection and twine stress under temperature change and aerodynamic loading effect, it is high
In warm exerciser damping screen design process, after selecting damping screen according to the pressure loss, it can only be damped by engineering experience
The block design of net.
Summary of the invention
One of in order to solve the above problem, present applicant proposes a kind of hot test device damping screen design methods, comprising:
Step S1, the aerodynamic loading being evenly arranged on damping screen twine is determined；
Step S2, twine is assumed into suspension cable, determines that the first length changes using parabola theories in suspension cable model；
Step S3, determine that twine second length as caused by the tension of amount of deflection maximum changes；
Step S4, determine that twine third length as caused by temperature change changes；
It step S5, is the sum of second length variation and third length variation according to first length variation
Relationship calculates the tension of twine amount of deflection maximum；
Step S6, the maximum defluxion of twine is determined；
Step S7, the maximum tension of twine is determined；
Step S8, the maximum tension determined according to step S7 calculates twine stress and compared with twine allowable stress, checks
Twine intensity.
Preferably, the aerodynamic loading that the determination is evenly arranged on damping screen twine includes:
Determine the aerodynamic loading F acted on damping screen；
Determine the twine number on unit width；
Determine the aerodynamic loading being evenly arranged on damping screen twine.
Preferably, further comprise after step S6:
Step S61, check whether maximum defluxion is more than the 3% of caliber D, it is right when maximum defluxion is more than the 3% of caliber D
The damping screen carries out the processing of intersecting parallels piecemeal；
Step S62, after piecemeal, the maximum defluxion of every piece of damping screen is recalculated, guarantees the maximum defluxion of every piece of damping screen
No more than the 3% of caliber D.
Preferably, in step S6, determine that the maximum defluxion of twine includes:
Using parabola theories in suspension cable model, amount of deflection and twine length and the position of the certain point of twine are determined
Relationship；
It is maximum in the amount of deflection of middle position according to twine, determine the amount of deflection maximum value of twine.
Preferably, in step S2, the variation of the first length are as follows:
Wherein, q is the aerodynamic loading being evenly arranged on damping screen twine, and l is twine length, and H is the tension of amount of deflection maximum.
Preferably, in step S3, the variation of the second length are as follows:
Wherein, S is the sectional area of twine, and E is elasticity modulus, and l is twine length, and H is the tension of amount of deflection maximum.
Preferably, in step S4, the variation of third length are as follows:
Δl2=α × Δ T × l
Wherein, α is the linear expansion coefficient of twine, and Δ T is temperature change, and l is twine length.
Preferably, in step S7, twine maximum tension are as follows:
Wherein, q is the aerodynamic loading being evenly arranged on damping screen twine, and l is twine length, and H is the tension of amount of deflection maximum.
Preferably, the hot test device damping screen design method further includes before step S1, according to the pressure loss
Damping screen is selected, determines damping screen percent opening.
The application provides a kind of theoretical foundation for the design of hot test device damping screen, can hinder according to the design method
The block design of Buddhist nun's net, designs more reasonable damping screen, improves the accuracy of damping screen design.
Detailed description of the invention
Fig. 1 is the application hot test device damping screen design method flow chart.
Specific embodiment
To keep the purposes, technical schemes and advantages of the application implementation clearer, below in conjunction with the application embodiment
In attached drawing, the technical solution in the application embodiment is further described in more detail.In the accompanying drawings, identical from beginning to end
Or similar label indicates same or similar element or element with the same or similar functions.Described embodiment is
A part of embodiment of the application, rather than whole embodiments.Embodiment below with reference to attached drawing description is to show
Example property, it is intended to for explaining the application, and should not be understood as the limitation to the application.Based on the embodiment in the application,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts belongs to this
Apply for the range of protection.Presently filed embodiment is described in detail with reference to the accompanying drawing.
The application's is designed to provide a kind of hot test device damping screen design method, solves hot test device damping screen
In design process, after selected damping screen, the block design of damping screen can only be carried out by engineering experience, does not have theoretical calculation side
Problem workable for method.
As shown in Figure 1, the application hot test device damping screen design method, main includes the selection of damping screen, damping screen
Three aspect of block design and damping screen strength check, wherein damping screen block design and damping screen strength check mainly wrap
It includes:
Step S1, the aerodynamic loading being evenly arranged on damping screen twine is determined；
Step S2, twine is assumed into suspension cable, determines that the first length changes using parabola theories in suspension cable model；
Step S3, determine that twine second length as caused by the tension of amount of deflection maximum changes；
Step S4, determine that twine third length as caused by temperature change changes；
It step S5, is the sum of second length variation and third length variation according to first length variation
Relationship calculates the tension of twine amount of deflection maximum；
Step S6, the maximum defluxion of twine is determined；
Step S7, the maximum tension of twine is determined；
Step S8, the maximum tension determined according to step S7 calculates twine stress and compared with twine allowable stress, checks
Twine intensity.
The specific design method of hot test device damping screen is as follows:
One, damping screen selects
Damping screen is selected according to the pressure loss, and determines damping screen percent opening β.
Two, damping screen block design
Damping screen in spherical, contacts with each other between twine under aerodynamic loading effect inside damping screen, generates contact and answers
Power, the whole overall stiffness thrown the net become larger, and twine presentation is non-linear, are calculated using analytic method, it is difficult to estimate nonlinear shadow
It rings, it is therefore assumed that not interacting between twine and twine.Moreover, it is assumed that there is no become caused by the reasons such as processing for damping screen
Shape.
In hot test device, it is assumed that the air velocity for flowing through damping screen is v0。
When air-flow flows through damping screen, the aerodynamic loading on damping screen is acted on are as follows:
Wherein, K is damping screen loss coefficient, and ρ is current density, and A is the damping screen area of plane.
According to the aerodynamic loading calculation formula acted on damping screen, derive that the uniform load acted on twine calculates
Formula are as follows:
Wherein, n is the twine number on 1m wide screen.
Twine is assumed into suspension cable, using parabola theories in suspension cable model, twine becomes parabola, length from straight line
Changes delta l are as follows:
Wherein, length when being straight line that l is twine, H are the tension of twine amount of deflection maximum.
Exerciser is run at high temperature, and not only the tension as suffered by twine causes for the length variation of twine, and temperature change also can
Twine length is caused to change.
Assuming that the variation of the length as caused by tension is Δ l1, for convenience of calculating, it is believed that the length variation of twine is by amount of deflection
Caused by the tension H of maximum, then the length changes delta l as caused by tension1Are as follows:
Wherein, S is the sectional area of twine, and E is elasticity modulus.
Assuming that the variation of the length as caused by temperature change is Δ l2, then the length changes delta l as caused by temperature change2Are as follows:
Δl2=α × Δ T × l (5)
Wherein, α is linear expansion coefficient, and Δ T is temperature change, and l is twine length.
It is Δ l according to twine length changes delta l1With Δ l2The sum of relationship, have formula:
24H3+24H2SE α Δ T=q2l2SE (6)
The tension H of twine amount of deflection maximum can be calculated according to formula (6).
Using parabola theories in suspension cable model, the Deflection Formula at any point on twine are as follows:
WhenWhen, the amount of deflection of twine is maximum, amount of deflection maximum value are as follows:
According to the statistics of low-speed wind tunnel, the maximum defluxion of damping screen is about the 2%~3% of caliber D, and damping screen maximum is scratched
Degree should not surpass the 3% of caliber D, if maximum defluxion is more than the 3% of caliber D, damping screen need to carry out intersecting parallels piecemeal processing, after piecemeal
The maximum defluxion for continuing to calculate every piece of damping screen by formula above guarantees when comprehensively considering installation and processing technology
Every piece of damping screen maximum defluxion is no more than the 3% of caliber D.
Three, damping screen twine strength check
Using parabola theories in suspension cable model, the tension T at any point on twine are as follows:
As x=0 or x=l, twine maximum tension TmaxAre as follows:
Acquire twine maximum tension TmaxAfterwards, twine stress can be calculatedWherein, S is twine sectional area.
By comparing calculated twine stress and twine allowable stress, judges whether damping screen twine intensity meets and want
It asks.
The application provides a kind of theoretical foundation for the design of hot test device damping screen, can hinder according to the design method
The block design of Buddhist nun's net, designs more reasonable damping screen, improves the accuracy of damping screen design.
The above, the only specific embodiment of the application, but the protection scope of the application is not limited thereto, it is any
Within the technical scope of the present application, any changes or substitutions that can be easily thought of by those familiar with the art, all answers
Cover within the scope of protection of this application.Therefore, the protection scope of the application should be with the scope of protection of the claims
It is quasi-.
Claims (9)
1. a kind of hot test device damping screen design method characterized by comprising
Step S1, the aerodynamic loading being evenly arranged on damping screen twine is determined；
Step S2, twine is assumed into suspension cable, determines that the first length changes using parabola theories in suspension cable model；
Step S3, determine that twine second length as caused by the tension of amount of deflection maximum changes；
Step S4, determine that twine third length as caused by temperature change changes；
It step S5, is the pass of the sum of second length variation and third length variation according to first length variation
System calculates the tension of twine amount of deflection maximum；
Step S6, the maximum defluxion of twine is determined；
Step S7, the maximum tension of twine is determined；
Step S8, the maximum tension determined according to step S7 calculates twine stress and compared with twine allowable stress, checks twine
Intensity.
2. hot test device damping screen design method as described in claim 1, which is characterized in that the determination is evenly arranged on damping
Aerodynamic loading on net twine includes:
Determine the aerodynamic loading F acted on damping screen；
Determine the twine number on unit width；
Determine the aerodynamic loading being evenly arranged on damping screen twine.
3. hot test device damping screen design method as described in claim 1, which is characterized in that further wrapped after step S6
It includes:
Step S61, check whether maximum defluxion is more than the 3% of caliber D, when maximum defluxion is more than the 3% of caliber D, to described
Damping screen carries out the processing of intersecting parallels piecemeal；
Step S62, after piecemeal, the maximum defluxion of every piece of damping screen is recalculated, guarantees that the maximum defluxion of every piece of damping screen does not surpass
Cross the 3% of caliber D.
4. hot test device damping screen design method as described in claim 1, which is characterized in that in step S6, determine twine
Maximum defluxion include:
Using parabola theories in suspension cable model, the pass of the amount of deflection and twine length and the position of the certain point of twine is determined
System；
It is maximum in the amount of deflection of middle position according to twine, determine the amount of deflection maximum value of twine.
5. hot test device damping screen design method as described in claim 1, which is characterized in that in step S2, the first length
Variation are as follows:
Wherein, q is the aerodynamic loading being evenly arranged on damping screen twine, and l is twine length, and H is the tension of amount of deflection maximum.
6. hot test device damping screen design method as described in claim 1, which is characterized in that in step S3, the second length
Variation are as follows:
Wherein, S is the sectional area of twine, and E is elasticity modulus, and l is twine length, and H is the tension of amount of deflection maximum.
7. hot test device damping screen design method as described in claim 1, which is characterized in that in step S4, third length
Variation are as follows:
Δl2=α × Δ T × l
Wherein, α is the linear expansion coefficient of twine, and Δ T is temperature change, and l is twine length.
8. hot test device damping screen design method as described in claim 1, which is characterized in that in step S7, twine is maximum
Tension are as follows:
Wherein, q is the aerodynamic loading being evenly arranged on damping screen twine, and l is twine length, and H is the tension of amount of deflection maximum.
9. hot test device damping screen design method as described in claim 1, which is characterized in that the hot test device damping
Net design method further includes selecting damping screen before step S1 according to the pressure loss, determining damping screen percent opening.
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Cited By (1)
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| CN114151139A (en) * | 2021-10-20 | 2022-03-08 | 中国航发四川燃气涡轮研究院 | Method for simulating flow of air film hole cold air layer on surface of turbine blade by adopting permeation model |
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| CN114151139A (en) * | 2021-10-20 | 2022-03-08 | 中国航发四川燃气涡轮研究院 | Method for simulating flow of air film hole cold air layer on surface of turbine blade by adopting permeation model |
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