CN108375449A - The caliberating device and scaling method of the differential pressure measurement device of friction stree are measured indirectly - Google Patents
The caliberating device and scaling method of the differential pressure measurement device of friction stree are measured indirectly Download PDFInfo
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- CN108375449A CN108375449A CN201810123062.XA CN201810123062A CN108375449A CN 108375449 A CN108375449 A CN 108375449A CN 201810123062 A CN201810123062 A CN 201810123062A CN 108375449 A CN108375449 A CN 108375449A
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L25/00—Testing or calibrating of apparatus for measuring force, torque, work, mechanical power, or mechanical efficiency
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Abstract
The present invention relates to a kind of caliberating devices of the differential pressure measurement device of indirect measurement friction stree, including flow field channel, differential pressure measurement device to be calibrated, differential pressure measurement device fixed part and multiple pitots；The probe portion of multiple pitots stretches into flow field channel；Differential pressure measurement device includes measurement head and differential pressure pickup, and measurement head is equipped with pressure measurement straight hole and pressure measurement inclined hole, and two measurement portions of differential pressure pickup measure the air pressure in pressure measurement straight hole and pressure measurement inclined hole respectively；Measurement head is mounted on by differential pressure measurement device fixed part on the side wall of flow field channel, and after installation, inlet end is flushed with the inner surface of flow field channel, and the flow field between two pitots is connected to, the inclined direction of flow met to flow field of pressure measurement inclined hole.The present invention also provides a kind of scaling methods of the differential pressure measurement device of indirect measurement friction stree.The present invention realizes the calibration to differential pressure measurement device, can accurately measure friction stree under the measuring environment of high temperature and high speed.
Description
Technical field
The present invention relates to sensor technical fields, more particularly to measure the calibration of the differential pressure measurement device of friction stree indirectly
Device and scaling method.
Background technology
Frictional resistance is very big for flow field and in the object contributions of flow, is a key measurement target.It surveys
The method that frictional resistance generally use indirect type measures is measured, such as can find out frictional resistance by measurement pressure difference calculating or rub and answer
Power.But conventional differential pressure pickup or pressure sensor can not adapt to the extreme measuring environment of high temperature and high speed, therefore cannot use.
And the sensor that indirect type measures friction stree can not immediately arrive at frictional resistance or friction stree, it is therefore desirable to pass through calibration
Establish the correspondence between measurement amount and frictional resistance or friction stree.
Invention content
(1) technical problems to be solved
The object of the present invention is to provide a kind of caliberating device of differential pressure measurement device of indirect measurement friction stree and calibration
Method realizes the calibration to differential pressure measurement device, can be under the measuring environment of high temperature and high speed, and accurate measurement friction is answered
Power.
(2) technical solution
In order to solve the above technical problem, the present invention provides a kind of differential pressure measurement devices of indirect measurement friction stree
Caliberating device, including：Flow field channel, differential pressure measurement device to be calibrated, differential pressure measurement device fixed part and multiple pitots；
The probe portion of multiple pitots stretches into the flow field channel, meets the direction of flow to calibration flow field；
The differential pressure measurement device includes measurement head and differential pressure pickup, and the measurement head is equipped with pressure measurement straight hole and pressure measurement
Inclined hole, two measurement portions of the differential pressure pickup measure the air pressure in the pressure measurement straight hole and the pressure measurement inclined hole respectively；
The measurement head is mounted on by the differential pressure measurement device fixed part on the side wall of the flow field channel, and is being pacified
After dress, the end face where the inlet end of the pressure measurement straight hole and the pressure measurement inclined hole is flushed with the inner surface of the flow field channel,
The calibration between the inlet end of the pressure measurement straight hole and the pressure measurement inclined hole and two pitots is connected to flow field, institute
Direction of flow of the inlet end line perpendicular to the calibration flow field of pressure measurement straight hole and the pressure measurement inclined hole is stated, the pressure measurement is oblique
The inclined direction of flow met to the calibration flow field in hole.
Preferably, the probe portion of multiple pitots stretches into the depth of the flow field channel along the calibration flow field
Direction of flow successively increases.
Preferably, the differential pressure measurement device fixed position is in the central area on the adjacent side wall of the pitot.
Preferably, the measurement head is made of heat safe metal or alloy.
Preferably, the flow field channel is made of material identical with the measurement head.
Preferably, the direction of flow angular range in the pressure measurement inclined hole and the calibration flow field is 25 °~70 °.
Preferably, minimum range ranging from 0~20mm between the pressure measurement straight hole and the inlet end of the pressure measurement inclined hole；
The pressure measurement straight hole and the pressure measurement inclined hole are the equal circular hole of diameter, and diameter range is 0.1~2mm；The pressure measurement straight hole and
The length range of the pressure measurement inclined hole is 10~20mm.
Preferably, the differential pressure measurement device further includes two pressure output connectors, two of the differential pressure pickup
Measurement portion is connect by the pressure output connector with the pressure measurement straight hole and the pressure measurement inclined hole respectively.
Preferably, it is equipped between the pressure measurement straight hole and the outlet side and the pressure output connector of the pressure measurement inclined hole
Pressure connecting channels；The output end of the pressure connecting channels is equipped with sealing screw thread, the pressure output connector and the pressure
Power interface channel is threadedly coupled.
The present invention also provides a kind of scaling methods of the differential pressure measurement device of indirect measurement friction stree, using such as above-mentioned
Any one of them caliberating device is demarcated, and is included the following steps：
The calibration flow field being located in the flow field channel is provided using wind-tunnel or wind turbine；
Under the environment different in flow rate in the calibration flow field, the calibration is in control by the air speed and is flowed through with flow field
The friction stree at differential pressure measurement device institute pressure measurement difference is calculated in the forward and backward flow velocity of the differential pressure measurement device；
Differential pressure measurement device institute pressure measurement difference and the relational expression of the friction stree at its pressure measurement difference are：
In relational expression：Δ P is pressure difference, and A and B are constant to be calibrated, τwFor friction stree, ρ is current density, and μ is power
Viscosity, h are characterized height, are determined by the structure of the differential pressure measurement device,D is the diameter of the pressure measurement inclined hole, θ
For the angle between the pressure measurement inclined hole and the direction of flow in the calibration flow field；
According to the obtained friction stree, pass through differential pressure measurement device institute pressure measurement difference and rubbing at its pressure measurement difference
The relational expression for wiping stress, obtains the relational expression of at least two A and B, solves the numerical value of A and B.
(3) advantageous effect
The above-mentioned technical proposal of the present invention has the following advantages that：The present invention provides a kind of pressures of indirect measurement friction stree
The caliberating device and scaling method of difference measuring device are solved differential pressure measurement device and are surveyed by the measurement in calibration flow field
The relational expression of pressure difference and the friction stree at its pressure measurement difference, realizes the calibration to differential pressure measurement device, can be in height
Accurate skin friction stress is measured under the measuring environment of warm high speed.
Description of the drawings
Fig. 1 is the structural schematic diagram of measurement head in the embodiment of the present invention；
Fig. 2 is the line A-A sectional view in Fig. 1；
Fig. 3 is the line B-B sectional view in Fig. 1；
Fig. 4 is the structural schematic diagram of pressure output connector in the embodiment of the present invention；
Fig. 5 is after the measurement head of differential pressure measurement device and pressure output connector device are matched in the embodiment of the present invention, and line A-A cuts open
Face schematic diagram；
Fig. 6 is after the measurement head of differential pressure measurement device and pressure output connector device are matched in the embodiment of the present invention, and line B-B cuts open
Face schematic diagram；
Fig. 7 is that apparatus structure schematic diagram is demarcated in the embodiment of the present invention；
Fig. 8 is the line D-D sectional view in Fig. 7；
Fig. 9 is the top view of caliberating device in the embodiment of the present invention；
In figure：1：Measurement head；11：Pressure measurement inclined hole；12：Pressure measurement straight hole；13：Seal screw thread；14：Pressure connecting channels；15：
Mounting-positioning holes；2：Pressure output connector；3：Flow field channel；4：Pitot；41：Pitot guide pile；5：Differential pressure measurement fills
Set fixed part.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The every other embodiment that member is obtained without making creative work, shall fall within the protection scope of the present invention.
The present invention provides a kind of caliberating devices of the differential pressure measurement device of indirect measurement friction stree, wherein to be calibrated
Differential pressure measurement device measuring principle it is as follows：The pressure tap of two types is designed, one of them is pressure measurement straight hole 12, and measurement can
Flow field channel Surface Static Pressure is obtained, another is pressure measurement inclined hole 11, and measuring can obtain with the stagnation pressure centainly lost, pass through pressure difference sensing
Device measures the pressure difference of two pressure taps, measures the pressure difference of gained and the friction stree of measured place there are correspondence, for friction
Stress τw, i.e., the frictional resistance in unit area, τwThe correspondence of pressure differential deltap P between two pressure taps is：
Work as reynolds number RehWhen smaller, viscous force accounts for leading, Δ P ∝ τw；
Work as reynolds number RehWhen larger, inertia force account for it is leading,
The relationship obtained between pressure difference and friction stree is represented by：
Wherein, ρ is current density, and μ is dynamic viscosity, and current density and dynamic viscosity can pass through the existing survey of the prior art
Amount device measures；H is characterized height, is determined by the structure of differential pressure measurement device,D is the pressure measurement inclined hole 11
Diameter, angles of the θ between the pressure measurement inclined hole 11 and the direction of flow in calibration flow field, A and B are constant to be calibrated, are led to
Cross the caliberating device and scaling method determination that the embodiment of the present invention is provided.
As shown in Figures 1 to 9, caliberating device provided in an embodiment of the present invention includes flow field channel 3, pressure difference to be calibrated survey
Measure device, differential pressure measurement device fixed part 5 and multiple pitots 4.Arrow in figure indicates the flowing in calibration flow field, that is, demarcates
With the direction of flow in flow field.
Differential pressure measurement device to be calibrated is as shown in Figures 1 to 6, including measurement head 1 and differential pressure pickup (do not show in figure
Go out), measurement head 1 is equipped with pressure measurement straight hole 12 and pressure measurement inclined hole 11, two measurement portions of differential pressure pickup respectively with pressure measurement straight hole
12 are connected to the outlet side in pressure measurement inclined hole 11, i.e., measure the air pressure in pressure measurement straight hole 12 and pressure measurement inclined hole 11 respectively.Wherein, it presses
Gap sensor is for measuring the pressure difference inputted by pressure measurement inclined hole 11 and pressure measurement straight hole 12, not doing further limit to it at this
It is fixed.Obviously, in other embodiments, can also respectively be measured by pressure measurement straight hole 12 and pressure measurement inclined hole using two pressure sensors
The pressure of 11 inputs, then the pressure difference of the two is calculated, it can realize the function of measuring two pressure tap pressure differences.
After installation, measurement head 1 is embedded at flow field channel 3, the end where the inlet end of pressure measurement straight hole 12 and pressure measurement inclined hole 11
Face is flushed with the inner surface of flow field channel, that is, the direction of flow in calibration flow field is located at pressure measurement straight hole 12 and pressure measurement inclined hole 11
Inlet end institute planar, avoids the shape of measurement head 1 from being interfered with flow field to be calibrated.
Differential pressure measurement device in the present embodiment uses embedded inclined pipe structrue, will not generate pneumatic thermal spike in use
Concentration phenomenon is held, therefore the differential pressure measurement device of the present embodiment can be used in high temperature and high speed environment working after calibration.
Measurement head 1 is directly connected to high temperature flow field when due to application, it is therefore preferred that measurement head 1 uses heat safe metal or alloy
It is made, such as stainless steel.
As shown in Figure 1 and Figure 5, the arrow in figure indicates the direction of flow in calibration flow field, and pressure measurement straight hole 12 and pressure measurement are oblique
Perpendicular to the direction of flow in calibration flow field, pressure measurement inclined hole 11 is inclined to meet to calibration flow field the line of the inlet end in hole 11
Direction of flow, the direction of flow angular range with calibration flow field are 25 °~70 °, preferably 60 °.
To ensure that pressure measurement straight hole 12 and pressure measurement inclined hole 11 be in same calibration flow field state, raising measurement accuracy, two
Smaller distance should be kept between the top of pressure tap, and more closer better, but can not possibly nothing due to designing upper two pressure taps
Limit is close, it is preferable that minimum range ranging from 0~20mm between 11 top of pressure measurement straight hole 12 and pressure measurement inclined hole.
When the diameter of pressure tap is too small, sensitivity is relatively low, can influence the sensitivity measured；When pressure measurement bore dia is excessive
When, pressure tap meeting interference flowing field influences the accuracy measured.To ensure that the sensitivity and accuracy of pressure difference measurements, pressure measurement are straight
Hole 12 and pressure measurement inclined hole 11 are the equal circular hole of diameter, and diameter range is 0.1~2mm, preferably 1mm.
The length of two pressure taps can also have an impact measurement accuracy, and the length of two pressure taps herein refers to surveying
Projected length of the length and pressure measurement inclined hole 11 in straightening hole 12 on 12 direction of pressure measurement straight hole.The too short meeting of the length of two pressure taps
Interference is generated to calibration flow field, it is too long to lead to the oversized of measurement head 1, it should not install, therefore, the length of two pressure taps
Degree is no less than 10mm, preferably 10~20mm.
In order to avoid measurement head 1 to change the shape of part to be measured as possible, reduce the arcing surface to part to be measured after measurement head 1 is assembled
The influence of degree, and then interfered caused by reducing stream field, the area that measurement head 1 is contacted with flow field should be as small as possible, and 1 table of measurement head
The degree of roughness in face should be consistent with part surface to be measured.As shown in Figure 1 to Figure 3, specific in the present embodiment, measurement head 1 is cylinder
Shape stainless steel metal part, diameter range are 20~30mm, preferably 20mm.Distinguish on the top of pressure measurement straight hole 12 and pressure measurement inclined hole 11
Both sides in the cylindrical metal part center of circle are set.Flange mounting portion is additionally provided in measurement head 1, flange installation position is in cylindrical gold
Belong to the bottom of part, be equipped with several mounting-positioning holes 15, for measurement head 1 to be fixedly installed to flow field channel, when installation should be true
Protect the position relationship between the direction of flow and pressure measurement straight hole 12 and pressure measurement inclined hole 11 in calibration flow field.Measurement head 1 is used with calibration
The relationship of flow field direction of flow is as shown in Fig. 1, Fig. 5 and Fig. 6.
Specifically, which further includes two pressure output connectors 2, and measurement head 1 is connected by pressure output
Measurement portion output pressure of the device 2 to differential pressure pickup is connect, the structure of pressure output connector 2 is as shown in Figure 4 and Figure 5.Pressure difference passes
Two measurement portions of sensor (not shown) are connected by pressure output connector 2 and pressure measurement straight hole 12 and pressure measurement inclined hole 11 respectively
It connects.
Preferably, as shown in Fig. 2, Fig. 3, Fig. 5 and Fig. 6, the outlet side of pressure measurement straight hole 12 and pressure measurement inclined hole 11 and pressure are defeated
Go out between connector 2 equipped with pressure connecting channels 14.The input terminal of pressure connecting channels 14 and pressure measurement straight hole 12 or pressure measurement inclined hole
11 outlet side connection, output end are equipped with sealing screw thread 13, and pressure connecting channels 14 are threadedly coupled with pressure output connector 2,
The sealed connection for ensureing pressure measurement straight hole 12 or pressure measurement inclined hole 11 and pressure output connector 2 makes pressure transmission access not by dry
It disturbs.
In caliberating device, the probe portion of multiple pitots 4 stretches into flow field channel 3, meets the incoming to calibration flow field
Direction, the flow velocity for detecting calibration flow field.
Differential pressure measurement device to be calibrated is mounted on by differential pressure measurement device fixed part 5 on the side wall of flow field channel 3, is surveyed
Calibration between the inlet end of straightening hole 12 and pressure measurement inclined hole 11 and two pitots 4 is connected to flow field, i.e. each pitot 4
Measured calibration flow field range should cover the calibration the surveyed flow field range at measurement head 1.In other words, at least one sky
Fast pipe 4 measures the calibration flow field for not flowing through measurement head 1, and at least one pitot 4 measures the calibration stream after flowing through measurement head 1
, provide accurate calibration flow field data for calibration.
Preferably, flow field channel 3 is made of material identical with measurement head 1, roughness and the measurement head 1 of inner surface
Roughness it is consistent.Specific in the present embodiment, flow field channel 3 is made of stainless steel structure, and longitudinal section is square, Ke Yishi
For various extreme calibration flow fields environments, higher temperature and stronger disturbance can be born, be unlikely to deform, and with this implementation
1 material of measurement head is identical used in example, is applicable to the calibration environment of high temperature.Flow field channel 3 is by the stainless steel by polishing
Plate is welded to connect, and weld smooth welding joint impulse- free robustness avoids interfering calibration with flow field.
As shown in Figure 7 and Figure 8, specific in the present embodiment, 4 small size L-type pitots 4 pass through pitot guide pile
41 are fixed on a side of flow field channel 3, and the probe portion of pitot 4 stretches into the depth of flow field channel 3 along calibration stream
The direction of flow of field successively increases, it is ensured that the pitot 4 for first touching calibration flow field does not interfere with the survey of posterior pitot 4
Amount, avoids interfering with each other between each pitot 4, influences the flowing in calibration flow field.Preferably, adjacent in 4 pitots 4
The distance of two pitots 4 is equal.
The flow velocity that calibration flow field is measured by multiple pitots 4, calibration is simulated with flow field flow line speed, can
True calibration flow field velocity change curve is obtained, more accurately to calculate friction stree.Obviously, in other embodiment
In, the number of pitot 4 can also be changed as needed.
Specific in the present embodiment, differential pressure measurement device fixed part 5 is in the plane on the side wall adjacent with pitot 4
Heart district domain, including measurement head guide pile and 4 positioning bolts.Measurement head guide pile is hollow structure, and end connects with flow field channel 3
Logical, positioning bolt is arranged on the top of measurement head guide pile.When installation, measurement head 1 is inserted into measurement head guide pile, is flowed with calibration
Field connection, positioning bolt are inserted into mounting-positioning holes 15 in measurement head 1 and fix measurement head 1.
By measuring temperature and pressure in the present embodiment, gas density and dynamic viscosity are measured indirectly.The table of current density
It is up to formula：
Wherein, ρ is current density, and P is air pressure, and T is temperature, and R is gas constant, the R=287J/kgK of air.
Dynamic viscosity is temperature and the parameter of gaseous species, and dynamic viscosity can be expressed with temperature and the relational expression of gaseous species
For：
Wherein, μ0Dynamic viscosity when being 15 DEG C, μ0=1.7894e-5, B is constant related with gaseous species, air
B=110.4K.
It is therefore preferred that caliberating device further includes temperature measuring equipment and surveys pneumatic shuttle, both of which is the prior art.It surveys
The optional pyrometer of device, thermal imaging system or thermocouple of amount temperature etc. measure optional pressure sensor of device of gas pressure etc..It is right
In the flow field of same state, current density and dynamic viscosity belong to stable atmospheric parameter, can be measured in the outside of flow field channel 3
And it calculates.
After being demarcated to differential pressure measurement device by caliberating device, A and B are obtained, establishes friction stree and differential pressure measurement
Device measures the true relation formula between the pressure difference of gained, which can be used to measure indirectly under high temperature environment
Friction stree or frictional resistance.
A kind of scaling method of the differential pressure measurement device of indirect measurement friction stree is additionally provided in the embodiment of the present invention, is adopted
It is demarcated, is specifically included with any of the above-described caliberating device：
The calibration flow field being located in flow field channel 3 is provided using wind-tunnel or wind turbine, calibration flow field is steady flow field.
Under the environment different in flow rate in calibration flow field, obtains demarcating by pitot 4 and flow through differential pressure measurement dress with flow field
Forward and backward flow velocity is set, the friction stree at differential pressure measurement device institute pressure measurement difference is calculated.
Specifically, it when solving friction stree, can be calculated according to the formula of theorem of kinetic energy and friction working.First really
The flow field velocity that flow field changes along grain direction is used in calibration surely, then calculates 3 surface of flow rate attenuation and flow field channel of this section
The acting of the relationship of frictional resistance, i.e. frictional resistance causes the flow field velocity in calibration flow field to reduce, and finally obtains this section of flow field
The frictional resistance curve in channel 3, friction stree are the frictional resistance on unit area.
Differential pressure measurement device institute's pressure measurement difference and the relational expression of the friction stree at its pressure measurement difference to be calibrated be：
In relational expression：Δ P is pressure difference, and A and B are constant to be calibrated, τwFor friction stree, ρ is current density, and μ is power
Viscosity, h are characterized height, are determined by the structure of differential pressure measurement device,D is the diameter of pressure measurement inclined hole, and θ is that pressure measurement is oblique
Angle between hole and the direction of flow in calibration flow field.
According to obtained friction stree, pass through the friction stree at differential pressure measurement device institute's pressure measurement difference and its pressure measurement difference
Relational expression obtains the relational expression of at least two A and B, solves the numerical value of A and B.Wherein, the current density in calibration flow field and dynamic
Power viscosity can carry out technology by measuring device in the prior art.
The relational expression for obtaining two A and B solves the numerical value of A and B using linear equation in two unknowns group.Preferably, may be used also
After numerical value to solve A and B again, the relational expression of third A and B is obtained with flow field by calibration different in flow rate, brings into and passes through pressure
Difference measuring device institute pressure measurement difference is checked with the friction stree at its pressure measurement difference.
In the relationship of mark Timing measurement multigroup friction stree and pressure difference, the function curve of friction stree and pressure difference can be obtained,
By the relational expression of institute's pressure measurement difference and the friction stree of its pressure measurement difference it is found that the function curve is through zero crossing, and solves section and lead
Number is just.Therefore, it when solving friction stree, takes by the ascending power section of (0,0) point in curve, and in first interval
Solution.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
With technical scheme described in the above embodiments is modified or equivalent replacement of some of the technical features；
And these modifications or replacements, various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (10)
1. a kind of caliberating device of the differential pressure measurement device of indirect measurement friction stree, which is characterized in that including：Flow field channel,
Differential pressure measurement device, differential pressure measurement device fixed part and multiple pitots to be calibrated；
The probe portion of multiple pitots stretches into the flow field channel, meets the direction of flow to calibration flow field；
The differential pressure measurement device includes measurement head and differential pressure pickup, and the measurement head is equipped with pressure measurement straight hole and pressure measurement is oblique
Hole, two measurement portions of the differential pressure pickup measure the air pressure in the pressure measurement straight hole and the pressure measurement inclined hole respectively；
The measurement head is mounted on by the differential pressure measurement device fixed part on the side wall of the flow field channel, and is being installed
Afterwards, the end face where the inlet end of the pressure measurement straight hole and the pressure measurement inclined hole is flushed with the inner surface of the flow field channel, institute
The inlet end for stating pressure measurement straight hole and the pressure measurement inclined hole is connected to the calibration between two pitots with flow field, described
The inlet end line of pressure measurement straight hole and the pressure measurement inclined hole is perpendicular to the direction of flow in the calibration flow field, the pressure measurement inclined hole
The inclined direction of flow met to the calibration flow field.
2. caliberating device according to claim 1, it is characterised in that：The probe portion of multiple pitots stretches into the stream
Direction of flow of the depth in field channel along calibration flow field successively increases.
3. caliberating device according to claim 2, it is characterised in that：The differential pressure measurement device fixed position is in the sky
Speed manages the central area on adjacent side wall.
4. caliberating device according to claim 1, it is characterised in that：The measurement head uses heat safe metal or alloy
It is made.
5. caliberating device according to claim 4, it is characterised in that：The flow field channel is using identical as the measurement head
Material be made.
6. caliberating device according to claim 1, it is characterised in that：The pressure measurement inclined hole and the calibration with flow field come
Flow ranging from 25 °~70 ° of angular separation.
7. caliberating device according to claim 6, it is characterised in that：The air inlet of the pressure measurement straight hole and the pressure measurement inclined hole
Minimum range ranging from 0~20mm between end；The pressure measurement straight hole and the pressure measurement inclined hole are the equal circular hole of diameter, diameter
Ranging from 0.1~2mm；The length range of the pressure measurement straight hole and the pressure measurement inclined hole is 10~20mm.
8. caliberating device according to claim 7, it is characterised in that：The differential pressure measurement device further includes that two pressure are defeated
Go out connector, two measurement portions of the differential pressure pickup respectively by the pressure output connector and the pressure measurement straight hole and
The pressure measurement inclined hole connection.
9. caliberating device according to claim 8, it is characterised in that：The outlet of the pressure measurement straight hole and the pressure measurement inclined hole
Pressure connecting channels are equipped between end and the pressure output connector；The output end of the pressure connecting channels is equipped with sealing spiral shell
Line, the pressure output connector are threadedly coupled with the pressure connecting channels.
10. a kind of scaling method of the differential pressure measurement device of indirect measurement friction stree, which is characterized in that using such as claim
1-9 any one of them caliberating devices are demarcated, and are included the following steps：
The calibration flow field being located in the flow field channel is provided using wind-tunnel or wind turbine；
Under the environment different in flow rate in the calibration flow field, by the air speed be in control the calibration flowed through with flow field it is described
The friction stree at differential pressure measurement device institute pressure measurement difference is calculated in the forward and backward flow velocity of differential pressure measurement device；
Differential pressure measurement device institute pressure measurement difference and the relational expression of the friction stree at its pressure measurement difference are：
In relational expression：Δ P is pressure difference, and A and B are constant to be calibrated, τwFor friction stree, ρ is current density, and μ is dynamic viscosity, h
It is characterized height, is determined by the structure of the differential pressure measurement device,D is the diameter of the pressure measurement inclined hole, and θ is described
Angle between pressure measurement inclined hole and the direction of flow in the calibration flow field；
According to the obtained friction stree, answered by differential pressure measurement device institute pressure measurement difference and the friction at its pressure measurement difference
The relational expression of power obtains the relational expression of at least two A and B, solves the numerical value of A and B.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114608793A (en) * | 2022-05-10 | 2022-06-10 | 中国空气动力研究与发展中心设备设计与测试技术研究所 | Static pressure measuring device for wind tunnel and static pressure measuring method thereof |
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