CN109238738A - Special vehicle cooling air quantity test device and method based on testability grid - Google Patents
Special vehicle cooling air quantity test device and method based on testability grid Download PDFInfo
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- CN109238738A CN109238738A CN201810932252.6A CN201810932252A CN109238738A CN 109238738 A CN109238738 A CN 109238738A CN 201810932252 A CN201810932252 A CN 201810932252A CN 109238738 A CN109238738 A CN 109238738A
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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
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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Abstract
The present invention relates to a kind of special vehicle cooling air quantity test devices and method based on testability grid, are related to Vehicle Engineering technical field.The present invention carries out Testability Design to the air-inlet grille of vehicle, can not only test to obtain the cooling air quantity information of vehicle, also combine together with air-inlet grille, not additional test equipment does not influence the inlet flow area of vehicle.
Description
Technical field
The present invention relates to Vehicle Engineering technical fields, and in particular to a kind of special vehicle based on testability grid is cooling
Wind quantity test device and method.
Background technique
The growth of the heat dissipation capacity of special vehicle cooling system at double at present, and the increase of cooling system of vehicle arrangement space
Extremely limited, so that the design difficulty for bringing cooling system of vehicle is growing day by day, traditional design of Cooling System cannot expire
Sufficient demand.And cooling air quantity is the determinant for determining a design of Cooling System, cooling effect quality.
The test method of traditional special vehicle cooling air quantity be using anemobiagraph or hot line instrument to air-inlet grille windward
The test that face is pinpointed since the motion vector of vehicle cooling air quantity is non-uniform, thus uses traditional test method
Biggish error can be generated, in actual use, it will usually cause cooling air quantity to be unsatisfactory for design value, so as to cause cooling
System performance degradation causes vehicle trouble, influences vehicle normal use.If a kind of air inlet grille with test function can be designed
Grid can accurately test the size of cooling air quantity in the case where not increasing extra means in real time, pre- so as to reach
First judge whether cooling system of vehicle works normally, thus driver can be made to remain to vehicle cooling performance information
Grasp.Great convenience also is brought for the fault diagnosis of vehicle and health control simultaneously.
Summary of the invention
(1) technical problems to be solved
The technical problem to be solved by the present invention is how to design a kind of dedicated testability grid device of special vehicle, use
To test the cooling air quantity of vehicle.
(2) technical solution
In order to solve the above-mentioned technical problems, the present invention provides a kind of special vehicle cooling winds based on testability grid
Test device, the two groups of apparatus for measuring air quantity installed including air-inlet grille and on air-inlet grille are measured, two groups of air quantity are surveyed
It is positioned opposite to measure device；Wherein, apparatus for measuring air quantity described in every group includes that multiple wind speed and winds for being equidistantly spaced from measure pieces 4, more
A stagnation pressure tube 2, multiple static tubes 3 and a pressure difference meter, wind speed and wind measurement piece 4 is identical as stagnation pressure tube 2,3 quantity of static tube, point
Not one-to-one connection, the dynamic pressure interface that wind speed and wind measures piece 4 connect 2 one end of stagnation pressure tube, and static pressure interface connects 3 one end of static tube,
Multiple 2 other ends of stagnation pressure tube, 3 other end of multiple static tubes be all connected to a pressure difference meter, the multiple to be equidistantly spaced from
Wind speed and wind measures piece 4 and replaces original a part of branch grille blades on air-inlet grille, interts arrangement with the grille blades of reservation.
The present invention also provides a kind of the special vehicle cooling air quantity test macro based on testability grid, the system
It further include being arranged above the air-inlet grille for being equipped with two groups of apparatus for measuring air quantity including device as described in claim 1
Twisted-pair cable collector so that cooling wind passes through at the top of twisted-pair cable collector flows to bottom, and is included in twisted-pair cable collector
Along a certain number of Pitot tubes that parallel airflow direction is arranged according to equal-area method, to measure induction air flow ratio.
Preferably, the system also includes heat radiator assemblies.
Preferably, the system also includes fan spiral cases.
Preferably, the system also includes power assembly devices.
Invention further provides a kind of methods for carrying out the test of special vehicle cooling air quantity using the system, including with
Lower step:
Firstly, it is flat to respectively obtain air-inlet grille by all stagnation pressure tubes 2 and all static tubes 3 in real vehicle actual condition
Equal stagnation pressure p0And average static pressure p, signal are transferred to pressure difference meter 1, to obtain the average dynamic pressure p of air-inlet grille0-p；It utilizes
Formula:
Obtain the average cooling gas flow velocity U under real vehicle actual condition1, wherein ρ is atmospheric density；
Then, the system then in laboratory is arranged, when Pitot tube is not inserted into flow field, if on twisted-pair cable collector
The cooling gas flow velocity of certain point is u0, static pressure p ', in order to measure the flow velocity of the point on twisted-pair cable collector, by Pitot tube top
The aperture A at end is directed at this measurement point, and keeps Pitot tube axis parallel with flow direction, at this moment, due to inserting Pitot tube, the stream of A point
Speed is zero by stagnation, and pressure rises to stagnation pressure p by original static pressure p '0', p0' not only contain the original static pressure of fluid
P ', and further comprise the part that static pressure is converted by fluid dynamic energy；
For A point along the surveyed cooling gas flow velocity u of another Pitot tube in parallel airflow direction downstream, it is listed below relationship
Formula:
So
It is right on this basis so as to obtain the average cooling gas flow velocity u ' that all Pitot tubes under identical operating condition measure
Than the air speed data of amendment real vehicle acquisition.
Preferably, the step of air speed data of the comparison amendment real vehicle acquisition specifically: repaired according to correction factor α
Just, revised velocity formula is obtained are as follows: U1'=α u ', uses U1To mark U1', to obtain U under real vehicle actual condition1Cooling
Air duct gas flow, wherein α is Pitot tube cofficients.
(3) beneficial effect
The device of the invention design considers in practical real vehicle field trial for cooling air channel under actual working conditions
Air inlet air quantity does not have acquiring way and general air inlet air volume test system is not applied for the factor of condition of external field, therefore selects
It selects using by being re-designed as testability air-inlet grille to piggyback pod air-inlet grille, air-inlet grille is averagely extracted several
Grille blades substitute and measure test piece for average formula wind speed and wind, due to the uncertainty and dispersibility and randomness of airflow direction
Phenomenon, while also by different model there is the generation of different leaves change in shape to be influenced, in the design process, carry out based on test
Rack air flow calibration process obtains the testability grid features localization parameter of specific structure parameter, on this calibrating parameters basis
Relationship between the measured value of upper fitting amendment testability grid and practical true air quantity, enables the device to realize for real
The wind quantity test under the dynamic operation condition of outfield is carried out on the air-inlet grille real vehicle of border.Further for piggyback pod velocity field inside laboratory
Air flow calibration, using two-dimensional laser Laser Doppler Technique For Measuring Velocity, design double is turned round by testable above piggyback pod air-inlet grille
Line gas collecting apparatus can be tested by the wind quantity test result to vehicle power flow field out of my cabin to demarcate under the different rotation speed of the fan of amendment
The measured value of personality grid.
Detailed description of the invention
Fig. 1 is air quantity testability grid device structural schematic diagram, and wherein a is overall structure diagram, and b is the wind in a
Fast air quantity surveys chip architecture schematic diagram；
Fig. 2 is laboratory's inside air flow calibration air flow calibration test-bed schematic device that the present invention designs.
Specific embodiment
To keep the purpose of the present invention, content and advantage clearer, with reference to the accompanying drawings and examples, to of the invention
Specific embodiment is described in further detail.
As shown in Figure 1, the present invention provides a kind of special vehicle cooling air quantity test device based on testability grid,
The present apparatus installs two groups of apparatus for measuring air quantity, two groups of air measuring dresses by improving to air-inlet grille on air-inlet grille
It sets positioned opposite.Wherein, insertion wind speed and wind measures piece, is installed on real vehicle cooling air channel air inlet, and multiple wind speed and winds measure piece 4 etc.
Alternate arrangement.Apparatus for measuring air quantity described in every group include it is multiple at equal intervals intert arrangement wind speed and winds measure piece 4 (replace into
Original a part of branch grille blades on gas grid intert arrangement with the grille blades of reservation), multiple stagnation pressure tubes 2, multiple static pressure
Pipe 3 and a pressure difference meter, wind speed and wind measurement piece 4 is identical as stagnation pressure tube 2,3 quantity of static tube, respectively one-to-one connection, wind speed
Dynamic pressure interface connection 2 one end of stagnation pressure tube of air quantity survey piece 4, static pressure interface connection 3 one end of static tube, multiple 2 other ends of stagnation pressure tube,
Multiple 3 other ends of static tube are all connected to a pressure difference meter.
As shown in Fig. 2, extraordinary the present invention also provides being carried out using special vehicle cooling air quantity test device shown in FIG. 1
The method of vehicle cooling air quantity test, comprising the following steps:
Firstly, it is flat to respectively obtain air-inlet grille by all stagnation pressure tubes 2 and all static tubes 3 in real vehicle actual condition
Equal stagnation pressure p0And average static pressure p, signal are transferred to pressure difference meter 1, to obtain the average dynamic pressure p of air-inlet grille0-p；It utilizes
Formula:
Obtain the average cooling gas flow velocity U under real vehicle actual condition1, wherein ρ is atmospheric density,
Then, then in laboratory, twisted-pair cable collection is installed above the air-inlet grille for being equipped with two groups of apparatus for measuring air quantity
It flows device (for empty barrel shape), so that cooling wind passes through at the top of twisted-pair cable collector flows to bottom, and the edge in twisted-pair cable collector
Parallel airflow direction arrange a certain number of Pitot tubes to measure induction air flow ratio (on twisted-pair cable collector according to equal-area method
The flow velocity of one point is measured with a Pitot tube, is one-to-one relationship), to form air flow calibration test-bed (radiator
Assembly, fan spiral case, power assembly device are the existing apparatus in air flow calibration test-bed).When Pitot tube is not inserted into stream
When field, if the cooling gas flow velocity of certain point is u on twisted-pair cable collector0, static pressure p '.In order to measure on twisted-pair cable collector
The aperture A on Pitot tube top is directed at this measurement point by the flow velocity of the point, and keeps Pitot tube axis parallel with flow direction.At this moment, due to
Pitot tube is inserted, the flow velocity of A point is zero by stagnation, and pressure rises to stagnation pressure p by original static pressure p '0’。p0' not only wrap
Contain the original static pressure p ' of fluid, and further comprises the part for being converted into static pressure by fluid dynamic energy.
According to the Bernoulli equation of ideal incompressible fluid, for A point along the another of parallel airflow direction downstream
The surveyed cooling gas flow velocity u of Pitot tube, can be listed below relational expression:
So
It is right on this basis so as to obtain the average cooling gas flow velocity u ' that all Pitot tubes under identical operating condition measure
Than the air speed data of amendment real vehicle acquisition.It is inconsistent due to Pitot tube pitot hole and static pressure hole site, during fluid stagnation
The factors such as energy loss mean flow rate u ' and pressure difference (p that Pitot tube is measured0- p) relationship cannot determine completely, and root
It is modified according to correction factor α (α is Pitot tube cofficients, demarcates to obtain by test apparatus).It is public to obtain revised flow velocity
Formula are as follows: U1'=α u ', uses U1To mark U1', to obtain U under real vehicle actual condition1Cooling air channel gas flow.
Test device of the present invention is to be based on having carried out testability Curve guide impeller to special vehicle air-inlet grille, using to original
The blade of the air-inlet grille of vehicle carries out interspersed arrangement, is subject to Testability Design, does not change former air-inlet grille shape to reach
Shape, can real steering vectors cooling air quantity, accurately and conveniently purpose.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of special vehicle cooling air quantity test device based on testability grid, which is characterized in that including air-inlet grille
And the two groups of apparatus for measuring air quantity installed on air-inlet grille, two groups of apparatus for measuring air quantity are positioned opposite；Wherein, every group
The apparatus for measuring air quantity includes that multiple wind speed and winds being equidistantly spaced from measure piece (4), multiple stagnation pressure tubes (2), multiple static tubes
(3) and a pressure difference meter, wind speed and wind measure piece (4) it is identical with stagnation pressure tube (2), static tube (3) quantity, distinguish one-to-one company
It connects, the dynamic pressure interface that wind speed and wind measures piece (4) connects stagnation pressure tube (2) one end, and static pressure interface connects static tube (3) one end, multiple
Stagnation pressure tube (2) other end, multiple static tubes (3) other end be all connected to a pressure difference meter, the multiple to be equidistantly spaced from
Wind speed and wind measures original a part of branch grille blades on piece (4) replacement air-inlet grille, interts arrangement with the grille blades of reservation.
2. a kind of special vehicle cooling air quantity test macro based on testability grid, which is characterized in that the system comprises
Device as described in claim 1 further includes the double torsions arranged above the air-inlet grille for being equipped with two groups of apparatus for measuring air quantity
Line collector so that cooling wind passes through at the top of twisted-pair cable collector flows to bottom, and be included in twisted-pair cable collector along
A certain number of Pitot tubes that parallel airflow direction is arranged according to equal-area method, to measure induction air flow ratio.
3. system as claimed in claim 2, which is characterized in that the system also includes heat radiator assemblies.
4. system as claimed in claim 2, which is characterized in that the system also includes fan spiral cases.
5. system as claimed in claim 2, which is characterized in that the system also includes power assembly devices.
6. a kind of method for carrying out the test of special vehicle cooling air quantity using system described in any one of claim 2 to 5,
It is characterized in that, comprising the following steps:
Firstly, it is flat to respectively obtain air-inlet grille by all stagnation pressure tubes (2) and all static tubes (3) in real vehicle actual condition
Equal stagnation pressure p0And average static pressure p, signal are transferred to pressure difference meter (1), to obtain the average dynamic pressure p of air-inlet grille0-p；Benefit
With formula:
Obtain the average cooling gas flow velocity U under real vehicle actual condition1, wherein ρ is atmospheric density；
Then, the system then in laboratory is arranged, when Pitot tube is not inserted into flow field, if a certain on twisted-pair cable collector
The cooling gas flow velocity of point is u0, static pressure p ', in order to measure the flow velocity of the point on twisted-pair cable collector, by Pitot tube top
Aperture A is directed at this measurement point, and keeps Pitot tube axis parallel with flow direction, at this moment, due to inserting Pitot tube, the flow velocity quilt of A point
Stagnation is zero, and pressure rises to stagnation pressure p by original static pressure p '0', p0' the original static pressure p ' of fluid is not only contained,
And further comprise the part that static pressure is converted by fluid dynamic energy；
For A point along the surveyed cooling gas flow velocity u of another Pitot tube in parallel airflow direction downstream, it is listed below relational expression:
So
So as to obtain the average cooling gas flow velocity u ' that all Pitot tubes under identical operating condition measure, comparison is repaired on this basis
The air speed data of positive real vehicle acquisition.
7. method as claimed in claim 6, which is characterized in that described the step of comparing the air speed data that amendment real vehicle acquires has
Body are as follows: be modified according to correction factor α, obtain revised velocity formula are as follows: U1'=α u ', uses U1To mark U1', thus
U under to real vehicle actual condition1Cooling air channel gas flow, wherein α be Pitot tube cofficients.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810932252.6A CN109238738B (en) | 2018-08-16 | 2018-08-16 | Special vehicle cooling air volume testing device and method based on testability grating |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810932252.6A CN109238738B (en) | 2018-08-16 | 2018-08-16 | Special vehicle cooling air volume testing device and method based on testability grating |
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| CN109238738A true CN109238738A (en) | 2019-01-18 |
| CN109238738B CN109238738B (en) | 2020-07-17 |
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| CN201810932252.6A Active CN109238738B (en) | 2018-08-16 | 2018-08-16 | Special vehicle cooling air volume testing device and method based on testability grating |
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| CN111624010A (en) * | 2020-04-29 | 2020-09-04 | 国网河南省电力公司电力科学研究院 | Operation detection method, system and device for blockage of air preheater |
| CN112665871A (en) * | 2020-12-10 | 2021-04-16 | 奇瑞汽车股份有限公司 | System and method for testing air quantity of automobile front end cooling module |
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| CN112665871A (en) * | 2020-12-10 | 2021-04-16 | 奇瑞汽车股份有限公司 | System and method for testing air quantity of automobile front end cooling module |
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| CN109238738B (en) | 2020-07-17 |
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