CN109238738B - Special vehicle cooling air volume testing device and method based on testability grating - Google Patents
Special vehicle cooling air volume testing device and method based on testability grating Download PDFInfo
- Publication number
- CN109238738B CN109238738B CN201810932252.6A CN201810932252A CN109238738B CN 109238738 B CN109238738 B CN 109238738B CN 201810932252 A CN201810932252 A CN 201810932252A CN 109238738 B CN109238738 B CN 109238738B
- Authority
- CN
- China
- Prior art keywords
- air
- static pressure
- air volume
- vehicle
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention relates to a special vehicle cooling air volume testing device and method based on a testability grating, and relates to the technical field of vehicle engineering. The invention can test the air inlet grille of the vehicle, not only can test and obtain the cooling air volume information of the vehicle, but also can be integrated with the air inlet grille, has no additional test equipment and does not influence the air inlet circulation area of the vehicle.
Description
Technical Field
The invention relates to the technical field of vehicle engineering, in particular to a special vehicle cooling air volume testing device and method based on a testability grating.
Background
At present, the heat dissipation capacity of a special vehicle cooling system is increased in multiples, the arrangement space of the vehicle cooling system is increased extremely limitedly, the design difficulty of the vehicle cooling system is increased day by day, and the traditional cooling system design cannot meet the requirement. The cooling air volume is a determining factor for determining the design of a cooling system and the good and bad cooling effect.
The traditional method for testing the cooling air volume of the special vehicle is to utilize an anemometer or a hot wire meter to carry out fixed-point test on the windward side of an air inlet grille, and because the motion vector of the cooling air volume of the vehicle is uneven, the traditional test method can generate larger errors, and in the actual use process, the cooling air volume can not meet the design value usually, so that the performance of a cooling system is deteriorated, the vehicle fault is caused, and the normal use of the vehicle is influenced. If the air inlet grille with the test function can be designed, the cooling air volume can be accurately tested in real time under the condition that an additional device is not added, so that whether the vehicle cooling system works normally or not can be judged in advance, and a driver can always keep mastering the vehicle cooling performance information. Meanwhile, great convenience is brought to fault diagnosis and health management of the vehicle.
Disclosure of Invention
Technical problem to be solved
The technical problem to be solved by the invention is as follows: how to design a special testability grid device for special vehicles, which is used for testing the cooling air volume of the vehicles.
(II) technical scheme
In order to solve the technical problem, the invention provides a special vehicle cooling air volume testing device based on a testable grille, which comprises an air inlet grille and two sets of air volume measuring devices arranged on the air inlet grille, wherein the two sets of air volume measuring devices are arranged oppositely; each group of the air quantity measuring devices comprises a plurality of equally-spaced air speed and air quantity measuring sheets 4, a plurality of total pressure pipes 2, a plurality of static pressure pipes 3 and a micro-pressure difference meter, the air speed and air quantity measuring sheets 4 are the same in quantity with the total pressure pipes 2 and the static pressure pipes 3 and are respectively connected in a one-to-one mode, a dynamic pressure interface of each air speed and air quantity measuring sheet 4 is connected with one end of each total pressure pipe 2, each static pressure interface is connected with one end of each static pressure pipe 3, the other ends of the total pressure pipes 2 and the other ends of the static pressure pipes 3 are connected to the micro-pressure difference meter, and the equally-spaced air speed and air quantity measuring sheets 4 replace one part of original branch grid blades on an air inlet grid and are.
The invention also provides a special vehicle cooling air volume testing system based on the testability grille, which comprises the device as claimed in claim 1, and further comprises a twisted pair current collector arranged above the air inlet grille provided with the two groups of air volume measuring devices, so that cooling air passes through the top of the twisted pair current collector and flows to the bottom of the twisted pair current collector, and the twisted pair current collector comprises a certain number of pitot tubes arranged in the twisted pair current collector along the parallel air flow direction according to an equal area method, and is used for measuring the air inlet flow speed.
Preferably, the system further comprises a heat sink assembly.
Preferably, the system further comprises a fan volute.
Preferably, the system further comprises a powertrain device.
The invention also provides a method for testing the cooling air volume of the special vehicle by using the system, which comprises the following steps:
Firstly, in actual working conditions of the actual vehicle, the average total pressure p of the air inlet grille is respectively obtained through all the total pressure pipes 2 and all the static pressure pipes 3 0And an average static pressure p, the signal is transmitted to the micro differential pressure gauge 1, thereby obtaining an average dynamic pressure p of the air inlet grille 0-p; using the formula:
Obtaining the average cooling gas flow rate U under the actual working condition of the real vehicle 1Wherein ρ is the air density;
The system was then again placed in the laboratory and when the pitot tube was not inserted into the flow field, the cooling gas flow rate at a point on the twisted pair collector was set to u 0The static pressure is p', in order to measure the flow speed of the point on the twisted pair current collector, the small hole A at the top end of the pitot tube is aligned with the measuring point, and the axis of the pitot tube is parallel to the flow direction, at the moment, because the pitot tube is inserted, the flow speed of the point A is stopped to be zero, and the pressure rises to a stopping pressure p from the original static pressure p 0’，p0'not only contains the original static pressure p' of the fluid, but also contains the part converted from the kinetic energy of the fluid into the static pressure;
For another pitot tube measured cooling gas flow rate u downstream of point a in the parallel gas flow direction, the following relationship is set forth:
Therefore, the first and second electrodes are formed on the substrate, 
Therefore, the average cooling gas flow speed u 'measured by all the pitot tubes under the same working condition can be obtained, and the wind speed data collected by the real vehicle can be corrected by comparing the average cooling gas flow speed u' with the wind speed data.
preferably, the step of comparing and correcting the wind speed data acquired by the real vehicle is to correct the wind speed data according to a correction coefficient α to obtain a corrected flow speed formula U 1'α U' with U 1Mark aligning U 1', thereby obtaining U under the actual working condition of the real vehicle 1wherein α is the pitot tube coefficient.
(III) advantageous effects
The design of the device of the invention considers that the air inlet volume of the cooling air duct has no access to the actual working condition during the actual vehicle outfield test and the common air inlet volume test system can not be applied to the outfield condition, therefore, the air inlet grille of the power cabin is re-designed into the testable air inlet grille, the air inlet grille averagely extracts a plurality of grille blades and is replaced into an average air speed and volume test piece, because of the uncertainty of the air flow direction, the dispersion and the randomness phenomenon and the influence caused by the shape change of different blades of different models, in the design process, the air volume calibration flow based on the test bench is carried out to obtain the testable grille characteristic calibration parameter of the specific structural parameter, and the relationship between the measured value of the testable grille and the actual air volume is fitted and corrected on the basis of the calibration parameter, the device can realize the air volume test under the outfield dynamic working condition on the actual air inlet grille. In addition, for the air volume calibration of a power cabin speed field in a laboratory, a two-dimensional laser Doppler velocity measurement technology is adopted, a testable twisted-pair air collecting device is designed above an air inlet grid of the power cabin, and the measurement value of the testable grid at different fan rotating speeds is calibrated and corrected according to the air volume test result of the flow field outside the vehicle power cabin.
Drawings
FIG. 1 is a schematic structural diagram of an air volume testable grille apparatus, wherein a is a schematic structural diagram, and b is a schematic structural diagram of an air velocity and air volume measuring sheet in a;
Fig. 2 is a schematic diagram of an air volume calibration test bed device for calibrating the air volume in the laboratory.
Detailed Description
In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
As shown in figure 1, the invention provides a special vehicle cooling air volume testing device based on a testable grille. Wherein, imbed wind speed air volume and survey the piece, install in the air inlet of real car cooling duct, a plurality of wind speed air volume survey pieces 4 are equidistant to alternate and arrange. Each group of the air quantity measuring device comprises a plurality of air speed and air quantity measuring pieces 4 (which replace a part of original branch grid blades on the air inlet grid and are arranged in an inserting manner with the reserved grid blades), a plurality of total pressure pipes 2, a plurality of static pressure pipes 3 and a micro-pressure difference meter, wherein the air speed and air quantity measuring pieces 4 are the same as the total pressure pipes 2 and the static pressure pipes 3 in quantity and are respectively connected in a one-to-one manner, the dynamic pressure interface of the air speed and air quantity measuring pieces 4 is connected with one end of the total pressure pipes 2, the static pressure interface is connected with one end of the static pressure pipes 3, and the other ends of the total pressure pipes 2 and the static pressure pipes 3 are connected to the.
As shown in fig. 2, the invention further provides a method for testing the cooling air volume of the special vehicle by using the cooling air volume testing device of the special vehicle shown in fig. 1, which comprises the following steps:
Firstly, in actual working conditions of the actual vehicle, the average total pressure p of the air inlet grille is respectively obtained through all the total pressure pipes 2 and all the static pressure pipes 3 0And an average static pressure p, the signal is transmitted to the micro differential pressure gauge 1, thereby obtaining an average dynamic pressure p of the air inlet grille 0-p; using the formula:
Obtaining the average cooling gas flow rate U under the actual working condition of the real vehicle 1Where ρ is the air density,
Then, in the test room, a twisted pair current collector (in a hollow barrel shape) is arranged above an air inlet grille provided with two groups of air volume measuring devices, so that cooling air passes through the top of the twisted pair current collector to flow to the bottom, and a certain number of pitot tubes are arranged in the twisted pair current collector along the direction parallel to the air flow according to an equal area method for measuring the air inlet flow velocity (the flow velocity of one point on the twisted pair current collector is measured by one pitot tube and is in a one-to-one relation), so that an air volume calibration test bench (a radiator assembly, a fan volute and a power assembly device are existing devices in the air volume calibration test bench) is formed. When the pitot tube is not inserted into the flow field, the flow rate of the cooling gas at a certain point on the twisted pair current collector is set as u 0The static pressure is p'. To measure the flow rate at this point on the twisted pair current collector, the orifice a at the top of the pitot tube is aligned with this measurement point and the pitot tube axis is parallel to the flow direction. At this time, the pitot tube is inserted, so that the flow rate at point A is stopped to zero, and the pressure rises from the original static pressure p' to a stop pressure p 0’。p0'includes not only the original static pressure p' of the fluid, but also the portion converted from the kinetic energy of the fluid to the static pressure.
According to the Bernoulli equation for an ideal incompressible fluid, the cooling gas flow rate u measured for another Pitot tube downstream of point A along the parallel gas flow direction can be given by the following relationship:
Therefore, the first and second electrodes are formed on the substrate, 
Therefore, the average cooling gas flow speed u 'measured by all the pitot tubes under the same working condition can be obtained, and the wind speed data collected by the real vehicle can be corrected by comparing the average cooling gas flow speed u' with the wind speed data. Due to the position inconsistency of the total pressure hole and the static pressure hole of the pitot tube, energy loss in the fluid stagnation process and other factors Average flow velocity u' and differential pressure (p) measured by Pitot tube 0p) cannot be completely determined, and correction is performed according to a correction factor α (alpha is a pitot tube coefficient and is calibrated by a test instrument) 1'α U' with U 1Mark aligning U 1', thereby obtaining U under the actual working condition of the real vehicle 1The air flow of the cooling air duct.
The testing device is based on the testability improvement design of the special vehicle air inlet grille, and the testability design is carried out by utilizing the insertion arrangement of the blades of the air inlet grille of the original vehicle, so that the purposes of accuracy and convenience in testing the cooling air volume in the actual vehicle without changing the shape of the original air inlet grille are achieved.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A special vehicle cooling air volume test system based on a testability grating is characterized by comprising a special vehicle cooling air volume test device based on the testability grating, wherein the device comprises an air inlet grating and two groups of air volume measuring devices arranged on the air inlet grating, and the two groups of air volume measuring devices are arranged oppositely; each group of air quantity measuring devices comprises a plurality of air speed and air quantity measuring sheets (4) which are arranged at equal intervals, a plurality of total pressure pipes (2), a plurality of static pressure pipes (3) and a differential pressure gauge, the air speed and air quantity measuring sheets (4) are the same in quantity with the total pressure pipes (2) and the static pressure pipes (3) and are respectively connected in a one-to-one mode, dynamic pressure interfaces of the air speed and air quantity measuring sheets (4) are connected with one end of each total pressure pipe (2), each static pressure interface is connected with one end of each static pressure pipe (3), the other ends of the total pressure pipes (2) and the other ends of the static pressure pipes (3) are connected to the differential pressure gauge, and the air speed and air quantity measuring sheets (4) which are arranged at equal intervals replace one part of original branch grid blades on an air inlet grid and are;
The system also includes a twisted pair collector disposed above the air intake grille with two sets of air volume measuring devices, such that cooling air flows from the top to the bottom of the twisted pair collector through the twisted pair collector, and a number of Pitot tubes disposed in the twisted pair collector along parallel air flow directions according to an equal area method for measuring the air intake flow rate.
2. The system of claim 1, further comprising a heat sink assembly.
3. The system of claim 1, further comprising a fan volute.
4. The system of claim 1, further comprising a powertrain device.
5. A method for testing cooling air volume of a special vehicle by using the system of any one of claims 1 to 4, which is characterized by comprising the following steps:
Firstly, in actual working conditions of the actual vehicle, the average total pressure p of the air inlet grille is respectively obtained through all the total pressure pipes (2) and all the static pressure pipes (3) 0And an average static pressure p, the signal is transmitted to the micro-pressure difference meter (1), so as to obtain the average dynamic pressure p of the air inlet grid 0-p; using the formula:
Obtaining the average cooling gas flow rate U under the actual working condition of the real vehicle 1Wherein ρ is the air density;
The system was then again placed in the laboratory and when the pitot tube was not inserted into the flow field, the cooling gas flow rate at a point on the twisted pair collector was set to u 0The static pressure is p', in order to measure the flow rate at this point on the twisted pair collector, the orifice a at the top of the pitot tube is aligned with this measurement point and the pitot tube axis is parallel to the flow direction, at which point the flow rate at point a is arrested as a result of the insertion of the pitot tube Zero, the pressure rising from the original static pressure p' to the stagnation pressure p 0’，p0'not only contains the original static pressure p' of the fluid, but also contains the part converted from the kinetic energy of the fluid into the static pressure;
For another pitot tube measured cooling gas flow rate u downstream of point a in the parallel gas flow direction, the following relationship is set forth:
Therefore, the first and second electrodes are formed on the substrate, 
Therefore, the average cooling gas flow speed u 'measured by all the pitot tubes under the same working condition can be obtained, and the wind speed data collected by the real vehicle can be corrected by comparing the average cooling gas flow speed u' with the wind speed data.
6. the method as claimed in claim 5, wherein the step of comparing and correcting the wind speed data collected by the real vehicle is to correct the wind speed data according to a correction factor α to obtain a corrected flow velocity formula of U 1'α U' with U 1Mark aligning U 1', thereby obtaining U under the actual working condition of the real vehicle 1wherein α is the pitot tube coefficient.
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 |
Applications Claiming Priority (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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109238738A CN109238738A (en) | 2019-01-18 |
| CN109238738B true CN109238738B (en) | 2020-07-17 |
Family
ID=65070533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810932252.6A Active CN109238738B (en) | 2018-08-16 | 2018-08-16 | Special vehicle cooling air volume testing device and method based on testability grating |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109238738B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101000358A (en) * | 2006-01-09 | 2007-07-18 | 周丽琴 | Instrument for measuring mean flow rate of pipe gas |
| CN201828290U (en) * | 2010-10-29 | 2011-05-11 | 上海德尔福汽车空调系统有限公司 | Multifunctional blast volume test bed |
| CN203414118U (en) * | 2013-07-12 | 2014-01-29 | 皇家空调设备工程(广东)有限公司 | Integrated staggered type variable-air volume air speed sensor |
| CN204594508U (en) * | 2015-04-10 | 2015-08-26 | 上海东富龙德惠空调设备有限公司 | The online air quantity detector of average formula |
| CN205192721U (en) * | 2015-10-20 | 2016-04-27 | 上海恺杰汽车塑料零部件有限公司 | Automotive interior air outlet performance integrated test device that bloies |
| CN106931599A (en) * | 2017-03-17 | 2017-07-07 | 中国船舶重工集团公司第七〇四研究所 | Vav terminal apparatus for measuring air quantity peculiar to vessel and scaling method |
| CN206583489U (en) * | 2017-03-22 | 2017-10-24 | 巴科尔环境系统（佛山）有限公司 | Air quantity collector |
| CN206975067U (en) * | 2017-08-10 | 2018-02-06 | 黑龙江科技大学 | A kind of minute-pressure differential wind velocity measurement system |
-
2018
- 2018-08-16 CN CN201810932252.6A patent/CN109238738B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101000358A (en) * | 2006-01-09 | 2007-07-18 | 周丽琴 | Instrument for measuring mean flow rate of pipe gas |
| CN201828290U (en) * | 2010-10-29 | 2011-05-11 | 上海德尔福汽车空调系统有限公司 | Multifunctional blast volume test bed |
| CN203414118U (en) * | 2013-07-12 | 2014-01-29 | 皇家空调设备工程(广东)有限公司 | Integrated staggered type variable-air volume air speed sensor |
| CN204594508U (en) * | 2015-04-10 | 2015-08-26 | 上海东富龙德惠空调设备有限公司 | The online air quantity detector of average formula |
| CN205192721U (en) * | 2015-10-20 | 2016-04-27 | 上海恺杰汽车塑料零部件有限公司 | Automotive interior air outlet performance integrated test device that bloies |
| CN106931599A (en) * | 2017-03-17 | 2017-07-07 | 中国船舶重工集团公司第七〇四研究所 | Vav terminal apparatus for measuring air quantity peculiar to vessel and scaling method |
| CN206583489U (en) * | 2017-03-22 | 2017-10-24 | 巴科尔环境系统（佛山）有限公司 | Air quantity collector |
| CN206975067U (en) * | 2017-08-10 | 2018-02-06 | 黑龙江科技大学 | A kind of minute-pressure differential wind velocity measurement system |
Non-Patent Citations (1)
| Title |
|---|
| 风管流量测量实验的设计;方武;《安徽建筑工业学院学报(自然科学版)》;20081215;第16卷(第06期);第65-67页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109238738A (en) | 2019-01-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Marusic et al. | Experimental study of wall boundary conditions for large-eddy simulation | |
| CN104048808B (en) | A kind of kolmogorov sinai entropy probe | |
| CN109238738B (en) | Special vehicle cooling air volume testing device and method based on testability grating | |
| CN101526419A (en) | Flow characteristics test method and device of a plate-fin heat exchanger fin | |
| CN208534819U (en) | Device for the test of fan aeroperformance | |
| Kline et al. | Preliminary experimental investigation of effect of free-stream turbulence on turbulent boundary-layer growth | |
| Khot et al. | An overview of radiator performance evaluation and testing | |
| Agrawal et al. | Minimizing recalibration using a non-linear regression technique for thermal anemometry | |
| CN108490219A (en) | A kind of apparatus and method for the equipment flow relocity calculation that tests the speed for correction matrix | |
| CN106126858A (en) | A kind of method of fan type selecting in electrokinetic cell air cooling system | |
| CN102680037B (en) | Air quantity differential pressure calibration method applied to liquid cooling type frame | |
| Delhaye et al. | Enhanced performance of fast-response 3-hole wedge probes for transonic flows in axial turbomachinery | |
| CN210741871U (en) | Cooler simulation test platform | |
| Nader et al. | Characterization of low turbulence wind tunnel | |
| RU86751U1 (en) | MEASURING AERODYNAMIC INSTALLATION | |
| Town et al. | Total pressure correction of a sub-miniature five-hole probe in areas of pressure gradients | |
| Miheev et al. | Hot-wire measurements with automatic compensation of ambient temperature changes | |
| Shinder et al. | NIST’s new 3D airspeed calibration rig, addresses turbulent flow measurement challenges | |
| CN208026664U (en) | A kind of finned tube testing device for heat transferring performance based on Real-Time Atmospheric humidity and pressure | |
| Kuthada | A review of some cooling air flow measurement techniques for model scale, full scale and cfd | |
| CN111141522A (en) | Full-parameter probe for measuring high subsonic three-dimensional steady flow field | |
| CN111537135B (en) | Dynamic pressure field test method based on wall heat exchange characteristics | |
| Federspiel | Using the torque characteristics of dampers to measure airflow, Part II: analysis and testing | |
| Di Cristina et al. | Comparison of Flow Measurement Devices for Large Fire Experiments | |
| CN115839817B (en) | Near-wall multipoint type boundary layer measuring device and method for airfoil test |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |