CN114526932B - Water spraying test system and method for simulating water splashing of vehicle wheel in rain - Google Patents
Water spraying test system and method for simulating water splashing of vehicle wheel in rain Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 210
- 238000005507 spraying Methods 0.000 title claims abstract description 37
- 238000012360 testing method Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000007921 spray Substances 0.000 claims abstract description 33
- 238000004088 simulation Methods 0.000 claims abstract description 16
- 239000002002 slurry Substances 0.000 claims abstract description 9
- 238000010998 test method Methods 0.000 claims abstract description 8
- 238000002156 mixing Methods 0.000 claims description 39
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- 238000003860 storage Methods 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 238000011161 development Methods 0.000 claims description 4
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- 239000006185 dispersion Substances 0.000 claims description 2
- 239000007850 fluorescent dye Substances 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims 2
- 239000003795 chemical substances by application Substances 0.000 abstract description 7
- 238000003756 stirring Methods 0.000 abstract description 7
- 239000007788 liquid Substances 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract 1
- 230000007613 environmental effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 238000013329 compounding Methods 0.000 description 2
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- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000009533 lab test Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- 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 invention provides a water spray test system and a water spray test method for simulating water splashing of a driving wheel in rain, wherein a vehicle to be tested runs on a hub of a whole vehicle running chassis dynamometer according to a set speed; a water supply device is arranged to provide a water source with controllable pressure and adjustable flow; arranging a feeding device to uniformly stir the fluorescent agent or the slurry and mix the fluorescent agent or the slurry with a water source of a water supply device; the uniform and stable rainwater splashing simulation is realized through the flat nozzle; the wind supply device provides a certain amount of stable wind for testing so as to simulate the movement situation of rainwater splashing to be close to the relative movement situation on a real road. The system and the method for simulating the water spraying test of the vehicle wheel splash in the rain provided by the invention realize the simulation of the proper water spraying state of the wheel splash rainwater in the wind tunnel of the automobile environment, thereby effectively completing the rainwater splash simulation test and providing preparation for the later observation of the influence of the liquid splashed to the rearview mirror and the like on the driver, the influence of the liquid splashed to the automobile body on the automobile body and the like.
Description
Technical Field
The invention belongs to the technical field of automobile environment laboratory tests, and particularly relates to a water spray test system and method for simulating water splashing of a vehicle wheel in rain.
Background
With the development of automobile technology, the influence of various atmospheric environmental factors (such as temperature, humidity, pressure, wind, rain, snow, cloud, fog, ice, frost, lightning, thunder, hail, haze, light, ground radiation and the like) on the use (including operation, parking, maintenance and the like) and the performance (including safety, reliability, service life and the like) of vehicles gradually arouses the attention of people. In order to research the environmental adaptability of vehicles, people establish vehicle environmental laboratories, including environmental wind tunnels, high and low temperature environmental cabins, rain laboratories, wind and rain coupling laboratories, icing and frosting laboratories, defrosting and demisting laboratories, salt fog corrosion laboratories, sunlight simulation laboratories, wind and sand simulation laboratories, plateau environmental simulation laboratories, natural disaster laboratories and the like. In order to simulate the environmental conditions of the nature in a laboratory, it is necessary to have a suitable environmental condition simulation system, such as a wind system, a rain system, a snow system, a heating and warming system, a cooling and cooling system, a sunlight simulation system, a wind and sand simulation system, an air pressure control system, and the like. The rain system is used for simulating a rain environment in nature.
In terms of rainwater simulated spraying, various spraying systems have been developed: patent CN 110044805 a discloses a rain test box technology, the spraying system of the rain test box is composed of a filter plate, spraying components (including spraying heads distributed in a matrix), a leakage plate, a water inlet and the like; patent CN 106092452B discloses a testing device for rain-proof performance of tent, which comprises a group of simulated rainwater spray devices, wherein the simulated rainwater spray devices comprise four positioning frames, a spray frame, 25 uniformly distributed spray heads connected with a flow regulator, a lifting electric hoist and the like; patent CN 106546840B discloses a simulated rainwater spraying system for transmission equipment electrical test, which comprises a water supply device, a spraying device, an angle adjusting mechanism and the like, wherein the spraying device comprises a supporting mechanism, a main water pipe, a water dividing pipe and a spraying head. However, these rainwater simulation spraying systems cannot simulate the influence of wind and rain on the running vehicle, and further cannot simulate the pollution condition of the running vehicle caused by rainwater splashed by the running vehicle.
The corresponding water spraying device is also needed for simulating the wheel splash rain in the environmental wind tunnel. The existing rainwater simulation spraying system is unreasonable in design, can not form an even ideal water film capable of simulating rainwater accumulation, is not clear of the exact position and the water spraying amount of water spraying, can not truly simulate the condition of rainwater splashing of wheels, and can not effectively complete a rainwater splashing simulation test.
Disclosure of Invention
In view of the above, the present invention provides a water spraying test system and method for simulating water splashing of a vehicle wheel in rain, so as to solve the problem that the existing rainwater simulation spraying system cannot simulate the influence of wind and rain on a running vehicle, and further cannot simulate the influence of rainwater splashing from the running vehicle on the self-pollution condition of the vehicle.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
on one hand, the application provides a water spray test system for simulating water splashing of a vehicle wheel of a running vehicle in rain, which comprises a water supply device, a feeding device, a spraying device, an air supply device and a whole vehicle running chassis dynamometer, wherein the water outlet end of the water supply device is mixed with the discharge end of the feeding device through a mixing valve;
the injection device comprises a mixing pipeline, a main pipeline, branch pipelines, an opening degree adjusting valve and a flat nozzle, wherein one end of the mixing pipeline is connected with the outlet end of the mixing valve, the other end of the mixing pipeline is connected with the main pipeline, the main pipeline is also provided with a plurality of branch pipelines, the opening degree adjusting valve is arranged in the middle of each branch pipeline, and the flat nozzle is arranged at one end of each branch pipeline, which is far away from the main pipeline; the water spraying end of each flat nozzle is provided with a flat opening part, and the flat opening part of each flat nozzle is arranged corresponding to one hub;
the wind supply device applies wind with set wind speed to the right front of the vehicle to be tested, and the vehicle to be tested runs on a rotating hub of the whole vehicle running chassis dynamometer according to the set speed.
Furthermore, the water supply device comprises a first tap water inlet pipeline, a first water storage tank, a first water outlet pipeline and a water pressure regulating valve, wherein one end of the first tap water inlet pipeline is connected with tap water, the other end of the first tap water inlet pipeline is communicated with an inlet of the water storage tank, an outlet of the water storage tank is connected with an inlet of the mixing valve through the first water outlet pipeline, and a water pump and the water pressure regulating valve are further arranged in the middle of the first water outlet pipeline;
the feeding device comprises a tap water inlet pipeline II, a mixing tank and a discharge pipeline I, wherein one end of the tap water inlet pipeline II is connected with tap water, the other end of the tap water inlet pipeline II is connected with an inlet of the mixing tank, an outlet of the mixing tank is connected with an inlet of a mixing valve through the discharge pipeline I, and substances in the mixing tank comprise slurry and fluorescent agent for development observation;
still be connected with water drainage pipeline on the main line, water drainage pipeline keeps away from the one end of main line and is connected with the running water, all be provided with the electric switch valve on hybrid line and the water drainage pipeline.
Furthermore, a plurality of rows of water flow dispersing structures intersecting with the water flow direction are arranged in the middle of the flat nozzle, and each water flow dispersing structure comprises a plurality of guide columns arranged at equal intervals;
in the two adjacent rows of the guide columns, the guide columns in one row correspond to the guide columns in the other row in a clearance manner.
Furthermore, the water flow dispersing structures are arranged in 2-4 rows, and the shape of each row of water flow dispersing structures comprises a pointed shape, a parabolic shape and a circular arc shape.
Furthermore, a water flow overflow structure is arranged between the flat opening part of the flat nozzle and the water flow dispersion structure, and the water flow overflow structure is a groove lower than the lower bottom surface of the flat opening part;
the maximum depth of the water flow overflow structure is that the distance from the bottom surface of the shell body to the rotating hub under the water flow overflow structure is larger than the minimum distance e from the flat opening part to the rotating hub,
the minimum distance e is in a value range: the maximum amplitude of the rotating hub is more than or equal to e and less than 50mm, and the maximum amplitude of the rotating hub is more than or equal to e and less than or equal to 45 mm.
Furthermore, the water flow overflow structure is arc-shaped, and the upper top surface of the water flow overflow structure is tangent to the lower bottom surface of the flat opening part;
the flat opening part is a flat rectangular cylinder, and a plurality of vertical ribs are arranged in the flat opening part at equal intervals along the water flow direction; the width of the flat opening part corresponds to the width of a wheel, and the height of the interior of the flat opening part is 1 mm-2 mm.
On the other hand, the application provides a water spray test method for simulating water splashing of the driving wheel in the rain based on the water spray test system for simulating water splashing of the driving wheel in the rain, which is used for establishing an air supply environment for a vehicle to be tested, enabling the flat nozzle to correspond to the set position of the hub, enabling the flat nozzle to be separated from the hub by the set distance, and spraying the set water spray quantity to the hub.
Further, a wind supply environment is established for the vehicle to be tested, and the specific method comprises the following steps: the air supply direction is the direction of supplying air to the front of the vehicle, and the air supply speed range is 1/2-2/3.
Furthermore, the flat nozzle is set at a position corresponding to the hub, and the specific method comprises the following steps:
the flat opening part of the flat nozzle is horizontally arranged, and the distance between the lower plane of the flat opening part of the flat nozzle and the tangent plane passing through the vertex of the rotating hub is 2-2.5 mm;
the method for setting the distance between the flat nozzle and the hub comprises the following steps:
and (3) enabling the plane of the front end of the flat nozzle and a parallel line of the central line of the rotating hub passing through the vertex of the rotating hub to be separated by a distance | CD |, wherein the calculation method of | CD |:
wherein,
r is the radius of the rotating hub, mm;
h is the vertical distance, mm, from the lower bottom surface of the plane at the front end of the flat nozzle to the tangent line of the vertex of the rotating hub;
e is the minimum distance, mm, of the flat-jet nozzle from the hub.
The calculation formula of the water spraying amount is as follows:
Q w =(W w +60)*H w *v/60，
wherein,
W w is the width of the wheel, mm;
(W w +60) is the width of the flat opening, mm;
v is the speed of the vehicle, km/h;
H w is the thickness of the water film, mm,
when the temperature is higher than the set temperature
，
，
When in use
，
。
Compared with the prior art, the water spray test system and method for simulating water splashing of the vehicle wheel in the rain have the following beneficial effects:
(1) according to the water spraying test system for simulating the water splashing of the vehicle wheel in the rain, the water supply device provides a water source with controllable pressure and adjustable flow; the feeding device is used for uniformly stirring the fluorescent agent or the slurry and mixing the fluorescent agent or the slurry with the water supply device, so that the observation of a later test is facilitated; through the setting that flat mouthful nozzle corresponds vehicle wheel hub, realize even stable simulation rainwater splash, guarantee later stage test data controllability.
(2) According to the water spray test system for simulating water splashing of the vehicle wheel of the traveling crane in the rain, the water flow is dispersed along the vertical direction of the water flow by the water flow dispersing structure of each row, and the water flow is uniformly distributed on the nozzle surface in a separated manner and flows out uniformly; the flow speed is controlled, when water flows out from the water spraying end, the speed is as low as possible, splashing cannot be generated due to the fact that water impacts the rotating hub, factors for confusing the splashing caused by the wheel are generated, and judgment that the influence of the splashing caused by the detected wheel on vehicle running is affected is influenced; the upper top surface of the water flow overflow structure is tangent to the lower bottom surface of the flat nozzle, so that smooth flow guiding water flow can enter the flat nozzle.
(3) The water spraying test method for simulating water splashing of the wheels of the traveling crane in rain can simulate any water splashing amount, can uniformly distribute the thickness, the shape and the spraying position of a water film, can control an ideal water film formed by uniformly accumulating rainwater, can reflect the relation between the water splashing amount and the vehicle speed, can simulate the influence effect of relative air flow on the water splashing of the traveling crane, and can simulate the proper water spraying state of the wheel splashing rainwater in an automobile environment wind tunnel, thereby effectively completing the rainwater splashing simulation test.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a water spray test system for simulating water splashing of a vehicle wheel in rain according to an embodiment of the invention;
FIG. 2 is a schematic view of the internal structure of a flat nozzle according to an embodiment of the present invention;
FIG. 3 is a schematic view of a flat nozzle according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a top view effect of a small flow spray according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a side view effect of a small flow spray according to an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating a top view of a medium flow spray according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a side view effect of a medium flow spray according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a top-view effect of the high-flow spray system according to the embodiment of the present invention;
fig. 9 is a schematic diagram of a side view effect of the high flow rate spray according to the embodiment of the present invention.
Description of reference numerals:
1-a water supply device; 11-a water inlet pipeline I; 12-a water storage tank; 13-a first water outlet pipeline; 14-a water pressure regulating valve; 15-a water pump; 2-a feeding device; 21-water inlet pipeline II; 22-mixing tank; 23-a first discharge pipeline; 24-a mixing valve; 3-a spraying device; 31-a mixing conduit; 32-main pipe; 33-a drain line; 34-branch lines; 341-opening degree regulating valve; 35-an electric switch valve; 4-an air supply device; 5-flat nozzle; 51-a flat opening; 511-stud; 52-water flow dispersing structure; 521-a flow guide column; 53-water flow overflow configuration; 6-hub.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, on one hand, the application provides a water spray test system for simulating water splashing of a vehicle wheel in a rainy day, which comprises a water supply device 1, a feeding device 2, a spraying device 3, an air supply device 4 and a whole vehicle running chassis dynamometer, wherein a water outlet end of the water supply device 1 is mixed with a discharge end of the feeding device 2 through a mixing valve 24;
the injection device 3 comprises a mixing pipeline 31, a main pipeline 32, branch pipelines 34, an opening degree regulating valve 341 and a flat nozzle 5, wherein one end of the mixing pipeline 31 is connected with the outlet end of the mixing valve 24, the other end of the mixing pipeline 31 is connected with the main pipeline 32, the main pipeline 32 is also provided with a plurality of branch pipelines 34, the opening degree regulating valve 341 is arranged in the middle of each branch pipeline 34, and one end of each branch pipeline 34, which is far away from the main pipeline 32, is provided with the flat nozzle 5; the water discharge end of the flat nozzle 5 is provided with flat opening parts 51, and the flat opening part 51 of each flat nozzle 5 is arranged corresponding to one hub 6;
the air supply device 4 applies wind with set wind speed to the right front of the vehicle to be tested, and the vehicle to be tested runs on a rotating hub of the whole vehicle running chassis dynamometer according to the set speed.
The air supply device 4 is an automobile environment wind tunnel.
As shown in fig. 1, the water supply device 1 includes a first tap water inlet pipe 11, a water storage tank 12, a first water outlet pipe 13, and a water pressure regulating valve 14, wherein one end of the first tap water inlet pipe 11 is connected to tap water, the other end is communicated with an inlet of the water storage tank 12, an outlet of the water storage tank 12 is connected with an inlet of a mixing valve 24 through the first water outlet pipe 13, and a water pump 15 and the water pressure regulating valve 14 are further arranged in the middle of the first water outlet pipe 13;
the feeding device 2 comprises a tap water inlet pipeline II 21, a mixing tank 22 and a discharge pipeline I23, one end of the tap water inlet pipeline II 21 is connected with tap water, the other end of the tap water inlet pipeline II is connected with an inlet of the mixing tank 22, an outlet of the mixing tank 22 is connected with an inlet of a mixing valve 24 through the discharge pipeline I23, and substances in the mixing tank 22 comprise slurry and fluorescent agents for development observation;
still be connected with drain line 33 on the main line 32, the one end that main line 32 was kept away from to drain line 33 is connected with the running water, all be provided with electric switch valve 35 on hybrid piping 31 and the drain line 33.
The drainage pipeline is used for draining away surplus water which is not sprayed out in the pipeline.
The mixing valve, the opening regulating valve, the water pump and the water pressure regulating valve of the water supply device, the electric switch valves on the mixing pipeline and the drainage pipeline can be opened and closed manually, and can also be opened and closed by the existing PLC control technology.
Be provided with the stirring rod in compounding jar 22, the stirring rod can also carry out manual stirring through the material in the gear motor control stirring compounding jar.
As shown in fig. 2 to 9, a plurality of rows of water flow dispersing structures 52 intersecting with the water flow direction are arranged in the middle of the flat nozzle 5, and the water flow dispersing structures 52 comprise a plurality of guide columns 521 arranged at equal intervals; in two adjacent rows of the guide columns 521, the guide columns 521 in one row correspond to the guide columns 521 in the other row with a gap therebetween.
As shown in fig. 2 to 9, the water flow dispersing structures 52 are arranged in 2 to 4 rows, and the shape of each row of water flow dispersing structures 52 includes a pointed shape, a parabolic shape, and a circular arc shape.
As shown in fig. 2, the water current spreading structure is raised toward the water inlet side.
In a horizontal plane, each row of the water flow dispersing structures 52 enable water flow to be dispersed along the vertical direction of the water flow, so that the water flow is uniformly distributed on the nozzle face in a dividing way and flows out uniformly; also control the velocity of flow simultaneously, when rivers were followed the water spray end and are flowed, speed is as little as possible, can not produce because of water striking changes the hub and splashes, if produce and splash, then just confuse the splashing that the wheel arouses easily, influence this splash that detects the wheel and arouse for the vehicle go bring the influence for the vehicle for example, detect to splash to probably bring on the rear-view mirror to drive experience influence and even cause the judgement of the condition of driving danger.
As shown in fig. 2 to 9, a water flow overflow structure 53 is arranged between the flat opening 51 of the flat nozzle 5 and the water flow dispersing structure 52, and the water flow overflow structure 53 is a groove lower than the lower bottom surface of the flat opening 51;
the maximum depth of the water flow overflow structure 53 is that the distance from the bottom surface of the shell body of the water flow overflow structure 53 to the rotary hub is larger than the minimum distance e from the flat opening part 51 to the rotary hub,
the minimum distance e is in a value range: the maximum amplitude of the rotary hub is more than or equal to e and less than or equal to 5mm and more than or equal to e and less than 50mm, and the maximum amplitude of the rotary hub is more than or equal to 45 mm.
As shown in fig. 2 to 9, the water flow overflow structure 53 is arc-shaped, and an upper top surface of the water flow overflow structure 53 is tangent to a lower bottom surface of the flat opening 51;
the flat opening part 51 is a flat rectangular cylinder, and a plurality of studs 511 are arranged in the flat opening part 51 at equal intervals along the water flow direction; the width of the flat opening 51 corresponds to the width of the wheel, and the internal height of the flat opening 51 is 2 mm.
The upper top surface of the water flow overflow structure 53 is tangent to the lower bottom surface of the flat nozzle 5, so that smooth flow guide water flow can enter the flat nozzle 5;
the flat opening 51 is a flat rectangular opening having an internal height of 2mm and a width of 320 mm.
As shown in fig. 2 and 4, according to the water spray test system for simulating water splashing of a wheel of a vehicle in rain, the present application provides a water spray test method for simulating water splashing of a wheel of a vehicle in rain, which establishes an air supply environment for a vehicle to be tested, sets a position of the flat nozzle 5 corresponding to the hub 6, and sprays the hub 6 with a set amount of water spray by spacing the flat nozzle 5 from the hub 6 by a set distance.
And simulating a water spraying test environment for water splashing of the vehicle wheels in the rain.
The method for establishing the air supply environment for the vehicle to be tested comprises the following specific steps: the wind supply direction is the direction of supplying wind to the front of the vehicle, the wind supply speed is the vehicle speed in the range of one third to two thirds, and the optimal value is 1/2 vehicle speed.
As shown in fig. 2 and 4, the flat nozzle 5 is set to correspond to the hub 6 by the following specific method:
the flat opening part 51 of the flat nozzle 5 is horizontally arranged, and the distance between the lower plane of the flat opening part of the flat nozzle and the tangent plane passing through the vertex of the rotating hub is 2-2.5 mm;
the flat nozzle 5 and the hub 6 are separated by a set distance, and the specific method comprises the following steps:
and (3) separating the plane of the front end of the flat nozzle 5 from a parallel line of the central line of the rotating hub passing through the vertex of the rotating hub by a distance | CD |, wherein the calculation method of | CD |:
wherein,
r is the radius of the rotating hub, mm;
h is the vertical distance, mm, from the lower bottom surface of the plane at the front end of the flat nozzle 5 to the tangent line of the top point of the rotating hub;
e is the minimum distance, mm, of the flat-mouth nozzle 5 from the hub.
The calculation formula of the water spraying amount is as follows:
Q w =(W w +60)*H w *v/60，
wherein,
W w is the width of the wheel, mm;
(W w +60) is the width of the flat opening, mm;
v is the speed of the vehicle, km/h;
H w is the thickness of the water film, mm,
when in use
，
，
When in use
，
。
H w The thickness of the water film is generally 0.2 mm-2 mm.
According to the embodiment water injection calculation formula, the optimum given water injection is shown in the following table:
the working process is as follows:
as shown in fig. 1 to 9, a vehicle to be tested runs on a rotating hub of a whole vehicle running chassis dynamometer according to a set vehicle speed; the water supply device 1 provides a water source with controllable pressure and adjustable flow, and the source of the water source can be directly connected with a tap water source; the feeding device 2 completes the uniform stirring of the fluorescent agent or the slurry and mixes the fluorescent agent or the slurry to the water supply device 1; the flat nozzle 5 is used for constructing the injection device 3, so that the rainwater splashing can be simulated uniformly and stably; the air supply device 4 provides a certain amount of stable wind for testing, so that the movement condition of the splashed rainwater is simulated to be close to the relative movement condition on a real road, and preparation is made for later detection of the influence of the liquid splashed to the rearview mirrors and the like on drivers.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The utility model provides a water spray test system of driving wheel splash in simulation rain which characterized in that: the device comprises a water supply device (1), a feeding device (2), an injection device (3), an air supply device (4) and a whole vehicle running chassis dynamometer, wherein the water outlet end of the water supply device (1) is mixed with the discharge end of the feeding device (2) through a mixing valve (24);
the injection device (3) comprises a mixing pipeline (31), a main pipeline (32), a flat nozzle (5) and an opening degree adjusting valve (341), one end of the mixing pipeline (31) is connected with the outlet end of the mixing valve (24), the other end of the mixing pipeline (31) is connected with the main pipeline (32), the main pipeline (32) is also provided with a plurality of branch pipelines (34), the opening degree adjusting valve (341) is arranged in the middle of each branch pipeline (34), and the flat nozzle (5) is arranged at one end, far away from the main pipeline (32), of each branch pipeline (34); the water spraying end of the flat nozzle (5) is provided with a flat opening part (51), and the flat opening part (51) of each flat nozzle (5) is arranged corresponding to one hub (6);
the air supply device (4) applies wind with set wind speed to the right front of the vehicle to be tested, and the vehicle to be tested runs on a rotating hub of the whole vehicle running chassis dynamometer according to the set speed;
a plurality of rows of water flow dispersing structures (52) intersecting with the water flow direction are arranged in the middle of the flat nozzle (5), and each water flow dispersing structure (52) comprises a plurality of guide columns (521) arranged at equal intervals;
in the guide columns (521) in two adjacent rows, the guide columns (521) in one row correspond to the guide columns (521) in the other row in a clearance manner.
2. The system of claim 1, wherein the system is configured to simulate water splashing on a wheel of a vehicle in the rain: the water supply device (1) comprises a tap water inlet pipeline I (11), a water storage tank (12), a water outlet pipeline I (13) and a water pressure regulating valve (14), one end of the tap water inlet pipeline I (11) is connected with tap water, the other end of the tap water inlet pipeline I is communicated with an inlet of the water storage tank (12), an outlet of the water storage tank (12) is connected with an inlet of a mixing valve (24) through the water outlet pipeline I (13), and a water pump (15) and the water pressure regulating valve (14) are further arranged in the middle of the water outlet pipeline I (13);
the feeding device (2) comprises a tap water inlet pipeline II (21), a mixing tank (22) and a discharging pipeline I (23), one end of the tap water inlet pipeline II (21) is connected with tap water, the other end of the tap water inlet pipeline II is connected with an inlet of the mixing tank (22), an outlet of the mixing tank (22) is connected with an inlet of a mixing valve (24) through the discharging pipeline I (23), and substances in the mixing tank (22) comprise slurry and fluorescent agents for development observation;
still be connected with drain line (33) on main pipeline (32), the one end that main pipeline (32) were kept away from in drain line (33) is connected with the running water, all be provided with electric switch valve (35) on hybrid line (31) and drain line (33).
3. The system of claim 1, wherein the system is configured to simulate water splashing on a wheel of a vehicle in the rain: the water flow dispersing structures (52) are arranged in 2-4 rows, and the shape of each row of water flow dispersing structures (52) comprises a pointed shape, a parabolic shape and a circular arc shape.
4. A water spray test system for simulating water splash at a vehicle wheel in rain as claimed in claim 3, wherein: a water flow overflow structure (53) is arranged between the flat opening part (51) of the flat nozzle (5) and the water flow dispersion structure (52), and the water flow overflow structure (53) is a groove lower than the lower bottom surface of the flat opening part (51);
the maximum depth of the water flow overflow structure (53) is that the distance from the bottom surface of the shell body of the lower shell of the water flow overflow structure (53) to the rotary hub is larger than the minimum distance e between the flat opening part (51) and the rotary hub,
the minimum distance e is in a value range: the maximum amplitude of the rotating hub is more than or equal to e and less than 50mm, and the maximum amplitude of the rotating hub is more than or equal to e and less than or equal to 45 mm.
5. The system of claim 4, wherein the system is configured to simulate water splashing on a wheel of a vehicle in the rain: the water flow overflow structure (53) is arc-shaped, and the upper top surface of the water flow overflow structure (53) is tangent to the lower bottom surface of the flat opening part (51);
the flat opening part (51) is a flat rectangular cylinder, and a plurality of studs (511) are arranged in the flat opening part (51) at equal intervals along the water flow direction; the width of the flat opening part (51) corresponds to the width of a wheel, and the internal height of the flat opening part (51) is 1-2 mm.
6. A water spray test method for simulating water splash of a vehicle wheel in rain based on the water spray test system for simulating water splash of a vehicle wheel in rain according to any one of claims 1 to 5, characterized in that: an air supply environment is established for the vehicle to be tested, the flat nozzle (5) is set at a position corresponding to the hub (6), the flat nozzle (5) and the hub (6) are separated by a set distance, and water spraying of a set water spraying amount is carried out on the hub (6).
7. The water spray test method for simulating water splashing of a vehicle wheel in rain as claimed in claim 6, wherein: the method for establishing the air supply environment for the vehicle to be tested comprises the following specific steps: the air supply direction is the direction of supplying air to the right front of the vehicle, and the range of the air supply speed is one third to two thirds of the vehicle speed.
8. The water spray test method for simulating water splashing of a vehicle wheel in rain as claimed in claim 6, wherein:
the flat nozzle (5) is set at a position corresponding to the hub (6), and the specific method comprises the following steps:
the flat opening part (51) of the flat nozzle (5) is horizontally arranged, and the distance between the lower plane of the flat opening part (51) of the flat nozzle (5) and the tangent plane passing through the vertex of the rotating hub is 2-2.5 mm;
the method for setting the distance between the flat nozzle (5) and the hub (6) comprises the following steps:
the distance | CD | is formed by separating the plane of the front end of the flat nozzle (5) from the parallel line of the central line of the rotating hub passing through the vertex of the rotating hub, and the calculation method of the | CD | comprises the following steps:
wherein,
r is the radius of the rotating hub, mm;
h is the vertical distance, mm, from the tangent line of the vertex of the rotating hub to the lower bottom surface of the plane at the front end of the flat nozzle (5);
e is the minimum distance, mm, of the flat nozzle (5) from the rotating hub.
9. The water spray test method for simulating water splashing of a vehicle wheel in rain as claimed in claim 6, wherein: the calculation formula of the water spraying amount is as follows:
Q w ＝(W w +60)*H w *v/60，
wherein,
W w is the width of the wheel, mm;
(W w +60) is the width of the flat opening, mm;
v is the speed of the vehicle, km/h;
H w is the thickness of the water film, mm,
when v is more than or equal to 10km/H and less than or equal to 70km/H, H w ＝(120-v)/50，
When the v is more than 70km/H when the m/H is more than or equal to 126km/H, H w ＝(132.5-v)/62.5。
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| CN115628920B (en) * | 2022-12-21 | 2023-03-14 | 中汽研（天津）汽车工程研究院有限公司 | Method and device for simulating and testing influence of winding rainwater of front tire on performance of rear vehicle |
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