CN109556824A - A kind of PIV experiment device for flute surfaces air drag reduction - Google Patents

A kind of PIV experiment device for flute surfaces air drag reduction Download PDF

Info

Publication number
CN109556824A
CN109556824A CN201811538191.1A CN201811538191A CN109556824A CN 109556824 A CN109556824 A CN 109556824A CN 201811538191 A CN201811538191 A CN 201811538191A CN 109556824 A CN109556824 A CN 109556824A
Authority
CN
China
Prior art keywords
channel
flute
piv
drag reduction
ccd camera
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.)
Pending
Application number
CN201811538191.1A
Other languages
Chinese (zh)
Inventor
刘赵淼
田琦
逄燕
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing University of Technology
Original Assignee
Beijing University of Technology
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Beijing University of Technology filed Critical Beijing University of Technology
Priority to CN201811538191.1A priority Critical patent/CN109556824A/en
Publication of CN109556824A publication Critical patent/CN109556824A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M10/00Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels

Abstract

The invention discloses a kind of PIV experiment devices for flute surfaces air drag reduction, belong to experimental fluid mechanics research field.The experimental system includes power device, pressure test device and PIV system three parts.Power device is mainly made of blower;Pressure test device is mainly made of TCH test channel, frequency modulator, anemobiagraph and differential manometer;PIV system is mainly made of CCD camera, laser and computer.The device may be implemented to measure it is different in flow rate under, the pressure drop of different flute surfaces judges whether drag reduction;The requirement with its interior flow field characteristic of PIV systematic observation may be implemented simultaneously.The drag reduction mechanism that non-smooth surface can be probed into according to its interior flow field characteristic, provides theoretical direction for groove structure optimization design, reduces cost, increases fuel utilization ratio and reduce energy consumption playing an important role to aircraft.

Description

A kind of PIV experiment device for flute surfaces air drag reduction
Technical field
Particle image velocimetry (the Particle Image that the present invention relates to a kind of for flute surfaces air drag reduction Velocimetry, abbreviation PIV) experimental provision, more particularly to fluid in hydrodynamics when flowing through different grooves, groove ruler The influence of the factors stream fields such as very little, groove direction, fluid velocity simultaneously combines boundary layer theory analysis flow field structure, belongs to using real Experiment device measures the technical field in flute surfaces air drag reduction and flow field.
Background technique
In recent years, social energy consumption constantly rises, and causes the great attention in the whole world, energy-saving to have become both at home and abroad Important research topic.The energy consumption of the vehicles such as aircraft, train, ship is mainly derived from skin resistance, reduces surface Resistance has important directive significance to reduction energy consumption, raising energy utilization rate.
Bionic non-smooth surface drag reduction technology has a wide range of applications as the new method for reducing aircraft surfaces air drag Prospect changes Turbulent Kinetic and achievees the effect that drag reduction mainly by control turbulence structure, has that energy loss is low, structure is simple Single, Yi Shixian, is mainly used in the field of traffic such as aircraft, automobile at the advantages of being not required to any additional-energy.Drag reduction by grooved surface pair Mobility status of the aerofoil surface under high-speed flow state is affected, and research drag reduction by grooved surface is for improving using energy source Rate, attenuating oil consumption, increase voyage are significant.
Numerical simulation study mainly is concentrated on for the research of drag reduction by grooved surface at present, in addition experimental study only limits to In large-scale wind tunnel experiment, have the shortcomings that at high cost, land occupation is big, time-consuming.For the demand and limitation of the above experimental study Property, the invention proposes a kind of PIV experiment devices for flute surfaces air drag reduction, can measure the pressure of flute surfaces simultaneously Drop and the characteristic in flow field.The device can freely replace flute surfaces, and the variation of its speed is observed with speed instrument, come find as What can the scheme that is preferably minimized of resistance, to design the optimal structure of drag reduction and probe into its drag reduction mechanism by flow field, Effective foundation is provided for aircraft surfaces very low power form slection.
Summary of the invention
For the problems in background technique, the present invention provides a kind of PIV experiment dresses for flute surfaces air drag reduction Set, which can be realized simultaneously two kinds of functions, can free adjustment speed, replaceable different materials grooved surface, by changing The conditions such as groove size and shape, speed of incoming flow of change obtain the pressure drop of flute surfaces, since fluid is when flowing through groove, in groove Inside will form whirlpool, and then generate the power opposite with resistance, reach drag-reduction effect.But due to groove shape size, groove direction, The factors such as fluid velocity can all impact resistance, and different variations can occur for flow field, and therefore, the present invention provides a kind of measurement The method of flute surfaces air property of reduction drag can measure respectively the pressure drop under different condition by PIV network analysis flow field characteristic Size selects most suitable flowing velocity that flow resistance is preferably minimized to design optimal groove dimensions.The present apparatus makes It is wide with range, research application value with higher.
To achieve the above object, The technical solution adopted by the invention is as follows:
A kind of PIV experiment device measuring flute surfaces air property of reduction drag, which includes power device, pressure test Device, PIV system and collection device.Power device is made of blower (1), and blower (1) adjusts control blower by frequency modulator (1) wind speed;Pressure testing system is made of channel (3) and differential manometer;PIV system by CCD camera (10), laser (11) and Computer composition;Collection device is made of collector (12).
Channel (3) is equipped with seal washer (2), and seal washer (2) is fixed by clip, the effect of seal washer (2) It is that connect junction closely seamless, guarantees without air loss.The upstream in channel (3) is equipped with deflector (4), deflector (4) flowing of gas can be made more stable, in addition guarantees that Upstream section wants long enough, keeps the flowing of gas more abundant;It is logical The upstream end in road (3) is provided with a particle generator connecting hole (7) and is used for PIV experiment, and particle generator is occurred by particle Food-grade food oil can be formed a series of oil less than or equal to 1um by nozzle under pressure by device connecting hole (7) Shape particle, oily particle observe the flow field of flute surfaces (6) for excitation laser;It is installed by bolt in the downstream in channel (3) There are flute surfaces (6), different flute surfaces (6) are freely replaced by bolt;In addition in the channel for being equipped with flute surfaces (6) (3) a series of pressure tap (5) is arranged in side wall surface, for connecting differential manometer.The exit in channel (3) is equipped with collector (12), the very strong oil suction towel of one layer of oil absorption is stained in the inside of channel (3), for collecting the oily particulate of 1um, other oil suction towel What be can be convenient is replaced, at low cost.
In order to guarantee the stability and horizontality of platform, channel machined the horizontally-supported of stainless steel material below (3) Frame (8), horizontal shore (8) are fixed by lower square bolt (9) and channel (3), ensure that experiment accuracy.
For PIV system, the transparency for guaranteeing channel (3) is first had to, so channel (3) use the Ya Ke of the high grade of transparency Power plate is process.Laser (11) be located at be furnished with flute surfaces (6) channel (3) top, the camera lens of CCD camera (10) with The laser emitting direction of laser (11) is vertical, and the side wall surface in channel (3) is arranged in CCD camera (10), convenient for observation groove table The flow field situation in face (6) changes the position of laser (11) and CCD camera (10) to the flow field situation of observation flow direction again. Data are finally passed to computer by CCD camera (10), with the system software of computer to the data of CCD camera (10) at Reason.
Compared with prior art, the present invention has the advantages that.
1, the novel place of the present invention be to devise a kind of pressure drop that can measure the flowing of micro-structure surface gas simultaneously and The new method of interior flow field.Wherein flute surfaces can designed, designed, and can freely be dismantled from channel, have and implement letter Just the advantages of.
2, the present invention has rational design, structure is simple, easy to process and installation, can freely adjust speed of incoming flow, freely more Trench material is changed, influence of many factors such as speed of incoming flow, groove shape, groove size and direction to resistance can be calculated, Has the characteristics that efficient, research multiplicity.
3, the present invention can be applied to PIV systematic survey flow field characteristic, have the advantages that it is at low cost, occupy little space.
4, using the method averaged repeatedly is measured when the present invention is calculated, it ensure that the precision of experiment.
Detailed description of the invention
Fig. 1 is whole experimental provision schematic diagram of the invention.
Fig. 2 is the cross-sectional view of lane testing section of the present invention.
Fig. 3 is deflector main view of the present invention.
Fig. 4 is two kinds of flute surfaces schematic diagrames that the present invention uses.
Fig. 5 is the schematic diagram of collection device of the present invention.
In figure: 1. blowers, 2. gasket seals, 3. channels, 4. deflectors, 5. pressure taps, 6. flute surfaces, 7. particles occur Device connecting hole, 8. support frames, 9. lower square bolts, 10.CCD camera, 11. lasers, 12. collectors.
Specific embodiment
Below with reference to Structure Figure and embodiment, the present invention is described in detail.
It a) is the range adjustability for guaranteeing air quantity, the blower (1) for selecting air quantity big, in 1405m3It is adjustable within/h;Selection Gasket seal (2) makes junction not leak out, and then carries out stepping up to fix with the clip of stainless steel material.
B) to make PIV system observe the flowing of flute surfaces, the material selection of channel (3) has the acrylic of high transparency Plate material, with a thickness of 4-8mm.
C) to guarantee that gas flowing is stablized, the deflector (4) of the upstream portion installation 1m long of channel (3);It in addition is guarantee Flowing is more abundant, oily particle is made to have better followability, and a length of 2m of Upstream section of channel (3) installs particle generator Upstream portion in channel (3);The a length of 2m of downstream test section in channel (3) keeps measurement more accurate.
D) when carrying out PIV systematic survey flow field, to guarantee that oily particulate reaches outlet pollution laboratory other equipment, There is the collector (12) of oil suction towel inside the installation of exit.Collector (12) trapezoidal shape guarantees that oily particulate is easier Into in container.
It e) is the accuracy and reliability of guarantee experiment measurement it is necessary to keep the holding of experimental provision platform horizontal, in addition also Reduce the vibration of platform.Installation is fixed with the support frame (8) of the bigger stainless steel material processing of rigidity, and plate thickness is in 6- 10mm。

Claims (3)

1. a kind of PIV experiment device for flute surfaces air drag reduction, it is characterised in that: the device includes power device, pressure Force test device, PIV system and collection device;Power device is made of blower (1), and blower (1) adjusts control by frequency modulator The wind speed of blower (1) processed;Pressure testing system is made of channel (3) and differential manometer;PIV system is by CCD camera (10), laser (11) it is formed with computer;Collection device is made of collector (12);
Channel (3) is equipped with seal washer (2), and seal washer (2) is fixed by clip, and the effect of seal washer (2) is to make Junction closely connect it is seamless, guarantee without air loss;The upstream in channel (3) is equipped with deflector (4), deflector (4) energy Enough make the flowing of gas more stable, in addition to guarantee that Upstream section wants long enough, keep the flowing of gas more abundant;Channel (3) Upstream end be provided with particle generator connecting hole (7) and be used for PIV experiment, particle generator passes through particle generator connection Food-grade food oil can be formed a series of oily particles less than or equal to 1um by nozzle under pressure by hole (7), Oily particle observes the flow field of flute surfaces (6) for excitation laser;The downstream in channel (3) is equipped with groove table by bolt Different flute surfaces (6) are freely replaced in face (6) by bolt;In addition in the side in the channel (3) for being equipped with flute surfaces (6) A series of pressure tap (5) is arranged in wall surface, for connecting differential manometer;The exit in channel (3) is equipped with collector (12), channel (3) the very strong oil suction towel of one layer of oil absorption is stained in inside, and for collecting the oily particulate of 1um, in addition oil suction towel be can be convenient Be replaced, it is at low cost;
In order to guarantee the stability and horizontality of platform, the horizontal shore of stainless steel material machined below channel (3) (8), horizontal shore (8) is fixed by lower square bolt (9) and channel (3), ensure that experiment accuracy;
Laser (11) is located at the top for being furnished with the channel (3) of flute surfaces (6), the camera lens and laser of CCD camera (10) (11) laser emitting direction is vertical, and the side wall surface in channel (3) is arranged in CCD camera (10), convenient for observation flute surfaces (6) Flow field situation changes the position of laser (11) and CCD camera (10) to the flow field situation of observation flow direction again;CCD camera (10) data are finally passed into computer, is handled with data of the system software of computer to CCD camera (10).
2. a kind of PIV experiment device for flute surfaces air drag reduction according to claim 1, it is characterised in that: logical Road (3) is process with acrylic board.
3. a kind of PIV experiment device for flute surfaces air drag reduction according to claim 1, it is characterised in that: receive Storage (12) trapezoidal shape guarantees that oily particulate is easier to enter in container.
CN201811538191.1A 2018-12-16 2018-12-16 A kind of PIV experiment device for flute surfaces air drag reduction Pending CN109556824A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811538191.1A CN109556824A (en) 2018-12-16 2018-12-16 A kind of PIV experiment device for flute surfaces air drag reduction

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811538191.1A CN109556824A (en) 2018-12-16 2018-12-16 A kind of PIV experiment device for flute surfaces air drag reduction

Publications (1)

Publication Number Publication Date
CN109556824A true CN109556824A (en) 2019-04-02

Family

ID=65870152

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201811538191.1A Pending CN109556824A (en) 2018-12-16 2018-12-16 A kind of PIV experiment device for flute surfaces air drag reduction

Country Status (1)

Country Link
CN (1) CN109556824A (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103048114A (en) * 2012-12-19 2013-04-17 浙江大学 Testing device and method for three-dimensional PIV (Particle Image Velocimetry) internal flow field testing system of hydraulic retarder
KR101453213B1 (en) * 2013-10-15 2014-10-23 한국해양과학기술원 Method for Measuring Propeller Wake at Specific Angular Position using PIV in Towing Tank
CN104777164A (en) * 2015-03-30 2015-07-15 天津大学 Large-size measuring experimental apparatus and method for air flow in cabin based on PIV
CN106895957A (en) * 2017-04-09 2017-06-27 北京工业大学 One kind is for disc type experimental provision in micro groove slip drag reduction PIV experiment
CN208187686U (en) * 2018-05-30 2018-12-04 华中科技大学 A kind of experimental rig for probing into surface drag reduction mechanism

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103048114A (en) * 2012-12-19 2013-04-17 浙江大学 Testing device and method for three-dimensional PIV (Particle Image Velocimetry) internal flow field testing system of hydraulic retarder
KR101453213B1 (en) * 2013-10-15 2014-10-23 한국해양과학기술원 Method for Measuring Propeller Wake at Specific Angular Position using PIV in Towing Tank
CN104777164A (en) * 2015-03-30 2015-07-15 天津大学 Large-size measuring experimental apparatus and method for air flow in cabin based on PIV
CN106895957A (en) * 2017-04-09 2017-06-27 北京工业大学 One kind is for disc type experimental provision in micro groove slip drag reduction PIV experiment
CN208187686U (en) * 2018-05-30 2018-12-04 华中科技大学 A kind of experimental rig for probing into surface drag reduction mechanism

Similar Documents

Publication Publication Date Title
Rajaratnam et al. Three-dimensional turbulent wall jets
Park et al. Flow structure around a finite circular cylinder embedded in various atmospheric boundary layers
Stoots et al. A large-scale matched index of refraction flow facility for LDA studies around complex geometries
CN2729678Y (en) Self circulating bernoulli equation experiment instrument
Shirzadi et al. Wind tunnel experiments on cross-ventilation flow of a generic sheltered building in urban areas
CN109556824A (en) A kind of PIV experiment device for flute surfaces air drag reduction
Sohankar et al. Feature of the flow over a finite length square cylinder on a wall at various incidence angles
Li et al. Aerodynamics of a scale model of a high-speed train on a streamlined deck in cross winds
Voutsinas et al. Investigation of bubble size effect on vertical upward bubbly two-phase pipe flow consisted with an abrupt expansion
Choi et al. Measurements of confined, coaxial jet mixing with pressure gradient
Zhan et al. Diffusion of vehicle exhaust pollutants in typical street canyons
Chung et al. Effect of a vertical guide plate on the wind loading of an inclined flat plate
Li et al. Aerodynamic pressures on a 5: 1 rectangular cylinder in sinusoidal streamwise oscillatory flows with non-zero mean velocities
Myers et al. Design, commissioning and performance of a device to vary the turbulence in a recirculating flume
Bettridge et al. Aerodynamic jet steering using steady blowing and suction
El Hassan et al. Non-oscillating/oscillating shear layer over a large deep cavity at low-subsonic speeds
Strickland et al. Vortex shedding from square plates perpendicular to a ground plane
Essel et al. Turbulent characteristics of submerged twin jets
Kumahor et al. Interactions Between the Shear Layer Emanating From Rectangular Cylinders and the Near Wake Region
Zhang et al. Active control of flow over backward facing step by synthetic jets
He et al. Flow visualization of hairpin vortices in a Mach 3.0 flat-plate boundary layer
Ghosh et al. Experimental study of aero foil with wind tunnel setup
Wang et al. Experimental study of Reynolds number effects on wind pressure distributions of 4: 1 rectangular prisms with rounded corners
Xinjian et al. Investigation on the Characteristics of Water Flow over a Backward Facing Step under High Reynolds Number with Particle Image Velocimetry
Butt et al. Investigation of flow over bluff bodies with patterned surface using Laser-Doppler Anemometry

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
RJ01 Rejection of invention patent application after publication

Application publication date: 20190402

RJ01 Rejection of invention patent application after publication