CN105588700B - A kind of evaluating apparatus and method of rotary impact jet stream Complex Flow Status and heat transfer effect - Google Patents
A kind of evaluating apparatus and method of rotary impact jet stream Complex Flow Status and heat transfer effect Download PDFInfo
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- CN105588700B CN105588700B CN201510944752.8A CN201510944752A CN105588700B CN 105588700 B CN105588700 B CN 105588700B CN 201510944752 A CN201510944752 A CN 201510944752A CN 105588700 B CN105588700 B CN 105588700B
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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
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
Abstract
A kind of evaluating apparatus and method of rotary impact jet stream Complex Flow Status and heat transfer effect, three-freedom mechanical arm is provided with experimental stand top cross-bar, collection chamber is provided among experimental stand top, collection chamber bottom stablizes straight pipe by flanged joint and jet nozzle is housed；Jet nozzle lower part is provided with incubator；Air-flow from air-source pump (or wind turbine), through dust removal filter, flows into current stabilization collection chamber, through current stabilization straight pipe, is sprayed by the nozzle of excitation rotating jet, the metal target surface of direct impulse nozzle lower part heating；The Complex Flow Status and its flow parameter of rotary impact fluidic spaces are measured in test equipment by three dimensional particles imaging tachymeter, hot-wire anemometer, passes through the impingement heat transfer effect of heat flow density instrument, thermal infrared imager and temperature sensor measurement target surface；The configuration of the present invention is simple, impacts Complex Flows for research rotating jet and heat-transfer character rule provides a kind of feasible experimental provision and evaluation method.
Description
Technical field
The present invention relates to the fluidised form and phenomenon of Heat technical field of research rotary impact jet stream, especially one kind is related to rotation punching
The evaluating apparatus and method of slap shot stream Complex Flow Status and heat transfer effect, specifically on a kind of rotating jet non-fully developed and fill
Basic experimental study is unfolded in distribution exhibition jet stream fluidised form and heat-transfer character this problem in science, while can be applied to steam turbine leaf
Piece impact Homogeneous Cooling cellular construction design, the nozzle arrangements design of burner, the cooling of electronic component uniform high-efficiency, high temperature
The experimental study in the fields such as plate large area Homogeneous Cooling, and can be made as one kind understand rotating jet Complex Flow Status and
The general teaching and research instrument of phenomenon of Heat.
Background technology
In existing heat transfer intensification technology, impact jet flow is to improve one of local heat transfer coefficient most efficient method.So
And many experiments of single smooth circular hole jet stream show:The heat transfer coefficient of impact target surface can form " bell " distribution, i.e. Nu Saier
Number has maximum near stagnation region, and radially exponentially rule is successively decreased rapidly since stagnation region afterwards.
By taking turbine blade cooling as an example, the smooth circular hole group impinging cooling turbine leaf of the different array formats of generally use
Piece, cooled regional temperature are remarkably decreased so that and integral surface Temperature Distribution is very uneven, causes wall to form " cold spot ",
Very big thermal stress can be so produced, therefore smooth array of circular apertures impinging cooling structure can seriously undermine the structural strength of blade.
Jet impulse cooling has the features such as cooling is fast, and cold effect is high, and flow resistance is small, is widely adopted, but use this cooling
Technology, while efficiently cooling is realized, how to solve the uneven of cooling is to realize high-temperature component low thermal stress, highly reliable fortune
One of capable core key problem.The it is proposed of rotating jet, makes impact air-flow after by that can excite the nozzle of rotating jet, spray
Go out air-flow in addition to axial velocity, can also produce tangential rotary speed, so not only increase the disturbance of impact space air-flow,
Impact core space is also set outwards to have expanded impact jet flow active cooling surface product at the same time, so as to be expected to realize that the heat exchange of impact target surface is equal
Homogenize.However, relevant systematization experiment is lacked with regard to the rotating jet impinging cooling fluidised form and heat transfer mechanism of rotating jet at present
Research and its device.
The relatively traditional circular hole impact jet flow of rotary impact jet stream, is geometry complexity first, is related to the knot of nozzle
Configuration state (such as helix angle, helicla flute number, grooved size, area ratio etc.), impact opening to target surface distance, target surface shape, penetrate
Fluid space form, the physical parameter for cooling down medium, flow regime, target surface heat flow density etc. can all produce flowing and heat transfer effect
Influence, to make the relation between these factors clear, it is necessary to carry out basic experimental study, there is presently no a synthesis
Basic experimental provision, to carry out the further investigation of rotary impact jet stream fluidised form and heat transfer effect.
Existing single circular hole jet stream experimental provision has the following disadvantages：
1) existing apparatus can only measure the average speed of jet-stream wind amount and jet expansion, it is impossible to measure jet expansion air-flow
Fluctuation velocity, frequency and turbulence level.That is the jet-stream wind of permanent steady flow can only be analyzed, and cannot measure with
The jet-stream wind of ripple frequency or complicated vorticity.
2) existing apparatus is empty almost without quantitative determination jet stream simply using the flow field of qualitative method analysis fluidic spaces
Between flow parameter and its evolutionary process.
3) existing apparatus does not provide fluidic spaces and clearly defines, and is usually all free jet space, i.e., not upper
The fluidic spaces of plate washer limitation.
4) existing apparatus is all the system heat loss for simply estimating target surface, so cannot certainly will accurately determine changing for target surface
Thermal effect.
5) existing apparatus nozzle arrangements are in the form of a single and are relatively fixed, and are not easy to replace test nozzle.
The content of the invention
In order to overcome existing impact jet flow experimental provision measurement data amount few, the shortcomings that accuracy is relatively low；Expand reality at the same time
The rotary impact jet flow and phenomenon of Heat of complexity are now studied, it is an object of the invention to provide a kind of rotary impact jet stream to answer
The evaluating apparatus and method of miscellaneous fluidised form and heat transfer effect, have the characteristics that accuracy rate is high.
In order to achieve the above object, the technical scheme is that：
A kind of evaluating apparatus of rotary impact jet stream Complex Flow Status and heat transfer effect, including experimental stand 8, experimental stand 8
Four columns on be both provided with scale 14, be provided with three-freedom mechanical arm 17, experimental stand at 8 top cross-bar of experimental stand
Collection chamber 1 is provided among 8 tops, 1 entrance of collection chamber is provided with reserved cigarette line and trace particle interface 3,1 bottom of collection chamber
Straight pipe 4 is stablized by flanged joint, stablizes straight pipe 4 and rotation jet nozzle 6 is installed with by nozzle fixture 5；Rotation
6 lower part of jet nozzle is provided with incubator 12.
8 surrounding of experimental stand is provided with protection plate washer 18.
The collection chamber 1 is internally provided with current stabilization mesh screen 2, and current stabilization mesh screen 2 is made of the sheet metal intersected in length and breadth.
The jet nozzle 6, it exports the transparent plate washer 7 of liftable, the liftable for being provided with same level height
Transparent 7 both ends of plate washer are installed on the liftable groove 13 of 8 column of experimental stand.
The stabilization straight pipe 4 is connected by end flanges 4-1 with 5 axial locking of nozzle fixture, nozzle fixture 5 and rotation
Turn the connection of 6 Peripheric locking of jet nozzle, jet nozzle 6 on end flanges 4-1 contact surfaces with being provided with high-temperature resistant seal ring
4-2。
The incubator 12 includes target surface 9, high temperature insulating plate 10 and the thermal insulation material 11 that stacking is set gradually, incubator
12 are installed on the liftable groove 13 of 8 column of experimental stand.
The target surface 9 is stainless steel metal thin slice, and surface is provided with the tracting pressuring hole of meter font arrangement or array arrangement
15-1, tracting pressuring hole 15-1 and 16 arranged for interval of thermocouple；9 both sides of target surface are provided with short-circuit heating plate interface 9-1.
9 shape of target surface includes plane, male and fomale(M＆F) and arc surface.
The transparent plate washer 7 of the liftable and incubator 12 and the column contact position of experimental stand 8 are both provided with scale
Pointer 14-1.
The evaluation method of rotary impact jet stream Complex Flow Status and heat transfer effect based on above device, step are：
Step 1: in 6 jet port of jet nozzle, the probe that tests the speed of setting hot-wire anemometer 22；Put down in fluidic spaces
Capable side sets three dimensional particles to be imaged tachymeter 19, be separately installed with three-freedom mechanical arm 17 thermal infrared imager 21,
Dipulse YAG laser generators 20, post the detection patch of heat flow density instrument 23 on target surface 9；Short-circuit heating plate interface 9-1 connects
Connect short-circuit heater 24；Collection chamber 1 is both provided with pressure-measuring pipe 15 and thermocouple 16 with target surface 9, and the data obtained is all connected to data
Acquisition system 25；
Step 2: cooling medium enters collection chamber 1, by after 2 current stabilization of current stabilization mesh screen, into stablizing, straight pipe 4 is rotated to be penetrated
Flow nozzle 6 produces rotating jet after exciting and rushes at target surface 9, and fluidic spaces are constrained by the transparent plate washer 7 of liftable, by adjusting
The distance of the Level Change fluidic spaces of incubator 12, the jet nozzle 6 of 5 replaceable different structure of nozzle fixture；
Step 3: fluctuation velocity, the frequency of probe measurement 6 exit flow of jet nozzle that tests the speed of hot-wire anemometer 22
And turbulence level；Trace particle (small non pinetallic nano level fluorescent grain) is added with trace particle interface 3 by reserved cigarette line
Coordinate three dimensional particles imaging tachymeter 19 and dipulse YAG laser generators 20, a pair of of 2048x2048 resolution ratio can be captured
Flow field figure picture, the 3D velocity field of jet stream in given fluidic spaces can be quantified by flow field figure picture, and then determine that jet stream is complicated
The Vorticity Field of eddy structure, so as to disclose the complicated flow pattern and its Evolution of complex rotation jet stream；Pass through the pressure measurement on target surface 9
Pipe 15 measures the static pressure distribution of target surface；Target surface temperature is measured using thermocouple 16, while target surface is measured using thermal infrared imager 21
Temperature field, the temperature of such thermocouple measurement can further correct the temperature field that the measurement of thermal infrared imager 21 obtains；Pass through
Short-circuit 24 Current Voltage size of heater is adjusted to control 9 heat flow density of target surface；
Step 4: measuring the actual heat flow density q of target surface 9 using heat flow density instrument 23, the coefficient of heat transfer of target surface 9 is：H=
q/(Tw-T0), T in formulawFor target surface temperature, T0Collection chamber coolant temperature, the theoretical heat flow density q of target surface0(W/m2),q0=
The voltage U that IU/A is multiplied target surface both ends by target surface short circuit heater current I is drawn, accurately draws the device system under different working conditions
System heat waste rate.
In order to realize, jet expansion to the impact distance of target surface, devises liftable to the present invention in accurate adjusting fluidic spaces
Transparent plate washer 7 and liftable incubator 12.By unclamping lock-screw plate washer can be realized with being moved down on target surface incubator
It is dynamic, the scale on Binding experiment device rack, so as to directly read impact distance.Excite 6 structure of nozzle of rotary impact jet stream
Form is very more, and alternative research sample size is big, using 5 device of nozzle fixture, it is possible to achieve multiple experiment rotating jets
The convenient handling of nozzle 6, while ensure and stablize straight pipe 4 and be closely engaged.
The beneficial effects of the invention are as follows：1. it is powerful, it can realize the jet media of different physical parameters, different structure
The test nozzle of form, different shape fluidic spaces, different shape target surface and its single hole or porous impact under heating condition
Jet stream cooling experiment；2. test data is full and accurate, on flow field survey, the fluctuation velocity of jet expansion air-flow, frequency and disorderly are measured
Mobility, while also can qualitative, quantitative measure fluidic spaces flow location form and flow parameter；Pass through " rice " font cluster point layout
Mode, measures the Surface Static Pressure and temperature of target surface.3. test data accuracy is high, (small nonmetallic to receive using trace particle
Meter level fluorescent grain) and three dimensional particles imaging tachymeter 19, flow field, velocity field and the Vorticity Field of online record fluidic spaces.Adopt
Point-field combination is taken, realizes Accurate Determining target surface temperature.4. the present invention, which can be made as one kind, understands the complicated stream of rotating jet
The general teaching and research instrument of state and phenomenon of Heat.
Brief description of the drawings
Fig. 1 is the general structure schematic diagram of the present invention.
Fig. 2 is 5 structure chart of nozzle fixture, and wherein Fig. 2A is front view, and Fig. 2 B are sectional view.
Fig. 3 is 9 point layout schematic diagram of target surface, and wherein Fig. 3 A arrange schematic diagram for rice font, and Fig. 3 B arrange for array type
Schematic diagram.
Fig. 4 is the schematic diagram of experimental bench scale 14.
Embodiment
Present invention is described in further detail below in conjunction with the accompanying drawings.
The present invention provides a kind of experimental provision and evaluation method for being used for rotating jet fluidised form and heat transfer effect, in the reality
Test on platform, circular hole can be carried out, excite the single hole of rotating jet and the multiple jet impact fluidised form of different spread patterns and heat exchange effect
The research of fruit.This experimental bench can simulate various jet impulse coolings, and the experimental data of acquisition can be applied directly to impinging cooling
Research structure design.
As shown in Figure 1, the evaluating apparatus of rotary impact jet stream Complex Flow Status and heat transfer effect, including experimental stand 8, experiment
Scale 14 is both provided with the four columns of rack 8, three-freedom mechanical arm 17 is provided with 8 top cross-bar of experimental stand, it is real
Test among 8 top of rack and be provided with collection chamber 1,1 entrance of collection chamber is provided with reserved cigarette line and trace particle interface 3, is used for
Observation directly perceived and the form in shooting rotating jet flow field；Straight pipe 4 is stablized in 1 bottom of collection chamber by flanged joint, stablizes straight tube
Section 4 is installed with jet nozzle 6 by nozzle fixture 5；6 lower part of jet nozzle is provided with incubator 12.
8 surrounding of experimental stand is provided with protection plate washer 18.
The collection chamber 1 is internally provided with current stabilization mesh screen 2, and current stabilization mesh screen 2 is made of the sheet metal intersected in length and breadth.
The jet nozzle 6, it exports the transparent plate washer 7 of liftable, the liftable for being provided with same level height
Transparent plate washer 7 is installed on the liftable groove 13 of 8 column of experimental stand；It is easy to implement concordant with nozzle face holding.
The incubator 12 includes target surface 9, high temperature insulating plate 10 and the thermal insulation material 11 that stacking is set gradually.Incubator
12 are installed on the liftable groove 13 of 8 column of experimental stand, can move up and down, be conveniently adjusted fluidic spaces size.
The transparent plate washer 7 of the liftable and incubator 12 and the column contact position of experimental stand 8 are both provided with scale
Pointer 14-1.
As shown in Fig. 2, the stabilization straight pipe 4 is connected by end flanges 4-1 with 5 axial locking of nozzle fixture, spray
Mouth fixture 5 is connected with 6 Peripheric locking of jet nozzle, and jet nozzle 6 is resistance to being provided with end flanges 4-1 contact surfaces
High-temperature seal ring 4-2, air-tightness is reliable, convenient for disassembly and assembly, can install the jet nozzle 6 of different inner fluted structures.
The target surface 9 is stainless steel metal thin slice, and surface is provided with the tracting pressuring hole of meter font arrangement or array arrangement
15-1, tracting pressuring hole 15-1 and 16 arranged for interval of thermocouple；9 both sides of target surface are provided with short-circuit heating plate interface 9-1.As shown in figure 3,
There is the reserved tracting pressuring hole 15-1 of diameter 1mm on target surface, pressure guiding pipe 15 is connected using flexible metallic hose with target surface tracting pressuring hole 15-1, cloth
3~5 times that scope recommended value is experimental nozzle equivalent diameter are put, also can voluntarily be set according to requirement of experiment, thermocouple 16 is arranged
Scope recommended value is 8~10 times of experimental nozzle equivalent diameter, also can voluntarily be set according to requirement of experiment.
9 shape of target surface includes but not limited to plane, male and fomale(M＆F), complex-curved and imitative turbo blade leading edge difference
Shape target surface.
As shown in figure 4, use four sides groove for the scale and lower margin schematic diagram, this experimental stand, overall structure of experimental bench
Aluminium section bar, each junction are connected using L-type contiguous block, and nonadjustable signal 14 is equipped with surrounding column, and precision is grade, are met
Requirement of experiment, liftable transparent plate washer and target surface unit, corner are designed with tuning drive gear 14-1, and experimenter regulates required
After the height wanted, impulse nozzle can be read according to pointer to the distance of target surface, it is contemplated that had between transparent plate washer 7 and target surface 9
A large amount of impact air-flow outflows, are especially provided with adjustable transparency protected plate washer 18 up and down in the region, can so be easy to observation,
Again can Protection personnel.Bottom is provided with four burr adjustable tail margins 26, to adapt to the ground of out-of-flatness, and can suitably raise experiment
Platform, passes through in order to heat cable, thermocouple, pressure guiding pipe from lower curtate.
The evaluation method of rotary impact jet stream Complex Flow Status and heat transfer effect based on above device, step are：
Step 1: in 6 jet port of jet nozzle, the probe that tests the speed of setting hot-wire anemometer 22；Put down in fluidic spaces
Capable side sets three dimensional particles to be imaged tachymeter 19, be separately installed with three-freedom mechanical arm 17 thermal infrared imager 21,
Dipulse YAG laser generators 20, post the detection patch of heat flow density instrument 23 on target surface 9；Short-circuit heating plate interface 9-1 connects
Connect short-circuit heater 24；Collection chamber 1 is both provided with pressure-measuring pipe 15 and thermocouple 16 with target surface 9, and the data obtained is all connected to data
Acquisition system 25；
Step 2: cooling medium enters collection chamber 1, by after 2 current stabilization of current stabilization mesh screen, into stablizing, straight pipe 4 is rotated to be penetrated
Flow nozzle 6 produces rotating jet after exciting and rushes at target surface 9, and fluidic spaces are constrained by the transparent plate washer 7 of liftable, by adjusting
The distance of the Level Change fluidic spaces of incubator 12, the jet nozzle 6 of 5 replaceable different structure of nozzle fixture；
Step 3: fluctuation velocity, the frequency of probe measurement 6 exit flow of jet nozzle that tests the speed of hot-wire anemometer 22
And turbulence level；Trace particle (small non pinetallic nano level fluorescent grain) is added with trace particle interface 3 by reserved cigarette line
Coordinate three dimensional particles imaging tachymeter 19 and dipulse YAG laser generators 20, a pair of of 2048x2048 resolution ratio can be captured
Flow field figure picture, the 3D velocity field of jet stream in given fluidic spaces can be quantified by flow field figure picture, and then determine that jet stream is complicated
The Vorticity Field of eddy structure, so as to disclose the complicated flow pattern and its Evolution of complex rotation jet stream；Pass through the pressure measurement on target surface 9
Pipe 15 measures the static pressure distribution of target surface, and the Intensity Design that the mechanical property of target surface is impacted for rotating jet provides basic data.Adopt
Target surface temperature is measured with thermocouple 16, while the temperature field of target surface is measured using thermal infrared imager 21, such thermocouple measurement
Temperature can further correct the temperature field that the measurement of thermal infrared imager 21 obtains, and this point-field combines measurement method, can be accurate
Measure the temperature of target surface.The actual heat flow density of target surface is directly measured with heat flow density instrument, without using simplified reason
The heat loss (be radiated to the heat of surrounding outer environment and be conducted to the heat of heat insulating slab at bottom) of estimation target surface is gone by formula.It is logical
Short-circuit 24 Current Voltage size of heater is overregulated to control 9 heat flow density of target surface；
Step 4: measuring the actual heat flow density q of target surface 9 using heat flow density instrument 23, the coefficient of heat transfer of target surface 9 is：H=
q/(Tw-T0), T in formulawFor target surface temperature, T0Collection chamber coolant temperature.The theoretical heat flow density q of target surface0(W/m2),q0=
The voltage U that IU/A is multiplied target surface both ends by target surface short circuit heater current I is drawn, can accurately provide the dress under different working conditions
System heat waste rate is put, the deficiency of heat loss in experiment can only be estimated by overcoming existing apparatus, so as to more accurately determine rotation
The cooling effect of jet stream.
The present invention includes but not limited to above-mentioned embodiment, and persons skilled in the art are disclosed according to the present invention
Content, can use other a variety of embodiments to implement the present invention, therefore, every design structure using the present invention and think of
Think, do some simple designs changed and change, both fall within the scope of protection of the invention.
Claims (9)
1. the evaluating apparatus of a kind of rotary impact jet stream Complex Flow Status and heat transfer effect, it is characterised in that including experimental stand
(8), scale (14) is both provided with the four columns of experimental stand (8), three are provided with experimental stand (8) top cross-bar freely
Mechanical arm (17) is spent, is provided with collection chamber (1) among experimental stand (8) top, collection chamber (1) entrance is provided with reserved cigarette line
With trace particle interface (3), straight pipe (4) is stablized in collection chamber (1) bottom by flanged joint, stablizes straight pipe (4) and passes through spray
Mouth fixture (5) is installed with jet nozzle (6)；Jet nozzle (6) lower part is provided with incubator (12)；
The jet nozzle (6), it exports the transparent plate washer of liftable (7) for being provided with same level height, liftable
Transparent plate washer (7) both ends are installed on the liftable groove (13) of experimental stand (8) column.
2. the evaluating apparatus of a kind of rotary impact jet stream Complex Flow Status according to claim 1 and heat transfer effect, its feature
It is, the experimental stand (8) surrounding is provided with protection plate washer (18).
3. the evaluating apparatus of a kind of rotary impact jet stream Complex Flow Status according to claim 1 and heat transfer effect, its feature
It is, the collection chamber (1) is internally provided with current stabilization mesh screen (2), and current stabilization mesh screen (2) is by the sheet metal structure that intersects in length and breadth
Into.
4. the evaluating apparatus of a kind of rotary impact jet stream Complex Flow Status according to claim 1 and heat transfer effect, its feature
It is, the stabilization straight pipe (4) is connected by end flanges (4-1) with nozzle fixture (5) axial locking, nozzle fixture
(5) it is connected with jet nozzle (6) Peripheric locking, jet nozzle (6) on end flanges (4-1) contact surface with being provided with
High-temperature resistant seal ring (4-2).
5. the evaluating apparatus of a kind of rotary impact jet stream Complex Flow Status according to claim 1 and heat transfer effect, its feature
It is, the incubator (12) includes target surface (9), high temperature insulating plate (10) and the thermal insulation material (11) that stacking is set gradually,
Incubator (12) is installed on the liftable groove (13) of experimental stand (8) column.
6. the evaluating apparatus of a kind of rotary impact jet stream Complex Flow Status according to claim 5 and heat transfer effect, its feature
It is, the target surface (9) is stainless steel metal thin slice, and surface is provided with the tracting pressuring hole of meter font arrangement or array arrangement
(15-1), tracting pressuring hole (15-1) and thermocouple (16) arranged for interval；Target surface (9) both sides are provided with short-circuit heating plate interface (9-1).
7. the evaluating apparatus of a kind of the rotary impact jet stream Complex Flow Status and heat transfer effect according to claim 5 or 6, it is special
Sign is that the target surface (9) shape includes plane, male and fomale(M＆F) and arc surface.
8. the evaluating apparatus of a kind of rotary impact jet stream Complex Flow Status according to claim 1 and heat transfer effect, its feature
It is, the transparent plate washer of the liftable (7) and incubator (12) and the column contact position of experimental stand (8) are both provided with quarter
Spend pointer (14-1).
9. rotary impact jet stream Complex Flow Status and heat transfer effect based on claim 1-8 any one claim described devices
Evaluation method, it is characterised in that step is：
Step 1: in jet nozzle (6) jet port, the probe that tests the speed of setting hot-wire anemometer (22)；Put down in fluidic spaces
Capable side sets three dimensional particles to be imaged tachymeter (19), and thermal infrared imager is separately installed with three-freedom mechanical arm (17)
(21), dipulse YAG laser generators (20), post the detection patch of heat flow density instrument (23) on target surface (9)；Short circuit heating
The short-circuit heater (24) of piece interface (9-1) connection；Collection chamber (1) is both provided with pressure-measuring pipe (15) and thermocouple with target surface (9)
(16)；The data obtained is all connected to data collecting system (25)；
Step 2: cooling medium enters collection chamber (1), by rotated into straight pipe (4) is stablized after current stabilization mesh screen (2) current stabilization
Rotating jet is produced after jet nozzle (6) excitation and rushes at target surface (9), and fluidic spaces are constrained by the transparent plate washer of liftable (7),
By adjusting the distance of the Level Change fluidic spaces of incubator (12), the rotary irradiating of nozzle fixture (5) replaceable different structure
Flow nozzle 6；
Step 3: the fluctuation velocity, frequency of probe measurement jet nozzle (6) exit flow that tests the speed of hot-wire anemometer (22)
And turbulence level；Adding trace particle with trace particle interface (3) by reserved cigarette line coordinates three dimensional particles to be imaged tachymeter (19)
With dipulse YAG laser generators (20), the flow field figure picture of a pair of of 2048x2048 resolution ratio can be captured, by flow field figure picture
The 3D velocity field of jet stream in given fluidic spaces can be quantified, and then determines the Vorticity Field of jet stream complexity eddy structure, so that
Disclose the complicated flow pattern and its Evolution of complex rotation jet stream；The quiet of target surface is measured by the pressure-measuring pipe (15) on target surface (9)
Pressure distribution；Target surface temperature is measured using thermocouple (16), while the temperature field of target surface is measured using thermal infrared imager (21), so
The temperature of thermocouple measurement can further correct the temperature field that thermal infrared imager (21) measurement obtains；By adjusting short circuit heating
Device (24) Current Voltage size controls target surface (9) heat flow density；
Step 4: using the heat flow density q of heat flow density instrument (23) measure target surface (9) reality, the coefficient of heat transfer of target surface (9) is：h
=q/ (Tw-T0), T in formulawFor target surface temperature, T0Collection chamber coolant temperature, the theoretical heat flow density q of target surface0(W/m2),q0
The voltage U that=IU/A is multiplied target surface both ends by target surface short circuit heater current I is drawn, accurately draws the device under different working conditions
System heat waste rate.
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