CN105588700A - Evaluation device and method for complex flow regime and heat transfer effect of swirling impinging jet - Google Patents
Evaluation device and method for complex flow regime and heat transfer effect of swirling impinging jet Download PDFInfo
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- CN105588700A CN105588700A CN201510944752.8A CN201510944752A CN105588700A CN 105588700 A CN105588700 A CN 105588700A CN 201510944752 A CN201510944752 A CN 201510944752A CN 105588700 A CN105588700 A CN 105588700A
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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
The invention provides an evaluation device and a method for the complex flow regime and heat transfer effect of a swirling impinging jet. The top crossbeam part of an experiment table is provided with a three-degree-of-freedom mechanical arm. The upper middle part of the experiment table is provided with a gas collection chamber. The bottom of the gas collection chamber is connected with a stable straight pipe section via a flange to be provided with a swirling jet nozzle. The lower part of the swirling jet nozzle is provided with an insulation can. An air flow, provided by a gas source pump (or a blower fan), passes through a dust removal filter to flow into the steady-flow gas collection chamber, and then is sprayed out of the swirling jet nozzle after passing through the steady-flow straight pipe section so as to directly impinge a metal target surface heated at the lower part of the nozzle. Inside a test instrument, a three-dimensional particle imaging tachometer and a hot-wire anemometer are arranged to measure the complex flow state and the flow parameter thereof in a swirling impinging jet space. Meanwhile, a hot-fluid density instrument, a thermal infrared imager and a temperature sensor are arranged to test the impinging heat-transfer effect of the target surface. According to the technical scheme of the invention, the device is simple in structure. The device and the method provide a feasible experiment device and an evaluation method for the research on the impinging complex flow of a swirling jet and the heat-transfer characteristic rule.
Description
Technical field
The present invention relates to study fluidised form and the phenomenon of Heat technical field of rotary impact jet, specialRelate to evaluating apparatus and the method for rotary impact jet Complex Flow Status and heat transfer effect, concreteBe about a kind of rotating jet non-fully developed and fully development jet fluidised form and heat-transfer character thisOne problem in science launches basic experimental study, can be applicable to turbine blade simultaneously and impacts allHomogenize cooling unit structural design, the nozzle arrangements of burner designs, electronic devices and components are evenly highImitate the experimental study in the field such as cooling, high temperature sheet Large-Area-Uniformization is cooling, and can makeAs a kind of general teaching and research instrument of understanding rotating jet Complex Flow Status and phenomenon of Heat.
Background technology
In existing heat transfer intensification technology, impact jet flow is that raising local heat transfer coefficient is the most effectiveOne of method. But the great many of experiments of single smooth circular hole jet shows: the biography of impacting target surfaceHot coefficient can form " bell " and distribute, and nusselt number has maximum near stagnation region,Start to be afterwards radially exponential law successively decreases rapidly from stagnation region.
Taking turbine blade cooling as example, the smooth circular hole group punching of the different array formats that conventionally adoptHit cooling turbine bucket, the remarkable decline of the regional temperature that is cooled, divides integral surface temperatureCloth is very inhomogeneous, causes wall to form " cold spot ", can produce so very large thermal stress, because ofThis smooth array of circular apertures impact cooling structure can seriously undermine the structural strength of blade.
Jet impulse is cooling to be had cooling soon, and the feature such as cold effect is high, and flow resistance is little, is widely adopted,But adopt this cooling technology, in realizing high efficiency cooling, how to solve cooling inequalityEven is one of core key issue of realizing high-temperature component low thermal stress, highly reliable operation. RotationThe proposition of jet, makes impact air-flow after the nozzle by exciting rotating jet, ejection air-flowExcept axial velocity, also can produce tangential rotary speed, so not only strengthen and impacted skyBetween the disturbance of air-flow, also make to impact core space and outwards expanded impact jet flow active cooling surface simultaneouslyLong-pending, thus be expected to realize the heat exchange homogenising of impacting target surface. But, at present with regard to rotating jetRotating jet impacts cooling fluidised form and heat transfer mechanism, lack relevant systematization experimental study andDevice.
The circular hole impact jet flow that rotary impact jet is relatively traditional, is first geometry complexity,Relate to nozzle structural form (as lead angle, helicla flute number, grooved size, areaCompare etc.), impact opening is to target surface distance, target surface shape, fluidic spaces form, cooling mediumPhysical parameter, flow regime, target surface heat flow density etc. all can flow and heat transfer effect generation shadowsRing, make the relation between these factors clear, just need to carry out basic experimental study,Go back at present the experimental provision of neither one composite basis, carry out rotary impact jet fluidised form withThe further investigation of heat transfer effect.
Existing single circular hole jet experimental provision has the following disadvantages:
1) existing apparatus can only be measured the average speed of jet-stream wind amount and jet expansion, can notMeasure fluctuation velocity, frequency and the turbulence level of jet expansion air-flow. That is to say to analyze and determineThe jet-stream wind of normal steady flow, and can not measure with ripple frequency or complicated vorticityJet-stream wind.
2) existing apparatus adopts qualitative method to analyze the flow field of fluidic spaces simply, does not almost haveThere are flow parameter and the evolutionary process thereof of quantitative assay fluidic spaces.
3) existing apparatus does not provide clear and definite defining to fluidic spaces, is all freely to penetrate conventionallyFluid space, does not go up the fluidic spaces of plate washer restriction.
4) existing apparatus is all the system heat loss of estimating simply target surface, and being bound to like this can notAccurately determine the heat transfer effect of target surface.
5) existing apparatus nozzle arrangements form is single and relatively fixing, is difficult for changing test nozzle.
Summary of the invention
Few in order to overcome existing impact jet flow experimental provision measurement data amount, what the degree of accuracy was on the low side lacksPoint; Expand rotary impact jet flow and the phenomenon of Heat of the Study of the Realization complexity, the present invention simultaneouslyObject be to provide the evaluating apparatus of a kind of rotary impact jet Complex Flow Status and heat transfer effectAnd method, have the advantages that accuracy rate is high.
In order to achieve the above object, technical scheme of the present invention is:
An evaluating apparatus for rotary impact jet Complex Flow Status and heat transfer effect, comprises experimental benchFrame 8, is provided with scale 14 on four root posts of experimental stand 8, experimental stand 8 top horizontal strokesLiang Chu is provided with three-freedom mechanical arm 17, and experimental stand is provided with collection chamber 1 in the middle of 8 tops,Collection chamber 1 import department is provided with reserved cigarette line and trace particle interface 3, and collection chamber 1 bottom is logicalCross flange stable connection straight length 4, stablize straight length 4 and be installed with rotation by nozzle jig 5Jet nozzle 6; Jet nozzle 6 bottoms are provided with incubator 12.
Described experimental stand 8 surroundings are provided with protection plate washer 18.
Described collection chamber 1 inside is provided with current stabilization mesh screen 2, and current stabilization mesh screen 2 is by intersecting in length and breadthSheet metal form.
Described jet nozzle 6, it is saturating that its outlet is provided with the liftable of same level heightBright plate washer 7, the transparent plate washer of liftable 7 two ends are installed on the liftable groove of experimental stand 8 columnsOn 13.
Described stable straight length 4 is close to by end face flange 4-1 and nozzle jig 5 axial lockConnect, nozzle jig 5 is connected with jet nozzle 6 Peripheric lockings, jet nozzle 6 withOn end face flange 4-1 contact-making surface, be provided with high-temperature resistant seal ring 4-2.
Described incubator 12 comprises the stacked target surface setting gradually 9, high temperature insulating plate 10 andInsulation material 11, incubator 12 is installed on the liftable groove 13 of experimental stand 8 columns.
Described target surface 9 is stainless steel metal thin slice, and surface is provided with meter font and arranges or arrayThe tracting pressuring hole 15-1 that formula is arranged, tracting pressuring hole 15-1 and thermocouple 16 intervals are arranged; 9 liang of target surfacesSide is provided with short circuit heating plate interface 9-1.
Described target surface 9 shapes comprise plane, male and fomale(M&F) and arc surface.
The transparent plate washer 7 of described liftable contacts with the column of experimental stand 8 with incubator 12Position is provided with tuning drive gear 14-1.
Rotary impact jet Complex Flow Status based on said apparatus and the evaluation method of heat transfer effect,Step is:
Step 1, at jet nozzle 6 jets, testing the speed of hot-wire anemometer 22 is setProbe; In the parallel side of fluidic spaces, three dimensional particles imaging tachymeter 19 is set, three certainlyBy being separately installed with thermal infrared imager 21, dipulse YAG laser generator on degree mechanical arm 1720, on target surface 9, post the detection paster of heat flow density instrument 23; Short circuit heating plate interface 9-1Connect short circuit heater 24; Collection chamber 1 is provided with pressure-measuring pipe 15 and thermocouple with target surface 916, the data obtained is all connected to data collecting system 25;
Step 2, cooling medium enter collection chamber 1, steady by entering after current stabilization mesh screen 2 current stabilizationsDetermine straight length 4 and after jet nozzle 6 excites, produce rotating jet and rush at target surface 9, pass throughThe transparent plate washer 7 of liftable retrains fluidic spaces, by adjusting the Level Change of incubator 12The distance of fluidic spaces, the jet nozzle 6 of nozzle jig 5 replaceable different structures;
The probe measurement jet nozzle 6 that tests the speed of step 3, hot-wire anemometer 22 is worked off one's feeling vent one's spleenFluctuation velocity, frequency and the turbulence level of stream; Add by reserved cigarette line and trace particle interface 3Trace particle (small nonmetal nanoscale fluorescent grain) coordinates three dimensional particles imaging tachymeter19 and dipulse YAG laser generator 20, can capture a pair of 2048x2048 resolution ratioFlow field figure picture, by flow field figure picture can quantitative given fluidic spaces in the three-dimensional velocity of jet, and then the Vorticity Field of the complicated eddy structure of definite jet, thereby announcement complex rotation jetComplicated flow pattern and Evolution thereof; Measure the static pressure of target surface by the pressure-measuring pipe 15 on target surface 9Distribute; Adopt thermocouple 16 to measure target surface temperature, adopt thermal infrared imager 21 to measure target simultaneouslyThe temperature field of face, the temperature of thermocouple measurement can further be revised thermal infrared imager 21 like thisMeasure the temperature field obtaining; Control target by regulating short circuit heater 24 current/voltage sizesFace 9 heat flow densities;
Step 4, use heat flow density instrument 23 are measured the heat flow density q of target surface 9 reality, targetThe coefficient of heat transfer of face 9 is: h=q/ (Tw-T0), T in formulawFor target surface temperature, T0Collection chamber is coolingMedium temperature, the theoretical heat flow density q of target surface0(W/m2),q0=IU/A is by target surface short circuitHeater current I takes advantage of the voltage U at target surface two ends to draw, accurately draws under different working conditionsApparatus system heat waste rate.
The present invention is in order to realize in accurate adjusting fluidic spaces jet expansion to the impact distance of target surfaceFrom, design the transparent plate washer 7 of liftable and liftable incubator 12. By unclamping lockingScrew just can realize moving up and down of plate washer and target surface incubator, in conjunction with on experimental provision standScale, thus impact distance directly read. Excite nozzle 6 structural forms of rotary impact jetVery many, alternative research sample size is large, adopts nozzle jig 5 to install, and can realizeThe convenient handling of multiple experiment jet nozzles 6, ensure simultaneously and stable straight length 4 tightInterlock.
The invention has the beneficial effects as follows: 1. powerful, can realize penetrating of different physical parametersFlow medium, the test nozzle of different structure form, different shape fluidic spaces, different shape targetSingle hole under face and heating condition thereof or the cooling experiment of porous impact jet; 2. test data is detailedReal, on flow field survey, the fluctuation velocity of gaging nozzle exit flow, frequency and turbulence level,Also can measure fluidic spaces flow location form and flow parameter by qualitative, quantitative simultaneously; By " rice " wordType cluster measuring point arrangement, Surface Static Pressure and the temperature of mensuration target surface. 3. test data is accurateSpend high, use trace particle (small nonmetal nanoscale fluorescent grain) become with three dimensional particlesPicture tachymeter 19, flow field, velocity field and the Vorticity Field of online record fluidic spaces. Take a little-combination, realizes Accurate Determining target surface temperature. 4. the present invention can be made as a kind of understandingThe general teaching and research instrument of rotating jet Complex Flow Status and phenomenon of Heat.
Brief description of the drawings
Fig. 1 is general structure schematic diagram of the present invention.
Fig. 2 is nozzle jig 5 structure charts, and wherein Fig. 2 A is front view, and Fig. 2 B is cutaway view.
Fig. 3 is that target surface 9 measuring points are arranged schematic diagram, and wherein Fig. 3 A is that rice font is arranged schematic diagram,Fig. 3 B is that array type is arranged schematic diagram.
Fig. 4 is the schematic diagram of experimental bench scale 14.
Detailed description of the invention
Below in conjunction with accompanying drawing, content of the present invention is described in further detail.
The invention provides a kind of experimental provision for rotating jet fluidised form and heat transfer effect andEvaluation method, on this experimental bench, can carry out circular hole, the single hole that excites rotating jet and differenceThe multiple jet of spread pattern impacts the research of fluidised form and heat transfer effect. This experimental bench can be simulated respectivelyPlant jet impulse cooling, the experimental data of acquisition can be applied directly to impacts cooling research knotStructure design.
As shown in Figure 1, the evaluating apparatus of rotary impact jet Complex Flow Status and heat transfer effect, bagDraw together experimental stand 8, on four root posts of experimental stand 8, be provided with scale 14, experimental stand8 top cross beam places are provided with three-freedom mechanical arm 17, and experimental stand is provided with in the middle of 8 topsCollection chamber 1, collection chamber 1 import department is provided with reserved cigarette line and trace particle interface 3, forObservation directly perceived and the form of taking rotating jet flow field; Collection chamber 1 bottom connects surely by flangeDetermine straight length 4, stablize straight length 4 and be installed with jet nozzle 6 by nozzle jig 5;Jet nozzle 6 bottoms are provided with incubator 12.
Described experimental stand 8 surroundings are provided with protection plate washer 18.
Described collection chamber 1 inside is provided with current stabilization mesh screen 2, and current stabilization mesh screen 2 is by intersecting in length and breadthSheet metal form.
Described jet nozzle 6, it is saturating that its outlet is provided with the liftable of same level heightBright plate washer 7, the transparent plate washer 7 of liftable are installed on the liftable groove 13 of experimental stand 8 columnsOn; Be convenient to realize with nozzle face and keep concordant.
Described incubator 12 comprises the stacked target surface setting gradually 9, high temperature insulating plate 10 andInsulation material 11. Incubator 12 is installed on the liftable groove 13 of experimental stand 8 columns,Can move up and down, be convenient to adjust fluidic spaces size.
The transparent plate washer 7 of described liftable contacts with the column of experimental stand 8 with incubator 12Position is provided with tuning drive gear 14-1.
As shown in Figure 2, described stable straight length 4 is by end face flange 4-1 and nozzle jig5 axial lockings connect, and nozzle jig 5 is connected with jet nozzle 6 Peripheric lockings, rotationOn jet nozzle 6 and end face flange 4-1 contact-making surface, be provided with high-temperature resistant seal ring 4-2, airtightProperty is reliable, and easy accessibility, can install the jet nozzle 6 of different inner fluted structures.
Described target surface 9 is stainless steel metal thin slice, and surface is provided with meter font and arranges or arrayThe tracting pressuring hole 15-1 that formula is arranged, tracting pressuring hole 15-1 and thermocouple 16 intervals are arranged; 9 liang of target surfacesSide is provided with short circuit heating plate interface 9-1. As shown in Figure 3, on target surface, have that diameter 1mm's is pre-Stay tracting pressuring hole 15-1, pressure guiding pipe 15 adopts flexible metallic hose to be connected with target surface tracting pressuring hole 15-1,Layout scope recommended value is 3～5 times of experiment nozzle equivalent diameter, also can be according to requirement of experiment certainlyRow arranges, and thermocouple 16 arranges that scope recommended value is 8～10 times of experiment nozzle equivalent diameter,Also can arrange voluntarily according to requirement of experiment.
Described target surface 9 shapes include but not limited to plane, male and fomale(M&F), complex-curved and imitative whirlpoolThe difformity target surface of impeller blade leading edge.
As shown in Figure 4, be scale and the lower margin schematic diagram of experimental bench, this experimental stand, entiretyStructure is used four sides groove aluminium section bar, and each junction adopts L-type contiguous block to connect, vertical in surroundingPost is provided with nonadjustable signal 14, and precision is grade, meets requirement of experiment, liftableBright plate washer and target surface unit, four jiaos are all provided with tuning drive gear 14-1, and experimenter regulates requiredAfter the height of wanting, can read the distance of impulse nozzle to target surface according to pointer, consider transparent shelvesBetween plate 7 and target surface 9, have a large amount of impact air-flows and flow out, be provided with up and down in this region especiallyAdjustable transparency protected plate washer 18, can be convenient to observe like this, again can Protection personnel.Bottom is provided with four burr adjustable tail margins 26, to adapt to irregular ground, and can suitably raiseExperimental bench, so that heating cables, thermocouple, pressure guiding pipe pass from lower curtate.
Rotary impact jet Complex Flow Status based on said apparatus and the evaluation method of heat transfer effect,Step is:
Step 1, at jet nozzle 6 jets, testing the speed of hot-wire anemometer 22 is setProbe; In the parallel side of fluidic spaces, three dimensional particles imaging tachymeter 19 is set, three certainlyBy being separately installed with thermal infrared imager 21, dipulse YAG laser generator on degree mechanical arm 1720, on target surface 9, post the detection paster of heat flow density instrument 23; Short circuit heating plate interface 9-1Connect short circuit heater 24; Collection chamber 1 is provided with pressure-measuring pipe 15 and thermocouple with target surface 916, the data obtained is all connected to data collecting system 25;
Step 2, cooling medium enter collection chamber 1, steady by entering after current stabilization mesh screen 2 current stabilizationsDetermine straight length 4 and after jet nozzle 6 excites, produce rotating jet and rush at target surface 9, pass throughThe transparent plate washer 7 of liftable retrains fluidic spaces, by adjusting the Level Change of incubator 12The distance of fluidic spaces, the jet nozzle 6 of nozzle jig 5 replaceable different structures;
The probe measurement jet nozzle 6 that tests the speed of step 3, hot-wire anemometer 22 is worked off one's feeling vent one's spleenFluctuation velocity, frequency and the turbulence level of stream; Add by reserved cigarette line and trace particle interface 3Trace particle (small nonmetal nanoscale fluorescent grain) coordinates three dimensional particles imaging tachymeter19 and dipulse YAG laser generator 20, can capture a pair of 2048x2048 resolution ratioFlow field figure picture, by flow field figure picture can quantitative given fluidic spaces in the three-dimensional velocity of jet, and then the Vorticity Field of the complicated eddy structure of definite jet, thereby announcement complex rotation jetComplicated flow pattern and Evolution thereof; Measure the static pressure of target surface by the pressure-measuring pipe 15 on target surface 9Distribute, the Intensity Design of impacting the mechanical property of target surface for rotating jet provides basic data. AdoptMeasure target surface temperature with thermocouple 16, adopt thermal infrared imager 21 to measure the temperature of target surface simultaneously, the temperature of thermocouple measurement can further be revised thermal infrared imager 21 and measure acquisition like thisTemperature field, this point-field is in conjunction with metering system, temperature that can Accurate Determining target surface. WithHeat flow density instrument is directly measured the actual heat flow density of target surface, thereby does not need to adopt the reason of simplifyingOpinion formula goes to estimate that the heat loss of target surface (is radiated to the heat of ambient outside environment and conducts the end of toThe heat of portion's thermal insulation board). Control target surface by regulating short circuit heater 24 current/voltage sizes9 heat flow densities;
Step 4, use heat flow density instrument 23 are measured the heat flow density q of target surface 9 reality, targetThe coefficient of heat transfer of face 9 is: h=q/ (Tw-T0), T in formulawFor target surface temperature, T0Collection chamber is coolingMedium temperature. The theoretical heat flow density q of target surface0(W/m2),q0=IU/A is by target surface short circuitHeater current I takes advantage of the voltage U at target surface two ends to draw, can accurately provide different working conditionsUnder apparatus system heat waste rate, overcome existing apparatus and can only estimate in experiment that heat loss is notFoot, thus determine more exactly the cooling effect of rotating jet.
The present invention includes but be not limited to above-mentioned detailed description of the invention, persons skilled in the art rootAccording to content disclosed by the invention, can adopt other multiple detailed description of the invention to implement the present invention,Therefore, every employing project organization of the present invention and thought, do some simple variations and changeDesign, all fall into the scope of protection of the invention.
Claims (10)
1. an evaluating apparatus for rotary impact jet Complex Flow Status and heat transfer effect, its featureBe, comprise experimental stand (8), on four root posts of experimental stand (8), be provided with markChi (14), experimental stand (8) top cross beam place is provided with three-freedom mechanical arm (17),In the middle of experimental stand (8) top, be provided with collection chamber (1), collection chamber (1) import department arrangesHave reserved cigarette line and trace particle interface (3), collection chamber (1) bottom connects surely by flangeDetermine straight length (4), stablize straight length (4) and be installed with rotating jet by nozzle jig (5)Nozzle (6); Jet nozzle (6) bottom is provided with incubator (12).
2. a kind of rotary impact jet Complex Flow Status according to claim 1 and heat exchange effectThe evaluating apparatus of fruit, is characterized in that, described experimental stand (8) surrounding is provided with protectionPlate washer (18).
3. a kind of rotary impact jet Complex Flow Status according to claim 1 and heat exchange effectThe evaluating apparatus of fruit, is characterized in that, described collection chamber (1) inside is provided with current stabilization netSieve (2), current stabilization mesh screen (2) is made up of the sheet metal intersecting in length and breadth.
4. a kind of rotary impact jet Complex Flow Status according to claim 1 and heat exchange effectThe evaluating apparatus of fruit, is characterized in that, described jet nozzle (6), and it exports settingThere is the transparent plate washer of liftable (7) of same level height, the transparent plate washer of liftable (7) two endsBe installed on the liftable groove (13) of experimental stand (8) column.
5. a kind of rotary impact jet Complex Flow Status according to claim 1 and heat exchange effectThe evaluating apparatus of fruit, is characterized in that, described stable straight length (4) is by end face flange(4-1) be connected nozzle jig (5) and rotating jet with nozzle jig (5) axial lockingNozzle (6) Peripheric locking connects, and jet nozzle (6) connects with end face flange (4-1)On the face of touching, be provided with high-temperature resistant seal ring (4-2).
6. a kind of rotary impact jet Complex Flow Status according to claim 1 and heat exchange effectThe evaluating apparatus of fruit, is characterized in that, described incubator (12) comprises stacked setting graduallyTarget surface (9), high temperature insulating plate (10) and insulation material (11), incubator (12) peaceBe loaded on the liftable groove (13) of experimental stand (8) column.
7. a kind of rotary impact jet Complex Flow Status according to claim 1 and heat exchange effectThe evaluating apparatus of fruit, is characterized in that, described target surface (9) is stainless steel metal thin slice,Surface is provided with the tracting pressuring hole (15-1) that meter font is arranged or array is arranged, tracting pressuring hole (15-1)Arrange with thermocouple (16) interval; Target surface (9) both sides are provided with short circuit heating plate interface (9-1).
8. according to a kind of rotary impact jet Complex Flow Status described in claim 1 or 7 and changeThe evaluating apparatus of thermal effect, is characterized in that, described target surface (9) shape comprise plane,Male and fomale(M&F) and arc surface.
9. a kind of rotary impact jet Complex Flow Status according to claim 1 and heat exchange effectThe evaluating apparatus of fruit, is characterized in that the transparent plate washer of described liftable (7) and incubator(12) be provided with tuning drive gear (14-1) with the column contact position of experimental stand (8).
10. the rotary impact based on installing described in claim 1-9 any one claim is penetratedThe evaluation method of stream Complex Flow Status and heat transfer effect, is characterized in that, step is:
Step 1, at jet nozzle (6) jet, hot-wire anemometer (22) is setThe probe that tests the speed; In the parallel side of fluidic spaces, three dimensional particles imaging tachymeter (19) is set,In three-freedom mechanical arm (17), be separately installed with thermal infrared imager (21), dipulse YAGLaser generator (20) posts the detection paster of heat flow density instrument (23) on target surface (9);Short circuit heating plate interface (9-1) connects short circuit heater (24); Collection chamber (1) and target surface(9) be provided with pressure-measuring pipe (15) and thermocouple (16); The data obtained is all connected to dataAcquisition system (25);
Step 2, cooling medium enter collection chamber (1), after current stabilization mesh screen (2) current stabilizationEntering stable straight length (4) generation rotating jet after jet nozzle (6) excites rushes atTarget surface (9), retrains fluidic spaces by the transparent plate washer of liftable (7), protects by adjustmentThe distance of the Level Change fluidic spaces of incubator (12), the replaceable difference of nozzle jig (5)The jet nozzle 6 of structure;
The probe measurement jet nozzle (6) that tests the speed of step 3, hot-wire anemometer (22)Fluctuation velocity, frequency and the turbulence level of exit flow; By reserved cigarette line and trace particle interface(3) add trace particle to coordinate three dimensional particles imaging tachymeter (19) and dipulse YAG to swashOptical generator (20), can capture the flow field figure picture of a pair of 2048x2048 resolution ratio, byFlow field figure picture can quantitative given fluidic spaces in the 3D velocity field of jet, and then definite jetThe Vorticity Field of complicated eddy structure, thereby the complicated flow pattern and the evolution thereof that disclose complex rotation jetRule; Measure the static pressure distribution of target surface by the pressure-measuring pipe (15) on target surface (9); AdoptThermocouple (16) is measured target surface temperature, adopts thermal infrared imager (21) to measure target surface simultaneouslyTemperature field, the temperature of thermocouple measurement can further be revised thermal infrared imager (21) survey like thisThe temperature field that amount obtains; Control target by regulating short circuit heater (24) current/voltage sizeFace (9) heat flow density;
Step 4, use heat flow density instrument (23) are measured the actual heat flow density q of target surface (9),The coefficient of heat transfer of target surface (9) is: h=q/ (Tw-T0), T in formulawFor target surface temperature, T0Gas collectionChamber coolant temperature, the theoretical heat flow density q of target surface0(W/m2),q0=IU/A is by targetFace short circuit heater current I takes advantage of the voltage U at target surface two ends to draw, accurately draws different operating mode barsApparatus system heat waste rate under part.
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