CN107179206A - One kind crossing current wet cooling tower drag characteristic experimental rig and method of testing - Google Patents
One kind crossing current wet cooling tower drag characteristic experimental rig and method of testing Download PDFInfo
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- CN107179206A CN107179206A CN201710481635.1A CN201710481635A CN107179206A CN 107179206 A CN107179206 A CN 107179206A CN 201710481635 A CN201710481635 A CN 201710481635A CN 107179206 A CN107179206 A CN 107179206A
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Abstract
One kind crossing current wet cooling tower drag characteristic experimental rig and method of testing, experimental rig includes liftable test platform, model tower, frequency conversion fan and corresponding ventilation shaft, wherein model tower includes packing analog board, packing top closing plate, tower, tower pillar and voltage stabilizing straight length, space between tower and test platform forms air inlet, packing analog board is arranged on test platform and is arranged on around air inlet, uniformly air vent is offered on packing analog board, voltage stabilizing straight length is arranged on the top of tower, the first ventilation shaft is provided with the top of voltage stabilizing straight length, first ventilation shaft is connected with the second ventilation shaft, tower, voltage stabilizing straight length, first ventilation shaft and the second ventilation shaft are connected.Model tower of the present invention meets similarity law, and the law of airflow that can reflect in industrial cooling tower instructs the Optimal Structure Designing of commercial Application cooling tower.
Description
Technical field
The invention belongs to cooling tower drag characteristic experiment field, and in particular to one kind crossing current wet cooling tower drag characteristic examination
Experiment device and method of testing, the accurate calculating for instructing large-scale crossing current wet cooling tower resistance is large-scale crossing current wet type cooling
The structural dimension optimization of tower provides foundation.
Background technology
Cooling tower is widely used in many departments of national economy, such as electric power, oil, chemical industry and steel, and its effect is
By the cooling water for carrying under one's arms used heat in Ta Nei and air progress heat exchange, used heat is transferred to air and spill into air.Cooling tower is pressed
The flow direction of hot water and air can be divided into counterflow cooling tower and cross flow cooling tower.At present, the heating power of counterflow cooling tower
Drag characteristic research is more ripe.As China is increasing in the thermoelectric generator pool-size built, reverse-flow gravity-flow ventilation is cold
But tower is by spray density is small and the excessively high limitation of tower is influenceed to become increasingly conspicuous, the reverse-flow nature of million grades of part unit adapted
Ventilating and cooling tower height degree has exceeded the regulating scope of Structure Calculation.Cross-flow type cooling stack exchange capability of heat is less than reverse-flow
Cooling tower, but still with spray density is big, flowing resistance is small, tower physical dimension is small, reduced investment, the characteristics of noise is low, is available for
The selection of electric power large sized unit is on probation.The design of cross-flow type cooling stack is studied, and applied to engineering practice, is realized big
The type selecting variation of the cooling stack of capacity unit adapted is necessary.
Large-scale crossing current wet cooling tower is by air inlet shutter, packing, water distribution system, dehydrater, air inlet, tower
Pillar and tower etc. are constituted, and the research of its drag characteristic needs to complete by model resistance attribute testing, and passes through each several part resistance
The superimposed drag characteristic to assess cooling tower of attribute testing effect, have ignored influencing each other between each several part, it is impossible to true
Reflection cooling tower actual conditions.By similarity rules, design large-scale crossing current wet cooling tower drag characteristic experimental rig and use
In research cooling tower drag characteristic and influence factor be feasible research method.Avoid simultaneously and industrial cooling tower is carried out in fact
Quantities is big during survey, data not Easy Test is accurate, can not studying cooling tower, each part dimension changes to cooling tower resistance coefficient shadow
Loud variation relation problem.
The content of the invention
It is an object of the invention to provide one kind crossing current wet cooling tower drag characteristic experimental rig and method of testing, the dress
Put the change rule that can study cooling tower drag characteristic with air intake open height, packing resistance coefficient, packing shrouding angle
Rule, the structure design for instructing large-scale crossing current wet cooling tower.
In order to achieve the above object, the technical solution adopted by the present invention is：
One kind crossing current wet cooling tower drag characteristic experimental rig, including model tower, liftable test platform, the first ventilation
Pipeline and the second ventilation shaft；Model tower includes packing analog board, packing top closing plate, tower, tower pillar
And voltage stabilizing straight length, tower is arranged on test platform by tower pillar, and the space between tower and test platform
Air inlet is formed, packing analog board is arranged on test platform and is arranged on around air inlet, packing simulation
Uniform on plate to offer air vent, packing top closing plate one end is arranged at the top of packing analog board, the other end and tower
Cylinder bottom is connected, and voltage stabilizing straight length, which is arranged at the top of the top of tower, voltage stabilizing straight length, is provided with the first ventilation shaft, and first leads to
Wind pipeline is connected with the second ventilation shaft, and tower, voltage stabilizing straight length, the first ventilation shaft and the second ventilation shaft are connected.
Further improve of the invention is that test platform bottom is additionally provided with the lowering or hoisting gear for controlling its height.
Further improve of the invention is that the angle of packing top closing plate and horizontal plane is 10~25 °, and to
It is upper to tilt.
Further improve of the invention is, airflow direction is provided with fairing and frequency conversion wind in the second ventilation shaft
Machine.
Further improve of the invention is that packing analog board is made up of poly (methyl methacrylate) plate；Tower is in hyperbola,
Material is lucite；The first measurement that different height is provided with for measuring wind speed and pressure in tower and voltage stabilizing straight length is cut
Face, the second measurement section, the 3rd measurement section, the 4th measurement section, four equidistant radius sides on each measurement section
L-type Pitot tube or hot-wire anemometer are put into offering in four measured holes, the measured hole on each radial direction.
Further improve of the invention is that the first measurement section is located at the position of the cross section of tower bottom, and second surveys
The position that section is located at cross section in tower is measured, the 3rd measurement section is located at the position of voltage stabilizing straight length bottom cross section, the
Four measurement sections are located at the position of cross section in voltage stabilizing straight length.
One kind crossing current wet cooling tower drag characteristic method of testing, including packing analog board resistance coefficient really
The test of wind speed profile, the test of air inlet region resistance and the test of air inlet region resistance coefficient in fixed, tower, specifically such as
Under：
1) different height, different pore size, the determination of the resistance coefficient of the circular ring type packing analog board of pitch of holes：
Simulation calculating is carried out to the resistance coefficient of different pore size, the flat board of pitch of holes by method for numerical simulation, institute is obtained
The aperture of the packing analog board needed and pitch of holes, according between the open pore size of the flat board of obtained different resistance coefficients and hole
Away from manufacture is processed to annular packing analog board, the packing analog board of corresponding resistance coefficient is obtained；
2) in tower wind speed profile test：
The distance between tower and test platform are adjusted, to determine air intake open height, air intake open height there are four kinds, right respectively
The cross-sectional area ratio for answering air-admitting surface and tower bottom is 0.7,0.8,0.9 and 1.0；Utilize obtained different resistances
The packing analog board of coefficient, it is determined that the resistance coefficient of packing analog board simulated is needed, packing analog board
Resistance coefficient is divided into four kinds, is 15,25,35 and 45 respectively；The air quantity of frequency conversion fan is adjusted, makes to reach stable gas in model tower
Flow service condition；The the first measurement section, the second measurement section, the 3rd measurement that hot-wire anemometer is sequentially inserted into model tower are cut
In face, the measured hole in the 4th measurement section, encapsulation process will be done around tested measured hole in test process, remaining survey
Metering-orifice does encapsulation process, completes the test to tower different height and voltage stabilizing straight length diverse location wind speed；
3) test of air inlet region resistance：The step Adjustment Tests operating mode tested using wind speed in tower, in tower and surely
3rd measurement section arrangement pressure testing point of the junction of straightening pipeline section, measures the orthogonal radius in four, section the 3rd respectively
Direction is tested, each radius according to etc. face ring method arrange five test points；The pressure value of test correspondence test point, with
The arithmetic mean of instantaneous value of the pressure value everywhere of test as cooling tower exit pressure value, while measuring atmospheric pressure value and at that time
The difference of the pressure value in environment temperature, atmospheric pressure value and cooling tower exit is the Resistance Value in air inlet region；
4) test of air inlet region resistance coefficient：
The wind speed that cooling tower resistance coefficient is used in calculating is the sectional wind velocity of packing, according to the horizontal stroke of voltage stabilizing straight length
Wind speed at the area in section and the 4th measurement section is calculated at packing analog board by the equal method of ventilation
Sectional wind velocity：
Simulated according to the Resistance Value in the model tower air inlet region tested, environment temperature, atmospheric pressure and packing
The wind speed of plate section part carries out the calculating of air inlet region resistance coefficient：
The total drag coefficients of model tower are the resistance coefficient in air inlet region and the resistance coefficient sum of air outlet.
Of the invention further improve be, step 3) in using the step Adjustment Tests operating mode of wind speed test in tower tool
Body process is：When air intake open height correspondence air-admitting surface and the cross-sectional area ratio of tower bottom are 0.7, packing
The resistance coefficient of analog board is divided into four kinds, is 15,25,35 and 45 respectively；Wind speed profile in tower under four kinds of resistance coefficients of measurement；
When air intake open height correspondence air-admitting surface and the cross-sectional area ratio of tower bottom are 0.8, packing analog board
Resistance coefficient is divided into four kinds, is 15,25,35 and 45 respectively；Wind speed profile in tower under four kinds of resistance coefficients of measurement；Work as air inlet
When highly correspondence air-admitting surface and the cross-sectional area ratio of tower bottom are 0.9, the resistance coefficient of packing analog board
It is divided into four kinds, is 15,25,35 and 45 respectively；Wind speed profile in tower under four kinds of resistance coefficients of measurement；When air intake open height correspondence
When the cross-sectional area ratio of air-admitting surface and tower bottom is 1.0, the resistance coefficient of packing analog board is divided into four kinds,
It is 15,25,35,45 respectively；Wind speed profile in tower under four kinds of resistance coefficients of measurement.
Of the invention further improve be, step 3) in air inlet region Resistance Value calculation formula it is as follows：
In formula：The Resistance Value in Δ P-air inlet region, Pa；
P0- atmospheric pressure value, Pa；
N-test point sum；
PiThe corresponding pressure value of test point, Pa at-the three measurement section.
Of the invention further improve be, step 4) in sectional wind velocity at packing analog board calculation formula
For：
In formula：The sectional wind velocity of V-packing analog board, m/s；
A1The air-admitting surface of-packing analog board, m2；
The area of the cross section of A-voltage stabilizing straight length；
N-test point sum；
ViThe corresponding air speed value of test point, m/s in-the four measurement section；
Step 4) in the calculation formula of air inlet region resistance coefficient be：
In formula：ξ1The resistance coefficient in-air inlet region；
ρ-obtained atmospheric density, kg/m are calculated by measurement condition atmospheric pressure and environment temperature3；
The sectional wind velocity of V-packing analog board, m/s；
The total drag coefficients ξ of model tower is calculated by equation below：
In formula：ξ1The resistance coefficient in-air inlet region；
α-air outlet velocity nonuniformity coefficient, and α is 1；
A2The area of the air outlet of-model tower, m2；
A1The air-admitting surface of-packing analog board, m2；
The total drag coefficients of ξ-model tower.
Compared with prior art, the device have the advantages that：Model tower of the present invention meets similarity law, process of the test
Wind speed reaches the requirement of region of quadratic resistance law in middle tower, the law of airflow that can reflect in industrial cooling tower, devises model examination
Experiment device and method of testing, can need wind speed, air intake open height, packing resistance coefficient, water drenching in adjustment tower according to test
Filler shrouding angle of inclination etc. influence crossing current wet cooling tower drag characteristic influence factor, result of the test contain each part it
Between influence each other, test result is more reasonable.The method strong operability, it is to avoid resistance performance is carried out to cooling tower single part
Test and ignore the interactional factor between cooling tower parts, while avoiding quantities when being surveyed to industrial cooling tower
Greatly, data not Easy Test is accurate, can not studying cooling tower, each part dimension change is closed on the change that cooling tower resistance coefficient influences
It is problem.
Further, mesa base surrounding also has the lowering or hoisting gear for controlling its height, disclosure satisfy that different air intake open heights
Requirement.
The numerical simulation calculation packing analog board resistance coefficient that the present invention is used determines its aperture and the side of pitch of holes
Method avoids the blindness of packing analog board perforate.The present invention to influence flow over wet cooling tower resistance coefficient influence because
Plain (air intake open height, packing top closing plate angle and packing analog board resistance coefficient) gives adjusting method and tune
Parameter area is saved, available for research crossing current wet cooling tower drag characteristic with cooling tower air intake open height, packing shrouding angle
The variation relation of degree and packing resistance coefficient, instructs the Optimal Structure Designing of commercial Application cooling tower.
Brief description of the drawings
Fig. 1 is the overall structure diagram of the present invention.
Fig. 2 is the structural representation of packing analog board of the present invention.
Fig. 3 is the schematic diagram of cross sectional testing position of the present invention.
Fig. 4 is the test point on the 3rd measurement section.
Fig. 5 is the test point on the first measurement section.
In figure, 1 is test platform, and 2 be packing analog board, and 3 be packing top closing plate, and 4 be tower pillar, 5
It is tower for tower bottom, 6,7 be voltage stabilizing straight length, and 8 be the first ventilation shaft, and 9 be the second ventilation shaft, and 10 be that rectification is filled
Put, 11 be frequency conversion fan, and 12 be model tower, and 13 be lowering or hoisting gear, and 14 be air vent, and 15 be the first measurement section, and 16 be second
Section is measured, 17 be the 3rd measurement section, and 18 be the 4th measurement section, and 19 be test point.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
Referring to Fig. 1, large-scale crossing current wet cooling tower drag characteristic experimental rig of the invention includes model tower 12, liftable
Test platform 1, frequency conversion fan 11 and corresponding first ventilation shaft 8, the second ventilation shaft 9.Model tower 12 includes packing mould
Intend plate 2, packing top closing plate 3, tower 6, tower pillar 4 and voltage stabilizing straight length 7.Tower 6 is set by tower pillar 4
On test platform 1, and space between tower 6 and test platform forms air inlet, and packing analog board 2 is arranged in tower
Around cylinder bottom air inlet mouthful, circumferentially, i.e., one is set to enclose packing analog board 2 in the outside of tower 6；The water drenching is filled out
Material top closing plate is the connection member for connecting packing analog board and tower with certain angle of inclination.Referring to Fig. 2, water drenching
Air vent 14 uniformly is offered on filler analog board 2, packing analog board 2 is made up of poly (methyl methacrylate) plate, in order to simulate difference
Highly, four kinds of the height point of packing analog board 2 in the packing of different depth, the present invention；For the pouring of every kind of height
Water packing analog board 2, by changing aperture and the pitch of holes of air vent 14, the resistance coefficient of packing analog board 2 also divides four
Kind.Packing analog board 2 is also disposed on liftable test platform 1, and liftable test platform 1 is the behaviour with certain area
Make platform, bolster model tower 12 is played on its top, test platform bottom surrounding is additionally provided with the liter for controlling its height
Falling unit 13, for meeting the requirement of different air intake open heights.The top of packing analog board 2 is packing top closing plate 3.
The one end of packing top closing plate 3 is arranged on the top of packing analog board 2, and the other end is connected with tower bottom 5, packing
Top closing plate 3 is pouring in the connection member for connecting packing analog board 2 and tower 6 with certain angle of inclination, the present invention
The angle of inclination of water packing top closing plate 3 is 10~25 ° of upward oblique towers 6.Tower pillar 4 is circumferentially positioned at the bottom of tower 6.
Voltage stabilizing straight length 7 is located at the top of tower 6.The top of voltage stabilizing straight length 7 is provided with the first ventilation being connected with voltage stabilizing straight length 7
Pipeline 8, the first ventilation shaft 8 is connected with the second ventilation shaft 9, the second ventilation shaft 9 and airflow direction is provided with rectification dress
Put 10 and frequency conversion fan 11；Frequency conversion fan 11 and corresponding first ventilation shaft 8, the second ventilation shaft 9 are used for meeting model tower 12
Requirement to wind speed and steady air flow.
Referring to Fig. 3, Fig. 4 and Fig. 5, tower 6 is in hyperbola, is contracted by industrial cooling tower prototype according to principle of similitude equal proportion
Little makings, material is lucite.Voltage stabilizing straight length 7 is located between the ventilation shaft 8 of tower 6 and first.Tower 6 and voltage stabilizing straight tube
Different height is provided with for measuring wind speed, the first measurement section 15, second measurement section 16 of pressure, the 3rd measurement in section 7
Section the 17, the 4th measures section 18, and four equidistant radial directions offer 4 measured holes on each measurement section,
Measured hole is opened up on the barrel of tower 6 and constant voltage DC section 7, L-type skin is inserted in the measured hole on each radial direction
Trustship, for test pressure, or insertion hot-wire anemometer, for testing wind speed.
Specifically, the first measurement section 15 is located at the position of the bottom cross section of tower 6, the second measurement section 16 is located at tower
The position of cross section in cylinder 6, the 3rd measurement section 17 is located at the position of the bottom cross section of voltage stabilizing straight length 7, and the 4th measurement is cut
Face 18 is located at the position of cross section in voltage stabilizing straight length 7.
Large-scale crossing current wet cooling tower drag characteristic method of testing of the invention based on above-mentioned experimental rig, including water drenching are filled out
Expect the determination of resistance coefficient of analog board 2, the test of wind speed profile, the test of air inlet region resistance and air inlet region in tower
The test of resistance coefficient, it is specific as follows：
1) different height, different pore size, the determination of the resistance coefficient of the circular ring type packing analog board 2 of pitch of holes.Its
Step is as follows：Simulation calculating is carried out to the resistance coefficient of different pore size, the flat board of pitch of holes by method for numerical simulation, institute is obtained
The aperture of the packing analog board 2 needed and pitch of holes.Sector-style is entered to obtained different pore size, the flat-plate drag coefficient of pitch of holes
Hole laboratory is surveyed, to verify the correctness of method for numerical simulation, according to opening for the flat board for simulating obtained different resistance coefficients
Hole aperture and pitch of holes are processed manufacture to annular packing analog board 2, that is, obtain the packing of corresponding resistance coefficient
Analog board.This approach avoid the blindness of packing analog board perforate.
2) in tower wind speed profile test, its step is as follows：It is flat using the adjustment tower 6 of liftable test platform 1 and experiment
The distance between platform 1, to determine air intake open height, the physical dimension of the actual cooling tower of foundation industry in the present invention, air inlet
Highly there are four kinds, air-admitting surface and cross section (i.e. the cross section of tower bottom surface) area ratio of tower bottom 5 are corresponded to respectively
For 0.7,0.8,0.9,1.0；Using the packing analog board 2 of obtained different resistance coefficients, it is determined that needing the water drenching simulated
The resistance coefficient of filler analog board 2, the physical dimension and drag characteristic of the actual cooling tower of foundation industry in the present invention, water drenching is filled out
The resistance coefficient of material analog board 2 is divided into four kinds, is 15,25,35,45 respectively；Adjust between packing analog board 2 and tower 6
The angle of packing top closing plate 3, to determine the angle of inclination of packing shrouding 3, in the present invention at the top of packing
The angle of inclination adjustable range of shrouding 3 is 10~25 °；The air quantity of frequency conversion fan 11 is adjusted, makes to reach stable gas in model tower 12
Flow service condition.Hot-wire anemometer is sequentially inserted into the first measurement section 15, second measurement section 16, the 3rd survey of model tower 12
In the measured hole for measuring the measurement section 18 of section the 17, the 4th, encapsulation process will be done around tested measured hole in test process,
Remaining measured hole does encapsulation process, completes the test to the different height of tower 6 and the diverse location wind speed of voltage stabilizing straight length 7,
Each measurement section is tested in four orthogonal radial directions respectively in the present invention, each radius according to etc. face ring method
Arrange five test points 19.
3) test of air inlet region resistance：Using the step Adjustment Tests operating mode of wind speed test in tower, detailed process is：
When air intake open height correspondence air-admitting surface and the cross-sectional area ratio of tower bottom 5 are 0.7, packing analog board 2
Resistance coefficient be divided into four kinds, be 15,25,35,45 respectively；Wind speed profile in tower under four kinds of resistance coefficients of measurement；Work as air inlet
When highly correspondence air-admitting surface and the cross-sectional area ratio of tower bottom 5 are 0.8, the resistance system of packing analog board 2
Number is divided into four kinds, is 15,25,35,45 respectively；Wind speed profile in tower under four kinds of resistance coefficients of measurement；When air intake open height correspondence
When the cross-sectional area ratio of air-admitting surface and tower bottom 5 is 0.9, the resistance coefficient of packing analog board 2 is divided into four
Kind, it is 15,25,35,45 respectively；Wind speed profile in tower under four kinds of resistance coefficients of measurement；When air intake open height correspondence air inlet face
When the cross-sectional area ratio of product and tower bottom 5 is 1.0, the resistance coefficient of packing analog board 2 is divided into four kinds, is respectively
15、25、35、45；Wind speed profile in tower under four kinds of resistance coefficients of measurement.
The 3rd measurement section 17 arrangement pressure testing point in tower 6 and the junction of voltage stabilizing straight length 7, respectively the 3rd
Measurement the orthogonal radial direction in 17 4, section tested, each radius according to etc. face ring method arrangement test point 19 5
It is individual.The pressure value of test correspondence test point 19, cooling tower exit is used as using the arithmetic mean of instantaneous value of the pressure value everywhere of test
Pressure value, while atmospheric pressure value and prevailing circumstances temperature are measured, the difference of the pressure value in atmospheric pressure value and cooling tower exit
That is the Resistance Value in air inlet region, its calculation formula is as follows：
In formula：The Resistance Value in Δ P-air inlet region, Pa；
P0- atmospheric pressure value, Pa；
It is the test point sum at the 3rd measurement section 17 in n-test point sum, the present embodiment, four radial directions are total to
20；
PiThe corresponding pressure value of test point, Pa at-the three measurement section 17.
4) test of air inlet region resistance coefficient, its step is as follows：The wind speed that cooling tower resistance coefficient is used in calculating
For the sectional wind velocity of packing, according to the cross-sectional area (area in the i.e. the 4th measurement section 18) of voltage stabilizing straight length 7 and the 4th
Wind speed at measurement section 18 calculates sectional wind velocity at packing analog board 2 by the equal method of ventilation, calculates
Formula is as follows：
In formula：Sectional wind velocity at V-packing analog board 2, m/s；
A1Air-admitting surface at-packing analog board 2, m2；
It is the area in the 4th measurement section 18, m in the area of cross section at A-voltage stabilizing straight length 7, the present embodiment2；
It is the test point sum at the 4th measurement section 18 in n-test point sum, the present embodiment, four radial directions are total to
20；
ViThe corresponding air speed value of test point, m/s in-the four measurement section 18.
According to Resistance Value, environment temperature, atmospheric pressure and the packing section in the model tower air inlet region tested
The wind speed at place can carry out the calculating of air inlet region resistance coefficient, and its calculation formula is as follows：
In formula：ξ1The resistance coefficient in-air inlet region；
ρ-obtained atmospheric density, kg/m are calculated by measurement condition atmospheric pressure and environment temperature3；
Sectional wind velocity at V-packing analog board 2, m/s；
The total drag coefficients of model tower can be counted by the resistance coefficient in air inlet region and the resistance coefficient sum of air outlet
Calculate, formula is as follows：
In formula：ξ1The resistance coefficient in-air inlet region；
α-air outlet velocity nonuniformity coefficient, is typically taken as 1；
A2The air outlet of-model tower is the area in the 3rd measurement section 17, m2；
A1Air-admitting surface at-packing analog board 2, m2；
The total drag coefficients of ξ-model tower.
Model tower of the present invention meets in similarity law, process of the test that wind speed reaches region of quadratic resistance law in tower, can reflect industry
The law of airflow in cooling tower, devises model test apparatus and method of testing, and wind in adjustment tower can be needed according to test
The influence such as speed, air intake open height, packing resistance coefficient, packing shrouding angle of inclination crossing current wet cooling tower resistance is special
The influence factor of property, result of the test contains influencing each other between each part, and test result is more reasonable.The method operability
By force, it is to avoid resistance performance test is carried out cooling tower single part and the interactional factor ignoring cooling tower parts,
While avoiding, quantities when being surveyed to industrial cooling tower is big, data not Easy Test is accurate, can not study each portion of cooling tower
The problem of variation relation that part change in size influences on cooling tower resistance coefficient.
The present invention can be used for research crossing current wet cooling tower drag characteristic with cooling tower air intake open height, packing shrouding
The variation relation of angle and packing resistance coefficient, instructs the Optimal Structure Designing of commercial Application cooling tower.
Claims (10)
1. one kind crossing current wet cooling tower drag characteristic experimental rig, it is characterised in that tested including model tower (12), liftable
Platform (1), the first ventilation shaft (8) and the second ventilation shaft (9)；Model tower (12) includes packing analog board (2), drenched
Water packing top closing plate (3), tower (6), tower pillar (4) and voltage stabilizing straight length (7), tower (6) pass through tower pillar (4)
It is arranged on test platform (1), and the space between tower (6) and test platform (1) forms air inlet, packing simulation
Plate (2) is arranged on test platform (1) and is arranged on around air inlet, and packing analog board is uniformly offered on (2)
Air vent (14), packing top closing plate (3) one end is arranged at the top of packing analog board (2), the other end and tower bottom
Portion (5) is connected, and voltage stabilizing straight length (7) is arranged at the top of the top of tower (6), voltage stabilizing straight length (7) and is provided with the first ventilation duct
Road (8), the first ventilation shaft (8) is connected with the second ventilation shaft (9), tower (6), voltage stabilizing straight length (7), the first ventilation shaft
And the second ventilation shaft (9) is connected (8).
2. a kind of crossing current wet cooling tower drag characteristic experimental rig according to claim 1, it is characterised in that experiment is flat
Platform (1) bottom surrounding is additionally provided with the lowering or hoisting gear (13) for controlling its height.
3. a kind of crossing current wet cooling tower drag characteristic experimental rig according to claim 1, it is characterised in that water drenching is filled out
The angle for expecting top closing plate (3) and horizontal plane is 10~25 °, and is inclined upwardly.
4. a kind of crossing current wet cooling tower drag characteristic experimental rig according to claim 1, it is characterised in that second leads to
Airflow direction is provided with fairing (10) and frequency conversion fan (11) in wind pipeline (9).
5. a kind of crossing current wet cooling tower drag characteristic experimental rig according to claim 1, it is characterised in that water drenching is filled out
Material analog board (2) is made up of poly (methyl methacrylate) plate；Tower (6) is in hyperbola, and material is lucite；Tower (6) and voltage stabilizing are straight
Pipeline section (7) interior different height be provided with for measure wind speed and pressure first measurement section (15), second measurement section (16),
3rd measurement section (17), the 4th measurement section (18), four equidistant radial directions are opened up on each measurement section
Have in four measured holes, the measured hole on each radial direction and be put into L-type Pitot tube or hot-wire anemometer.
6. a kind of crossing current wet cooling tower drag characteristic experimental rig according to claim 5, it is characterised in that first surveys
The position that section (15) are located at the cross section of tower bottom (5) is measured, the second measurement section (16) is located at cross section in tower (6)
Position, the 3rd measurement section (17) be located at voltage stabilizing straight length (7) bottom cross section position, the 4th measurement section (18) is located at
The position of cross section in voltage stabilizing straight length (7).
7. one kind crossing current wet cooling tower drag characteristic method of testing, it is characterised in that include the resistance of packing analog board (2)
The test of wind speed profile, the test of air inlet region resistance and the survey of air inlet region resistance coefficient in the determination of force coefficient, tower
Examination, it is specific as follows：
1) different height, different pore size, the determination of the resistance coefficient of the circular ring type packing analog board (2) of pitch of holes：
Simulation calculating is carried out to the resistance coefficient of different pore size, the flat board of pitch of holes by method for numerical simulation, needed for obtaining
The aperture of packing analog board (2) and pitch of holes, according between the open pore size of the flat board of obtained different resistance coefficients and hole
Away from manufacture is processed to annular packing analog board (2), the packing analog board of corresponding resistance coefficient is obtained；
2) in tower wind speed profile test：
The distance between tower (6) and test platform (1) are adjusted, to determine air intake open height, air intake open height there are four kinds, respectively
The cross-sectional area ratio of correspondence air-admitting surface and tower bottom (5) is 0.7,0.8,0.9 and 1.0；Using obtaining not
With the packing analog board (2) of resistance coefficient, it is determined that needing the resistance coefficient of packing analog board 2 simulated, water drenching is filled out
The resistance coefficient of material analog board (2) is divided into four kinds, is 15,25,35 and 45 respectively；The air quantity of frequency conversion fan (11) is adjusted, is made
Steady air flow service condition is reached in model tower (12)；Hot-wire anemometer is sequentially inserted into the first measurement section of model tower (12)
(15), in the second measurement section (16), the 3rd measurement section (17), the measured hole of the 4th measurement section (18), in test process
Middle to do encapsulation process around tested measured hole, remaining measured hole does encapsulation process, completes to tower (6) different height
With the test of voltage stabilizing straight length (7) diverse location wind speed；
3) test of air inlet region resistance：The step Adjustment Tests operating mode tested using wind speed in tower, in tower (6) and voltage stabilizing
3rd measurement section (17) arrangement pressure testing point of the junction of straight length (7), measures (17) four, section the 3rd respectively
Orthogonal radial direction is tested, each radius according to etc. face ring method arrange five test points (19)；Test correspondence is surveyed
The pressure value of pilot, using the arithmetic mean of instantaneous value of the pressure value everywhere of test as the pressure value in cooling tower exit, is measured simultaneously
The difference of the pressure value in atmospheric pressure value and prevailing circumstances temperature, atmospheric pressure value and cooling tower exit is the resistance in air inlet region
Force value；
4) test of air inlet region resistance coefficient：
The wind speed that cooling tower resistance coefficient is used in calculating is the sectional wind velocity of packing, according to the horizontal stroke of voltage stabilizing straight length (7)
The area in section and the wind speed of the 4th measurement section (18) calculate packing analog board (2) by the equal method of ventilation
Sectional wind velocity：
According to Resistance Value, environment temperature, atmospheric pressure and the packing analog board (2) in the model tower air inlet region tested
The wind speed of section part carries out the calculating of air inlet region resistance coefficient：
The total drag coefficients of model tower are the resistance coefficient in air inlet region and the resistance coefficient sum of air outlet.
8. a kind of crossing current wet cooling tower drag characteristic method of testing according to claim 7, it is characterised in that step 3)
The detailed process of the middle step Adjustment Tests operating mode for using wind speed in tower to test for：When air intake open height correspondence air-admitting surface with
When the cross-sectional area ratio of tower bottom (5) is 0.7, the resistance coefficient of packing analog board (2) is divided into four kinds, is respectively
15th, 25,35 and 45；Wind speed profile in tower under four kinds of resistance coefficients of measurement；When air intake open height correspondence air-admitting surface and tower
When the cross-sectional area ratio of cylinder bottom (5) is 0.8, the resistance coefficient of packing analog board (2) is divided into four kinds, is respectively
15th, 25,35 and 45；Wind speed profile in tower under four kinds of resistance coefficients of measurement；When air intake open height correspondence air-admitting surface and tower
When the cross-sectional area ratio of cylinder bottom (5) is 0.9, the resistance coefficient of packing analog board (2) is divided into four kinds, is respectively
15th, 25,35 and 45；Wind speed profile in tower under four kinds of resistance coefficients of measurement；When air intake open height correspondence air-admitting surface and tower
When the cross-sectional area ratio of cylinder bottom (5) is 1.0, the resistance coefficient of packing analog board (2) is divided into four kinds, is respectively
15、25、35、45；Wind speed profile in tower under four kinds of resistance coefficients of measurement.
9. a kind of crossing current wet cooling tower drag characteristic method of testing according to claim 7, it is characterised in that step 3)
The calculation formula of the Resistance Value in middle air inlet region is as follows：
<mrow>
<mi>&Delta;</mi>
<mi>P</mi>
<mo>=</mo>
<msub>
<mi>P</mi>
<mn>0</mn>
</msub>
<mo>-</mo>
<mfrac>
<mrow>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>n</mi>
</munderover>
<msub>
<mi>P</mi>
<mi>i</mi>
</msub>
</mrow>
<mi>n</mi>
</mfrac>
</mrow>
In formula：The Resistance Value in Δ P-air inlet region, Pa；
P0- atmospheric pressure value, Pa；
N-test point sum；
PiThe corresponding pressure value of-the three measurement section (17) place test point, Pa.
10. a kind of crossing current wet cooling tower drag characteristic method of testing according to claim 7, it is characterised in that step
4) calculation formula of the sectional wind velocity of packing analog board (2) is in：
<mrow>
<mi>V</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mi>A</mi>
<mo>&times;</mo>
<mfrac>
<mrow>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mi>n</mi>
</munderover>
<msub>
<mi>V</mi>
<mi>i</mi>
</msub>
</mrow>
<mi>n</mi>
</mfrac>
</mrow>
<msub>
<mi>A</mi>
<mn>1</mn>
</msub>
</mfrac>
</mrow>
2
In formula：The sectional wind velocity of V-packing analog board (2), m/s；
A1The air-admitting surface of-packing analog board (2), m2；
The area of the cross section of A-voltage stabilizing straight length (7)；
N-test point sum；
ViThe corresponding air speed value of test point, m/s in-the four measurement section (18)；
Step 4) in the calculation formula of air inlet region resistance coefficient be：
<mrow>
<msub>
<mi>&xi;</mi>
<mn>1</mn>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<mi>&Delta;</mi>
<mi>P</mi>
</mrow>
<mrow>
<mfrac>
<mn>1</mn>
<mn>2</mn>
</mfrac>
<msup>
<mi>&rho;V</mi>
<mn>2</mn>
</msup>
</mrow>
</mfrac>
</mrow>
In formula：ξ1The resistance coefficient in-air inlet region；
ρ-obtained atmospheric density, kg/m are calculated by measurement condition atmospheric pressure and environment temperature3；
The sectional wind velocity of V-packing analog board (2), m/s；
The total drag coefficients ξ of model tower is calculated by equation below：
<mrow>
<mi>&xi;</mi>
<mo>=</mo>
<msub>
<mi>&xi;</mi>
<mn>1</mn>
</msub>
<mo>+</mo>
<mi>&alpha;</mi>
<msup>
<mrow>
<mo>(</mo>
<mfrac>
<msub>
<mi>A</mi>
<mn>1</mn>
</msub>
<msub>
<mi>A</mi>
<mn>2</mn>
</msub>
</mfrac>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
</mrow>
In formula：ξ1The resistance coefficient in-air inlet region；
α-air outlet velocity nonuniformity coefficient, and α is 1；
A2The area of the air outlet of-model tower, m2；
A1The air-admitting surface of-packing analog board (2), m2；
The total drag coefficients of ξ-model tower.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109827747A (en) * | 2019-03-12 | 2019-05-31 | 上海理工大学 | For studying the device and method of crossing current filler matrix band flow characteristics |
| CN110531024A (en) * | 2019-08-02 | 2019-12-03 | 中国电子科技集团公司第四十一研究所 | A kind of cigarette test process ambient windstream regulation device |
| CN113536640A (en) * | 2021-07-27 | 2021-10-22 | 江苏科技大学 | Optimal design method of internal flow channel structure of air distributor based on orthogonal test |
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| CN102788517A (en) * | 2012-08-15 | 2012-11-21 | 中国能源建设集团广东省电力设计研究院 | Method and system for designing ultra-large reverse-flow natural ventilation wet cooling tower |
| CN102818691A (en) * | 2012-08-15 | 2012-12-12 | 中国能源建设集团广东省电力设计研究院 | Super large cooling tower simulation test device and feature test method |
| CN204255411U (en) * | 2014-12-18 | 2015-04-08 | 上海金日冷却设备有限公司 | For the crossing current filler test board of cooling tower |
| CN105509541A (en) * | 2016-01-28 | 2016-04-20 | 哈蒙热工环境设备（嘉兴）有限公司 | Anti-blocking water spraying filler for cooling tower |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0579792A (en) * | 1991-09-18 | 1993-03-30 | Showa Shell Sekiyu Kk | Straightening plate for cooling tower |
| CN102788517A (en) * | 2012-08-15 | 2012-11-21 | 中国能源建设集团广东省电力设计研究院 | Method and system for designing ultra-large reverse-flow natural ventilation wet cooling tower |
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| CN204255411U (en) * | 2014-12-18 | 2015-04-08 | 上海金日冷却设备有限公司 | For the crossing current filler test board of cooling tower |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109827747A (en) * | 2019-03-12 | 2019-05-31 | 上海理工大学 | For studying the device and method of crossing current filler matrix band flow characteristics |
| CN110531024A (en) * | 2019-08-02 | 2019-12-03 | 中国电子科技集团公司第四十一研究所 | A kind of cigarette test process ambient windstream regulation device |
| CN113536640A (en) * | 2021-07-27 | 2021-10-22 | 江苏科技大学 | Optimal design method of internal flow channel structure of air distributor based on orthogonal test |
| CN113536640B (en) * | 2021-07-27 | 2023-11-21 | 江苏科技大学 | Optimization design method for internal flow channel structure of air distributor based on orthogonal test |
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