CN114910248A - Inducer cavitation test system and method with temperature control and visualization functions - Google Patents
Inducer cavitation test system and method with temperature control and visualization functions Download PDFInfo
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- CN114910248A CN114910248A CN202210442853.5A CN202210442853A CN114910248A CN 114910248 A CN114910248 A CN 114910248A CN 202210442853 A CN202210442853 A CN 202210442853A CN 114910248 A CN114910248 A CN 114910248A
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- 238000012360 testing method Methods 0.000 title claims abstract description 186
- 239000000411 inducer Substances 0.000 title claims abstract description 35
- 238000012800 visualization Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 117
- 230000007246 mechanism Effects 0.000 claims abstract description 66
- 238000010438 heat treatment Methods 0.000 claims abstract description 35
- 238000010998 test method Methods 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims description 19
- 238000007789 sealing Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 230000007704 transition Effects 0.000 claims description 7
- 229920002313 fluoropolymer Polymers 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 229920001971 elastomer Polymers 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 239000011810 insulating material Substances 0.000 claims description 2
- 239000012780 transparent material Substances 0.000 claims description 2
- 230000000712 assembly Effects 0.000 claims 2
- 238000000429 assembly Methods 0.000 claims 2
- 230000004382 visual function Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 9
- 239000007788 liquid Substances 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 3
- 238000005086 pumping Methods 0.000 abstract description 3
- 239000006244 Medium Thermal Substances 0.000 abstract description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
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- 230000000007 visual effect Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
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- 231100000956 nontoxicity Toxicity 0.000 description 1
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- 229910052760 oxygen Inorganic materials 0.000 description 1
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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
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Testing Of Engines (AREA)
Abstract
The invention relates to a cavitation visualization test system and method, in particular to an inducer cavitation test system and method with temperature control and visualization functions for a pumping pressure type low-temperature liquid rocket engine, and aims to overcome the defects that the medium thermal effect is not considered in the conventional inducer cavitation test and the visualization observation of cavitation flow in an inducer cannot be realized. The inducer cavitation test system and method with temperature control and visualization functions comprise a water storage mechanism, a test mechanism, a high-speed camera mechanism and a temperature control mechanism; the test mechanism adopts a transparent test shell and is matched with a high-speed camera mechanism to realize high-definition shooting of the cavitation flow in the test piece; the closed-loop control formed among the heating device, the controller and the temperature sensor in the temperature control mechanism can realize accurate and stable control of the incoming flow temperature of the inlet of the test shell. Meanwhile, the invention provides an inducer cavitation test method with temperature control and visualization functions.
Description
Technical Field
The invention relates to a cavitation visualization test system and method, in particular to an inducer cavitation test system and method with temperature control and visualization functions for a pumping pressure type low-temperature liquid rocket engine.
Background
Liquid oxygen, liquid hydrogen and other low-temperature media have the advantages of large specific impulse, no toxicity, no pollution and the like, and are used as a new generation of pumping pressure type low-temperature liquid rocket engine propellant. Under specific working conditions, cavitation can occur inside the turbine pump, so that the vibration magnitude of the pump is abnormally increased, and a strong destructive effect is generated. The cavitation nature is a phase transition process from a liquid phase to a vapor phase, heat from a main flow needs to be absorbed, the temperature of liquid near a cavitation area is reduced, corresponding saturated vapor pressure is also influenced, further development of cavitation is inhibited, and the inhibition effect is a cavitation heat effect.
In order to obtain the operating characteristics of the turbo pump, a model test is usually performed in a circulating water tunnel, that is, a reasonable test device is used to create a test piece inflow condition similar to the real operating state, and the operating performance data of the test piece is collected, wherein the test piece is generally a real product or a reduced scale. The method is characterized in that the model test is adopted to obtain the cavitation performance of the turbopump, which is an important link in the process of developing the liquid rocket engine, and the obtained cavitation performance of the turbopump can be used for guiding the further optimization design of the turbopump.
Due to the complexity of cavitation, visualization is an important experimental approach. The cavitation process of the low-temperature medium is obviously different from normal-temperature water cavitation due to a strong cavitation heat effect. The cavitation visualization test is directly carried out on low-temperature media such as liquid oxygen and the like, the technical difficulty is extremely high, and the simulation of the thermal effect of the low-temperature media by adopting high-temperature water is a technical approach with high realizability. According to the conversion of the existing cavitation heat effect similarity theory, when the rotating speed of an oxygen pump inducer which is 18000rpm and takes-183 ℃ liquid oxygen as working medium is converted to the working condition of a laboratory with the rotating speed of 3000rpm, the required water temperature reaches 90 ℃. At present, most of experimental researches on inducer cavitation are based on normal-temperature water, high-temperature water cavitation tests are directly carried out, and the problems that incoming flow temperature of a test section is unstable due to high heat dissipation of a pipeline, heating quantity is large, difficulty of heating temperature control equipment is high, cost is high, leakage is caused by failure of a sealing device, a sensor is easy to damage and the like exist. Meanwhile, under the condition of ensuring accurate control of pressure and temperature in the test device, the realization of the visual observation of the cavitation flow in the inducer has certain technical difficulty,
disclosure of Invention
The invention aims to overcome the defects that the medium thermal effect is not considered in the conventional inducer cavitation test and the visualized observation of cavitation flow in an inducer cannot be realized, and provides an inducer cavitation test system and method with temperature control and visualization functions.
In order to solve the defects of the prior art, the invention provides the following technical solutions:
an inducer cavitation test system with temperature control and visualization functions is characterized in that: the device comprises a water storage mechanism, a test mechanism, a high-speed camera mechanism, a temperature control mechanism and a pressure monitoring mechanism;
the water storage mechanism comprises a water storage tank and an air bag arranged in the water body of the water storage tank, and an air inlet/exhaust valve of the air bag is arranged outside the water storage tank;
the testing mechanism comprises a base, a motor, a torque meter and a testing shell, wherein the motor, the torque meter and the testing shell are arranged on the base;
a first outlet of the water storage tank is provided with a water inlet/outlet valve and is connected with an external water source; a second outlet of the water storage tank is connected with an inlet of the test shell through a first pipeline, a stop valve and a rectifying section are sequentially arranged on the first pipeline along the flowing direction of water flow, and the interior of the rectifying section is of a honeycomb structure; the outlet of the test shell is connected with the inlet of the water storage tank through a second pipeline, a flow regulating mechanism is arranged on the second pipeline, and the flow regulating mechanism comprises a process pump, a flow meter and a flow valve which are sequentially arranged along the flow direction of water flow;
the temperature control mechanism comprises a heating device arranged on the water storage tank, a temperature sensor positioned on the first pipeline and close to the test shell, and a controller arranged between the heating device and the temperature sensor;
the pressure detection mechanism comprises a first pressure sensor positioned on the first pipeline and close to the test shell and a second pressure sensor positioned on the second pipeline and close to the test shell.
Furthermore, the testing mechanism also comprises a supporting seat, a retainer and a rotating shaft; the torque meter is coaxially connected with a test piece in the test shell through a rotating shaft, one end of the rotating shaft is fixed on the supporting seat through a first bearing, the inner ring of the first bearing is fixed with the rotating shaft, and the outer ring of the first bearing is fixed with the supporting seat; the other end of the rotating shaft extends into the test shell, a second bearing is arranged between the rotating shaft and the test shell, the inner ring of the second bearing is fixed with the rotating shaft, the outer ring of the second bearing is fixed on the supporting seat through a bearing seat, and a test piece is tightly pressed at the end part of the rotating shaft through a shaft end nut; a transition piece is arranged on the part of the rotating shaft between the second bearing and the test piece and used for reducing flow resistance loss;
one end of the test shell is positioned in the bearing seat, the other end of the test shell is positioned in the retainer, and a plurality of fixing columns are arranged between the supporting seat and the retainer and used for ensuring that the joint is not leaked and facilitating replacement of the test shell;
the supporting seat is fixed with the base through a plurality of connecting holes.
Furthermore, the rectifying section is fixed with the first pipeline through an external flange, and a plurality of first through holes, a plurality of second through holes and third through holes are formed in the rectifying section and are positioned in the middle of the radial section of the rectifying section; the first through holes are arranged in a matrix form, and the number of rows is equal to the number of columns; the second through holes and the third through holes are uniformly distributed in multiple groups and are uniformly distributed along the periphery of the radial section of the rectifying section; the diameter of the first through hole, the diameter of the second through hole and the diameter of the third through hole are sequentially decreased; above-mentioned structure can effectively reduce the incoming flow turbulence degree, guarantees that experimental casing entry incoming flow is even steady, provides reliable experimental flow condition.
Furthermore, the heating device comprises a sleeve pipe extending into the water body of the water storage tank and a plurality of heating pipes arranged in the sleeve pipe, and the sleeve pipe is fixed with the water storage tank through a flange arranged on the outer wall of the water storage tank; the number of the heating pipes is set according to the requirement of heat load, and if the heating pipes need to be replaced, the heating pipes are directly taken out from the sleeve without disassembling the flange.
Further, the high-speed camera shooting mechanism comprises a camera, and an illuminating device and a storage device which are arranged on the camera.
Further, all be provided with seal assembly between pivot and the first bearing inner circle, between pivot and the second bearing inner circle, seal assembly is for establishing epaxial axle sleeve and O type sealing washer including coaxial cover, O type sealing washer adopts high temperature resistant fluoroplastics that surpasss 130 ℃, prevents that the material from taking place deformation under the high temperature, leads to the leakage.
Furthermore, the water storage tank, the first pipeline, the second pipeline and the rectification section are all wrapped with energy-receiving heat-insulating blanket heat-insulating materials for reducing heat dissipation and ensuring the stability of the temperature of the water body.
Further, the air bag is made of a rubber material capable of resisting the high temperature of 120 ℃ at most, and the transition piece is made of fluoroplastic resistant to the high temperature exceeding 130 ℃.
Meanwhile, the invention provides an inducer cavitation test method with temperature control and visualization functions, which is characterized in that the inducer cavitation test system with temperature control and visualization functions comprises the following steps:
step 1, opening a water inlet/discharge valve to feed/discharge water to a water storage tank, and closing the water inlet/discharge valve after the water level in the water storage tank reaches a test preset water level;
step 3, opening a stop valve, a process pump and a flow valve, keeping the first pipeline and the second pipeline in a circulation state, and then adjusting the pressure in the air bag through an air inlet/exhaust valve to enable the pressure value of the first pressure sensor to reach a test preset pressure;
step 4, starting the heating device, the temperature sensor and the controller to circularly heat the water body of the test system, and controlling the heating power of the heating device in real time according to the preset water temperature of the test by receiving the water temperature fed back by the temperature sensor by the controller;
step 5, adjusting the rotating speed of the motor until the rotating speed of the test piece in the test shell reaches a test preset rotating speed;
step 6, adjusting the process pump and the flow valve until the flow value of the flowmeter reaches a test preset flow, and adjusting the air inlet/exhaust valve to enable the pressure value of the first pressure sensor to reach a test preset pressure;
step 7, after the water temperature fed back by the temperature sensor, the rotating speed of the test piece, the flow value of the flowmeter and the pressure value of the first pressure sensor meet the test requirements, starting the test; in the test process, the high-speed camera shooting mechanism is used for shooting and recording the test piece, and the first pressure sensor and the second pressure sensor are used for respectively acquiring the steady-state pressures of the first pipeline close to the test shell and the second pipeline close to the test shell so as to obtain the working performance of the test piece.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention relates to an inducer cavitation test system with temperature control and visualization functions, which comprises a water storage mechanism, a test mechanism, a high-speed camera shooting mechanism and a temperature control mechanism, wherein the water storage mechanism is connected with the test mechanism; an air bag for adjusting water pressure is arranged in a water storage tank in the water storage mechanism, so that direct contact between an air source and water (increase of dissolved gas in water can be caused) is avoided, and the reliability of a cavitation test is improved; the test mechanism adopts a transparent test shell and is matched with a high-speed camera mechanism to realize high-definition shooting of the cavitation flow in the test piece; the closed-loop control formed among the heating device, the controller and the temperature sensor in the temperature control mechanism can realize accurate and stable control of the incoming flow temperature of the inlet of the test shell.
(2) The invention relates to an inducer cavitation test system with temperature control and visualization functions, which comprises a first pipeline and a second pipeline; the first pipeline is provided with a rectifying section for reducing incoming flow turbulence and improving the accuracy of incoming flow pressure measurement; and the second pipeline is provided with a flow regulating mechanism for compensating the flow loss of the first pipeline, so that the stable flow state of the water body is ensured, and the test system is normal in circulation.
(3) The inducer cavitation test method with temperature control and visualization functions realizes accurate control of working medium temperature through the temperature control mechanism and high-definition shooting of cavitation flow through the test mechanism and the high-speed camera shooting mechanism, can realize visual observation on cavitation flow tests with different thermal effect strengths, and has certain guiding significance in cavitation-related fields such as fluid pipeline conveying, valves and the like
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of an inducer cavitation test system with temperature control and visualization functions;
FIG. 2 is a schematic structural diagram of a rectifying section in the embodiment of FIG. 1;
FIG. 3 is a schematic structural view of the test housing in the embodiment of FIG. 1;
FIG. 4 is a schematic structural diagram of a test piece in the embodiment of FIG. 1.
The reference numerals are explained below: 01-test piece; 11-water storage tank, 111-water inlet/outlet valve, 12-air bag, 121-air inlet/outlet valve; 21-base, 22-motor, 23-torquemeter, 24-test shell and 25-support seat; 26-rotating shaft, 27-first bearing, 28-second bearing, 29-bearing seat, 210-shaft end nut, 211-transition piece, 212-retainer, 213-fixing column, 214-sealing component, 215-connecting hole; 3-a high-speed camera mechanism; 41-heating device, 42-temperature sensor, 43-controller; 51-a first pressure sensor, 52-a second pressure sensor; 6-first pipeline, 61-stop valve; 7-a second pipeline; 8-rectifying section, 81-first through hole, 82-second through hole, 83-third through hole; 91-process pump, 92-flow meter, 93-flow valve.
Detailed Description
The invention will be further elucidated with reference to the drawing and exemplary embodiments.
Referring to fig. 1 to 4, an inducer cavitation test system with temperature control and visualization functions comprises a water storage mechanism, a test mechanism, a high-speed camera mechanism 3, a temperature control mechanism and a pressure monitoring mechanism.
The water storage mechanism comprises a water storage tank 11 and an air bag 12 arranged in the water body of the water storage tank 11, the water storage tank 11 is made of stainless steel, the volume is 1000L, the volume is 40L when the air bag 12 is naturally filled, an air inlet/exhaust valve 121 of the air bag 12 is arranged outside the water storage tank 11, the air bag 12 is connected with an external air source through the air inlet/exhaust valve 121, and the air bag 11 is pressurized or depressurized by inflating or exhausting to control the volume of the air bag 12.
The testing mechanism comprises a base 21, a motor 22, a torquer 23, a testing shell 24, a supporting seat 25, a retainer 212 and a rotating shaft 26, wherein the motor 22, the torquer 23, the testing shell 24, the supporting seat 25, the retainer 212 and the rotating shaft 26 are arranged on the base 21, the torquer 23 is used for measuring the torque of the test piece 01 in the testing process so as to calculate the efficiency, and meanwhile, whether the test piece 01 normally operates can be judged by monitoring the torque in real time.
The motor 22 is connected with a test piece 01 in the test shell 24 sequentially through the torque meter 23 and the rotating shaft 26, one end of the rotating shaft 26 is fixed on the supporting seat 25 through the first bearing 27, the inner ring of the first bearing 27 is fixed with the rotating shaft 26, and the outer ring of the first bearing 27 is fixed with the supporting seat 25; the other end of the rotating shaft 26 extends into the test shell 24, a second bearing 28 is arranged between the rotating shaft 26 and the test shell 24, the inner ring of the second bearing 28 is fixed with the rotating shaft 26, the outer ring of the second bearing 28 is fixed on the supporting seat 25 through a bearing seat 29, and the test piece 01 is tightly pressed on the end part of the rotating shaft 26 through a shaft end nut 210; a transition piece 211 is arranged on the part of the rotating shaft 26 between the second bearing 28 and the test piece 01 and used for reducing flow resistance loss; sealing components 214 are arranged between the rotating shaft 26 and the inner ring of the first bearing 27 and between the rotating shaft 26 and the inner ring of the second bearing 28, the sealing components 214 comprise a shaft sleeve and an O-shaped sealing ring which are coaxially sleeved on the rotating shaft 26, and the O-shaped sealing ring is made of fluoroplastic resistant to high temperature and higher than 130 ℃, so that the material is prevented from deforming at high temperature and leaking.
One end of the test shell 24 is positioned in the bearing seat 29, the other end of the test shell 24 is positioned in the retainer 212, a plurality of fixing columns 213 are arranged between the support seat 25 and the retainer 212, and the support seat 25 is fixed with the base 21 through a plurality of connecting holes 215; the above-described fastening ensures that no leaks occur at the connection and facilitates replacement of the test housing 24. During testing, the connection end of the test housing 2424 and the retainer 212 is the inlet of the test housing 24, and the connection end of the test housing 24 and the bearing seat 29 flows out to be the outlet of the test housing 24.
The experimental casing 24 adopts transparent material's organic glass, and experimental casing 24 sets up outward high-speed camera shooting mechanism 3, high-speed camera shooting mechanism 3 include the camera to and lighting device and the storage device of setting on the camera. In order to avoid that the vibration magnitude of the test piece 01 is too high in the test process, the mass of the test piece is reduced as much as possible, and the test piece is made of aluminum.
The first outlet of the water storage tank 11 is provided with a water inlet/outlet valve 111, and the first outlet of the water storage tank 11 is connected with an external water source for adding or discharging water to the whole test system.
A second outlet of the water storage tank 11 is connected with an inlet of the test shell 24 through a first pipeline 6, and a stop valve 61 and a rectifying section 8 are sequentially arranged on the first pipeline 6 along the water flow direction; the stop valve 61 is used for stopping the water body, so that the debugging and the maintenance of the test mechanism are facilitated; the rectifying section 8 is fixed with the first pipeline 6 through an external flange, and sixteen first through holes 81, eight second through holes 82 and eight third through holes 83 are formed in the rectifying section 8 and are positioned in the center of the radial section of the rectifying section 8; the diameter of the radial section of the rectifying section 8 is Dmm, the diameter of the first through holes 81 is Amm, the first through holes 81 are arranged in a matrix form, the number of rows is equal to the number of columns, the diameters of the second through holes 82 and the third through holes 83 are Bmm and Cmm respectively, the second through holes 82 and the third through holes 83 are divided into four groups, and the four groups of through holes are uniformly arranged along the periphery of the radial section of the rectifying section 8; the rectifying section 8 can effectively reduce incoming flow turbulence, ensure that incoming flow at the inlet of the test shell 24 is uniform and stable, and provide reliable test flow conditions; in this embodiment, A, B, C, D takes on values of 16, 12, 8, and 100, respectively.
An outlet of the test shell 24 is connected with an inlet of the water storage tank 11 through a second pipeline 7, the second pipeline 7 is provided with a flow regulating mechanism, and the flow regulating mechanism is sequentially provided with a process pump 91, a flow meter 92 and a flow valve 93 along the flow direction of water flow; the process pump 91 is used for increasing the flow capacity of outlet water of the test shell 24, overcoming pipeline flow loss of parts such as the rectifying section 8 and the like, and ensuring stable water flow state and normal circulation of a test system; the flow meter 92 is an electromagnetic flow meter 92 and is used for collecting the flow in the second pipeline 7; the flow valve 93 is used to control the water flow in cooperation with the process pump 91.
The temperature control mechanism comprises a heating device 41 arranged on the water storage tank 11, a temperature sensor 42 positioned on the first pipeline 6 and close to the test shell 24, and a controller 43 arranged between the heating device 41 and the temperature sensor 42; the heating device 41 comprises a sleeve extending into the water body of the water storage tank 11 and ten heating pipes arranged in the sleeve, the sleeve is made of stainless steel 304 and is fixed with the water storage tank 11 through a flange arranged on the outer wall of the water storage tank 11, the total power of the ten heating pipes is 60kW, the number of the heating pipes is set according to the heat load requirement, and if the heating pipes need to be replaced, the heating pipes are directly taken out of the sleeve without detaching the flange; the constant temperature control algorithm of the temperature control mechanism adopts PID control, and the controller 43 adjusts the heating power of the heating device 41 in real time according to the water temperature fed back by the temperature sensor 42, so as to realize accurate control of the incoming flow temperature at the inlet of the test shell 24.
The pressure detection means comprises a first pressure sensor 51 located on the first line 6 near the test housing 24 and a second pressure sensor 52 located on the second line 7 near the test housing 24.
In this embodiment, the first pipeline 6 and the second pipeline 7 are both stainless steel pipelines with an inner diameter of 100mm, the water storage tank 11 and all pipelines exposed to the external environment are wrapped with a nano energy heat insulation blanket heat insulation material with a thickness of 20mm, and the heat insulation effect of the material is twice that of a conventional heat insulation material under the same thickness.
In order to prevent the leakage caused by the deformation of the material at high temperature, the air bag 12 is made of rubber material which can resist the high temperature of 120 ℃, and the transition piece 211 and O-shaped sealing rings at the joints of all pipelines in the test system are made of fluoroplastic which can resist the high temperature of more than 130 ℃.
By adopting the inducer cavitation test device with the temperature control and visualization functions, the invention provides an inducer cavitation test method with the temperature control and visualization functions, which comprises the following steps:
step 1, opening a water inlet/outlet valve 111 to feed water into/drain the water storage tank 11, and closing the water inlet/outlet valve 111 after the water level in the water storage tank 11 reaches a test preset water level;
step 3, opening the stop valve 61, the process pump 91 and the flow valve 93, keeping the first pipeline 6 and the second pipeline 7 in a circulating state, and then adjusting the pressure in the air bag 12 through the air inlet/outlet valve 121 to enable the pressure value of the first pressure sensor 51 to reach the test preset pressure;
step 4, starting the heating device 41, the temperature sensor 42 and the controller 43 to circularly heat the water body of the test system, and controlling the heating power of the heating device 41 in real time according to the preset water temperature in the test by the controller 43 receiving the water temperature fed back by the temperature sensor 42;
step 5, adjusting the rotating speed of the motor 22 until the rotating speed of the test piece 01 in the test shell 24 reaches a test preset rotating speed;
step 6, adjusting the process pump 91 and the flow valve 93 until the flow value of the flow meter 92 reaches the test preset flow, and simultaneously adjusting the air inlet/exhaust valve 121 to enable the pressure value of the first pressure sensor 51 to reach the test preset pressure;
step 7, after the water temperature fed back by the temperature sensor 42, the rotating speed of the test piece 01, the flow value of the flowmeter 92 and the pressure value of the first pressure sensor 51 are determined to meet the test requirements, starting the test; in the test process, the high-speed camera mechanism 3 is used for shooting and recording the test piece 01, and the first pressure sensor 51 and the second pressure sensor 52 are used for respectively acquiring the steady-state pressures of the first pipeline 6 close to the test shell 24 and the second pipeline 7 close to the test shell 24 so as to obtain the working performance of the test piece 01.
The above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, and it is obvious for a person skilled in the art to modify the specific technical solutions described in the foregoing embodiments or to substitute part of the technical features, and these modifications or substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions protected by the present invention.
Claims (9)
1. The utility model provides an inducer cavitation test system with accuse temperature, visual function which characterized in that: the device comprises a water storage mechanism, a testing mechanism, a high-speed camera mechanism (3), a temperature control mechanism and a pressure monitoring mechanism;
the water storage mechanism comprises a water storage tank (11) and an air bag (12) arranged in the water body of the water storage tank (11), and an air inlet/exhaust valve (121) of the air bag (12) is arranged outside the water storage tank (11);
the testing mechanism comprises a base (21), a motor (22), a torquemeter (23) and a testing shell (24), wherein the motor (22), the torquemeter (23) and the testing shell (24) are arranged on the base (21), the motor (22) is connected with a test piece (01) in the testing shell (24) through the torquemeter (23), the testing shell (24) is made of transparent materials, and the high-speed camera shooting mechanism (3) is arranged outside the testing shell (24);
a first outlet of the water storage tank (11) is provided with a water inlet/outlet valve (111), and the first outlet of the water storage tank (11) is connected with an external water source; a second outlet of the water storage tank (11) is connected with an inlet of the test shell (24) through a first pipeline (6), a stop valve (61) and a rectifying section (8) are sequentially arranged on the first pipeline (6) along the flowing direction of water flow, and the interior of the rectifying section (8) is of a honeycomb structure; an outlet of the test shell (24) is connected with an inlet of the water storage tank (11) through a second pipeline (7), a flow regulating mechanism is arranged on the second pipeline (7), and the flow regulating mechanism comprises a process pump (91), a flow meter (92) and a flow valve (93) which are sequentially arranged along the flow direction of water flow;
the temperature control mechanism comprises a heating device (41) arranged on the water storage tank (11), a temperature sensor (42) positioned on the first pipeline (6) and close to the test shell (24), and a controller (43) arranged between the heating device (41) and the temperature sensor (42);
the pressure detection mechanism comprises a first pressure sensor (51) located on the first pipeline (6) close to the test shell (24) and a second pressure sensor (52) located on the second pipeline (7) close to the test shell (24).
2. The inducer cavitation test system with temperature control and visualization functions as claimed in claim 1, wherein: the testing mechanism further comprises a supporting seat (25), a retainer (212) and a rotating shaft (26); the torque meter (23) is coaxially connected with a test piece (01) in the test shell (24) through a rotating shaft (26), one end of the rotating shaft (26) is fixed on the supporting seat (25) through a first bearing (27), the inner ring of the first bearing (27) is fixed with the rotating shaft (26), and the outer ring of the first bearing (27) is fixed with the supporting seat (25); the other end of the rotating shaft (26) extends into the test shell (24), a second bearing (28) is arranged between the rotating shaft (26) and the test shell (24), the inner ring of the second bearing (28) is fixed with the rotating shaft (26), the outer ring of the second bearing (28) is fixed on the supporting seat (25) through a bearing seat (29), and the test piece (01) is tightly pressed at the end part of the rotating shaft (26) through a shaft end nut (210); a transition piece (211) is arranged on the part of the rotating shaft (26) between the second bearing (28) and the test piece (01);
one end of the test shell (24) is positioned in the bearing seat (29), the other end of the test shell (24) is positioned in the retainer (212), and a plurality of fixing columns (213) are arranged between the support seat (25) and the retainer (212);
the supporting seat (25) is fixed with the base (21) through a plurality of connecting holes (215).
3. The inducer cavitation test system with temperature control and visualization functions as claimed in claim 2, wherein: the rectifying section (8) is fixed with the first pipeline (6) through an external flange, and a plurality of first through holes (81) positioned in the middle of the radial section of the rectifying section (8), a plurality of second through holes (82) positioned on the periphery of the first through holes (81) and a plurality of third through holes (83) are formed in the rectifying section (8); the first through holes (81) are arranged in a matrix form, and the number of rows is equal to the number of columns; the second through holes (82) and the third through holes (83) are divided into a plurality of groups and are uniformly arranged along the periphery of the radial section of the rectifying section (8); the diameter of the first through hole (81), the diameter of the second through hole (82) and the diameter of the third through hole (83) are sequentially decreased progressively.
4. The inducer cavitation test system with temperature control and visualization functions as claimed in claim 2 or 3, wherein: heating device (41) including stretching into the sleeve pipe in water storage tank (11) water and setting up the many heating pipes in the sleeve pipe, the sleeve pipe is fixed with water storage tank (11) through setting up the flange on water storage tank (11) outer wall.
5. The inducer cavitation test system with temperature control and visualization functions as claimed in claim 4, wherein the inducer cavitation test system comprises: the high-speed camera shooting mechanism (3) comprises a camera, and an illuminating device and a storage device which are arranged on the camera.
6. The inducer cavitation test system with temperature control and visualization functions as claimed in claim 5, wherein: sealing assemblies (214) are arranged between the rotating shaft (26) and the inner ring of the first bearing (27) and between the rotating shaft (26) and the inner ring of the second bearing (28), and the sealing assemblies (214) comprise shaft sleeves and O-shaped sealing rings which are coaxially sleeved on the rotating shaft (26).
7. The inducer cavitation test system with temperature control and visualization functions as claimed in claim 6, wherein: the water storage tank (11), the first pipeline (6), the second pipeline (7) and the rectifying section (8) are all wrapped with energy-receiving heat-insulating blanket heat-insulating materials.
8. The inducer cavitation test system with temperature control and visualization functions as claimed in claim 7, wherein: the air bag (12) is made of rubber materials capable of resisting the high temperature of 120 ℃ at most, and the transition piece (211) is made of fluoroplastic resistant to the high temperature of more than 130 ℃.
9. An inducer cavitation test method with temperature control and visualization functions is characterized in that the inducer cavitation test system with temperature control and visualization functions, which is disclosed by claim 1, is adopted, and comprises the following steps:
step 1, opening a water inlet/discharge valve (111) to carry out water inlet/discharge on a water storage tank (11), and closing the water inlet/discharge valve (111) after the water level in the water storage tank (11) reaches a test preset water level;
step 2, opening the air inlet/outlet valve (121), and closing the air inlet/outlet valve (121) after ensuring that the pressure in the air bag (12) is 0.08 MPa-0.12 MPa;
step 3, opening the stop valve (61), the process pump (91) and the flow valve (93), keeping the first pipeline (6) and the second pipeline (7) in a circulating state, and then adjusting the pressure in the air bag (12) through the air inlet/exhaust valve (121) to enable the pressure value of the first pressure sensor (51) to reach a preset test pressure;
step 4, starting the heating device (41), the temperature sensor (42) and the controller (43) to circularly heat the water body of the test system, wherein the controller (43) receives the water temperature fed back by the temperature sensor (42) and controls the heating power of the heating device (41) in real time according to the preset water temperature of the test;
step 5, adjusting the rotating speed of the motor (22) until the rotating speed of the test piece (01) in the test shell (24) reaches a test preset rotating speed;
step 6, adjusting the process pump (91) and the flow valve (93) until the flow value of the flow meter (92) reaches a test preset flow, and adjusting the air inlet/exhaust valve (121) to enable the pressure value of the first pressure sensor (51) to reach a test preset pressure;
step 7, after the water temperature fed back by the temperature sensor (42), the rotating speed of the test piece (01), the flow value of the flowmeter (92) and the pressure value of the first pressure sensor (51) are determined to meet the test requirements, the test is started; in the test process, the high-speed camera mechanism (3) is used for shooting and recording the test piece (01), and the first pressure sensor (51) and the second pressure sensor (52) are used for respectively acquiring the steady-state pressures of the first pipeline (6) close to the test shell (24) and the second pipeline (7) close to the test shell (24) so as to obtain the working performance of the test piece (01).
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