CN105203545A - Observation system and method of spray cooling liquid film pattern under unfavorable high overload - Google Patents
Observation system and method of spray cooling liquid film pattern under unfavorable high overload Download PDFInfo
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- 239000007921 spray Substances 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 31
- 239000000110 cooling liquid Substances 0.000 title claims abstract description 26
- 238000001816 cooling Methods 0.000 claims abstract description 95
- 239000007788 liquid Substances 0.000 claims abstract description 95
- 239000002699 waste material Substances 0.000 claims abstract description 30
- 238000012360 testing method Methods 0.000 claims abstract description 21
- 238000011084 recovery Methods 0.000 claims abstract description 11
- 238000009434 installation Methods 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 7
- 230000002411 adverse Effects 0.000 claims description 25
- 238000005507 spraying Methods 0.000 claims description 20
- 230000001133 acceleration Effects 0.000 claims description 14
- 239000011521 glass Substances 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 11
- 238000004088 simulation Methods 0.000 claims description 11
- 238000006073 displacement reaction Methods 0.000 claims description 7
- 239000006185 dispersion Substances 0.000 claims description 6
- 238000000889 atomisation Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 239000002826 coolant Substances 0.000 claims 4
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Abstract
The invention discloses an observation system and method of spray cooling liquid film pattern under unfavorable high overload. By observing the thickness of a cooling surface liquid film and a formation process and flow pattern of the liquid film when liquid drops hit against walls in a spray cooling test under the unfavorable high overload environment, a spray cooling model and a heat transfer rule under the unfavorable high overload are revealed. By improving pressure sources and a waste liquor recovery part of a spray cooling system, the anti-overload ability is achieved, the stable working medium flow performed under the unfavorable overload is ensured, and the spray cooling and the waste liquid recovery are finished. In addition, by combining an anti-overload spray cooling observation system and a centrifugal testing machine, and by controlling angles of installation of anti-overload spray cooling observation system and the centrifugal testing machine, different unfavorable high overload environments can be simulated, observation of the spray cooling liquid film is realized under different high overload environments, a cooling principle further analyzed under the unfavorable high overload and influences on cooling under the unfavorable high overload environment on the basis of obtaining data and phenomena are achieved.
Description
Technical Field
The invention relates to an unfavorable high-overload spray cooling liquid film form observation system and method, which are suitable for inspecting and perfecting a spray cooling analysis model and a phase change heat transfer criterion under unfavorable high overload.
Background
The ratio of the resultant force of aerodynamic force and engine thrust acting on an aircraft to the gravity of the aircraft is called the overload of the aircraft, and the magnitude of the overload which can be borne by the aircraft is an important parameter for measuring the maneuverability of the aircraft. The overload is mainly generated due to the lift force of the wings, and when the wings turn horizontally or roll over the fins, the lift force generated by the wings is greater than the gravity; when the aircraft dives or levels after climbing rapidly, the lift force generated by the wings is smaller than gravity, in other words, the aircraft can be overloaded after making high maneuvering actions in flight, the more violent the maneuvering actions are, the larger the overload is, so that the overload or even unfavorable high overload environment can be generated in the flight mission. Generally speaking, the impact of overload on the operators of the aircraft, i.e. the pilots, is mainly considered, but it is not negligible that overload affects not only the aircraft movement but also the environmental control parts of the aircraft.
An aircraft environmental control system is a complete set of equipment that ensures that the aircraft cabin and equipment compartment have the appropriate environmental conditions for the passengers and equipment to function properly. Aircraft environmental control systems include cabin air supply and distribution, cabin pressure control, temperature control, humidity control, and the like. The temperature control system reasonably controls hot air and cold air to balance the heat load of the cabin so as to achieve the aim of controlling the temperature of the cabin. More importantly, with the development of scientific technology, the electronic devices on board modern airplanes are increased increasingly, and a large amount of heat is also generated, so that the temperature environment of the electronic devices is deteriorated, the cabin temperature is also greatly influenced, and the electronic devices must be cooled. The cooling of electronic equipment is an important problem in the control of the cabin temperature of an aircraft due to the high power consumption and high requirements. In order to ensure safe flight of an aircraft, various heat sources represented by electronic equipment need to be cooled, and a spray cooling technology is a common cooling technology.
Based on the above two points, it is a key issue to investigate whether spray cooling can be effectively performed under an overload condition, and particularly, it is worth studying whether spray cooling can be performed well under an environment where an overload acceleration is large, that is, an unfavorable high overload condition. Different from ground equipment, when the airplane does maneuvering flight (such as hovering flight), the onboard thermal control device can turn over along with the movement of the airplane, so that the axis of the nozzle forms a certain angle with the gravity direction, and the angle is temporarily defined as a spraying angle; when the airplane changes the flight state (such as accelerating or decelerating flight), the onboard thermal control device is affected by overload from different directions. For a spray cooling system, the liquid film attached to the heat exchange surface has a remarkable influence on heat exchange. The change of the spray angle or the existence of the additional inertia force can affect the thickness, the flow speed, the flow form and the like of the liquid film on the heat exchange surface, and further affect the heat exchange performance of spray cooling.
Disclosure of Invention
In view of the problems, in order to evaluate the influence of an airborne environment on spray cooling heat exchange, the invention provides an unfavorable high-overload spray cooling liquid film form observation system which is used for detecting and perfecting a spray cooling theoretical analytical model and a phase change heat transfer criterion under unfavorable high overload.
According to one aspect of the invention, the anti-overload spray cooling observation system is combined with the centrifugal testing machine, and the pressure source part, the waste liquid recovery part and the like of the spray cooling system are improved to enable the spray cooling system to have anti-overload capacity, so that the observation can be effectively carried out; by controlling the installation angles of the observation system and the testing machine, different adverse high-overload environments are simulated, and the thickness of local liquid films at different observation points and the forming process and the flow form of the liquid film after liquid drops impact the wall surface are obtained by using the observation system, so that the spray cooling theory analytical model and the phase change heat transfer criterion under adverse high overload are inspected and perfected.
According to one aspect of the present invention, there is provided a method for observing the film morphology of an unfavorable high-overload spray cooling liquid, comprising:
the overload pressure source resisting part is used for ensuring that stable working medium atomization pressure is provided in a high overload environment;
the spray cooling chamber part is used for carrying out spray cooling heat exchange and recovering waste liquid;
the liquid film observing and measuring part is used for obtaining the local liquid film thickness of different observation points and the forming process and the flow form of the liquid film after the liquid drops impact the wall surface;
the centrifugal test bed is used for providing various unfavorable high overload acceleration environments;
the observation method is used for providing unfavorable high overload environments required by observation and carrying out spray observation under various unfavorable high overload environments.
Drawings
FIG. 1 is a schematic diagram of an adverse high overload spray cooling liquid film morphology observation system according to one embodiment of the present invention.
Fig. 2(a), 2(b), 2(c) are used to illustrate the workflow of a disadvantageous high-overload environment observation system according to one embodiment of the present invention.
Fig. 3 is a flow chart of the operation of an anti-overload pressure source according to one embodiment of the invention.
Fig. 4 is a flow chart of the operation of a base waste recovery system according to one embodiment of the present invention.
Figure 5 is a workflow diagram of liquid film observation and measurement according to one embodiment of the invention.
Detailed Description
The invention aims to provide a method for observing the form of a spray cooling liquid film under unfavorable high overload, which is used for determining a spray cooling model and a heat transfer criterion under the unfavorable high overload environment by observing the thickness of the liquid film on a cooling surface and the forming process and the flow form of the liquid film after liquid drops impact a wall surface in the spray cooling observation under the unfavorable high overload environment. According to the scheme, the pressure source part and the waste liquid recovery part of the spray cooling system are improved, so that the spray cooling system has overload resistance, stable working medium flowing, spray cooling and waste liquid recovery of the system can be ensured under an overload environment, and smooth observation is further ensured; by combining the overload-resistant spray cooling observation system with the centrifugal testing machine and controlling the installation angles of the observation system and the testing machine, different adverse high overload environments are simulated, the observation of spray cooling liquid films in different high overload environments is realized, and the influence of a cooling model under adverse high overload and the adverse high overload environment on cooling is further analyzed on the basis of obtaining data and phenomena.
The ratio of the resultant force of aerodynamic force and engine thrust acting on an aircraft to the gravity of the aircraft is called the overload of the aircraft, and the magnitude of the overload which can be borne by the aircraft is an important parameter for measuring the maneuverability of the aircraft. The overload is generated after the airplane performs high maneuvering actions in flight, and the more violent the maneuvering actions are, the larger the overload is generated, so that the overload and even the unfavorable high overload environment can be generated inevitably in the flight mission. Generally speaking, the impact of overload on the operators of the aircraft, i.e. the pilots, is mainly considered, but it is not negligible that overload affects not only the aircraft movement but also the environmental control parts of the aircraft. An aircraft environmental control system is a complete set of equipment that ensures that the aircraft cabin and equipment compartment have the appropriate environmental conditions for the passengers and equipment to function properly. The temperature control system is an important part of an aircraft environment control system, and can reasonably control hot air and cold air to balance the heat load of a cabin so as to achieve the aim of controlling the temperature of the cabin. More importantly, with the development of scientific technology, the electronic devices on board modern airplanes are increased increasingly, and a large amount of heat is also generated, so that the temperature environment of the electronic devices is deteriorated, the cabin temperature is also greatly influenced, and the electronic devices must be cooled. The cooling of electronic equipment is an important problem in the control of the cabin temperature of an aircraft due to the high power consumption and high requirements. In order to ensure safe flight of an aircraft, various heat sources represented by electronic equipment need to be cooled, and a spray cooling technology is a common cooling technology. Based on the above two points, it is a key issue to investigate whether spray cooling can be effectively performed under an overload condition, and particularly, it is worth studying whether spray cooling can be performed well under an environment where an overload acceleration is large, that is, an unfavorable high overload condition. Different from ground equipment, when the airplane performs maneuvering flight (such as hovering flight), the onboard thermal control device is likely to overturn along with the movement of the airplane, so that the axis of the nozzle forms a certain angle with the gravity direction, and the angle is temporarily defined as a spraying angle; when the airplane changes the flight state (such as accelerating or decelerating flight), the onboard thermal control device is affected by overload from different directions. For a spray cooling system, the liquid film attached to the heat exchange surface has a remarkable influence on heat exchange. The change of the spray angle or the existence of the additional inertia force can affect the thickness, the flow speed, the flow form and the like of the liquid film on the heat exchange surface, and further affect the heat exchange performance of spray cooling.
The invention provides a method for observing the form of a spray cooling liquid film under adverse high overload, which is used for researching the cooling principle of spray cooling under adverse high overload and the influence of adverse high overload environment on cooling and provides a powerful support for evaluating the influence of airborne environment on spray cooling heat exchange. According to one aspect of the invention, a simulated observation system for an adverse high overload environment is provided for simulating an anticipated adverse high overload environment. As shown in fig. 1, according to an embodiment of the present invention, a simulated observation system for adverse high overload environment comprises:
an anti-overload pressure source portion (101, 102) for providing a stable working medium atomization pressure in a high overload environment; a spray cooling chamber section (103) for performing spray cooling heat exchange and recovering waste liquid; a liquid film observing and measuring part (104) for obtaining the local liquid film thickness of different observation points and the forming process and the flow form of the liquid film after the liquid drops impact the wall surface; a centrifugal test stand (105, 111, 107) for providing various adverse high overload acceleration environments; and the unfavorable high overload observation part is used for providing unfavorable high overload environments required by observation and carrying out spray observation under various unfavorable high overload environments. In one embodiment according to the present invention, the anti-overload pressure source part (101, 102), the spray cooling chamber part (103), and the liquid film observing and measuring part (104) are all simultaneously mounted on the cantilever (111) of the centrifugal test stand. As shown in fig. 2, the installation angles of a nozzle (202), a spray chamber wall (203) and a heat source (204) in a spray cooling chamber part (103) on a rotating arm (205) of a centrifugal tester are adjusted, and an included angle beta between a spray direction theta and overload acceleration a is controlled, so that horizontal overload unfavorable environment simulation, vertical overload unfavorable environment and vertical weightlessness overload unfavorable environment simulation are approximately realized; defining an included angle beta between the overload acceleration and the synthesized acceleration; an included angle between the spraying direction and the rotating arm is an installation angle theta; the included angle between the synthesized acceleration and the flowing direction of the liquid film is an overload angle beta; as shown in fig. 2(a), when θ ═ 90 °, β ≈ 0 °, the simulation level disadvantageously high overload environment; as shown in fig. 2(b), when θ ═ 180 ° - β, β ≈ 90 °, a vertical overweight unfavourable high overload environment is simulated; as shown in fig. 2(c), when θ ═ β, β ≈ 90 °, the simulated vertical weightlessness is unfavorable for high overload environments. As shown in fig. 3, an overload pressure source resisting portion of an overload spray cooling observation system according to an embodiment of the present invention includes: the device comprises a high-pressure gas cylinder (301), a pressure control valve (302), a safety valve (303), a gas bag cavity (304), a movable sealing surface (305), a cooling working medium tank (306), a check valve (307), a flow meter (308) and a filter (309). The device is used for ensuring that stable working medium atomization pressure is provided under a high overload environment.
As shown in fig. 4, a spray cooling section according to an embodiment of the present invention includes: the device comprises a cavity inlet liquid supply pipe (401), a spraying cavity (402), a nozzle (403), a heat tracing glass cover (404), a heat source (405), a vacuum pump (406) and a waste liquid tank (407), wherein the cavity inlet liquid supply pipe is used for carrying out spraying cooling heat exchange and recovering waste liquid; a liquid film observing and measuring section (104) including: the device comprises a dispersion confocal displacement sensor (507), a high-speed camera, a micro-amplification lens (505) and a green laser cold light source (506), wherein the dispersion confocal displacement sensor is used for acquiring the thickness of a local liquid film at different observation points and the forming process and the flow form of the liquid film after liquid drops impact the wall surface.
In one embodiment according to the present invention, as shown in fig. 3, high pressure air from a high pressure air bottle (301) enters into the air bag chamber (304) of the air bottle at a certain flow rate through a pressure control valve (302), the pressure in the chamber is controlled by the pressure control valve (302) and a safety valve (303) according to a set pressure, the gas in the inflatable balloon chamber (304) pushes the movable sealing surface (305) to move, thereby pushing the liquid working medium in the cooling working medium cavity (306) to flow out, the pressure of the cooling working medium is extruded by the movable sealing surface (305), therefore, the working medium is not influenced by an adverse high-overload environment, can stably flow out according to set pressure, the working medium is prevented from flowing back through the check valve (307), the liquid supply flow is measured through the flow meter (308), impurities are finally removed through the filter (309), the required cooling working medium is provided for a spray cooling part, and the defect that the pump directly provides the working medium in the adverse high-overload environment is overcome.
According to one embodiment of the invention, as shown in fig. 4, a stable cooling working medium (401) provided by an overload pressure resistant source is sprayed in a spray cavity (402) through a spray nozzle (403) to collide with the surface of a heat source (405) to generate heat exchange cooling, the cooling working medium subjected to heat exchange in the spray cavity (402) is collected at the bottom of the spray cavity (402) under the action of a heat tracing glass cover (404), and meanwhile, electric heating glass is arranged on two sides of the spray cavity to ensure that a shooting view field is not interfered by liquid drops splashed onto the heating glass for a long enough time, so that the observation and shooting quality is improved. The suction of the vacuum pump (406) enables the bottom of the spraying cavity (402) to generate negative pressure, so that no matter what kind of unfavorable high overload environment exists outside, the working medium after heat exchange can be sucked back into the liquid storage tank (407) to realize waste liquid collection, and the suction position of the waste liquid collection is related to the simulated unfavorable high overload environment.
According to one embodiment of the invention, as shown in fig. 5, a cooling working medium (501) is sprayed out through a spray nozzle (502), a liquid film is formed when liquid drops collide with the wall surface of a heat source (504) and is shot by a high-speed camera and a micro-magnifying lens (505), a green laser cold light source (506) provides light sources and enables shooting to be clearer, and local liquid film thickness observed quantity data of different observation points are obtained by using a dispersive confocal displacement sensor (507).
Compared with the traditional spray cooling liquid film observation method, the method has the advantages that:
(1) the pressure source part uses controllable air pressure to extrude the movable sealing plate in the gas-liquid tank, working media stably flow out by utilizing the pressure source part to extrude the working media, and the working media cannot be influenced no matter what adverse high overload environment is around, so that the stability of spraying is further ensured, and compared with the traditional method of directly adopting a pump, the influence of the high overload environment on the rotation of the pump and the like is avoided;
(2) the waste liquid recovery part adopts a glass cover to collect working media after heat exchange is finished, and the waste liquid is sucked into the liquid storage tank at the bottom of the spray cavity by utilizing negative pressure generated by vacuum pump suction, so that the influence of a high overload environment on pump rotation and the like is avoided directly compared with a method adopting pump suction;
(3) the liquid film observation and measurement part is provided with the electric heating glass at two sides of the spray cavity so as to ensure that the shooting visual field is not interfered by liquid drops splashed on the heating glass for a long time, the observation and shooting quality is improved, local liquid film thickness observation quantity data of different observation points are automatically obtained by using a dispersion confocal displacement sensor, the test difficulty is reduced, the reliability is ensured, and a green laser cold light source is used for ensuring that a clear picture is shot;
(4) the pressure source part, the spray cooling part and the liquid film observing and measuring part are all arranged on the centrifugal testing machine, the included angle between the spray direction and the overload acceleration can be controlled simply by adjusting the installation angle of the spray cooling part on the rotating arm of the centrifugal testing machine, the environmental simulation of horizontal adverse overload, vertical overweight adverse overload and vertical weightlessness adverse overload is approximately realized, and the operation is simple;
the invention has the advantages of
The pressure source part uses controllable air pressure to extrude the movable sealing plate in the gas-liquid tank, working media stably flow out by utilizing the pressure source part to extrude the working media, and the working media cannot be influenced no matter what adverse high overload environment is around, so that the stability of spraying is further ensured, and compared with the traditional method of directly adopting a pump, the influence of the high overload environment on the rotation of the pump and the like is avoided;
the waste liquid recovery part adopts a glass cover to collect working media after heat exchange is finished, and the waste liquid is sucked into the liquid storage tank at the bottom of the spray cavity by utilizing negative pressure generated by vacuum pump suction, so that the influence of a high overload environment on pump rotation and the like is avoided directly compared with a method adopting pump suction;
the liquid film observation and measurement part is provided with the electric heating glass at two sides of the spray cavity so as to ensure that the shooting visual field is not interfered by liquid drops splashed on the heating glass for a long time, the observation and shooting quality is improved, local liquid film thickness observation quantity data of different observation points are automatically obtained by using a dispersion confocal displacement sensor, the test difficulty is reduced, the reliability is ensured, and a green laser cold light source is used for ensuring that a clear picture is shot;
the pressure source part, the spray cooling part and the liquid film observing and measuring part are all arranged on the centrifugal testing machine, the included angle between the spray direction and the overload acceleration can be controlled simply by adjusting the installation angle of the spray cooling part on the rotating arm of the centrifugal testing machine, the environmental simulation of horizontal adverse overload, vertical overweight adverse overload and vertical weightlessness adverse overload can be approximately realized, and the operation is simple.
Claims (10)
1. An observation system for observing the form of an unfavorable high-overload spray cooling liquid film, which is used for providing an unfavorable high-overload environment required for observation and carrying out spray observation under various unfavorable high-overload environments, and is characterized by comprising:
the overload pressure source part is composed of a high-pressure gas cylinder (101) and a pressure-adjustable cooling working medium tank (102) and is used for ensuring that stable liquid working medium spraying atomization pressure is provided in a high overload environment;
a spray cooling chamber section (103, 502, 403) for performing spray cooling heat exchange and temporarily collecting spray waste liquid;
the spraying waste liquid active recovery part is used for recovering the spraying waste liquid;
a liquid film observing and measuring part (104) for obtaining the local liquid film thickness of different observation points and the forming process and the flow form of the liquid film after the liquid drops impact the wall surface;
a temperature signal measuring section (106) for recording temperature signals of different observation points;
and centrifugal test beds (105, 111, 107) for mounting the anti-overload pressure source parts (101 and 102), the spray cooling chamber part, the spray waste liquid active recovery part (108 and 109), the liquid film observation part (104) and the temperature signal measurement part (106).
2. The observation system for observing the form of the spray cooling liquid film with the unfavorable high overload according to claim 1, wherein:
the centrifugal test bed comprises a centrifugal motor (105), a rotating arm (111) and a balancing weight (107),
wherein
The centrifugal motor is used for driving the rotating arm to rotate so as to provide various unfavorable high overload acceleration environments,
the counterweight (107) is used for balancing the weight of the rotating arm to stabilize the rotation and ensure the observation quality,
the active recovery part of the spray waste liquid comprises a vacuum pump (108) and a waste liquid tank (109).
3. The observation system for observing the form of the spray cooling liquid film with the unfavorable high overload according to claim 1, wherein:
the spray cooling cavity part comprises a nozzle (202) arranged on a rotating arm (205) of the centrifugal testing machine, a spray cavity wall (203) and a heat source (204),
wherein
By adjusting the installation angle of the spray cooling chamber part and controlling the included angle beta between the spray direction theta and the overload acceleration a, the environment simulation of horizontal unfavorable overload, vertical overweight unfavorable overload and vertical weightlessness unfavorable overload is approximately realized, and the environment simulation method comprises the following steps:
when theta is equal to-90 degrees and beta is approximately equal to 0 degrees, the simulation level is unfavorable for high overload environment;
when theta is 180-beta and beta is approximately equal to-90 degrees, a vertical overweight unfavorable high overload environment is simulated;
when θ ═ β, β ≈ 90 °, the simulated vertical weightlessness is an unfavorably high overload environment.
4. The observation system for observing the form of the spray cooling liquid film with the unfavorable high overload according to claim 1, wherein:
the anti-overload pressure source section (101 and 102) includes: a high-pressure gas cylinder (301), a pressure control valve (302), a safety valve (303), a gas bag cavity (304), a movable sealing surface (305), a cooling working medium tank (306), a check valve (307), a flowmeter (308) and a filter (309),
wherein,
high-pressure air from a high-pressure air bottle (301) enters an expandable air bag cavity (304) at the upper part of a cooling working medium tank (306) at a certain flow rate through a pressure control valve (302),
the pressure in the inflatable air bag cavity (304) is controlled by a pressure control valve (302) and a safety valve (303) according to the set pressure, the gas in the inflatable air bag cavity (304) pushes the movable sealing surface (305) to move, and further pushes the liquid working medium in the cooling working medium tank (306) to flow out,
the pressure of the cooling working medium is extruded by the movable sealing surface (305), so that the cooling working medium is not influenced by adverse high-overload environment and can stably flow out according to the set pressure,
the working medium is prevented from flowing back through a check valve (307), the flow of the liquid supply is measured through a flow meter (308), and finally impurities are removed through a filter (309) to provide the cooling working medium with required stable pressure for the spray cooling part.
5. The observation system for observing the form of the spray cooling liquid film with the unfavorable high overload according to claim 1, wherein:
the spray cooling chamber part comprises: a cavity liquid supply pipe (401), a spraying cavity (402), a nozzle (403), a heat tracing glass cover (404), a heat source (405), a vacuum pump (406) and a waste liquid tank (407),
wherein,
the cavity liquid supply pipe (401) and the spray nozzle (403) are used for spraying stable cooling working medium from the overload pressure resisting source part on a hot surface (408) in the spray cavity (402) to collide with the surface (408) of the heat source (405) to generate cooling effect,
the heat tracing glass cover (404) is used for collecting the cooling working medium after heat exchange in the spraying cavity (402) at the bottom of the spraying cavity (402),
the vacuum pump (406) is used for generating negative pressure at the bottom of the spraying cavity (402), so that the working medium after heat exchange is pumped back to the waste liquid tank (407), and waste liquid collection is realized.
6. The observation system for observing the form of the spray cooling liquid film with the unfavorable high overload according to claim 1, wherein:
the liquid film observing and measuring section (104) includes: a dispersion confocal displacement sensor (507), a high-speed camera + micro-amplifying lens (505), a green laser cold light source (506),
wherein,
the cooling working medium (501) is sprayed out through the nozzle (502), the liquid drops collide the wall surface of the heat source (504) to form a liquid film, the liquid film is shot by the high-speed camera and the micro-amplifying lens (505), the green laser cold light source (506) provides light sources and enables the shooting to be clearer, and the dispersion confocal displacement sensor (507) is used for obtaining local liquid film thickness observed quantity data of different observation points.
7. The unfavorable high overload spray cooling liquid film morphology observation method based on the unfavorable high overload spray cooling liquid film morphology observation system according to claim 1, characterized in that:
the centrifugal test bed comprises a centrifugal motor (105), a rotating arm (111) and a balancing weight (107), the active spray waste liquid recycling part comprises a vacuum pump (108) and a waste liquid tank (109),
and the method comprises:
the centrifugal motor is used for driving the rotating arm to rotate so as to provide various unfavorable high overload acceleration environments,
the weight of the rotating arm is balanced by a balance weight (107) to ensure stable rotation and observation quality.
8. The unfavorable high overload spray cooling liquid film morphology observation method based on the unfavorable high overload spray cooling liquid film morphology observation system according to claim 1, characterized in that:
the spray cooling cavity part comprises a nozzle (202) arranged on a rotating arm (205) of the centrifugal testing machine, a spray cavity wall (203) and a heat source (204),
and the method comprises:
by adjusting the installation angle of the spray cooling chamber part and controlling the included angle beta between the spray direction theta and the overload acceleration a, the environment simulation of horizontal unfavorable overload, vertical overweight unfavorable overload and vertical weightlessness unfavorable overload is approximately realized, and the environment simulation method comprises the following steps:
when theta is equal to-90 degrees and beta is approximately equal to 0 degrees, the simulation level is unfavorable for high overload environment;
when theta is 180-beta and beta is approximately equal to-90 degrees, a vertical overweight unfavorable high overload environment is simulated;
when θ ═ β, β ≈ 90 °, the simulated vertical weightlessness is an unfavorably high overload environment.
9. The unfavorable high overload spray cooling liquid film morphology observation method based on the unfavorable high overload spray cooling liquid film morphology observation system according to claim 1, characterized in that:
the anti-overload pressure source section (101 and 102) includes: a high-pressure gas cylinder (301), a pressure control valve (302), a safety valve (303), a gas bag cavity (304), a movable sealing surface (305), a cooling working medium tank (306), a check valve (307), a flowmeter (308) and a filter (309),
and the method comprises:
high-pressure air from a high-pressure air bottle (301) enters an expandable air bag cavity (304) at the upper part of a cooling working medium tank (306) at a certain flow rate through a pressure control valve (302),
the pressure in the expandable air sac cavity (304) is controlled by a pressure control valve (302) and a safety valve (303) according to the set pressure, the gas in the expandable air sac cavity (304) is used for pushing the movable sealing surface (305) to move, and further the liquid working medium in the cooling working medium tank (306) is pushed to flow out,
the pressure of the cooling working medium is applied by the extrusion of the movable sealing surface (305), so that the pressure applied to the cooling working medium is not influenced by the adverse high overload environment and can stably flow out according to the set pressure,
the cooling medium is prevented from flowing back by a check valve (307),
measuring the flow rate of the liquid supply in the cooling medium by a flow meter (308),
the impurities in the cooling medium are removed by a filter (309) to provide the cooling medium with a desired stable pressure to the spray cooling section.
10. The unfavorable high overload spray cooling liquid film morphology observation method based on the unfavorable high overload spray cooling liquid film morphology observation system according to claim 1, characterized in that:
the spray cooling cavity part comprises a cavity inlet liquid supply pipe (401), a spray cavity (402), a nozzle, a heat tracing glass cover (404), a heat source (405), a vacuum pump (406) and a waste liquid tank (407),
and the method comprises:
the stable cooling working medium from the overload-resistant pressure source part is sprayed on the hot surface (408) in the spraying cavity (402) by the cavity feeding pipe (401) and the nozzle to collide with the surface (408) of the heat source (405) to generate cooling effect,
a heat tracing glass cover (404) is used for collecting the cooling working medium after heat exchange in the spraying cavity (402) at the bottom of the spraying cavity (402),
and a vacuum pump (406) is used for generating negative pressure at the bottom of the spraying cavity (402), so that the working medium after heat exchange is pumped back to the waste liquid tank (407), and waste liquid collection is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510580436.7A CN105203545B (en) | 2015-09-11 | 2015-09-11 | A kind of unfavorable high overload misting cooling liquid film form observation system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510580436.7A CN105203545B (en) | 2015-09-11 | 2015-09-11 | A kind of unfavorable high overload misting cooling liquid film form observation system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105203545A true CN105203545A (en) | 2015-12-30 |
| CN105203545B CN105203545B (en) | 2018-02-09 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107068873A (en) * | 2016-12-27 | 2017-08-18 | 青岛黑金热工能源有限公司 | Device and method for preparing perovskite solar cell |
| CN106092506B (en) * | 2016-08-01 | 2018-06-12 | 西北工业大学 | High speed droplet/wall surface liquid film angular impact experimental rig |
| CN113281588A (en) * | 2021-04-28 | 2021-08-20 | 南京航空航天大学 | Swing spray cooling experimental apparatus |
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| CN101410706A (en) * | 2005-07-27 | 2009-04-15 | 密苏里大学管理者 | Focused droplet nebulizer for evaporative light scattering detector |
| US20100024468A1 (en) * | 2006-10-13 | 2010-02-04 | Carrier Corporation | Refrigeration unit comprising a micro channel heat exchanger |
| CN201880631U (en) * | 2010-10-29 | 2011-06-29 | 深圳市树立水处理设备有限公司 | Continuous spraying device |
| CN102648041A (en) * | 2009-11-24 | 2012-08-22 | 基伊埃工程技术股份有限公司 | A method of monitoring a spray dryer and a spray dryer comprising one or more infrared cameras |
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| CN101410706A (en) * | 2005-07-27 | 2009-04-15 | 密苏里大学管理者 | Focused droplet nebulizer for evaporative light scattering detector |
| US20100024468A1 (en) * | 2006-10-13 | 2010-02-04 | Carrier Corporation | Refrigeration unit comprising a micro channel heat exchanger |
| CN102648041A (en) * | 2009-11-24 | 2012-08-22 | 基伊埃工程技术股份有限公司 | A method of monitoring a spray dryer and a spray dryer comprising one or more infrared cameras |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092506B (en) * | 2016-08-01 | 2018-06-12 | 西北工业大学 | High speed droplet/wall surface liquid film angular impact experimental rig |
| CN107068873A (en) * | 2016-12-27 | 2017-08-18 | 青岛黑金热工能源有限公司 | Device and method for preparing perovskite solar cell |
| CN113281588A (en) * | 2021-04-28 | 2021-08-20 | 南京航空航天大学 | Swing spray cooling experimental apparatus |
| CN113281588B (en) * | 2021-04-28 | 2022-04-08 | 南京航空航天大学 | Swing spray cooling experimental apparatus |
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| CN105203545B (en) | 2018-02-09 |
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