CN108828001B - Single-droplet evaporation experimental device - Google Patents
Single-droplet evaporation experimental device Download PDFInfo
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- CN108828001B CN108828001B CN201810661201.4A CN201810661201A CN108828001B CN 108828001 B CN108828001 B CN 108828001B CN 201810661201 A CN201810661201 A CN 201810661201A CN 108828001 B CN108828001 B CN 108828001B
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Abstract
The embodiment of the invention provides a single-droplet evaporation experimental device which comprises a first cavity and a second cavity, wherein the first cavity is arranged right above the second cavity and is communicated with the second cavity through a vertical pore channel. A liquid drop generating module is arranged in the first cavity and used for generating single liquid drops with good consistency and enabling the single liquid drops to drop to the second cavity through the pore channel under the action of gravity; and a quartz hanging wire is arranged in the second cavity, is arranged below the lower opening of the pore passage and is used for hanging the single liquid drop dripped from the first cavity. Because the single liquid drop drops from the first cavity, any cavity does not need to be opened to send the single liquid drop into the first cavity, and the problems of accurate generation and suspension of the liquid drop in a high-pressure environment are solved. And because any cavity does not need to be opened, the temperature and pressure environment in the cavity cannot be interfered, and the generation precision of the single liquid drop is greatly improved.
Description
Technical Field
The invention relates to the technical field of internal combustion gas, in particular to a single-droplet evaporation experimental device.
Background
With the increasing shortage of fossil energy and the pressure of environmental protection, energy conservation and emission reduction become core ideas of environmental protection policy and regulation made by governments of various countries. Under the promotion of the idea, researchers in the field of engines successively put forward advanced engine technologies such as advanced supercharging technology, high-pressure injection technology, optimized combustion and the like. When the internal combustion engine applies the advanced engine technologies, the internal combustion engine generates higher in-cylinder temperature and in-cylinder pressure without exception, and the change of the in-cylinder environment changes the fuel evaporation and oil-gas mixing process, so that research on the fuel evaporation process in the complex in-cylinder high-temperature and high-pressure environment is necessary.
The inventor of the application finds out through research that the evaporation process of the in-cylinder fuel is actually the evaporation process of a plurality of discrete droplets for the spray combustion engine, and based on the fact, the evaporation process of the in-cylinder fuel can be simplified into the atomization evaporation research of a single droplet, namely, the research on the evaporation process of the fuel is realized by taking the single droplet as a research object.
The existing single-droplet evaporation experimental device mainly produces single droplets by a hanging droplet method, when in experiment, experimenters need to utilize a micro-injector to manually generate droplets and finish the suspension of the droplets, and the suspended droplets are sent into a high-temperature environment after the suspension is finished. However, if the method of artificially generating and suspending the liquid droplets is used under a high-pressure environment, the research on the evaporation of the single liquid droplet under the high-pressure environment cannot be carried out.
Disclosure of Invention
In view of this, the invention provides a single-droplet evaporation experimental device, which is used for solving the problem that the single droplet is difficult to generate and hang under the high-temperature and high-pressure environment at present.
In order to solve the problems, the invention discloses a single-droplet evaporation experimental device, which comprises a first cavity and a second cavity, wherein the first cavity is arranged right above the second cavity and is communicated with the second cavity through a vertical pore channel, and the single-droplet evaporation experimental device comprises:
a liquid drop generating module is arranged in the first cavity and used for generating single liquid drops, and the single liquid drops are made to drop to the second cavity through the pore channel under the action of gravity;
and a quartz hanging wire is arranged in the second cavity, is arranged below the lower opening of the pore passage and is used for hanging the single liquid drop dripped from the first cavity.
Optionally, an oil bottle for supplying oil to the droplet generation module is disposed inside the first cavity.
Optionally, a preset pressure is maintained in both the first cavity and the second cavity;
a first temperature is maintained in the first cavity, and a second temperature is maintained in the second cavity, wherein the second temperature is far higher than the first temperature.
Optionally, an electric heating module is arranged in the second cavity, and the electric heating module is used for keeping the second temperature in the second cavity.
Optionally, a valve is arranged on the outer wall of the second cavity, wherein:
the valve is connected with a high-pressure gas cylinder for supplying pressure to the second cavity.
Optionally, a cavity is arranged inside the connecting flange for connecting the first cavity and the second cavity, and cooling water is contained in the cavity.
Optionally, the cooling water circulation module is further included, a water inlet and a water outlet which are used for communicating the cavity with the outside are arranged on the connecting flange, a cooling water outlet of the cooling water circulation module is communicated with the water inlet, and a cooling water inlet is communicated with the water outlet.
Optionally, a transparent window is set on the side wall of the second cavity at a position facing the quartz hanging wire.
Optionally, a multi-degree-of-freedom displacement table is arranged in the first cavity, and the liquid drop generation module is arranged on the multi-degree-of-freedom displacement table; the multi-degree-of-freedom displacement table is used for driving the liquid drop generation module to move relative to the pore channel.
Optionally, the droplet generation module includes a cavity communicated with the oil bottle, and a dropper located below the cavity and communicated with the cavity, a pipe orifice with a preset diameter is provided at the lower end of the dropper, a piezoelectric ceramic piece is provided at the upper part of the cavity, and the piezoelectric ceramic piece is used for extruding the cavity under the control of an input square wave, so that liquid in the cavity is discharged from the pipe orifice to form the single droplet.
According to the technical scheme, the single-droplet evaporation experimental device comprises a first cavity and a second cavity, wherein the first cavity is arranged right above the second cavity and is communicated with the second cavity through a vertical pore channel. A liquid drop generating module is arranged in the first cavity and used for generating single liquid drops, and the single liquid drops are made to drop to the second cavity through the pore channel under the action of gravity; and a quartz hanging wire is arranged in the second cavity, is arranged below the lower opening of the pore passage and is used for hanging the single liquid drop dripped from the first cavity. Because the single liquid drop drops from the first cavity, the second cavity does not need to be opened to send the single liquid drop into the first cavity, the high-pressure environment of the two cavities is not affected, and the problem that the single liquid drop is difficult to generate and hang under the high-pressure environment can be solved.
. In addition, any cavity does not need to be opened, so that the temperature and pressure environment in any cavity cannot be influenced, the experimental precision is improved, and the precision of single-drop generation can be greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a single-droplet evaporation experimental apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a droplet generation module according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a single-droplet evaporation experimental apparatus according to an embodiment of the present invention.
Referring to fig. 1, the single-droplet evaporation experimental apparatus provided in this embodiment is used for studying evaporation of a single droplet of fuel, and is used for obtaining a stable and controllable single droplet under a preset pressure and a preset temperature environment.
The single-droplet evaporation experimental device comprises two vertically-installed cavities which are sealed from the outside, namely a first cavity 10 and a second cavity 20, wherein the first cavity is arranged right above the second cavity, the two cavities are communicated through a vertical pore passage 30, and the pore passage can be formed by one part of the first cavity or one part of the second cavity.
The first cavity is communicated with the second cavity through the pore canal, so that an isobaric whole is formed, namely the air pressure in the first cavity is the same as that in the second cavity, and different pressure levels can be realized under the operation of corresponding equipment, namely the preset pressure required by a user is kept.
Moreover, because the diameter of the pore passage between the two cavities is small, the two cavities can be kept at different temperatures, for example, a first temperature can be kept in the first cavity, and a second temperature can be kept in the second cavity. Because the first cavity is used for generating the single liquid drops and the single liquid drops are required to be prevented from evaporating, the first cavity is required to be kept at a lower temperature, and the first temperature of the first cavity can be kept at a normal temperature, namely the ambient temperature, for convenience of operation.
The evaporation test needs to be carried out in the second cavity, so that the single liquid drop entering the second cavity is evaporated, and therefore the second cavity needs to keep higher temperature, namely the temperature for realizing evaporation is met, and therefore the second temperature of the second cavity is higher than the first temperature at least or is far higher than the first temperature.
In order to make the temperature in the second cavity reach the second temperature required for evaporating the single liquid drop, a corresponding electric heating module is arranged in the second cavity, the electric heating module specifically comprises a plurality of electric heating rods 40 arranged in the second cavity, and a temperature controller (not shown) for supplying power to the electric heating rods and realizing temperature control is arranged outside the second cavity. The temperature controller collects the temperature in the second cavity by using a thermocouple, and controls the electric heating rod according to the collected temperature value.
A droplet generation module 50 for generating a single droplet is arranged in the first cavity, and the single droplet is generated, then drops from the module, and drops downwards from the pore channel through the pore channel under the action of gravity. In the second cavity is arranged
The quartz wire 60 can have other shapes. The quartz hanging wire is arranged below the lower opening of the pore passage, and the central part of the quartz hanging wire corresponds to the central part of the pore passage, so that single liquid drops dropping from the pore passage can be received and hung at the central part of the quartz hanging wire.
The single liquid drop is evaporated under the action of thermal force on the quartz hanging wire positioned in the second cavity, the evaporation process is shot through the camera equipment, and the research on the evaporation process of the single liquid drop can be realized by utilizing the image obtained by shooting. In order to shoot the evaporation process, a corresponding transparent window 21 can be arranged on the side wall of the second cavity and at a position right opposite to the quartz hanging wire, so that the shooting equipment can shoot the evaporation process of the single liquid drop through the transparent window.
According to the technical scheme, the single-droplet evaporation experimental device comprises a first cavity and a second cavity, wherein the first cavity is arranged right above the second cavity and communicated with the second cavity through a vertical pore channel. A liquid drop generating module is arranged in the first cavity and used for generating single liquid drops, and the single liquid drops are made to drop to the second cavity through the pore channel under the action of gravity; and a quartz hanging wire is arranged in the second cavity, is arranged below the lower opening of the pore passage and is used for hanging the single liquid drop dripped from the first cavity. Because the single liquid drop drops from the first cavity, the second cavity does not need to be opened to send the single liquid drop into the first cavity, the high-pressure environment of the two cavities is not affected, and the problem that the single liquid drop is difficult to generate and hang under the high-pressure environment can be solved.
In addition, any cavity does not need to be opened, so that the temperature and pressure environment in any cavity cannot be influenced, the experimental precision is improved, and the precision of single-drop generation can be greatly improved. In order to maintain the high pressure required for the user to perform the experiment in the isolated environment, a first valve (not shown) is provided on the outer wall of the second chamber, and the first valve is connected to a high pressure gas cylinder for supplying gas to the second chamber or the isolated environment. In addition, a second valve (not shown) for air release may be provided on the outer wall of the second chamber.
In one embodiment of this embodiment, in order to ensure the sealing performance of the first cavity and avoid the need of supplying oil to the droplet generation module in the first cavity in a pressurization manner, in addition to the droplet generation module, an oil bottle 11 for supplying oil to the droplet generation module is also provided in the first cavity, and the oil bottle is communicated with the droplet generation module through a conduit.
The oil bottle and the liquid drop generating module are arranged in the same pressure environment, so that the ambient pressure of an inlet and an outlet is always consistent, the single liquid drop is generated without being influenced by the external ambient pressure, and the consistency of the single liquid drop is ensured.
As shown in fig. 2, the liquid drop generating module includes a cavity 51 communicated with the oil bottle, a dropper 52 is connected below the cavity, the lower end of the dropper is a pipe orifice 53 with a preset diameter, and a piezoelectric ceramic plate 54 is arranged at the upper part of the cavity. The piezoelectric ceramic plate is connected with a signal output device (not shown) which is used for outputting square wave signals according to experiment requirements, and the piezoelectric ceramic plate extrudes the cavity under the control of the input square wave signals, so that liquid in the cavity is discharged from the pipe orifice to form single liquid drops.
According to different requirements, the pipe orifices with different specifications can be replaced, so that the size of the single liquid drop meets the experimental requirements. I.e. the nozzle of the droplet generation module of the present application is a replaceable component.
The first and second chambers are connected by a connecting flange 70, inside which a cavity 71 is provided. As can be seen from the foregoing description, the operating temperature of the first chamber is close to normal temperature, while the temperature in the second chamber is much higher than the temperature in the first chamber. Since the two cavities are tightly connected to form a whole, the high temperature in the second cavity inevitably affects the first cavity, thereby causing the first temperature in the first cavity to rise.
In order to control the temperature rise of the first temperature as much as possible, namely to reduce the influence of the temperature in the second cavity on the temperature in the first cavity as much as possible, cooling liquid can be introduced into the cavity of the connecting flange, and the cooling liquid is cold water.
In addition, the device also comprises a cooling water circulation module 80 for circulating cooling water, wherein a cooling water outlet of the cooling water circulation module is communicated with a water inlet of the cavity of the connecting flange through a corresponding pipeline, a cooling water inlet of the module is communicated with a water outlet of the cavity through a corresponding pipeline, and the cooling water can circulate outside and inside the connecting flange after the module is started.
In another embodiment of the present application, a multi-degree-of-freedom displacement stage 90 for fixing the droplet generation module is further disposed in the first cavity, and the multi-degree-of-freedom displacement stage can drive the droplet generation module to move relative to the pore channel under the operation of a user. Because the size of the generated single liquid drop is very small, the relative position of the liquid drop generating device and the quartz hanging wire can be adjusted by moving the liquid drop generating device, and therefore accurate suspension is achieved.
Specifically, the multi-degree-of-freedom displacement table can be a two-degree-of-freedom displacement table, namely, the multi-degree-of-freedom displacement table can drive the liquid drop generation module to move along an x axis and a y axis in a plane; or a three-degree-of-freedom displacement platform, and the liquid drop generation module is driven to move in a plane and also can vertically move along a z axis relative to the plane, so that the distance between the liquid drop generation module and the pore channel can be adjusted.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The technical solutions provided by the present invention are described in detail above, and the principle and the implementation of the present invention are explained in this document by applying specific examples, and the descriptions of the above examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (6)
1. The utility model provides a single drop evaporation experimental apparatus, its characterized in that includes first cavity and second cavity, first cavity sets up directly over the second cavity, and is linked together through a vertical pore, wherein:
a liquid drop generating module is arranged in the first cavity and used for generating single liquid drops, and the single liquid drops are made to drop to the second cavity through the pore channel under the action of gravity;
a quartz hanging wire is arranged in the second cavity, is arranged below the lower opening of the pore passage and is used for hanging the single liquid drop dropping from the first cavity;
wherein a first temperature is maintained in the first cavity, a second temperature is maintained in the second cavity, the second temperature is far higher than the first temperature, and preset pressures are maintained in the first cavity and the second cavity;
a cavity is arranged inside the connecting flange for connecting the first cavity and the second cavity, and cooling water is contained in the cavity;
a multi-degree-of-freedom displacement table is arranged in the first cavity, and the liquid drop generation module is arranged on the multi-degree-of-freedom displacement table; the multi-degree-of-freedom displacement table is used for driving the liquid drop generation module to move relative to the pore canal, and an electric heating module is arranged in the second cavity and used for keeping the second temperature in the second cavity.
2. The single-droplet evaporation experimental apparatus of claim 1, wherein an oil bottle for supplying oil to the droplet generation module is disposed inside the first cavity.
3. The single-droplet evaporation assay device of claim 1, wherein a valve is disposed on an outer wall of the second chamber, wherein:
the valve is connected with a high-pressure gas cylinder for supplying pressure to the second cavity.
4. The single-droplet evaporation experimental apparatus according to claim 1, further comprising a cooling water circulation module, wherein the connecting flange is provided with a water inlet and a water outlet for communicating the cavity with the outside, a cooling water outlet of the cooling water circulation module is communicated with the water inlet, and a cooling water inlet is communicated with the water outlet.
5. The single-drop evaporation experimental apparatus according to claim 1, wherein a transparent window is provided on a side wall of the second chamber at a position facing the quartz suspension wire.
6. The single-droplet evaporation experimental apparatus as claimed in claim 1, wherein the droplet generation module comprises a cavity communicated with the oil bottle, and a dropper located below the cavity and communicated with the cavity, wherein a nozzle with a preset diameter is arranged at the lower end of the dropper, and a piezoelectric ceramic plate is arranged at the upper part of the cavity and used for squeezing the cavity under the control of an input square wave, so that the liquid in the cavity is discharged from the nozzle to form the single droplet.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810661201.4A CN108828001B (en) | 2018-06-25 | 2018-06-25 | Single-droplet evaporation experimental device |
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| CN201810661201.4A CN108828001B (en) | 2018-06-25 | 2018-06-25 | Single-droplet evaporation experimental device |
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| CN108828001A CN108828001A (en) | 2018-11-16 |
| CN108828001B true CN108828001B (en) | 2021-04-13 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111122575A (en) * | 2019-12-31 | 2020-05-08 | 浙江大学 | Device for on-line monitoring space evaporation characteristic of micro-droplets in high-temperature airflow |
| CN112710692A (en) * | 2020-12-22 | 2021-04-27 | 西安交通大学 | Method and device for generating high-temperature and high-pressure micro-droplets and testing evaporation characteristics |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6089081A (en) * | 1998-01-27 | 2000-07-18 | Siemens Canada Limited | Automotive evaporative leak detection system and method |
| CN103308662B (en) * | 2013-06-07 | 2015-07-08 | 北京理工大学 | High-temperature and high-pressure single-drop evaporating and burning device |
| CN107202697B (en) * | 2016-09-08 | 2019-04-19 | 江苏科技大学 | A kind of high turbulent flow list drop evaporation test device of high temperature and pressure and its method |
| CN107045037A (en) * | 2017-03-10 | 2017-08-15 | 同济大学 | A kind of suspension type list droplet burning system |
| CN108169406A (en) * | 2017-12-15 | 2018-06-15 | 大连理工大学 | A kind of high temperature and pressure lubricating oil list drop evaporation and catch fire device and its application method |
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