High-temperature and high-pressure droplet evaporation test device and method

Abstract

The invention discloses a high-temperature and high-pressure droplet evaporation test device and method.The simulation device comprises a test shell, an evaporation chamber main body, an evaporation chamber driving part, a heating part, a hook hanging wire and a damping mechanism, an evaporation chamber inner cavity is formed in the evaporation chamber main body, and an opening communicating with the evaporation chamber inner cavity is formed in the lower end face of the evaporation chamber main body; an annular porous fin used for restraining heat convection is detachably installed in an inner cavity of the evaporation chamber. The evaporation chamber body is heated through electromagnetic induction and then moved to be connected to the outer side of liquid drops in a sleeving mode, under the structural design of the evaporation chamber body and cooperation of the annular porous fins, heat convection is not prone to causing heat and gas loss, the pressure and the temperature can easily reach the test pressure and the test temperature, the test efficiency is remarkably improved, and the test cost is reduced. And the pressure and the temperature in the inner cavity of the evaporation chamber are more stable, so that the test pressure and the test temperature meeting the test requirements are provided for the liquid drops, and the test accuracy can be further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid droplet evaporation testing, and in particular to a high-temperature and high-pressure liquid droplet evaporation testing device and method. Background Art

[0002] With the advancement of science and technology, space exploration has become increasingly in-depth, and rocket technology has also continued to advance. Liquid rocket engines convert the chemical energy of a vehicle's liquid propellant into kinetic energy, providing the necessary propulsion for flight. Studying the combustion process of liquid propellant within the engine's thrust chamber is crucial for improving engine performance, stability, and other parameters.

[0003] Among the existing droplet evaporation test devices, a typical experimental device adopts a split design, that is, droplets are generated in a room temperature and high pressure environment outside the evaporation chamber body (the liquid viscosity is relatively high under room temperature conditions and can be suspended on the top of the hanging wire). When the required high temperature and high pressure conditions are reached inside the evaporation chamber body, the droplets are quickly moved into the evaporation chamber body for experiments. However, during the heating process of the evaporation chamber body, the heat inside the evaporation chamber body will diffuse to the outside of the evaporation chamber body. Especially in the ultra-high pressure environment, the thermal conductivity of the gas increases rapidly, and the rate of heat diffusion to the outside of the evaporation chamber body increases significantly, causing the temperature outside the evaporation chamber body to increase significantly, resulting in difficulty in generating droplets outside the evaporation chamber body. Therefore, the temperature inside the evaporation chamber body of the existing split droplet evaporation experimental device under ultra-high pressure (5-10MPa) environment generally does not exceed 300°C, which is unable to achieve the high temperature and high pressure environment required for the droplet evaporation experiment, limiting the acquisition of scientific research experimental data and resulting in slow progress in related basic research.

[0004] The existing experimental device has the problem of not being able to raise the temperature. Since the observation and droplets need to be moved quickly into the evaporation chamber body, the evaporation chamber body cannot be fully insulated. For example, the observation window and the droplet inlet and outlet cannot be kept warm. The fundamental reason is that the heating power of the evaporation chamber body is too low, resulting in a slow heating rate (that is, the heating time is too long). Since the thermal conductivity of the gas under ultra-high pressure increases significantly, and the heating time is too long, the heat diffused to the outside of the evaporation chamber body increases significantly. Therefore, the temperature inside the evaporation chamber body cannot reach a very high level. In order to avoid heat loss, the evaporation chamber body needs to be made as small as possible. The contradiction is that heating used to be done by resistance wire. The small volume can accommodate fewer resistance wires, and too thin resistance wires are easy to burn out, so the heating power that can be provided is limited.

[0005] Furthermore, during the heating process of the evaporation chamber, the temperature of its walls rises rapidly. Because the gas inside the chamber is not directly heated, and the heat transfer from the chamber to the gas is slow, the gas temperature rise rate inside the chamber is much slower than the temperature rise rate of the chamber walls. This results in a significant temperature difference between the gas inside the chamber and the chamber walls. This temperature nonuniformity causes severe natural convection within the chamber, affecting the droplet evaporation process and resulting in experimental results that are not accurate enough to meet research needs.

[0006] Therefore, it is urgent to provide a high-temperature and high-pressure droplet evaporation test device and method to solve the above problems. Summary of the Invention

[0007] The purpose of the present invention is to provide a high-temperature and high-pressure droplet evaporation test device and method to simulate the liquid evaporation test under ultra-high temperature and ultra-high pressure environment to solve the shortcomings mentioned in the background technology.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] A high-temperature and high-pressure droplet evaporation test device, comprising:

[0010] The test housing has a built-in heating station and a test station, and the heating station is coaxially distributed directly above the test station;

[0011] The evaporation chamber body is arranged in the test shell, and has an evaporation chamber inner cavity therein. The lower end surface of the evaporation chamber body is provided with an opening communicating with the evaporation chamber inner cavity. An annular porous fin for suppressing heat convection is detachably installed in the evaporation chamber inner cavity.

[0012] The evaporation chamber driving member is arranged above the heating station and is used to drive the evaporation chamber body to move vertically between the heating station and the test station;

[0013] A heating element is fixed in the test shell and corresponds to the heating station, and is used to heat the evaporation chamber body entering the heating station;

[0014] A hook wire is vertically suspended in the test shell and corresponds to the test station. The input end of the hook wire is provided with a propellant delivery mechanism for delivering droplets, and an observation channel is provided on the outer side of the end of the hook wire.

[0015] The shock absorbing mechanism is installed below the evaporation chamber body and is used to absorb the impact force of the movement of the evaporation chamber body.

[0016] As a preferred embodiment of the present invention, the propellant delivery mechanism includes a filling pipe and a filler, the filling pipe is fixed to the test shell, the filler output end is connected to the filling pipe input end, and the filling pipe output end extends to the inner cavity of the evaporation chamber and is connected to the hook wire input end;

[0017] The hook hanging wire is configured as an inverted J-shaped circular tube, and an output end of the hook hanging wire is provided with a hanging ball for hanging droplets.

[0018] As a preferred embodiment of the present invention, a through hole is provided at the axis center of the annular porous fin, which is coaxial with the opening and has the same inner diameter as the opening, so that the end of the hook wire passes through the opening and the through hole;

[0019] The number of the annular porous fins is set to be multiple, and the multiple annular porous fins are distributed in parallel on the inner wall of the evaporation chamber body, and the annular porous fins avoid the coverage area of the transparent opening of the evaporation chamber.

[0020] As a preferred embodiment of the present invention, the observation channel includes a shell transparent port and an evaporation chamber transparent port, wherein the shell transparent port is arranged on two side walls of the test shell corresponding to the height of the test station, and the evaporation chamber transparent port is arranged on two side walls of the evaporation chamber body;

[0021] When the evaporation chamber body moves to the test station, the shell transparent opening and the evaporation chamber transparent opening are coaxially distributed, and the hanging ball is located on the axis connecting the shell transparent openings on both sides.

[0022] As a preferred solution of the present invention, the evaporation chamber body is made of solid metal material, and its outer wall is wrapped with an evaporation chamber insulation layer, and the evaporation chamber insulation layer moves synchronously with the evaporation chamber body;

[0023] A first hole corresponding to the transparent opening of the evaporation chamber is opened on the outside of the evaporation chamber insulation layer, and a second hole corresponding to the opening is opened on the bottom of the evaporation chamber insulation layer.

[0024] As a preferred embodiment of the present invention, the evaporation chamber driving member includes a cylinder, which is fixedly mounted on the test shell, and the cylinder rod end of the cylinder is detachably mounted to the top wall of the evaporation chamber body by bolts, and the connecting end of the cylinder is provided with a pneumatic mechanism for providing driving force.

[0025] The ultra-high temperature and high pressure environment simulation device for droplet evaporation test further comprises a shell insulation layer, which is sleeved on the outside of the heating element;

[0026] The heating element includes an electromagnetic coil, and the electromagnetic coil is distributed around the outer periphery of the evaporation chamber body located at the heating station.

[0027] As a preferred embodiment of the present invention, the shock absorbing mechanism includes:

[0028] Linear bearings, the number is at least two, and multiple linear bearings are fixed in the test housing;

[0029] The number of guide rods is the same as that of linear bearings, and multiple guide rods are fixedly installed on the lower end surface of the evaporation chamber body, and the guide rods correspond to the linear bearings one by one and slide in the vertical direction;

[0030] The shock-absorbing spring is sleeved on the outside of the guide rod and is located between the linear bearing and the lower end surface of the evaporation chamber body.

[0031] The ultra-high temperature and high pressure environment simulation device for droplet evaporation test also includes a blow-off pipe, which is located on one side of the bent hook hanging wire and can be detachably installed on the test shell. The two ends of the test shell are respectively located on the inner and outer sides of the test shell. The end of the blow-off pipe located outside the test shell is connected to the air source. During the process of moving the evaporation chamber main body from the heating station to the test station, the top end of the blow-off pipe enters the inner cavity of the evaporation chamber through the opening.

[0032] The droplet evaporation test simulation method is operated using an ultra-high temperature and high pressure environment simulation device for droplet evaporation test. The steps are as follows:

[0033] S100, pressurizing the test shell so that the pressure inside the evaporation chamber reaches the test pressure;

[0034] S200, heating the evaporation chamber body at a heating station so that the temperature of the inner cavity of the evaporation chamber reaches the test temperature;

[0035] S300, squeezing the liquid droplets toward the hook hanging wire so that the liquid droplets are held on the hanging balls of the hook hanging wire;

[0036] S400, moving the evaporation chamber body to the test station so that the hook wire enters the inner cavity of the evaporation chamber, and observing and recording the changes of the droplets held on the hook wire;

[0037] S500: After the test droplet evaporation simulation is completed, air is blown into the inner cavity of the evaporation chamber body 200 located at the test station to clean the inner wall of the evaporation chamber body and cool the inner cavity of the evaporation chamber;

[0038] S600, move the evaporation chamber body to the heating station, move the hook wire out of the evaporation chamber body, so that the hook wire returns to the initial temperature before step S300; then repeat steps S100, S200, S300, S400, S500 and S600 in sequence.

[0039] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0040] 1. By setting up a vertically movable evaporation chamber body, the evaporation chamber body is heated by electromagnetic induction and then moved to fit outside the droplet. A simulation test is carried out in a high-temperature and high-pressure environment. The structural design of the evaporation chamber body and the cooperation of the annular porous fins make it difficult for heat and gas to be lost due to heat convection. In this way, the pressure and temperature can more easily reach the test pressure and test temperature, the test efficiency can be significantly improved, the time required for the test is shortened, and the pressure and temperature in the inner cavity of the evaporation chamber are more stable, providing the droplets with the test pressure and test temperature that meet the test requirements, thereby improving the accuracy of the test.

[0041] 2. By setting a suspended hook hanging wire and cooperating with the propellant delivery mechanism, the test liquid is added to the hook hanging wire through the filling pipe, so that droplets can be formed on the hanging ball of the hook hanging wire, and the liquid in the hook hanging wire is further sucked out to form independent droplets, so as to avoid the liquid in the hook hanging wire expanding due to high temperature in a high temperature environment, thereby pushing the held droplets to fall, and then causing the test failure, thereby improving the success rate of the test. During the test, the droplets on the hook hanging wire are first located in a relatively low temperature environment outside the evaporation chamber body to avoid the droplets evaporating during the heating process of the evaporation chamber body. When the temperature of the inner cavity of the evaporation chamber reaches the test temperature, the droplets are allowed to enter the inner cavity of the evaporation chamber, thereby increasing the probability of droplet hanging, keeping the initial parameters of the droplets constant during the test process, improving the accuracy of multiple sets of test data, and facilitating accurate scientific research. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction to the drawings required for use in the embodiments will be given below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0043] Figure 1 This is a schematic diagram of the overall structure of the droplet evaporation test simulation device provided by the present invention.

[0044] Figure 2 This is a schematic diagram of the internal structure of the droplet evaporation test simulation device provided by the present invention.

[0045] Figure 3 For the present invention Figure 2 Enlarged view of the structure of part A in the middle.

[0046] Figure 4 It is a three-dimensional diagram of the combined structure of the evaporation chamber insulation layer and the evaporation chamber body of the present invention.

[0047] Figure 5 This is a cross-sectional view of the combined structure of the evaporation chamber insulation layer and the evaporation chamber body of the present invention.

[0048] Figure 6 It is a cross-sectional view of the combined structure of the evaporation chamber insulation layer and the evaporation chamber body of the present invention.

[0049] Figure 7 It is a three-dimensional diagram of the annular porous fin in the present invention.

[0050] Description of reference numerals:

[0051] 100. Test shell; 110. Shell transparent opening;

[0052] 200, evaporation chamber body; 210, opening; 220, evaporation chamber transparent port; 230, evaporation chamber inner cavity; 240, annular porous fin;

[0053] 300, evaporation chamber drive component;

[0054] 400, heating element;

[0055] 500, hook hanging wire;

[0056] 600, shock absorbing mechanism; 610, linear bearing; 620, guide rod; 630, shock absorbing spring;

[0057] 700, evaporation chamber insulation layer; 710, first hole; 720, second hole;

[0058] 800, propellant delivery mechanism; 810, filling pipe; 820, filler;

[0059] 900. Blow-off pipe. DETAILED DESCRIPTION

[0060] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0061] The present invention provides Figure 1-7 A high-temperature and high-pressure droplet evaporation test device is shown, comprising:

[0062] The test housing 100 has a built-in heating station and a test station, and the heating station is coaxially distributed directly above the test station; the test housing 100 can be an integral part or connected by multiple split parts.

[0063] The evaporation chamber body 200 is disposed within the test housing 100 and defines an evaporation chamber inner cavity 230. An opening 210 is formed on the lower end surface of the evaporation chamber body 200, communicating with the evaporation chamber inner cavity 230. Removably mounted within the evaporation chamber inner cavity 230 are annular porous fins 240 to suppress thermal convection. The evaporation chamber body 200 serves as a container for simulating the test environment and can be heated. Because the evaporation chamber body 200 must withstand high temperatures, it can be made of high-temperature-resistant solid metal or other materials.

[0064] Preferably, the evaporation chamber body 200 may be made of 310S stainless steel, which can operate in an environment of 1000° C. for a long time.

[0065] The evaporation chamber driving member 300 is provided above the heating station and is used to drive the evaporation chamber body 200 to move vertically between the heating station and the test station;

[0066] The heating element 400 is fixed in the test housing 100 and corresponds to the heating station, and is used to heat the evaporation chamber body 200 entering the heating station;

[0067] The hook wire 500 is vertically suspended in the test shell 100 and corresponds to the test station. The hook wire 500 enters the inner cavity 230 of the evaporation chamber from the opening 210 during the process of the evaporation chamber main body 200 moving from the heating station to the test station; the input end of the hook wire 500 is provided with a propellant delivery mechanism 800 for delivering droplets, and the outer side of the end of the hook wire 500 is provided with an observation channel; the function of the hook wire 500 is to generate controllable droplets thereon for subsequent testing. And the droplets include but are not limited to kerosene droplets. The hook wire 500 includes but is not limited to a syringe needle. The diameter of the hook wire 500 can be replaced according to the properties of the liquid (such as viscosity and tension, etc.) and the diameter of the droplets required. When the evaporation chamber main body 200 moves toward the test station, the hook wire 500 can enter the inner cavity 230 of the evaporation chamber through the opening 210.

[0068] The shock-absorbing mechanism 600 is installed below the evaporation chamber body 200 to absorb the impact of the evaporation chamber body 200's movement. It applies an upward force to the evaporation chamber body 200 when it moves to the test station. This dampens the vibrations generated by the evaporation chamber body 200 moving to the test station, thereby preventing droplets held by the hook wire 500 from falling due to vibration, which could lead to test failure.

[0069] By moving the evaporation chamber body 200 to the test station, on the one hand, the obstruction of the observation field by the heating element 400 can be avoided, allowing the user to observe the changes in the droplets through the transparent opening 110 of the shell and the transparent opening 220 of the evaporation chamber. On the other hand, in terms of the test process, the droplets on the hook hanging wire 500 can be placed in a relatively low-temperature environment outside the evaporation chamber body 200 to prevent the droplets from evaporating as the evaporation chamber body 200 heats up. When the temperature of the evaporation chamber inner cavity 230 reaches the test temperature, the droplets are allowed to enter the evaporation chamber inner cavity 230. This not only increases the probability of droplet dripping, but also maintains a constant initial parameter of the droplets during the test process, improving the accuracy of multiple sets of test data and facilitating accurate scientific research.

[0070] By arranging the opening 210 on the lower end surface of the evaporation chamber body 200, heat convection is less likely to cause heat and gas to be lost through the opening 210. In this way, the pressure and temperature of the evaporation chamber inner cavity 230 can more easily reach the test pressure and test temperature, and the test efficiency of this device is high, thereby shortening the time required for the test. In particular, when the evaporation chamber inner cavity 230 moves downward to the test station, the upward heat convection is less likely to cause heat and gas to be lost through the opening 210 located at the lower end surface. Therefore, the pressure and temperature inside the evaporation chamber inner cavity 230 are more stable, thereby providing the droplets with a test pressure and test temperature that meet the test requirements, thereby improving the accuracy of the test.

[0071] Furthermore, in the above technical solution, the propellant delivery mechanism 800 includes a filling pipe 810 and a filler 820. The filling pipe 810 is fixed to the test shell 100. The output end of the filler 820 is connected to the input end of the filling pipe 810. The output end of the filling pipe 810 extends to the inner cavity 230 of the evaporation chamber and is connected to the input end of the hook wire 500.

[0072] The hook hanging wire 500 is configured as an inverted J-shaped circular tube, and a hanging ball for hanging droplets is provided at the output end of the hook hanging wire 500.

[0073] The hook wire 500 is connected to the injector 820 via the injector pipe 810 . The injector 820 can inject the test liquid into the hook wire 500 through the injector pipe 810 , so that liquid droplets can be formed on the hook ball of the hook wire 500 .

[0074] Furthermore, in the above technical solution, a through hole is opened at the axis of the annular porous fin 240, which is coaxial with the opening 210 and has the same inner diameter as the opening 210, so that the end of the hook wire 500 passes through the opening 210 and the through hole;

[0075] Multiple annular porous fins 240 are arranged in parallel on the inner wall of the evaporation chamber body 200, avoiding the area covered by the transparent opening 220. The multiple layers of annular porous fins 240 effectively increase the heat transfer area, enhance heat transfer, and reduce the temperature difference between the evaporation chamber body 200 wall and the gas. Furthermore, they effectively suppress natural convection within the evaporation chamber body 200, ensuring the accuracy of the droplet evaporation experimental results.

[0076] In order to further reduce the outward heat dissipation of the evaporation chamber main body 200 and its internal natural convection, the present invention changes the original upper-opening evaporation chamber main body 200 to a lower-opening one. Since the temperature inside the evaporation chamber main body 200 is higher than the temperature outside, the natural convection formed flows from bottom to top. For the evaporation chamber main body 200 with an upper opening, natural convection can easily pass through the outlet, resulting in increased heat dissipation, while promoting the development of natural convection, affecting the accuracy of the experimental results. For the evaporation chamber main body 200 with a lower opening, the upper part of the evaporation is a closed space, which inhibits the formation of natural convection. At the same time, it is difficult for the gas inside the evaporation chamber main body 200 to flow out of the evaporation chamber main body 200 through the outlet, effectively reducing heat dissipation.

[0077] The design of the bottom-opening evaporation chamber body 200 brings a problem, that is, the propellant droplets need to be suspended on the hanging wire directly below the evaporation chamber body 200. The laboratory evaporation chamber body 200 moves downward quickly, so that the droplets are exposed to a high temperature and high pressure environment. When the droplets are suspended below the evaporation chamber body 200, they cannot be directly suspended vertically. In order to solve this technical problem, the present invention adopts a curved hook hanging wire 500 for hanging, which is required to be

[0078] 1) The outer contour of the hook wire 500 cannot be larger than the opening 210 of the evaporation chamber body 200 (the smaller the opening 210, the lower the heat dissipation). In fact, its outer contour is only about less than 5 mm.

[0079] 2) Since vertical suspension is not possible, a propellant delivery pipeline must be integrated into the hook hanging wire 500. After multiple tests, a round tube with an outer diameter of 0.8 mm was finally selected as the hanging wire;

[0080] 3) Directly using a round tube hook will make it difficult to suspend the droplet, and special treatment is required for the top of the hook wire 500. After practice, the top outlet position of the hook wire 500 needs to be welded with a hanging ball. The change of the hanging ball diameter can adjust the droplet size.

[0081] Furthermore, in the above technical solution, the observation channel includes a shell transparent port 110 and an evaporation chamber transparent port 220, wherein the shell transparent port 110 is arranged on both side walls of the test shell 100 corresponding to the height of the test station, and the evaporation chamber transparent port 220 is arranged on both side walls of the evaporation chamber main body 200; in some embodiments, the shell transparent port 110 can be composed of high-pressure resistant glass arranged on the outer peripheral wall of the test shell 100; the evaporation chamber transparent port 220 can be composed of high-pressure resistant glass arranged on the outer peripheral wall of the evaporation chamber main body 200.

[0082] When the evaporation chamber body 200 is moved to the test station, the transparent opening 110 and the transparent opening 220 are coaxially located. The hanging ball is now located on the axis connecting the two transparent openings 110. When the evaporation chamber body 200 is moved to the test station, the transparent opening 110 and the transparent opening 220 are aligned. The user can observe the interior of the test housing 100 through the overlapping area between the transparent openings 110 and 220.

[0083] In some embodiments, in order to observe the droplets more accurately, a high-speed camera can be used to capture the droplets outside the transparent housing opening 110. Changes in the droplets, such as changes in outline shape, diameter, and / or phase, can be recorded.

[0084] Furthermore, in the above technical solution, the evaporation chamber body 200 is made of a solid metal material, and its outer wall is wrapped with an evaporation chamber insulation layer 700, which moves synchronously with the evaporation chamber body 200. In embodiments where the heating element 400 includes an electromagnetic coil, the evaporation chamber insulation layer 700 can be positioned between the evaporation chamber body 200 and the electromagnetic coil. In some embodiments, the evaporation chamber insulation layer 700 can be made of aluminum silicate, a material that is heat-resistant and easy to process and install. The aluminum silicate insulation layer 700 can have a cylindrical structure, split in the middle, with the two halves of the aluminum silicate shell snapped together. In some embodiments, after the aluminum silicate shells are snapped together, the gap can be sealed with high-temperature-resistant silicone to prevent heat loss. The provision of the evaporation chamber insulation layer 700 effectively reduces heat loss from the evaporation chamber body 200 into the test housing 100 after heating, thereby increasing the rate of temperature rise within the evaporation chamber inner cavity 230 during testing and improving the insulation effect.

[0085] A first hole 710 is defined on the outside of the evaporation chamber insulation layer 700, corresponding to the transparent opening 220 of the evaporation chamber. This allows the transparent opening 220 to be exposed, and the evaporation chamber insulation layer 700 does not obstruct observation of changes in the droplets within the evaporation chamber inner cavity 230. A second hole 720 is defined at the bottom of the evaporation chamber insulation layer 700, corresponding to the opening 210. This allows the opening 210 to be exposed, and the evaporation chamber insulation layer 700 does not obstruct the entry of gas and the hook wire 500 into the evaporation chamber inner cavity 230.

[0086] Furthermore, in the above technical solution, the evaporation chamber driving member 300 includes a cylinder, which is fixedly mounted on the test shell 100, and the cylinder rod end of the cylinder is detachably mounted to the top wall of the evaporation chamber body 200 through bolts, and the connecting end of the cylinder is provided with a pneumatic mechanism for providing driving force.

[0087] As an alternative solution, the evaporation chamber drive 300 can also be set as a linear motor, an electric push rod or a hydraulic cylinder, and the evaporation chamber drive 300 includes but is not limited to a linear motor, an electric push rod or a hydraulic cylinder. As an example, the evaporation chamber drive 300 in this application uses a cylinder. The cylinder is arranged above the evaporation chamber body 200 in the vertical direction. The evaporation chamber body 200 is suspended on the cylinder rod of the cylinder. The lever of the cylinder is extended to drive the evaporation chamber body 200 to move downward to the test station. The lever of the cylinder is retracted to drive the evaporation chamber body 200 to move upward to the heating station. The evaporation chamber drive 300 is low in cost, fully standardized, and easy to produce and process.

[0088] The ultra-high temperature and high pressure environment simulation device for droplet evaporation testing also includes a shell insulation layer (not shown in the accompanying drawings), which is mounted on the exterior of the heating element 400. The shell insulation layer may also be provided with holes that expose the transparent opening 220 and opening 210 of the evaporation chamber. For details, please refer to the evaporation chamber insulation layer 700 and will not be described in detail for the sake of brevity. The shell insulation layer prevents heat generated by the heating element 400 from being dissipated into the test shell 100, thereby allowing the heat generated by the heating element 400 to be transferred to the evaporation chamber inner cavity 230 of the evaporation chamber insulation layer 700 as much as possible, thereby improving heating efficiency.

[0089] As an alternative, the heating element 400 can be configured as a resistance heating element, an electromagnetic heating element, or an infrared heating element. The heating element 400 can adopt various types of heating elements known in the art or that may appear in the future. As an example, the heating element 400 uses an electromagnetic heater. The heating element 400 includes an electromagnetic coil, and the electromagnetic coil is distributed around the outer periphery of the evaporation chamber body 200 located at the heating station. Electromagnetic induction heating can provide a maximum heating power of 100 kilowatts in a very small space. The time required for the temperature inside the evaporation chamber body 200 to rise to 500°C does not exceed 20 seconds, and the temperature outside the evaporation chamber body 200 rises by less than 1°C during the heating process. In addition, since the heating tube adopts water cooling, the heating tube can operate safely and stably.

[0090] The electromagnetic coil generates an alternating magnetic field when powered by an AC power source. When the metal evaporation chamber body 200 is located within the electromagnetic coil, the alternating magnetic field generates eddy currents within the evaporation chamber body 200, thereby heating the evaporation chamber body 200. The electromagnetic coil allows the evaporation chamber body 200 to heat up at a rate of 20°C / s to 50°C / s, shortening the heating time and reducing the test duration.

[0091] Furthermore, in the above technical solution, the shock absorbing mechanism 600 includes:

[0092] There are at least two linear bearings 610 , and the plurality of linear bearings 610 are fixed in the test housing 100 ;

[0093] The number of guide rods 620 is the same as that of linear bearings 610 , and multiple guide rods 620 are fixedly mounted on the lower end surface of the evaporation chamber body 200 . The guide rods 620 correspond one-to-one with the linear bearings 610 and slide in conjunction with each other in the vertical direction.

[0094] The shock-absorbing spring 630 is sleeved on the outside of the guide rod 620 and is located between the linear bearing 610 and the lower end surface of the evaporation chamber body 200 .

[0095] The linear bearings 610, guide rods 620, and shock-absorbing springs 630 can be arranged accordingly. In the embodiment shown in the figure, there are four linear bearings 610, four guide rods 620, and four shock-absorbing springs 630. The upper ends of the four guide rods 620 are connected to the four corners of the lower end surface of the evaporation chamber body 200. With this arrangement, the guide rods 620 can slide along the linear bearings 610 during the vertical movement of the evaporation chamber body 200. In this way, the linear bearings 610 and the guide rods 620 can guide the evaporation chamber body 200, thereby preventing the evaporation chamber body 200 from shaking.

[0096] The ultra-high temperature and high pressure environment simulation device for droplet evaporation test also includes a blow-off pipe 900, which is located on one side of the hook wire 500 and can be detachably mounted on the test shell 100. The two ends of the test shell 100 are respectively located on the inner and outer sides of the test shell 100. The end of the blow-off pipe 900 located outside the test shell 100 is connected to the air source. When the evaporation chamber body 200 moves from the heating station to the test station, the top of the blow-off pipe 900 enters the inner cavity 230 of the evaporation chamber through the opening 210. The blow-off pipe 900 is used to blow air into the inner cavity 230 of the evaporation chamber, and the number of blow-off pipes 900 can be set arbitrarily. The diameter of the blow-off pipe 900 can be between 1 mm and 2 mm, for example, 1 mm, 1.5 mm or 2 mm.

[0097] Exemplarily, the test shell 100 may include a detachable upper cavity and a lower cavity. The upper cavity is located above the lower cavity. After the upper cavity and the lower cavity are installed, the test shell 100 can be formed. The shell transparent opening 110 can be set on the upper cavity. In this way, the height of the shell transparent opening 110 is relatively high, which can facilitate user observation. The cables or pipes connected to the evaporation chamber drive 300, the heating element 400 and the hook wire 500 can all pass through the lower cavity for connection with components such as an external power supply or gas source. The lower cavity can usually be placed on the ground or on a table, and it usually does not move. In this way, when disassembling the upper cavity, the evaporation chamber drive 300, the heating element 400 and the hook wire 500 and the cables or pipes connecting them can all remain stationary, thereby reducing the difficulty of disassembly.

[0098] For example, the test apparatus 10 may further include a mounting bracket. The mounting bracket is detachably connected to the lower chamber. The upper chamber may be cylindrical, with its opening facing downward. Furthermore, the upper chamber may be covered by the mounting bracket. With this arrangement, when the upper chamber is disassembled, the evaporation chamber body 200, evaporation chamber drive element 300, heating element 400, and hook wire 500 are all exposed without being obstructed by the lower chamber, providing ample space for installation and commissioning.

[0099] The droplet evaporation test simulation method is operated using an ultra-high temperature and high pressure environment simulation device for droplet evaporation test. The steps are as follows:

[0100] S100: Pressurize the interior of the test housing 100 to bring the pressure in the evaporation chamber inner chamber 230 to the test pressure. The user pressurizes the interior of the test housing 100 to bring the pressure in the test housing 100 to the test pressure. Due to the provision of opening 210, the test housing 100 can communicate with the evaporation chamber body 200. This allows the pressure in the evaporation chamber inner chamber 230 to reach the test pressure. Pressurization can be achieved by filling the test housing 100 with high-pressure nitrogen gas. Nitrogen is an inert gas that prevents liquid droplets from burning at high temperatures and is low-cost.

[0101] S200: The evaporation chamber body 200 is heated at a heating station to bring the temperature of the evaporation chamber inner cavity 230 to the test temperature. The evaporation chamber driving member 300 moves the evaporation chamber body 200 to the heating station, and the heating member 400 is activated to bring the temperature of the evaporation chamber inner cavity 230 to the test temperature. In this way, the evaporation chamber inner cavity 230 can form the high temperature and high pressure environment required for the test.

[0102] S300: Squeeze the liquid droplets onto the hook wire 500 so that the droplets are held on the ball of the hook wire 500; suck and push the droplets through the injector 820, and inject the test liquid into the hook wire 500 through the injector tube 810, so that droplets can be formed on the ball of the hook wire 500. Squeeze the liquid droplets onto the hook wire 500, and then the liquid in the hook wire 500 can be extracted. Specifically, the liquid in the hook wire 500 is sucked out through the injector tube 810 by the injector 820, so that the held droplets are separated from the liquid in the hook wire 500 to form independent droplets. This arrangement can prevent the liquid in the hook wire 500 from expanding due to the high temperature in a high-temperature environment, thereby pushing the held droplets to fall, thereby causing the test to fail, thereby improving the success rate of the test.

[0103] S400, move the evaporation chamber body 200 to the test station so that the hook wire 500 enters the inner cavity 230 of the evaporation chamber, and observe and record the changes in the droplets held on the hook wire 500; specifically, use the evaporation chamber driving member 300 to drive the evaporation chamber body 200 to move downward in the vertical direction to the test station. The shock-absorbing mechanism 600 applies a force toward the heating station to the evaporation chamber 200 when it moves to the test station, guiding the evaporation chamber body 200, thereby preventing the evaporation chamber body 200 from shaking. The droplets held on the hook wire 500 enter the inner cavity 230 of the evaporation chamber through the opening 210, so that the test can be carried out in a high temperature and high pressure environment. Observe the changes in the droplets, such as changes in the contour shape, changes in the diameter size and / or changes in the phase form.

[0104] S500, after the test droplet evaporation simulation is completed, air (for example, nitrogen) is blown into the inner cavity 230 of the evaporation chamber main body 200 located at the test station to clean the inner wall of the evaporation chamber main body 200 and cool down the inner cavity 230 of the evaporation chamber; specifically, air is blown into the inner cavity 230 of the evaporation chamber using the blow-off tube 900. On the one hand, the test liquid attached to the inner wall of the evaporation chamber main body 200 after the previous test is completed can be blown out through the opening 210 to ensure that the environment in the inner cavity 230 of the evaporation chamber is consistent for each test; on the other hand, the inner cavity 230 of the evaporation chamber can be quickly cooled to shorten the test interval; on the other hand, the droplets attached to the transparent port 220 of the evaporation chamber after evaporation can be blown off to clean the transparent port 220 of the evaporation chamber to avoid affecting the observation.

[0105] S600: Move the evaporation chamber body 200 to the heating station and remove the hook wire 500 from the evaporation chamber body 200 to restore the hook wire 500 to its initial temperature before step S300. This ensures that the droplet has the same initial temperature before each test. This improves the accuracy of multiple sets of test data and facilitates accurate scientific research. Steps S100, S200, S300, S400, S500, and S600 are then repeated in this order.

[0106] It should be noted that the order of step S100, step S200 and step S300 can be adjusted arbitrarily, or performed simultaneously, and the user can select a suitable order according to actual conditions.

[0107] In order to improve the reliability of the droplet evaporation test simulation, steps S100-S600 are performed at least once, for example, they can be repeated multiple times to record the changes of the droplets under different test pressures and / or test temperatures. The operation process of completing the droplet evaporation test simulation once is regarded as a process cycle, that is, the entire process of executing steps S100-S600 is recorded as P, and the nth execution of steps S100-S600 is represented as P n .

[0108] For example, compared to P n-1 , P n The test pressure and / or test temperature can be gradually increased from the lowest value to the highest value. In other words, the test pressure and / or test temperature in each repeated process cycle can be higher than the test pressure and / or test temperature in the previous process cycle. This configuration allows droplets to be tested in a variety of environments, providing users with multiple sets of data.

[0109] For example, the test pressure for the current process cycle can be increased by 1 MPa compared to the previous process cycle. For example, if the test pressure for the previous process cycle was 1 MPa, the test pressure for the current process cycle could be 2 MPa. This setup allows droplets to be tested in a variety of environments, providing users with multiple sets of data.

[0110] For example, the test temperature for this process cycle can be increased by 100°C compared to the previous process cycle. For example, if the test temperature for the previous process cycle was 100°C, the test temperature for this process cycle can be 200°C. This configuration allows droplets to be tested in a variety of environments, providing users with multiple sets of data.

[0111] For example, compared to the last process cycle, the test pressure can first be gradually increased from the lowest value to the highest value, and then the test temperature can be gradually increased from the lowest value to the highest value. That is, after the process cycle is repeated multiple times and the test pressure reaches the highest value, the next time the process cycle is repeated, the test temperature is gradually increased from the lowest value until the test temperature reaches the highest value after multiple process cycles are repeated. This configuration allows droplets to be tested in a variety of environments, providing users with multiple sets of data. Furthermore, the test pressure and temperature are relatively easy to control, thereby reducing testing difficulty and improving testing efficiency.

[0112] For example, during the entire process cycle, the test pressure may be gradually increased from 1 MPa to 10 MPa, for example, 1 MPa, 2 MPa, 3 MPa, 4 MPa, 5 MPa, 6 MPa, 7 MPa, 8 MPa, 9 MPa, and 10 MPa. The test temperature may be gradually increased from 200°C to 600°C, for example, 200°C, 300°C, 400°C, 500°C, and 600°C.

[0113] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A high-temperature and high-pressure droplet evaporation test device, characterized in that: include: A test housing (100) has a built-in heating station and a test station, and the heating station is coaxially distributed directly above the test station; An evaporation chamber body (200) is disposed in a test housing (100), and has an evaporation chamber inner cavity (230) therein. An opening (210) communicating with the evaporation chamber inner cavity (230) is provided on a lower end surface of the evaporation chamber body (200). An annular porous fin (240) for suppressing heat convection is detachably installed in the evaporation chamber inner cavity (230); An evaporation chamber driving member (300) is arranged above the heating station and is used to drive the evaporation chamber body (200) to move vertically between the heating station and the test station; A heating element (400) is fixed in the test housing (100) and corresponds to a heating station, and is used to heat the evaporation chamber body (200) entering the heating station; A hook hanging wire (500) is vertically suspended in the test housing (100) and corresponds to the test station. A propellant delivery mechanism (800) for delivering droplets is provided at the input end of the hook hanging wire (500), and an observation channel is provided on the outer side of the end of the hook hanging wire (500); The shock absorbing mechanism (600) is installed below the evaporation chamber body (200) and is used to absorb the impact force of the movement of the evaporation chamber body (200).

2. A high-temperature and high-pressure droplet evaporation test device according to claim 1, characterized in that: The propellant delivery mechanism (800) comprises a filling pipe (810) and a filler (820), wherein the filling pipe (810) is fixed on the test shell (100), the output end of the filler (820) is connected to the input end of the filling pipe (810), and the output end of the filling pipe (810) extends to the inner cavity (230) of the evaporation chamber and is communicated with the input end of the hook wire (500); The hook hanging wire (500) is configured as an inverted J-shaped circular tube, and an output end of the hook hanging wire (500) is provided with a hanging ball for hanging droplets.

3. The high-temperature and high-pressure droplet evaporation test device according to claim 1, characterized in that: The annular porous fin (240) is provided with a through hole at the axis thereof, which is coaxial with the opening (210) and has the same inner diameter as the opening (210), so that the end of the hook wire (500) can pass through the opening (210) and the through hole; The number of the annular porous fins (240) is set to be multiple, and the multiple annular porous fins (240) are distributed in parallel on the inner wall of the evaporation chamber body (200), and the annular porous fins (240) avoid the coverage area of the evaporation chamber transparent opening (220).

4. The high-temperature and high-pressure droplet evaporation test device according to claim 2, characterized in that: The observation channel comprises a shell transparent opening (110) and an evaporation chamber transparent opening (220), wherein the shell transparent opening (110) is arranged on two side walls of the test shell (100) corresponding to the height of the test station, and the evaporation chamber transparent opening (220) is arranged on two side walls of the evaporation chamber body (200); When the evaporation chamber body (200) moves to the test station, the shell transparent opening (110) and the evaporation chamber transparent opening (220) are coaxially distributed, and the hanging ball is located on the axis connecting the two sides of the shell transparent opening (110).

5. The high-temperature and high-pressure droplet evaporation test device according to claim 1, characterized in that: The evaporation chamber body (200) is made of solid metal material, and its outer side wall is wrapped with an evaporation chamber insulation layer (700), and the evaporation chamber insulation layer (700) moves synchronously with the evaporation chamber body (200); A first hole (710) corresponding to the transparent opening (220) of the evaporation chamber is provided on the outside of the evaporation chamber insulation layer (700), and a second hole (720) corresponding to the opening (210) is provided at the bottom of the evaporation chamber insulation layer (700).

6. The high-temperature and high-pressure droplet evaporation test device according to claim 1, characterized in that: The evaporation chamber driving member (300) comprises a cylinder, which is fixedly mounted on the test housing (100), and the cylinder rod end of the cylinder is detachably mounted on the top wall of the evaporation chamber body (200) via bolts, and the connecting end of the cylinder is provided with a pneumatic mechanism for providing driving force.

7. The high-temperature and high-pressure droplet evaporation test device according to claim 1, characterized in that: It also includes a shell thermal insulation layer, the shell thermal insulation layer is sleeved on the outside of the heating element (400); The heating element (400) includes an electromagnetic coil, and the electromagnetic coil is distributed around the outer periphery of the evaporation chamber body (200) located at the heating station.

8. The high-temperature and high-pressure droplet evaporation test device according to claim 1, characterized in that: The shock absorbing mechanism (600) comprises: There are at least two linear bearings (610), and the plurality of linear bearings (610) are fixed in the test housing (100); The number of guide rods (620) is the same as that of the linear bearings (610), and the plurality of guide rods (620) are fixedly mounted on the lower end surface of the evaporation chamber body (200), and the guide rods (620) correspond one-to-one with the linear bearings (610) and slide in conjunction with each other in the vertical direction; The shock-absorbing spring (630) is sleeved on the outside of the guide rod (620) and is located between the linear bearing (610) and the lower end surface of the evaporation chamber body (200).

9. The high-temperature and high-pressure droplet evaporation test device according to claim 1, characterized in that: The invention also includes a blow-off pipe (900), which is located on one side of the hook wire (500) and can be detachably mounted on the test shell (100), wherein the two ends of the test shell (100) are respectively located on the inner and outer sides of the test shell (100), and the end of the blow-off pipe (900) located outside the test shell (100) is connected to the gas source, and when the evaporation chamber body (200) moves from the heating station to the test station, the top end of the blow-off pipe (900) enters the inner cavity (230) of the evaporation chamber through the opening (210).

10. A droplet evaporation test simulation method, using a high-temperature and high-pressure droplet evaporation test apparatus according to any one of claims 1 to 9, characterized in that: The steps are as follows: S100, pressurizing the inside of the test housing (100) so that the pressure in the inner chamber (230) of the evaporation chamber reaches the test pressure; S200, heating the evaporation chamber body (200) at a heating station so that the temperature of the evaporation chamber inner cavity (230) reaches a test temperature; S300, squeezing the liquid droplets toward the curved hook hanging wire (500) so that the liquid droplets are held on the hanging balls of the curved hook hanging wire (500); S400, moving the evaporation chamber body (200) to a test station so that the hook hanging wire (500) enters the inner cavity (230) of the evaporation chamber, and observing and recording changes in the droplets held on the hook hanging wire (500); S500, after the test droplet evaporation simulation is completed, air is blown into the evaporation chamber inner cavity (230) of the evaporation chamber main body 200 located at the test station to clean the inner wall of the evaporation chamber main body (200) and cool the evaporation chamber inner cavity (230); S600, moving the evaporation chamber body (200) to the heating station, moving the hook hanging wire (500) out of the evaporation chamber body (200), so that the hook hanging wire (500) is restored to the initial temperature before step S300; Then, steps S100 , S200 , S300 , S400 , S500 and S600 are repeatedly executed in the order in which they are performed.

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