CN112362299A - Passive exhaust bubble fusion experimental device and method in decompression state - Google Patents
Passive exhaust bubble fusion experimental device and method in decompression state Download PDFInfo
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Abstract
The invention belongs to the technical field of bubble fusion experiments of limited-volume ventilation bubbles, and particularly relates to a passive exhaust bubble fusion experimental device and method in a decompression state. The invention adopts the completely closed decompression tank as the container, which can well overcome the adverse effects of the cavitation water tunnel experiment and the normal pressure water tank experiment; controlling the natural cavitation phenomenon in a decompression environment through a cavitation inhibition head type; the passive exhaust function is realized through the matching design of the air tank, the electromagnetic valve and the one-way valve, and the passive exhaust simulation device is used for simulating passive exhaust.
Description
Technical Field
The invention belongs to the technical field of bubble fusion experiments of limited-volume ventilation bubbles, and particularly relates to a passive exhaust bubble fusion experimental device and method in a decompression state.
Background
In the process that the navigation body launches from under water and arrives the surface of water, ambient pressure is the continuous decline, and the navigation body self can keep higher velocity of motion after the section of thick bamboo process of going out simultaneously. Because of the pressure drop and the higher movement speed, the navigation body is easy to generate natural cavitation in the movement process and is accompanied with the generation and collapse of cavitation bubbles. This process is extremely unstable and thus may have a large influence on the underwater traveling attitude of the vehicle. On the other hand, in the storage stage before the launching of the navigation body, the internal gas pressure is basically equivalent to the environmental pressure of the carrier, and in the process that the navigation body launches and moves to the water surface, high-pressure gas in the navigation body needs to be discharged from the inside, otherwise, the structure of the navigation body bears the pressure of several atmospheric pressures, and the structural strength of the navigation body is easily damaged. Aiming at the generation and collapse of natural cavitation and the discharge of high-pressure gas in a navigation body and the combination of the attitude control of a water trajectory of the navigation body, the most effective method for solving the problem is to adopt an exhaust control technology for inhibiting a cavitation head type, and the principle is to adopt the cavitation head type to reduce the occurrence of natural cavitation, namely reduce the number of primary cavitation. Meanwhile, aiming at high-pressure gas with the pressure equal to or slightly higher than the launching environment pressure in the missile, through the adjustment of exhaust parameters, along with the high-speed water outlet of the missile, the gas exhausted from an internal gas source or a gas chamber forms exhaust bubbles wrapping the missile body on the surface of the missile.
In the field of ventilation and cavitation experiment research, previous people mostly adopt a cavitation water tunnel or a normal-pressure water tank to carry out experiments. In order to ensure the installation strength of the model in the cavitation water tunnel experiment, the relative scale of the model supporting rod is often very large, so that the interference of the supporting rod on a flow field is very serious, particularly, the flow field is very disordered under low cavitation number, the influence of the model supporting rod is difficult to eliminate, in addition, the distribution of a cavitation area can be strongly influenced by gravity, and the cavitation appears obvious 'floating upward'. The normal pressure water tank experiment can not meet the condition of similar cavitation bubble number, and can not obtain better cavitation bubble fusion effect.
Disclosure of Invention
The invention aims to overcome the adverse effects of a cavity water tunnel experiment and a normal-pressure water tank experiment and provides a passive exhaust bubble fusion experimental device in a decompression state.
The purpose of the invention is realized by the following technical scheme: the device comprises an underwater navigation body model, a pressure reduction system, a ventilation system, a motion system, a control system and an information acquisition system; the underwater vehicle model comprises a head region, an air cavity region and a transition region; the air cavity region comprises a first cylinder and a second cylinder; the first cylinder is arranged above the second cylinder, the first cylinder is communicated with the inner space of the second cylinder, a circle of exhaust holes are uniformly formed in the upper part of the first cylinder around the first cylinder, and a pressure sensor is arranged in the first cylinder; the head area comprises a cavitation suppression head type, and the cavitation suppression head type is arranged at the upper end of the first column body through a head sealing plate and a front baffle plate; the gas tank is arranged in the second column body, and the upper end and the lower end of the gas tank are fixed in the second column body through gas tank fixing blocks; the air inlet of the air tank is arranged at the lower end of the air tank, a one-way valve and a pressure sensor are arranged at the air inlet of the air tank, the air jet of the air tank is arranged at the upper end of the air tank, and an electromagnetic valve is arranged at the air jet of the air tank; the transition area comprises a first transition section, a second transition section and a base; the middle part of the first transition section is a cylinder, the upper end and the lower end of the first transition section are of gradually expanding structures, the upper end of the first transition section is connected with the lower end of the second cylinder, and the lower end of the first transition section is connected with the second transition section; the lower end of the second transition section is arranged on the base, and the side part of the second transition section is provided with an airfoil structure; one end of the wing-shaped structure is connected with the second transition section, and the other end of the wing-shaped structure is connected with the connecting plate; the motion system comprises a synchronous belt sliding table, and a sliding block is arranged on the synchronous belt sliding table; the pressure reducing system comprises a pressure reducing tank; the underwater navigation body model is integrally arranged in the pressure reducing tank, and a connecting plate in a transition area of the underwater navigation body model is connected with a sliding block of the synchronous belt sliding table; the ventilation system comprises an air pump, the air pump is connected with a one-way valve at the air inlet of the air tank through a ventilation pipe, and a pressure reducing valve is arranged on the ventilation pipe; the lower part of the base is provided with a hole, and wires of the pressure sensor, the electromagnetic valve and the one-way valve penetrate through the lower part of the base and are connected with a control system outside the pressure reduction tank.
The invention also aims to provide a passive exhaust bubble fusion experimental method in a decompression state.
The purpose of the invention is realized by the following technical scheme: the method comprises the following steps:
step 1: injecting water into the pressure reducing tank, placing the underwater navigation body model on the water surface, and setting a gas tank pressure threshold value of the underwater navigation body model through the pressure reducing valve;
step 2: opening a pressure reducing valve and an electromagnetic valve at an air injection port of an air tank in the underwater vehicle model, enabling external air to enter the air tank through an air pump and a one-way valve, and discharging the external air from an exhaust hole in the upper part of the first column body through the electromagnetic valve; after the underwater navigation body model is stabilized, the underwater navigation body model is sunk into water, and water cannot enter the air tank due to the exhaust function;
and step 3: after the underwater navigation body model reaches the designated position at the bottom of the decompression tank, closing the electromagnetic valve; at the moment, the exhaust hole at the upper part of the first column body continues to exhaust until the internal and external pressure difference is balanced, and the gas is not discharged outside any more;
and 4, step 4: decompressing the decompression tank until reaching the set environmental pressure;
and 5: observing the state of gas entering the gas tank through the pressure reducing valve, and closing the pressure reducing valve when the gas pressure in the gas tank reaches a set value to ensure that the gas in the gas tank has constant quality, so that the pressure of the gas tank is prevented from being reduced in the test process, and the pressure reducing valve is started to perform inflation operation;
step 6: and performing an experiment, controlling the electromagnetic valve at the air injection port of the motion system and the air tank through the control system, enabling the air in the air tank exhausted by the electromagnetic valve and the underwater navigation body model to move to meet the experiment requirement, and simultaneously recording the development fusion condition on the surface of the underwater navigation body model after the air is exhausted by a high-speed camera in the information acquisition system.
The invention has the beneficial effects that:
the invention adopts the completely closed decompression tank as the container, which can well overcome the adverse effects of the cavitation water tunnel experiment and the normal pressure water tank experiment; controlling the natural cavitation phenomenon in a decompression environment through a cavitation inhibition head type; the passive exhaust function is realized through the matching design of the air tank, the electromagnetic valve and the one-way valve, and the passive exhaust simulation device is used for simulating passive exhaust.
Drawings
Fig. 1(a) is an isometric view of a model of an underwater vehicle according to the present invention.
FIG. 1(b) is a front view of a model of an underwater vehicle according to the present invention.
FIG. 1(c) is a left side view of the model of the underwater vehicle in the present invention.
Fig. 2(a) is a side view of the installation position of the model of the underwater vehicle in the pressure-reducing tank in the present invention.
FIG. 2(b) is a front view showing the installation position of the model of the underwater vehicle in the pressure-reducing tank in the present invention.
FIG. 3 is a schematic view showing the positions of a head sealing plate and a front bulkhead of the model of the underwater vehicle of the present invention.
FIG. 4 is a schematic diagram of an experimental apparatus for passive degassing bubble fusion under reduced pressure according to the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention relates to the design of an underwater navigation body model, and on the basis of an established decompression test system, a series of model tests are developed by depending on a set of self-developed experimental devices to obtain a cavitation fusion mechanism in a passive exhaust state, so that a cause analysis experiment, a single variable cavitation fusion mechanism test, a differential research on the mixing and fusion characteristics of a cavitation flow in an active ventilation and passive exhaust mode and a flow fine measurement technology test are carried out. The invention adopts the completely closed decompression tank as the container, and can well overcome the adverse effects of the cavitation water tunnel experiment and the normal pressure water tank experiment.
A passive exhaust bubble fusion experimental device in a decompression state comprises an underwater navigation body model, a decompression system, a ventilation system, a motion system, a control system and an information acquisition system; the underwater vehicle model comprises a head region, an air cavity region and a transition region; the air cavity region comprises a first cylinder and a second cylinder 106; the first cylinder is arranged above the second cylinder, the first cylinder is communicated with the inner space of the second cylinder, a circle of exhaust holes 104 are uniformly formed in the upper part of the first cylinder around the first cylinder, and a pressure sensor 105 is arranged in the first cylinder; the head region comprises a cavitation suppressing head type 101 which is arranged at the upper end of the first column through a head sealing plate 102 and a front baffle 103; an air tank 108 is arranged in the second column body, and the upper end and the lower end of the air tank are fixed in the second column body through air tank fixing blocks 109; the air inlet of the air tank is arranged at the lower end of the air tank, a one-way valve 110 and a pressure sensor 111 are arranged at the air inlet of the air tank, the air outlet of the air tank is arranged at the upper end of the air tank, and an electromagnetic valve 107 is arranged at the air outlet of the air tank; the transition region comprises a first transition section 112, a second transition section 113 and a base 116; the middle part of the first transition section is a cylinder, the upper end and the lower end of the first transition section are of gradually expanding structures, the upper end of the first transition section is connected with the lower end of the second cylinder, and the lower end of the first transition section is connected with the second transition section; the lower end of the second transition section is arranged on the base, and the side part of the second transition section is provided with an airfoil structure 114; one end of the wing-shaped structure is connected with the second transition section, and the other end of the wing-shaped structure is connected with the connecting plate 115; the motion system comprises a synchronous belt sliding table, and a sliding block is arranged on the synchronous belt sliding table; the pressure reducing system comprises a pressure reducing tank; the underwater navigation body model is integrally arranged in the pressure reducing tank, and a connecting plate in a transition area of the underwater navigation body model is connected with a sliding block of the synchronous belt sliding table; the ventilation system comprises an air pump, the air pump is connected with a one-way valve at the air inlet of the air tank through a ventilation pipe, and a pressure reducing valve is arranged on the ventilation pipe; the lower part of the base is provided with a hole, and wires of the pressure sensor, the electromagnetic valve and the one-way valve penetrate through the lower part of the base and are connected with a control system outside the pressure reduction tank.
The invention controls the natural cavitation phenomenon in the decompression environment through the cavitation inhibition head type 101; the passive exhaust function is realized through the matching design of the air tank, the electromagnetic valve and the one-way valve, and the passive exhaust simulation device is used for simulating passive exhaust.
Example 1:
the underwater vehicle model imitates the appearance of French M51 missile, adopts cavitation suppression head shape, and the overall size of the model is designed according to the scaling relation, and the whole model is made of 5A06 aluminum alloy. The overall length of the model was 325mm and the diameter 57.5 mm. In order to firmly connect the experimental model on the motion mechanism and reduce the influence of the model support structure on the flow field and the exhaust bubble flow as much as possible, a connecting piece and an NACA airfoil structure are designed, so that the rigidity is improved, and the resistance and the turbulence effect are reduced.
The invention is used for researching a vacuole fusion mechanism in a passive exhaust state, and is mainly used for measuring the influence of different air volume and different incoming flow speed on the ventilation vacuole form of the surface of a model
The experimental use environment, the specific structure, the measurement process and the measurement method of the passive exhaust bubble fusion experimental device in the decompression state are as follows:
1. the experimental use environment is as follows:
the using environment of the invention is shown in fig. 4, and comprises an underwater navigation body model, a pressure reducing system, a ventilating system, a motion system, a control system and an information acquisition system.
As shown in fig. 2(a) and 2(b), the underwater navigation body model is mounted on the synchronous belt sliding table through bolts, is positioned at the lower part of the pressure reduction tank, and moves along with the sliding table, and the movement of the underwater navigation body model is recorded by the high-speed camera through the long observation window at the side surface of the pressure reduction tank.
The pressure reduction system consists of a pressure reduction tank and a vacuum pump and provides a pressure reduction environment for experiments. In experiments under different working conditions, when the influence of different ventilation volumes on the ventilation vacuole form on the surface of the underwater navigation body is researched, the ventilation system is used for adjusting the ventilation flow; when the influence of the incoming flow speed on the form of the aeration vacuole on the surface of the underwater vehicle is researched, the regulation and control of the model motion speed are realized through a motion system. The high-speed camera in the information acquisition system illuminates through 2 yellow-head lamps with power of 2KW, provides a light source, and does not generate a stroboscopic phenomenon in a shooting picture of the high-speed camera. The ground glass paster is pasted on the observation window of the shooting surface, so that light is uniformly distributed on the observation window, and the best shooting effect is achieved.
2. The specific structure and function are realized:
the connecting plate 115 and the wing profile 114 of the underwater navigation body model and the wing profile 114 and the second transition section 113 are connected in a welding mode. And by adopting an airfoil structure, the rigidity is improved, and the resistance and the turbulence effect are reduced. The connecting plate is connected with the sliding block of the synchronous belt sliding table through four bolts, and the model is connected with the wing-shaped structure supporting plate through the tail support. Through the connection mode, the model and the synchronous belt sliding table are tightly connected, and the exhaust bubbles are symmetrical as much as possible while the strong supporting effect is achieved for the high-speed movement of the model. The section form of the airfoil is designed to adopt NACA series airfoil to reduce the disturbance of the model supporting structure to the flow field and the resistance generated by the movement of the supporting structure. The lower part of a transition section base 116 at the bottom of the underwater vehicle model is provided with a hole, so that the wires of the pressure sensors 105 and 111, the electromagnetic valve 108 and the one-way valve 110 can pass through and be controlled outside the pressure reduction tank.
The passive exhaust is mainly an external leakage process of gas under the action of pressure difference, and is different from an active ventilation mode of re-exhausting gas from outside direct gas. The model used the cavitation suppression head model 101 described above and divided the entire model into three regions: head regions, air cavity regions, and other regions. The cavitation suppression head type 101 is mainly a hollow structure to reduce the weight of the model, the air cavity part comprises an air tank 108, an electromagnetic valve 107, a one-way valve 110 and a pressure sensor 111, and the rest model part is other areas. When the underwater navigation body model 1 is used for experiments, each pressure sensor is triggered and data is transmitted back to the computer. As shown in fig. 1(c), the exhaust gas control solenoid valve 107 is mounted on the upper portion of the gas tank 108, the check valve 110 and the pressure sensor 111 are mounted on the lower portion of the gas tank 108, and both the solenoid valve 107 and the check valve 110 are screw-mounted on the gas tank 108 for waterproofing.
The experimental process is as follows:
1. the gas tank 108 is filled with a suitable amount of gas at a constant pressure by an external gas pump through the check valve 110 under the action of a pressure reducing valve connected to the other end of the vent pipe of the check valve 110. Under the action of the pressure reducing valve, the gas is automatically filled by setting the required gas quantity parameter, and the gas flows through the one-way valve 110 through the gas guide pipe and enters the gas tank 108;
2. when the gas pressure in the gas tank 108 reaches a set value, the pressure reducing valve is closed to avoid the pressure reduction of the gas tank 108 in the test process, and the pressure reducing valve is started to carry out gas charging operation;
3. when the gas is discharged, the gas is discharged from the gas tank 108 through the solenoid valve 107 to the area between the head sealing plate 102 and the front partition 103, and is discharged out of the underwater vehicle model 1 through the exhaust hole, as shown in fig. 3. The motion system and the exhaust control electromagnetic valve 107 are controlled by the control system, so that the sequence or synchronization of two actions of gas in the gas tank 108 exhausted by the electromagnetic valve 107 and model motion can meet the test requirement, and meanwhile, a high-speed camera records the development and fusion condition of the gas exhausted on the surface of the model.
Before the experiment, the operation measures for ensuring the water tightness are as follows:
1. before the test, the underwater navigation body model 1 is above the water surface, and the pressure value required to be reached in the gas tank 108 is set through a pressure reducing valve;
2. opening the electromagnetic valve 107 and the pressure reducing valve to enable external air to be injected into the model air tank 108 and exhausted through the exhaust hole, sinking the underwater vehicle model 1 into water after stabilization, and enabling the water not to enter the air tank 108 due to the exhaust function;
3. after the underwater navigation body model 1 reaches the bottom designated position, the gas tank control electromagnetic valve 107 is closed (the pressure in the gas tank 108 can be adjusted, and the influence of the initial internal and external pressure difference on bubble flow mixing and fusion is researched, if the underwater navigation body model is not closed, the experiment simulation on the actual physical problem is carried out under the ideal condition), at the moment, the exhaust hole in the upper part of the gas tank 108 continues to exhaust until the internal and external pressure difference is balanced, and the gas is not discharged;
4. reducing the pressure in the tank to reach the set environmental pressure, wherein a small amount of bubbles can be generated in the process;
5. observing the state of the gas entering the gas cavity through the pressure reducing valve, and closing the pressure reducing valve after the set parameters are reached so that the gas in the gas tank 108 has constant quality;
6. experiments were performed.
Because the control system needs to control the electromagnetic valve structures of the motion system and the exhaust control system at the same time, and the motion time of the model is in the order of fractions of a second, the time is shorter, and higher requirements are put forward on the signal delay of the motion system, the exhaust control system and the model. Therefore, the system needs to be adjusted, calibrated for delay time and corrected before the test is carried out. The specific test operations were as follows:
(1) connecting the three according to a circuit diagram, and testing the availability of the system;
(2) installing the high-speed camera in place, and setting the shooting frequency of the high-speed camera to a higher level of 1000-3000 frames/s under the condition that the conditions allow;
(3) setting the underwater vehicle model 1 in a certain fixed movement ventilation state, carrying out a test, and recording the model movement by using a high-speed camera;
(4) observing images shot by a high-speed camera, comparing the relative time sequence relation between the model movement and the exhaust, if the requirements are met, carrying out other tests of the movement state and the ventilation state for verification, and if the requirements are met, ending the calibration test;
(5) otherwise, the system delay signal time needs to be adjusted again through testing. Until the system joint debugging result meets the test requirement.
3. The measuring process and the measuring method are as follows:
because the experiment is a reduced pressure test carried out in a sealed reduced pressure tank, the experiment has unique requirements on the acquisition and processing of experimental data. In the field of experimental study of the exhaust cavitation of the underwater vehicle, the image measuring method based on the high-speed camera shooting technology can record the complete experimental process under the condition of not generating any influence on a flow field, and very intuitively observe the development and fusion process of the exhaust cavitation and the change of a cavitation flow pattern. The high-speed camera is placed at a distance of about 1 meter away from the long observation window of the decompression tank, the shooting effect is ensured by means of a yellow head lamp,
in the specific experiment operation, the specific object of the model length is used as the characteristic length in the experiment, and the model length is selected as the characteristic length because the model and the vacuole have consistent motion in time and space. The connection between the camera and the control computer is realized through a data line and the camera software Phantom675_2, data transmission, storage and the like can be synchronously completed, the size of the cavitation bubbles can be directly measured, and the measurement of the speed is also easily realized because the time interval between every two frames of images is readable and relatively fixed.
As shown in fig. 1(c), pressure sensors are distributed at some positions on the surface of the aircraft to capture pressure characteristics in the process of exhausting the aircraft, so as to provide reference for subsequently establishing a vacuole fusion criterion. The specific distribution positions are as follows: (1) the single hole symmetrical line position-the pressure in the bubble and the closing pressure of the tail end of the bubble; (2) the pressure change of the fusion position between the air films is formed by the symmetrical line position between two holes and the adjacent holes, and before and after fusion is pre-judged, whether the pressure of the fusion position of the bubble combination is obviously changed or the whole pressure in the bubble is changed.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. The utility model provides a passive exhaust bubble fusion experimental apparatus under decompression state which characterized in that: the device comprises an underwater navigation body model, a pressure reduction system, a ventilation system, a motion system, a control system and an information acquisition system; the underwater vehicle model comprises a head region, an air cavity region and a transition region; the air cavity region comprises a first cylinder and a second cylinder; the first cylinder is arranged above the second cylinder, the first cylinder is communicated with the inner space of the second cylinder, a circle of exhaust holes are uniformly formed in the upper part of the first cylinder around the first cylinder, and a pressure sensor is arranged in the first cylinder; the head area comprises a cavitation suppression head type, and the cavitation suppression head type is arranged at the upper end of the first column body through a head sealing plate and a front baffle plate; the gas tank is arranged in the second column body, and the upper end and the lower end of the gas tank are fixed in the second column body through gas tank fixing blocks; the air inlet of the air tank is arranged at the lower end of the air tank, a one-way valve and a pressure sensor are arranged at the air inlet of the air tank, the air jet of the air tank is arranged at the upper end of the air tank, and an electromagnetic valve is arranged at the air jet of the air tank; the transition area comprises a first transition section, a second transition section and a base; the middle part of the first transition section is a cylinder, the upper end and the lower end of the first transition section are of gradually expanding structures, the upper end of the first transition section is connected with the lower end of the second cylinder, and the lower end of the first transition section is connected with the second transition section; the lower end of the second transition section is arranged on the base, and the side part of the second transition section is provided with an airfoil structure; one end of the wing-shaped structure is connected with the second transition section, and the other end of the wing-shaped structure is connected with the connecting plate; the motion system comprises a synchronous belt sliding table, and a sliding block is arranged on the synchronous belt sliding table; the pressure reducing system comprises a pressure reducing tank; the underwater navigation body model is integrally arranged in the pressure reducing tank, and a connecting plate in a transition area of the underwater navigation body model is connected with a sliding block of the synchronous belt sliding table; the ventilation system comprises an air pump, the air pump is connected with a one-way valve at the air inlet of the air tank through a ventilation pipe, and a pressure reducing valve is arranged on the ventilation pipe; the lower part of the base is provided with a hole, and wires of the pressure sensor, the electromagnetic valve and the one-way valve penetrate through the lower part of the base and are connected with a control system outside the pressure reduction tank.
2. The passive exhaust bubble fusion experimental method under the reduced pressure state of the passive exhaust bubble fusion experimental device under the reduced pressure state according to claim 1, characterized by comprising the following steps:
step 1: injecting water into the pressure reducing tank, placing the underwater navigation body model on the water surface, and setting a gas tank pressure threshold value of the underwater navigation body model through the pressure reducing valve;
step 2: opening a pressure reducing valve and an electromagnetic valve at an air injection port of an air tank in the underwater vehicle model, enabling external air to enter the air tank through an air pump and a one-way valve, and discharging the external air from an exhaust hole in the upper part of the first column body through the electromagnetic valve; after the underwater navigation body model is stabilized, the underwater navigation body model is sunk into water, and water cannot enter the air tank due to the exhaust function;
and step 3: after the underwater navigation body model reaches the designated position at the bottom of the decompression tank, closing the electromagnetic valve; at the moment, the exhaust hole at the upper part of the first column body continues to exhaust until the internal and external pressure difference is balanced, and the gas is not discharged outside any more;
and 4, step 4: decompressing the decompression tank until reaching the set environmental pressure;
and 5: observing the state of gas entering the gas tank through the pressure reducing valve, and closing the pressure reducing valve when the gas pressure in the gas tank reaches a set value to ensure that the gas in the gas tank has constant quality, so that the pressure of the gas tank is prevented from being reduced in the test process, and the pressure reducing valve is started to perform inflation operation;
step 6: and performing an experiment, controlling the electromagnetic valve at the air injection port of the motion system and the air tank through the control system, enabling the air in the air tank exhausted by the electromagnetic valve and the underwater navigation body model to move to meet the experiment requirement, and simultaneously recording the development fusion condition on the surface of the underwater navigation body model after the air is exhausted by a high-speed camera in the information acquisition system.
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| CN113835459A (en) * | 2021-09-24 | 2021-12-24 | 北京理工大学 | Intelligent ventilation control experiment method and device based on self-adaption |
| CN114427952A (en) * | 2022-01-24 | 2022-05-03 | 中国科学院力学研究所 | Bubble generation and fusion experimental device and method based on low-turbulence water tank |
| CN114659749A (en) * | 2022-02-28 | 2022-06-24 | 哈尔滨工程大学 | Planar passive ventilation navigation body model and application method thereof |
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