CN112595490B - Resistance testing method and device for supercavitation underwater high-speed moving body - Google Patents
Resistance testing method and device for supercavitation underwater high-speed moving body Download PDFInfo
- Publication number
- CN112595490B CN112595490B CN202011457595.5A CN202011457595A CN112595490B CN 112595490 B CN112595490 B CN 112595490B CN 202011457595 A CN202011457595 A CN 202011457595A CN 112595490 B CN112595490 B CN 112595490B
- Authority
- CN
- China
- Prior art keywords
- motion
- model
- moving
- motion model
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
Abstract
The invention belongs to the field of hydromechanics, and particularly discloses a method and a device for testing the resistance of a supercavity underwater high-speed moving body. The method comprises the following steps: manufacturing a motion model of an object to be measured and heating the motion model to Leidenfrost temperature; releasing the heated motion model in water at a preset temperature, and simulating a supercavitation underwater high-speed motion process of the object to be detected through a falling experiment; and shooting the motion image of the motion model in water, and calculating the resistance borne by the motion model in the falling process according to the motion image. According to the invention, the motion model is heated to Leidenfrost temperature and then released into water, so that the effect of supercavitation is achieved, the requirement on the speed of the motion model is greatly reduced, the resistance borne by the motion model in the falling process is further obtained through cavitation number, the underwater high-speed motion state can be simulated in a limited environment at a lower cost, and the requirement on the number of frames shot by a measuring device per second is reduced.
Description
Technical Field
The invention belongs to the field of hydromechanics, and particularly relates to a method and a device for testing resistance of an underwater high-speed moving body based on high-temperature phase change.
Background
With the increasing speed of the attack target, the research and engineering development of the supercavitation underwater high-speed moving body are more and more important in the military field. For research and engineering development of underwater high-speed moving bodies, it is of utmost importance to reduce the resistance to increase the speed, and in the process of improvement, the most important is to measure the resistance.
It is difficult to measure the resistance of these very large supercavity underwater high-speed moving bodies. At present, a commonly used method for measuring the resistance of a supercavitation underwater vehicle is a strain balance test method based on a high-speed water tunnel and a cavitator. The strain balance testing method is characterized in that an experimental model is connected with a strain balance, the fluid impacts the experimental model to generate stress, and the stress is converted into an electric signal through a resistance strain gauge and output to obtain an intuitive stress value and obtain a resistance value. Although the method is simple to operate, the method has high requirements on the matching and the linking of experimental equipment and instruments, and the supports and the pipelines can influence the formation of a flow field and supercavity so as to influence the measurement of the resistance under the real condition.
Disclosure of Invention
In view of the above-mentioned drawbacks and/or needs for improvement in the prior art, the present invention provides a method and an apparatus for testing the resistance of a supercavitation underwater high-speed moving body, wherein the method heats a moving model to a Leidenfrost temperature, and releases the moving model in water at a preset temperature to simulate the supercavitation underwater high-speed moving process of an object to be tested, so as to perform a resistance test, thereby being capable of simulating an underwater high-speed moving state in a limited environment at a low cost, and greatly reducing the requirement for the number of frames per second taken by a measuring apparatus.
In order to achieve the purpose, the invention provides a resistance testing method of a supercavitation underwater high-speed moving body, which comprises the following steps:
s1, making a motion model of the object to be measured, and heating the motion model to Leidenfrost temperature;
s2, releasing the heated motion model in water at a preset temperature, and simulating a supercavitation underwater high-speed motion process of the object to be detected through a falling experiment;
s3, shooting the moving image of the moving model in water, and calculating the resistance of the moving model in the falling process according to the moving image, thereby completing the resistance test of the supercavity underwater high-speed moving body.
Further preferably, in step S1, a tail rudder is connected to the rear of the motion model to avoid the motion model from turning over.
As a further preference, in step S1, the motion model is prepared using a 3D printing technique.
As a further preferable mode, in step S1, the material of the motion model is steel and tungsten carbide.
According to another aspect of the present invention, there is provided a resistance test apparatus for a super-vacuole underwater high-speed moving body, the apparatus including a tank, a firing unit, a heating unit, and a measuring unit, wherein: the liquid storage tank is a transparent tank body with an opening at the upper end, and water is filled in the liquid storage tank; the launching unit is arranged on the outer side of the liquid storage tank and used for clamping and launching the moving model; the heating unit is used for heating water in the liquid storage tank to a preset temperature and heating the motion model to a Leidenfrost temperature; the measuring unit is arranged on the outer side of the liquid storage tank and used for recording the falling process of the motion model in the liquid storage tank.
As a further preference, the heating unit includes a liquid heating assembly for heating the water in the reservoir to a preset temperature and a motion model heating assembly for heating the motion model to a Leidenfrost temperature.
It is further preferred that the measurement unit comprises a camera assembly with which a moving image of the motion model in the water is taken during operation.
Generally, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:
1. the invention provides a method for testing the resistance of a supercavity underwater high-speed moving body, which comprises the steps of obtaining a moving model of an object to be tested, heating the moving model to Leidenfrost temperature, and then releasing the heated model into water, so that a water vapor layer is formed around the moving model to wrap the moving model, the supercavity effect is achieved, the requirement on the speed of the moving model is greatly reduced, and the resistance borne by the moving model in the falling process is further obtained through a moving image in the falling process; the device can simulate the supercavitation underwater high-speed motion state of the object to be measured in a limited environment at a low cost, and greatly reduces the requirement on the number of frames shot by a measuring device per second, so as to solve the dilemma of measuring the resistance of the supercavitation underwater high-speed motion body, and can sequentially, quickly and accurately measure the resistance of underwater high-speed motion bodies with different shapes in the future, thereby reducing the research cost of underwater vehicles and underwater missiles and promoting the further development of underwater resistance reduction research;
2. meanwhile, the risk of overturning of the motion model in the falling process is considered, and the overturning can cause great influence on the test result, so that the tail rudder is connected behind the motion model, a certain distance is ensured between the tail rudder and the front end of the motion model, other interference except resistance is generated on the motion of the front end, and the resistance generated by the tail rudder can be obtained by calculating a resistance coefficient, so that the test accuracy is ensured while the overturning is avoided;
3. in addition, the invention provides a resistance testing device of a supercavitation underwater high-speed moving body, which can effectively reduce the difficulty of resistance detection of the underwater high-speed moving body and has the advantages of simple operation and high repeatability.
Drawings
FIG. 1 is a schematic diagram of a resistance testing apparatus for a super-vacuolated underwater high-speed moving body constructed in accordance with a preferred embodiment of the present invention;
fig. 2 is a schematic view of a motion model provided with a tail rudder according to a preferred embodiment of the present invention.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
1-a first camera, 2-a second camera, 3-a liquid storage tank, 4-a liquid heating component, 5-a buffer layer, 6-a motion model, 7-a launching tube, 8-a launcher, 9-a fixed support, 10-a motion model heating component, 11-a liquid level, 12-water, 13-a tail rudder, 14-a connecting bolt, 15-a middle part of the motion model and 16-a head of the motion model.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The supercavity is characterized in that a relatively stable bubble generated on a boundary of a surrounding fluid is fixed to exceed the size of the surrounding fluid, and the tail of the supercavity jumps away from the surrounding fluid to wrap the whole moving body. Typically, cavitators and high velocity fluids are required to achieve this. But the Leidenfrost effect can greatly reduce the movement speed to realize the supercavitation phenomenon. The Leidenfrost effect is a phenomenon that liquid drops can exist on the surface of high-temperature metal for a long time, and is essentially that a water vapor layer is generated on one side of liquid close to the metal to cover the metal due to the fact that the temperature is sharply increased, the heat conduction capability of gas is poor, and therefore the liquid on the vapor layer can exist for a long time. When the droplet is present at a higher temperature for the longest period of time, the temperature is the Leidenfrost point, or Leidenfrost temperature (the liquid also has a corresponding temperature). The Leidenfrost effect is most obvious when the metal moving body is heated to the temperature, and a water vapor layer is formed around the moving body to wrap the moving body, so that the effect of supercavitation is achieved.
The principle of similarity in fluid mechanics is that if the same-name physical quantities at corresponding points of two fluids have respective fixed proportional relationships, the two flows are similar, including geometric similarity, motion similarity, dynamic similarity, and initial and boundary conditions. For the supercavitation motion of objects with similar geometric shapes, under the condition of a high enough Reynolds number, the influence of the change of the Reynolds number on the resistance coefficient is very limited, and the similarity of motion and power is essentially ensured due to the same cavitation number and the similar form of cavitation bubbles, so the resistance coefficients are the same. Under the Leidenfrost effect, the Leidenfrost and liquid can be heated to the corresponding Leidenfrost temperature by using a sphere, and then vertically enter water at a certain speed, so that the cavitation resistance coefficient under the corresponding condition can be obtained through the corresponding equivalent mass and cavitation resistance equation.
The coefficient of motion resistance for a high-speed object submerged surrounded by cavitation bubbles is primarily determined by the cavitation number of its motion. The cavitation number reflects the ratio of the energy required for the medium (e.g., water) surrounding the object to undergo a phase change upon vaporization to the kinetic energy of the medium as the object moves relative to the medium. In order to form larger cavitation bubbles, the moving object is required to have higher moving speed, and the medium with the temperature close to the boiling point of water is adopted to replace cold water, so that the requirement on the speed of the moving object can be greatly reduced. Meanwhile, the Leidenfrost effect is utilized in the method, the moving body is heated to the Leidenfrost temperature and then is released in water, and the formed steam layer can greatly reduce the moving resistance of the moving body, increase the moving speed of the moving body, so that the test effect is more authentic and has practical value.
As shown in fig. 1, an embodiment of the present invention provides a method for testing the resistance of a supercavitation underwater high-speed moving body, including the following steps:
s1, shooting an image formed by the motion of an object to be detected in water, analyzing the motion characteristics of the image, and manufacturing a motion model 6 by 3D printing according to the shape of a cavity in the image, wherein the motion model 6 is made of steel, tungsten carbide and other metal substances capable of reaching Leidenfrost;
s2, heating the motion model 6 obtained in the step S1 to Leidenfrost temperature, then releasing the motion model in water close to the boiling point temperature, for example, releasing the motion model in water at 96-99 ℃, and simulating the supercavitation underwater high-speed motion process of the object to be detected through a falling experiment;
s3 shooting the moving image of the moving model 6 in water, and calculating the resistance of the moving model in the falling process according to the moving image, for the supercavitation motion of the object with similar geometric shape, the similarity of motion and power is essentially guaranteed due to the same cavitation number and the similar form of cavitation, and therefore the resistance coefficients are also the same, so that the resistance test of the supercavitation underwater high-speed moving body can be completed.
Further, as shown in fig. 2, in step S1, since the object to be tested and the motion model 6 are at risk of overturning during the falling process, and the overturning would cause a large error to the test result, the overturning can be suppressed as follows: for an object to be detected such as a conical head body, a tail rudder with a certain length can be added behind a slender threaded rod to delay the hydrodynamic center of the object to be detected and stably fall; for the motion model 6, a tail rudder 13 can be connected to the rear of the motion model 6 through a connecting bolt 14, the tail rudder 13 has a certain distance from the motion model 6, so that the tail rudder does not generate interference except resistance increase on the motion of the motion model 6, and the resistance generated by the tail rudder 13 can be obtained by calculating a resistance coefficient, thereby ensuring the accuracy of the resistance test.
By the method, the resistance characteristics of underwater high-speed moving bodies in different shapes can be obtained, the reduction degree of cavitation generated on the resistance can be compared, and the method has a great effect on the resistance reduction of underwater moving bodies such as aircrafts and the like.
According to another aspect of the present invention, there is provided an apparatus for implementing the above-mentioned resistance test of an underwater high-speed moving body based on high-temperature phase change, the apparatus comprising a liquid storage tank 3, a launching unit, a heating unit and a measuring unit, wherein: the liquid storage tank 3 is a transparent tank body with an opening at the upper end, water 12 is contained in the liquid storage tank, and a buffer layer 5 is arranged at the bottom of the liquid storage tank; the launching unit is arranged on the outer side of the liquid storage tank 3 and used for clamping, fixing and launching the motion model, the launching unit comprises a launching tube 7, a launcher 8 and a fixed support 9, and the fixed support 9 is a cantilever frame with adjustable height so as to adjust the input height of the motion model; the heating unit is used for heating the water 12 in the liquid storage tank and the motion model 6; the measuring unit is arranged on the outer side of the liquid storage tank and used for recording the falling process of the motion model.
Further, the heating unit comprises a liquid heating assembly 4 and a moving pattern heating assembly 10, wherein the liquid heating assembly 4 is used for heating water in the liquid storage tank, preferably a liquid electric heater, and the moving pattern heating assembly 10 is used for heating the moving pattern 6 to the Leidenfrost temperature, preferably an industrial oven. The measuring unit comprises a first camera 1 and a second camera 2, the first camera 1 is flush with the liquid level 11, the second camera 2 is located at the bottom of the liquid storage tank and arranged upwards, and the first camera 1 and the second camera 2 are used for shooting the moving images of the moving model in water during work.
The technical solution provided by the present invention is further explained below according to a specific embodiment, taking a conical head type object to be measured as an example:
(1) the bottom surfaces of the steel and the tungsten carbide are respectively 10mm, 20mm and 30mm in diameter D and H in height-diameter ratio1A cone-head-shaped elongated body with/D of 1, 1.5, 2, 2.5, 3 as a sports model 6, comprising a sports model head 16 and a sports model intermediate portion 15, H1The value of the method can be obtained by selecting a value which can enable the conical head type object to be detected to fall most stably and have the most obvious phenomenon from 10 mm-30 mm through experiments;
(2) fixing an experimental device, wherein a fixing device with adjustable height is arranged on the left side, a liquid storage tank is arranged on the right side, and an industrial oven and a high-speed camera are arranged at the same time;
(3) a cone head type test object drop experiment was performed, experimental group a (cone head type test object made of steel/tungsten carbide heated to Leidenfrost temperature released in 96 ℃ water): injecting water into the liquid storage tank, heating to 96 ℃, and preserving heat; standing for a period of time to ensure that the water surface has no fluctuation so as to avoid influencing the experiment; adjusting and setting the high-speed camera to align the high-speed camera to the liquid storage tank; heating a conical head-shaped object to be detected made of steel/tungsten carbide in an industrial oven to 435 ℃ or higher, taking out the conical head-shaped object by using tweezers, fixing the conical head-shaped object on a fixing device above a liquid storage tank box, enabling a conical sphere to naturally vertically fall without an initial speed, shooting an animation of the conical sphere moving in water by using a high-speed camera, repeating the experiment for 3-5 times, and exporting a video;
experimental group B (release of conical head-shaped objects to be tested made of steel/tungsten carbide heated to Leidenfrost temperature in fluorocarbon at room temperature): injecting PP1 (fluorocarbon) into the liquid storage tank, and standing for a period of time to ensure that the liquid level of the fluid does not fluctuate so as to avoid influencing the experiment; adjusting and setting the high-speed camera to align the high-speed camera to the liquid storage tank; heating a conical head-shaped object to be detected made of steel/tungsten carbide to 265 ℃ or higher in an industrial oven, taking out the object by using tweezers, and fixing the object on a fixing device above a liquid storage tank; enabling the cone head type object to be measured to naturally and vertically fall without initial speed, and shooting animation of the cone head type object moving in water by using a high-speed camera; repeating the experiment for 3-5 times, and exporting the video;
(4) exporting the video, slowing down the video by using corresponding software, fitting the shape of a cavity by using a high-power amplified snapshot and a three-section fitting curve of a spherical cavity, estimating the volume Vc of the cavity, performing 3D printing on the shape of the formed cavity, and printing the shape of the cavity into a solid moving object which is hollow and can be filled with a heavy object to obtain a motion model;
(5) dropping the motion model in water: filling metal substances into the solid moving object to change the density of the metal substances, so that the final moving speed of the moving object with the vacuoles is the same; the motion model is fixed above the liquid storage tank, and is made to fall statically, and a high-speed camera is used for shooting the motion image of the motion model in water. The experiment was repeated 3-5 times.
(6) Data processing: firstly, the descending speed U is determined by image processing of video clips, and cavity characteristic parameters (cavity height L and maximum diameter D) are measured and recorded by performing a piecewise fitting function (cavity front end, cavity tail part and cavity maximum diameter, cavity nose part) on each axisymmetric cavity shapeS) And calculating the volume V of each conical head type object to be measuredSAnd its corresponding vacuole volume VC(ii) a ② calculating VC/VSAnd ρS/ρ(ρSDensity of a conical metal body, rho is fluid density) and records and fills in a table, a scatter diagram under each height-diameter ratio is drawn according to the table, and the buoyancy of the object in water is judged by comparison; calculating LD2And VCAnd recording the filled table, drawing a scatter diagram under each aspect ratio according to the table, and drawing a bottom surface diameter V with different aspect ratios for the same aspect ratioCAnd LD2Have the same expression relation; fourthly, for each conical head type object to be measured with the bottom surface diameter and the height-diameter ratio, calculating the resistance coefficient C of the falling of the cavitation bubble and the corresponding 3D printing motion model according to a formulaDCalculating the falling Reynolds number Re of the cavitation bubbles and the corresponding 3D printing motion model according to a formula, recording a filling table, and drawing a scatter diagram under each high-diameter ratio according to the table; and the difference between the conical head type object to be detected and the motion model when falling can be obtained through analysis by the scatter diagram.
The method can obtain the resistance of the moving bodies with different shapes when moving underwater at high speed, thereby obtaining the resistance of the moving bodies moving underwater at high speed without needing a wide space and expensive high-speed water holes or high-speed projectiles. The Leidenfrost principle is applied to greatly reduce the resistance of the moving body in underwater motion, the underwater high-speed motion state is simulated in a limited environment at low cost, the requirement on the number of frames per second shot by a high-speed camera is greatly reduced, and the resistance of the moving body can be measured easily.
Meanwhile, the 3D motion model with the same shape and size as the vacuole formed in the falling process of the motion body is manufactured through numerical fitting and a 3D printing technology, and the characteristics of the motion body in the falling process are obtained through comparing the falling condition of the 3D motion model in liquid with the falling condition of the motion body.
The method judges the resistance conditions of the object to be detected and the 3D motion model in the falling process by calculating the resistance coefficient and the cavitation number, and has convenient operation and strong result reliability. The drag reduction amount brought by the cavitation effect is accurately and quantitatively given through measuring the resistance of the cavitation object and comparing the resistance with the shape of the cavitation-free streamline. Meanwhile, the method has the advantages of simplicity, convenience, rapidness, economy and reliability, solves the problem of difficulty in measuring the resistance of underwater high-speed moving objects, and can quickly and accurately measure the resistance of underwater high-speed moving objects with different shapes in the future, so that the research cost of underwater vehicles, underwater missiles and the like can be reduced, and the further development of underwater drag reduction research is promoted.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. A method for testing the resistance of a supercavitation underwater high-speed moving body is characterized by comprising the following steps:
s1, shooting an image formed by the motion of the object to be measured in water, manufacturing a motion model (6) by 3D printing according to the shape of a cavity bubble in the image, and heating the motion model to Leidenfrost temperature;
s2, releasing the heated motion model (6) in water at 96-99 ℃, and simulating the supercavitation underwater high-speed motion process of the object to be detected through a falling experiment;
s3 shooting the moving image of the moving model (6) in water, and calculating the resistance borne by the moving model (6) in the falling process according to the moving image, thereby completing the resistance test of the supercavity underwater high-speed moving body.
2. The method for testing the resistance of a super-vacuole underwater high-speed moving body according to claim 1, wherein in step S1, a tail rudder (13) is connected to the rear of the moving model to avoid the moving model (6) from turning over.
3. The method for testing the resistance of a super-vacuole underwater high-speed moving body according to claim 1, wherein in step S1, the moving model (6) is made of steel and tungsten carbide.
4. The utility model provides a resistance test device of supercavitation high speed motion body under water, its characterized in that, the device includes liquid reserve tank (3), transmission unit, heating unit and measuring unit, wherein: the liquid storage tank (3) is a transparent tank body with an opening at the upper end, and water (12) is filled in the liquid storage tank; the launching unit is arranged on the outer side of the liquid storage tank and used for clamping and launching the moving model (6); the heating unit is used for heating the water in the liquid storage tank to 96-99 ℃, and simultaneously is also used for heating the motion model (6) to Leidenfrost temperature; the measuring unit is arranged on the outer side of the liquid storage tank and used for recording the falling process of the motion model in the liquid storage tank (3); the motion model (6) is obtained by shooting an image formed by the motion of an object to be detected in water and utilizing 3D printing according to the shape of a cavity bubble in the image.
5. The resistance test device of a supercavitation underwater high-speed moving body according to claim 4, wherein the heating unit comprises a liquid heating assembly (4) and a motion model heating assembly (10), wherein the liquid heating assembly (4) is used for heating the water (12) in the tank (3), and the motion model heating assembly (10) is used for heating the motion model (6) to Leidenfrost temperature.
6. The resistance test device of a supercavitation underwater high-speed moving body according to claim 4 or 5, characterized in that the measuring unit comprises a first camera (1) and a second camera (2), and the first camera (1) and the second camera (2) are used for simultaneously shooting the moving images of the moving model (6) in water during operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011457595.5A CN112595490B (en) | 2020-12-10 | 2020-12-10 | Resistance testing method and device for supercavitation underwater high-speed moving body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011457595.5A CN112595490B (en) | 2020-12-10 | 2020-12-10 | Resistance testing method and device for supercavitation underwater high-speed moving body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112595490A CN112595490A (en) | 2021-04-02 |
| CN112595490B true CN112595490B (en) | 2022-04-12 |
Family
ID=75192810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011457595.5A Active CN112595490B (en) | 2020-12-10 | 2020-12-10 | Resistance testing method and device for supercavitation underwater high-speed moving body |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112595490B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113588497B (en) * | 2021-08-02 | 2024-02-23 | 安徽工程大学 | Experimental device for be used for studying drop evolution process under impact effect |
| CN114087932B (en) * | 2021-09-03 | 2023-09-01 | 南京理工大学 | Kalman filtering and ballistic equation fusion-based three-dimensional ballistic fitting method in water |
| CN114813035B (en) * | 2022-04-12 | 2023-03-21 | 厦门大学 | Thermal surface cavitation synergistic resistance reduction test device and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013187674A1 (en) * | 2012-06-12 | 2013-12-19 | 한국과학기술연구원 | Supercavitating underwater vehicle |
| CN108956087A (en) * | 2018-04-13 | 2018-12-07 | 哈尔滨工程大学 | High speed water outlet sail body bubbling crystallzation multiphase flow feature measurement experimental provision and method |
| CN109253946A (en) * | 2018-11-23 | 2019-01-22 | 大连民族大学 | A kind of transparency liquid alternating temperature adhesive tape coefficient measuring method based on video |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8983019B2 (en) * | 2010-08-31 | 2015-03-17 | Massachusetts Institute Of Technology | Superwetting surfaces for diminishing leidenfrost effect, methods of making and devices incorporating the same |
-
2020
- 2020-12-10 CN CN202011457595.5A patent/CN112595490B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013187674A1 (en) * | 2012-06-12 | 2013-12-19 | 한국과학기술연구원 | Supercavitating underwater vehicle |
| CN108956087A (en) * | 2018-04-13 | 2018-12-07 | 哈尔滨工程大学 | High speed water outlet sail body bubbling crystallzation multiphase flow feature measurement experimental provision and method |
| CN109253946A (en) * | 2018-11-23 | 2019-01-22 | 大连民族大学 | A kind of transparency liquid alternating temperature adhesive tape coefficient measuring method based on video |
Non-Patent Citations (4)
| Title |
|---|
| Cavity formation by the impact of Leidenfrost spheres;J. O. Marston 等;《Fluid Mechanics》;20121231;第699卷(第5期);全文 * |
| Downward jetting of a dynamic Leidenfrost drop;Sang-Hyeon Lee 等;《PHYSICAL REVIEW FLUIDS》;20200717;全文 * |
| Simulations of saturated boiling heat transfer on bio-inspired two-phase heat sinks by a phase-change lattice Boltzmann method;Xiaojing Ma 等;《International Journal of Heat and Mass Transfer》;20180802;全文 * |
| 加热球体入水空泡实验研究;李佳川 等;《物理学报》;20161031;第65卷(第20期);正文第2-4节 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112595490A (en) | 2021-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112595490B (en) | Resistance testing method and device for supercavitation underwater high-speed moving body | |
| Mehdi-Nejad et al. | Air bubble entrapment under an impacting droplet | |
| Schneider | Hypersonic boundary-layer transition with ablation and blowing | |
| Yoon et al. | Direct numerical simulation of droplet collision with stationary spherical particle: A comprehensive map of outcomes | |
| Lu et al. | Numerical study on the water-entry of asynchronous parallel projectiles at a high vertical entry speed | |
| Cameron et al. | An experiment for the study of free-flying supercavitating projectiles | |
| Taligoski et al. | Effect of roll orientation on the vortex asymmetry on a conical forebody | |
| Soh et al. | The entrainment of air by water jet impinging on a free surface | |
| Zhao et al. | Experimental study on ballistic stability of truncated cone projectile in high-speed oblique water entry | |
| Guo et al. | Numerical investigation of the influence of surface wettability on water entry of spheres | |
| Yang et al. | Experimental study on pool boiling of distilled water and HFE7500 fluid under microgravity | |
| Jafari et al. | Experimental analysis of water entry problem considering hollow cylinders: The impact of hole geometry | |
| CN210464190U (en) | Be used for penetration weapon electronic system mechanics equivalent test device | |
| LIU et al. | Effect of rifle bullet parameters on the penetration into ballistic gelatin | |
| Zhang et al. | Prediction of the hydrodynamic disturbance characteristics for two projectiles launched successively underwater based on the radial basis function neural network | |
| Schwalbach et al. | Effect of impact velocity and mass ratio during vertical sphere water entry | |
| Rabiee et al. | Experimental investigation of bounce phenomenon | |
| Pokela et al. | Aerodynamic Characterization of a Generic High-Speed Projectile Configuration | |
| Sampath Kumar et al. | Experimental and Numerical Investigation of the Vortex Asymmetry on the Basic Finner Configuration | |
| Seiler et al. | Heat fluxes inside a cavity placed at the nose of a projectile measured in a shock tunnel at Mach 4.5 | |
| Zhuang et al. | Effects of the launch parameters on trans-phase stability performance and mechanism for submarine-launched missiles model | |
| Neely et al. | Determining aerodynamic coefficients from high speed video of a free-flying model in a shock tunnel | |
| Mifsud et al. | A case study on the aerodynamic heating of a hypersonic vehicle | |
| Kumar et al. | Forebody Articulation at High Angles of Incidence | |
| Roy et al. | Estimation of numerical error for 3D inviscid flows on Cartesian grids |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |