Embedded cavitation observation device for ducted propeller and observation method of embedded cavitation observation device

Abstract

The invention relates to a ducted propeller embedded cavitation observation device and an observation method thereof, the ducted propeller embedded cavitation observation device comprises a cabin body and a cabin body connected with the cabin body: a ducted shell located outside the cabin body and annularly provided with propeller blades, the ducted shell is provided with at least one observation through hole provided with a transparent cover, and an annular lamp strip for providing illumination is embedded in the inner wall of the ducted shell; and the high-speed camera is mounted in the cabin body, and accurate shooting and observation of the phenomena of the propeller blades and the cavitation bubbles around the propeller blades are realized through corresponding through holes and transparent covers on the cabin body. The propeller is compact and reasonable in structure and convenient to operate, and on the premise that the original functions of the propeller are not changed, normal operation of the propeller is ensured not to be interfered by arranging the high-speed camera, the transparent cover and the annular lamp strip. By means of the design, researchers can accurately observe the cavitation phenomenon in real time on the premise that the structure of the propeller is not damaged and the performance of the propeller is not affected, and precious physical data support is provided for optimizing the design of the propeller and improving the performance of a ship.

Description

Technical Field

[0001] The invention relates to the technical field of cavitation observation, in particular to a duct propeller embedded cavitation observation device and an observation method thereof. Background Art

[0002] In the field of ship propulsion technology, ducted propellers are a highly efficient propulsion device that significantly improves underwater driving force by placing the propeller inside the duct. They are widely used in various surface ships and submarines. However, in the actual operation of ducted propellers, the complex phenomena such as the cavitation morphology of the blades, the cavitation area, and the tip gap cavitation between the blades and the duct have a profound impact on the propulsion efficiency, noise control, and even structural safety of the propeller. Therefore, in-depth research and precise measurement of these cavitation phenomena have become a key link in improving ship performance.

[0003] Traditionally, the study of cavitation in ducted propellers mainly relies on model tests, that is, by constructing a model with the same structure as the actual ship propeller but with a reduced size ratio, the working state of the propeller is simulated in the test tank. However, this method has significant limitations. On the one hand, the scale effect causes the cavitation phenomenon in the model to be significantly different from the actual situation in the actual ship, and the change in size ratio often cannot accurately reflect the true characteristics of the cavitation in the actual ship. On the other hand, the environmental conditions of the test tank are far different from the actual marine environment, and it is impossible to fully simulate the cavitation performance of the actual ship in different scenarios, such as the influence of different flow rates, water temperatures, water quality and other factors.

[0004] In addition, observing the cavitation phenomenon of ducted propellers on real ships faces many technical challenges. Since the position of ducted propellers is limited and their normal operation must be ensured to be undisturbed, how to achieve effective observation of cavitation without destroying the propeller structure and affecting its performance has become a technical problem that needs to be solved urgently. Therefore, there is an urgent need for a cavitation observation device and method that can be embedded in a ducted propeller, which can ensure the accuracy and comprehensiveness of the observation and does not affect the normal operation of the propeller, so as to overcome the limitations of traditional model tests, realize the accurate capture and analysis of the cavitation phenomenon of real ships, and provide a scientific basis for optimizing propeller design and improving ship performance. Summary of the invention

[0005] In response to the shortcomings in the above-mentioned existing production technologies, the present application provides a ducted propeller embedded cavitation observation device and an observation method thereof. This design enables researchers to conduct real-time and accurate observation of cavitation phenomena without destroying the propeller structure or affecting its performance, providing valuable physical data support for optimizing propeller design and improving ship performance.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A ducted propeller embedded cavitation observation device, comprising a cabin and a cabin connected to the cabin:

[0008] A duct housing, which is located outside the cabin and is surrounded by propeller blades, the duct housing has at least one observation through hole equipped with a transparent cover, and an annular light strip for providing lighting is embedded in the inner wall of the duct housing;

[0009] The high-speed camera is installed inside the cabin and uses the corresponding through holes and transparent cover on the cabin to achieve accurate photography and observation of the propeller blades and the cavitation phenomenon around them.

[0010] Furthermore, a propeller assembly is arranged in the catheter housing.

[0011] Furthermore, the catheter housing is fixedly connected to the outside of the cabin through a bracket.

[0012] Furthermore, the observation through hole is a stepped hole, and the edge of the transparent cover is buckled on the stepped hole and connected by bolts, and the middle of the transparent cover is raised and flush with the inner wall of the catheter.

[0013] Furthermore, an annular groove is opened at the front edge of the inner wall of the catheter shell, the annular light strip is embedded in the annular groove, and the thickness of the annular light strip is the same as the depth of the annular groove, and the wiring harness of the annular light strip is connected to the cabin through a bracket.

[0014] Furthermore, the transparent cover is made of organic glass, and the light transmittance is ≥90%.

[0015] Furthermore, the light color of the annular light strip is yellow or white, and the light brightness is greater than 5000 lux.

[0016] Furthermore, the shooting range of the camera covers the entire propeller blade.

[0017] A method for observing cavitation embedded in a ducted propeller, which uses the above-mentioned cavitation embedded in a ducted propeller observation device, and the observation method comprises the following steps:

[0018] S1. Equipment installation: Install the circular light strip, transparent cover, and camera, and ensure that the camera can observe the full view of the propeller blades;

[0019] S2. Turn on the light source: Turn on the ring light strip to provide sufficient and uniform lighting for the observation area, and ensure that the light brightness is greater than 5000 lux, so as to clearly observe the cavitation phenomenon of the propeller blades and their surroundings;

[0020] S3. Observation process: start a high-speed camera to continuously shoot or record, observe the cavitation phenomenon generated by the propeller blades during operation in real time, and record relevant data or images;

[0021] S4. Data analysis and processing: After the observation, the captured images or video data are sorted and analyzed in combination with the operating environment and speed of the propeller blades. By comparing the cavitation phenomena at different time points, we can gain an in-depth understanding of the cavitation characteristics, causes, and possible influencing factors of the propeller blades.

[0022] Furthermore, it also includes a data acquisition system that can collect the rotation speed of the propeller blades and the operating environment of the propeller blades.

[0023] The beneficial effects of the present invention are as follows:

[0024] The present invention has a compact and reasonable structure and is easy to operate. Under the premise that the original function of the propeller remains unchanged, the normal operation of the propeller is ensured to be undisturbed by setting a high-speed camera, a transparent cover and a ring light strip. The transparent cover in the device is made of high-quality materials and equipped with a precise buckling mechanism to ensure the sealing and clarity of the observation area, avoid the interference of water infiltration on the observation, and maintain the original properties of the fluid in the duct. This design enables researchers to conduct real-time and accurate observation of cavitation without destroying the propeller structure or affecting its performance, providing valuable physical data support for optimizing propeller design and improving ship performance.

[0025] At the same time, the present invention also has the following advantages:

[0026] (1) The detection device of the present invention adopts an embedded structural design, which cleverly realizes the real-time observation of the cavitation phenomenon of the duct propeller, while ensuring that the normal operation of the propeller is not affected. Its compact structure and rigorous sealing effectively isolate the potential interference of external water flow to the observation area, ensuring the stability of the observation environment. The high light transmittance of the transparent cover combined with the precise buckling mechanism ensures the clarity and sealing of the observation field, thereby improving the accuracy and credibility of the observation results.

[0027] (2) The specially designed annular light strip in the device of the present invention provides stable and uniform lighting conditions for the observation area. This design enables the subtle changes of the propeller blades and the surrounding cavitation to be clearly observed even in an environment with insufficient light or poor water quality. This not only greatly improves the observation efficiency, but also ensures the consistency and comparability of the observation data.

[0028] (3) The observation method adopted by the present invention realizes a comprehensive and accurate record of the cavitation phenomenon through rigorous observation process and data analysis technology. The continuous shooting capability of the high-speed camera can completely capture the entire process from the generation to the disappearance of cavitation, providing valuable data resources for in-depth research on the cavitation phenomenon. At the same time, the integrated data acquisition system makes the observation process more intelligent and automated, further improving the accuracy and efficiency of the observation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0030] Figure 2 It is a cross-sectional view of the present invention.

[0031] Figure 3 for Figure 2 A partial enlarged view of part A in the middle.

[0032] Figure 4 This is an observation picture taken by the high-speed camera in the present invention.

[0033] Among them: 1. Cabin; 2. Catheter shell; 3. Observation hole; 4. Transparent cover; 5. Ring light strip; 6. High-speed camera; 7. Bracket; DETAILED DESCRIPTION

[0034] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0035] Example 1: Cavitating observation device embedded in duct propeller

[0036] This embodiment provides a ducted propeller embedded cavitation observation device 1, which aims to provide an efficient and accurate cavitation observation method to conduct in-depth research on the cavitation phenomenon generated by the ducted propeller during operation. The device 1 integrates advanced observation technology and structural design, which can ensure the accurate capture and analysis of the propeller cavitation phenomenon in a complex and changeable marine environment. The device 1 includes a cabin 1 and multiple key components connected to the cabin 1. The specific structure not only meets the basic observation needs, but also incorporates a number of innovative designs to improve the accuracy and reliability of observation.

[0037] The duct housing 2 in this embodiment is located outside the cabin 1 and tightly surrounds the propeller assembly, providing a stable working environment for the propeller. It is equipped with at least one observation through hole 3, and this design takes into account the convenience and comprehensiveness of observation. The observation through hole 3 is carefully designed as a step hole, which not only enhances the strength of the structure, but also facilitates the installation and sealing of the transparent cover 4. The transparent cover 4 is made of high-quality organic glass with a light transmittance of more than 90%, ensuring the clarity and light transmittance of the observation area. The edge of the transparent cover 4 is tightly connected to the step hole through a precise buckling mechanism and fastened by high-strength bolts. This double sealing design effectively prevents the infiltration of water flow and ensures the dryness and clarity of the observation area. In addition, the middle convex design of the transparent cover 4 not only enhances its structural strength, but also effectively reduces the direct impact of water flow on the observation area, further improving the accuracy and stability of observation.

[0038] In this embodiment, the shape of the observation through hole 3 is a square hole. At the same time, in order to facilitate the high-speed camera 6 to completely capture the propeller blades, the size of the observation through hole 3 is adaptively adjusted. In other embodiments, it can also be a through hole of other shapes.

[0039] The raised design of the transparent cover 4 also takes into account the principles of fluid mechanics. By optimizing the water flow path, the interference of the water flow on the observation line of sight is reduced, making the captured cavitation phenomenon more realistic and clear. At the same time, the material selection of the transparent cover 4 has also been strictly tested to ensure that it can resist corrosion and wear during long-term underwater work, thereby extending the service life of the observation device 1.

[0040] The annular light strip 5 in this embodiment is embedded in the front edge of the inner wall of the catheter housing 2 and is a lighting component in the observation device 1. Specifically, an annular groove is provided at the front edge of the inner wall of the catheter housing 2, and the annular light strip 5 is embedded in the annular groove. The thickness of the annular light strip 5 is the same as the depth of the annular groove, and the wiring harness of the annular light strip 5 is connected to the cabin 1 through the bracket 7. Through the fixing method of the annular groove, the annular light strip 5 can maintain the optimal distance between the observation area and ensure the maximum lighting effect.

[0041] In this embodiment, the annular light strip 5 is arranged at the front edge of the inner wall of the catheter housing 2, so that the distance between the annular light strip 5 and the propeller blade is far enough to avoid light reflection affecting the observation effect. In addition, the depth of the annular groove is the same as the thickness of the annular light strip 5, which can make the inner wall of the catheter housing 2 smooth.

[0042] The annular light strip 5 in this embodiment uses yellow or white light, usually LED light or xenon lamp. These two colors have good penetration and recognition in underwater environment, and can provide sufficient and uniform lighting for the observation area, while also maintaining sealing performance.

[0043] The illumination of the ring light belt 5 is greater than the design standard of 5000 lux. Even in dim light or turbid water, the cavitation phenomenon of the propeller blades and its surroundings can be clearly observed. In addition, the ring light belt 5 is also equipped with an intelligent dimming system, which can adjust the brightness and color according to actual observation needs to meet the observation requirements in different scenarios. The intelligent dimming system of the ring light belt 5 monitors the ambient light intensity and water quality in real time through built-in sensors, automatically adjusts the lighting parameters, and ensures that the observation area is always kept in the best lighting state. This intelligent design not only improves the observation efficiency, but also reduces energy consumption and extends the service life of the light belt. At the same time, the installation position of the ring light belt 5 has also been carefully calculated to ensure that its relative position with the propeller blades is optimal, avoiding the interference of light on the operation of the propeller, and ensuring the accuracy and safety of observation.

[0044] The high-speed camera 6 in this embodiment is installed inside the cabin 1, and can directly and accurately photograph and observe the propeller blade and the cavitation phenomenon around it through the corresponding through holes and transparent cover 4 on the cabin 1. The shooting range of the high-speed camera 6 is carefully designed to ensure that it can cover the entire propeller blade and record the generation, development and disappearance process of each cavitation phenomenon without omission.

[0045] The high-speed camera 6 in this embodiment has the characteristics of high resolution and high frame rate, which can capture subtle cavitation changes and provide high-quality image data for subsequent data analysis and research. In addition, the high-speed camera 6 is also equipped with a remote control system, which can be adjusted and controlled in real time through the control console on the shore, realizing the remote and automated observation. The remote control system of the high-speed camera 6 not only supports basic shooting parameter adjustments, such as exposure time, focal length, etc., but also has real-time image transmission and preview functions. This enables researchers to view the observation situation in real time on the shore, adjust the observation strategy in time, and improve the flexibility and efficiency of the observation. At the same time, the high-speed camera 6 also has powerful data storage and processing capabilities, and can shoot continuously for a long time without losing data, providing strong support for long-term and continuous observation experiments.

[0046] As a key component connecting the catheter housing 2 and the cabin 1, the design of the bracket 7 not only considers the stability of the device 1, but also fully considers the flexibility and convenience of observation. The bracket 7 is made of high-strength material and can withstand the huge pressure generated by the operation of the catheter housing 2 and the propeller. The hollow interior of the bracket 7 can connect the wiring harness of the annular light strip 5 to the cabin 1 to realize the power supply of the annular light strip 5.

[0047] The ducted propeller embedded cavitation observation device 1 of this embodiment realizes accurate observation and recording of the cavitation phenomenon of the propeller blades and their surroundings through a carefully designed structure and efficient observation means. Its innovative design concept and advanced technology application not only improve the accuracy and efficiency of observation, but also provide strong support for subsequent data analysis and research. The application of the device 1 will greatly promote the research progress of propeller cavitation phenomenon, and provide scientific basis and technical support for optimizing propeller design, improving propulsion efficiency, reducing noise, etc.

[0048] Example 2: Cavitating observation method embedded in duct propeller

[0049] This embodiment provides an observation method based on the duct propeller embedded cavitation observation device described in Example 1. This method can achieve comprehensive and accurate observation and research of the propeller blades and the cavitation phenomenon around them through strict observation steps and data analysis processes. This method not only provides a strong basis for optimizing propeller design and improving propulsion efficiency, but also provides more powerful support for research and application in related fields. The following is a detailed description of each step of the method:

[0050] S1. Equipment installation: As the first step of the observation method, the quality of equipment installation directly affects the subsequent observation effect. Therefore, during the installation process, it is necessary to strictly follow the design requirements to ensure that the installation position and angle of each component are accurate. First, when installing the annular light strip, ensure the optimal distance between its position and the observation area, and fix it through the annular groove to prevent the light strip from moving or shaking during the observation process. Next, when installing the transparent cover, carefully check the fit between its edge and the step hole to ensure good sealing, and tighten it with bolts to prevent water from infiltrating. Finally, when installing the high-speed camera, repeatedly debug and confirm its installation position and angle to ensure that the full view of the propeller blade can be observed and the shooting range covers the entire propeller blade. During the installation process, it is also necessary to pay attention to the connection method and tightening degree between the components to ensure that the device will not loosen or fall off during operation. In addition, in order to ensure the continuity and stability of the observation, it is also necessary to debug and test the device as a whole, check the working status and mutual coordination of each component, and ensure that the device can work normally and meet the observation requirements.

[0051] S2. Turn on the light source: The light source is one of the key factors in observing the cavitation phenomenon. Before turning on the ring light strip, you need to make sure that it is working properly and is not damaged or aged. After turning on the ring light strip, adjust the brightness and color of the light strip according to actual needs to ensure that the light brightness is greater than 5000lux to meet the observation needs. During the observation process, pay close attention to the lighting effect. If you find insufficient lighting or uneven light, adjust the position of the light strip or add auxiliary light sources in time to ensure the clarity and recognition of the observation area. The brightness and color adjustment of the ring light strip can be achieved through an intelligent dimming system, which can automatically adjust the lighting parameters according to the ambient light intensity and water quality to ensure that the observation area is always kept in the best lighting state. In addition, in order to extend the service life of the light strip and reduce energy consumption, you can also set a timer switch or a light sensor switch so that the light strip automatically turns off or reduces the brightness when observation is not required.

[0052] S3. Observation process: The observation process is the core of the whole method. Before starting the high-speed camera for continuous shooting or recording, it is necessary to ensure that it is in normal working condition and the shooting parameters have been adjusted. During the observation process, pay close attention to the operation of the propeller blades and the generation, development and disappearance of the cavitation phenomenon to ensure that all key information can be captured. In order to obtain more comprehensive and accurate observation data, a multi-angle and multi-level observation method can be adopted to change the observation angle and range by adjusting the height and angle of the bracket. During the observation process, attention should also be paid to the stability and safety of the observation environment. Especially when observing in the marine environment, pay close attention to changes in weather and sea conditions to ensure the safety of observation equipment and personnel. At the same time, in order to reduce the interference of water flow on observation, guide plates or water baffles can be set around the observation area to make the water flow more stable and uniform. In addition, in order to improve the efficiency and accuracy of observation, an automated observation system can also be used to realize the automation and intelligence of the observation process through preset programs and algorithms.

[0053] like Figure 4 As shown in the figure, it can be known that through the observation device of the present invention and the corresponding observation method, the cavitation phenomenon of the propeller blade can be clearly seen.

[0054] S4. Data analysis and processing: After the observation, the captured images or video data are sorted and analyzed in combination with the operating environment, operating speed and other data of the propeller blades. This step is the key to understanding the cavitation phenomenon and its impact on propeller performance. First, use professional image processing software to analyze the captured video frames frame by frame, and mark the location, size, morphological changes and other information of the cavitation. Through time series analysis, the whole process from the generation to the disappearance of cavitation can be tracked to reveal its dynamic characteristics. In addition, combined with the principles of fluid mechanics, the formation mechanism of cavitation is theoretically modeled, and the actual observation data is compared with the model prediction results to further verify the accuracy of the model and adjust the model parameters to better meet the actual situation. This method of combining theory and experiment helps to deeply explore the physical mechanism behind the cavitation phenomenon and provide a scientific basis for the optimal design of propellers. At the same time, by analyzing the distribution and change law of cavitation at different operating speeds, the specific impact of speed on cavitation characteristics can be evaluated, providing data support for determining the optimal operating speed range. In addition, considering the influence of environmental factors such as water temperature and water quality on cavitation, the intensity of these factors can be quantified through multivariate regression analysis, providing a reference for the adaptive design of propellers under different environmental conditions.

[0055] In this embodiment, a data acquisition system is also equipped, and environmental parameters such as the rotation speed, water temperature, and flow rate of the propeller blades are collected simultaneously during the observation process. These data not only provide more comprehensive and accurate support for in-depth research on the relationship between cavitation and propeller performance, but also greatly enrich the dimension and depth of the research. The data acquisition system usually includes high-precision sensors, data recorders, and data analysis software. The sensor is responsible for real-time monitoring of various parameters, such as measuring the rotation speed of the propeller through a laser velocimeter, using a temperature sensor to monitor water temperature changes, and using a tachometer to measure water flow velocity. The data recorder is responsible for recording these raw data in a high-frequency and high-precision manner, providing a detailed data basis for subsequent analysis. The data analysis software can perform preprocessing, statistical analysis, correlation analysis, etc. on these data to help researchers discover potential connections between parameters, such as the correlation between cavitation frequency and rotation speed, or the effect of water temperature changes on cavitation size. In addition, the data acquisition system can also realize remote monitoring and fault warning functions. By setting thresholds, when a certain parameter is abnormal, the system can automatically send an alarm, allowing maintenance personnel to respond quickly, effectively preventing safety accidents and equipment damage, and ensuring the stable operation of the propeller system.

[0056] The embedded cavitation observation method of the ducted propeller of this embodiment, through strict observation steps and data analysis processes, not only realizes the comprehensive and accurate observation and research of the cavitation phenomenon of the propeller blades and their surroundings, but also provides strong technical support for optimizing the propeller design and improving the propulsion efficiency. The method has a wide range of applications. It is not only suitable for the propeller performance evaluation of underwater vehicles such as ships and submarines, but can also be extended to wind power generation, water pump efficiency improvement and other fields. It is of great significance to promote the development of fluid machinery technology. Through continuous data accumulation and in-depth analysis, a database between propeller performance and cavitation phenomenon can be established to provide data-driven design guidance for the design of new propellers in the future, shorten the research and development cycle, and reduce development costs. At the same time, the method also promotes interdisciplinary cooperation, such as the integration of fields such as fluid mechanics, materials science, and information technology, provides new ideas and new methods for solving complex fluid dynamics problems, and promotes the development and progress of related disciplines.

[0057] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A ducted propeller embedded cavitation observation device, characterized in that: Including the connection between cabins: A duct shell is located outside the cabin and is surrounded by propeller blades. The duct shell has at least one observation through hole equipped with a transparent cover, and the inner wall of the duct shell is embedded with a ring-shaped light strip for providing lighting; a high-speed camera is installed inside the cabin, and through the corresponding through holes and transparent cover on the cabin, accurate shooting and observation of the propeller blades and the cavitation phenomenon around them can be achieved.

2. A ducted propeller embedded cavitation observation device as claimed in claim 1, characterized in that: A propeller assembly is arranged in the catheter housing.

3. The ducted propeller embedded cavitation observation device according to claim 1, characterized in that: The catheter housing is fixedly connected to the outside of the cabin through a bracket.

4. The ducted propeller embedded cavitation observation device according to claim 1, characterized in that: The observation through hole is a stepped hole, and the edge of the transparent cover is buckled on the stepped hole and connected by bolts, while the middle of the transparent cover is raised and flush with the inner wall of the catheter.

5. The ducted propeller embedded cavitation observation device according to claim 3, characterized in that: An annular groove is provided at the front edge of the inner wall of the catheter housing, the annular light strip is embedded in the annular groove, and the thickness of the annular light strip is the same as the depth of the annular groove. The wiring harness of the annular light strip is connected to the cabin through a bracket.

6. A ducted propeller embedded cavitation observation device according to any one of claims 1 to 5, characterized in that: The transparent cover is made of organic glass, and its light transmittance is ≥90%.

7. A ducted propeller embedded cavitation observation device as claimed in claim 6, characterized in that: The light color of the annular light strip is yellow or white, and the light brightness is greater than 5000 lux.

8. A ducted propeller embedded cavitation observation device as claimed in claim 7, characterized in that: The shooting range of the camera covers the entire propeller blade.

9. A method for observing cavitation in a ducted propeller, characterized in that: It adopts the duct propeller embedded cavitation observation device as claimed in claim 8, and the observation method comprises the following steps: S1. Equipment installation: Install the circular light strip, transparent cover, and camera, and ensure that the camera can observe the full view of the propeller blades; S2. Turn on the light source: Turn on the ring light strip to provide sufficient and uniform lighting for the observation area, and ensure that the light brightness is greater than 5000 lux, so as to clearly observe the cavitation phenomenon of the propeller blades and their surroundings; S3. Observation process: start a high-speed camera to continuously shoot or record, observe the cavitation phenomenon generated by the propeller blades during operation in real time, and record relevant data or images; S4. Data analysis and processing: After the observation, the captured images or video data are sorted and analyzed in combination with the operating environment and speed of the propeller blades. By comparing the cavitation phenomenon at different time points, we can gain an in-depth understanding of the cavitation characteristics, causes, and possible influencing factors of the propeller blades.

10. A ducted propeller embedded cavitation observation method according to claim 9, characterized in that: It also includes a data acquisition system capable of collecting the rotation speed of the propeller blades and the operating environment of the propeller blades.

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