A Numerical Prediction Method for Tip Vortex Cavitation of Underwater Propeller
A technology of tip vortex cavitation and numerical prediction, applied in the fields of electrical digital data processing, special data processing applications, instruments, etc., can solve the problem of large patch cavitation prediction area
Active Publication Date: 2017-06-06
ANHUI UNIVERSITY OF TECHNOLOGY
View PDF3 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
In addition, Swedish researchers used the large eddy simulation method to numerically predict propeller cavitation, and the propeller tip vortex cavitation prediction results are consistent with the experimental phenomenon, but the slice cavitation prediction area is significantly larger than the experimental results
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0090] As shown in Figure 5(a), Figure 5(b), Figure 5(c) and Figure 5(d), a numerical prediction method for underwater propeller tip vortex cavitation, the specific implementation method includes the following steps:
[0091] Step 1: Use professional modeling software to establish a three-dimensional geometric model of the propeller, and import it into the meshing software.
[0092] In the second step, three alternative meshes are established in the meshing software and imported into the calculation program.
[0093] The computational domains of the three alternative grids are the same. According to the characteristics of the flow field around the propeller, a cylindrical computational domain is established, such as figure 1As shown, the velocity inflow boundary is 1.5D from the center of the propeller, D is the diameter of the propeller, the distance from the downstream pressure outlet boundary is 5D, and the distance from the center of the propeller to the side periphery is ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for forecasting numerical value of cavitation of an underwater propeller tip vortex and belongs to the field of optimized design of propellers. The method includes steps of (a) determining a basic grid; (b) determining a precision grid; (c) determining an optimal grid; (d) forecasting the cavitation of the underwater propeller tip vortex under the required working condition by means of the optimal grid. The method is used for forecasting the numerical value of the cavitation of the propeller tip vortex, and effectively forecasts tip-vortex cavitation of the E779A type propeller under different working conditions via comparison of results of related experiments, therefore, the method is of great significance in forecasting and evaluating of cavitation performance in the propeller design, design cost and period are effectively reduced, and the method is quite good in application prospect.
Description
technical field [0001] The invention relates to the field of propeller optimization design, in particular to a numerical prediction method for underwater propeller tip vortex cavitation. Background technique [0002] Propeller cavitation not only reduces propeller performance, produces cavitation erosion, and causes hull vibration, but also produces cavitation noise sufficient to expose itself. As modern ships have higher and higher requirements for load and speed, propeller cavitation is unavoidable. The tip vortex cavitation is often the earliest cavitation in the propeller, and the accurate prediction of its phenomenon can provide an important basis for the judgment of the initial cavitation. The numerical prediction of tip vortex cavitation is also one of the most difficult to achieve. Numerically capturing tip vortex cavitation and obtaining comprehensive cavitation flow field information including pressure, velocity, and flow field structure of the surrounding flow f...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 朱志峰
Owner ANHUI UNIVERSITY OF TECHNOLOGY