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Method for forecasting numerical value of cavitation of underwater propeller tip vortex

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: 2014-10-15
ANHUI UNIVERSITY OF TECHNOLOGY
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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

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  • Method for forecasting numerical value of cavitation of underwater propeller tip vortex
  • Method for forecasting numerical value of cavitation of underwater propeller tip vortex
  • Method for forecasting numerical value of cavitation of underwater propeller tip vortex

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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] Step 2: Establish three alternative meshes in the meshing software and import them into the calculation program.

[0093] The computational domains of the three alternative grids are the same, and a cylindrical computational domain is established according to the characteristics of the flow field around the propeller, 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 2.5D. The num...

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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 will not only reduce propeller performance, produce cavitation erosion, cause hull vibration, but also generate cavitation noise enough to expose itself. As modern ships have higher and higher requirements on 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 judging the incipient cavitation. Numerical prediction of tip vortex cavitation is also one of the most difficult cavitation numerical predictions. Numerically capturing the tip vortex cavitation and obtaining comprehensive cavitation flow field information including the pressure, velocity and flow field structure of the surrou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 朱志峰
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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