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Method for forecasting effects of internal waves and ventilation cavitation bubbles

A cavitation and internal wave technology, applied in the forecast field of internal wave and ventilation cavitation, can solve problems such as ventilation cavitation or cavitation influence

Active Publication Date: 2020-10-23
DALIAN UNIV OF TECH
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  • Abstract
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Problems solved by technology

However, even small speed ocean fluctuations can still have a large impact on aeration cavitation or cavitation phenomena

Method used

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  • Method for forecasting effects of internal waves and ventilation cavitation bubbles
  • Method for forecasting effects of internal waves and ventilation cavitation bubbles
  • Method for forecasting effects of internal waves and ventilation cavitation bubbles

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Embodiment Construction

[0058] In order to make the technical solutions and advantages of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the drawings in the embodiments of the present invention:

[0059] Such as figure 1 A method for forecasting the interaction between internal waves and ventilation cavities is shown, which specifically includes the following steps:

[0060] Step 1: Establish a model and calculate the watershed based on the geometric modeling method, set the diameter of the watershed to 5 times the radius of the cavitator, the incoming flow section to 0.5m, and the outgoing flow section to 0.5m, (set the frequency of the internal wave to a sine wave of 20HZ , The incoming flow section and the outgoing flow section are about 2 times the wavelength) The length of the cavitator is 0.4m. The diameter of the cavitator is 0.4m. The cavitator is placed in the center of the...

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Abstract

The invention discloses a method for forecasting the effect of internal waves and ventilation cavitation bubbles. According to the method, a navigation body model and a three-dimensional calculation basin are established on the basis of a three-dimensional geometric modeling method, calculation basin grids are divided on the basis of a grid division method, a multi-phase calculation fluid mechanics model of natural cavitation and ventilation cavitation is established, and initial boundary conditions are set for flow field numerical calculation of a three-dimensional calculation domain; when the cavitation phenomenon reaches a stable period, coupling the internal wave model, and calculating the action of the internal wave on the cavitation form and the hydrodynamic force of the flow field;and processing and analyzing the calculation result based on a post-processing program to obtain the influence of the internal wave on the cavitation form change. The method can be applied to flow field calculation of multi-phase cavitation and ventilation cavitation flow, the cavitation form and the hydrodynamic force of the flow field can be finely calculated, and the cavitation form evolution and hydrodynamic change process when the cavitation and ventilation cavitation reach the stable state and a navigation body encounters internal waves can be calculated in a numerical simulation mode.

Description

technical field [0001] The invention relates to the technical field of underwater navigation analysis, in particular to a method for predicting the interaction between internal waves and ventilation cavitation. Background technique [0002] Cavitation occurs in the low-pressure area of ​​high-speed water flow. It is a complex multi-phase flow involving intense interphase mass, momentum and energy exchange, phase transition and turbulence. The occurrence of cavitation will induce severe pressure pulsation, vibration and noise. The in-depth understanding of cavitation mechanism is the prerequisite for effectively restraining unfavorable cavitation and avoiding cavitation damage in engineering, which has important scientific significance and engineering value. Ventilation cavitation can change the shape and period of cavitation and pressure pulsation, and can improve the instability of cavitation and its side effects. Cavitation is characterized by the generation, aggregation...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F30/28G06F111/10G06F113/08G06F119/14
CPCG06F30/23G06F30/28G06F2111/10G06F2113/08G06F2119/14
Inventor 孙铁志邹丽丁言义姜胜超裴玉国
Owner DALIAN UNIV OF TECH
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