Method for constructing water entry cavitation evolution model of large slenderness ratio revolving body

Abstract

The invention provides a method for constructing a water entry cavitation evolution model of a large-slenderness-ratio rotary body, which comprises the following steps of: arranging a cavitator at the head part of the large-slenderness-ratio rotary body, and establishing a steady cavitation model of the large-slenderness-ratio rotary body; selecting different revolved body water entry parameters as initial conditions for numerical simulation to obtain cavitation bubble evolution processes of different cavitation numbers, obtaining cavitation bubble lengths and maximum cavitation bubble diameters by measuring simulation results, and fitting the cavitation bubble lengths, the cavitation bubble diameters and the cavitation numbers to obtain a relation between cavitation bubble forms and the cavitation numbers; and for the unsteady process of high-speed water entry of the revolving body with the large slenderness ratio, the relationship between the cavitation form and the cavitation number obtained through fitting is used for correcting the steady cavitation model, and an unsteady cavitation evolution model is obtained. According to the invention, the unsteady process of high-speed water entry of the rotary body can be accurately simulated.

Description

technical field [0001] The invention relates to the technical field of underwater vehicles, in particular to a method for constructing a cavitation evolution model of a revolving body with a large length and slenderness ratio entering water. Background technique [0002] The process of projectile entering water can be regarded as a high-speed water entry process of a revolving body with a large length and slenderness ratio. In this process, the high-speed relative motion of projectile and water will reduce the pressure between the two and generate a low-pressure area. When the pressure is lower than the current state When the saturated steam pressure reaches the maximum, the water will vaporize to form a cavity, wrapping the revolving body, separating the revolving body from the water, reducing the resistance it receives, so as to achieve the purpose of increasing the underwater sailing speed. In order to study the law of high-speed water entry of a revolving body with a lar...

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Problems solved by technology

[0003] For the unsteady process of high-speed water entry of a large slenderness rotator, that is, the unsteady process of a moving body with cavitation high-speed water entry, there are existing methods suitable for steady conditions The prediction effect of the cavitation model is poor, and it cannot accurately simulate the unsteady process of the rotating body entering the water at high speed

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