Design And Flow Noise Analysis Of A Flow Adaptive Valve Used For Drainage From Cabin In Deep-sea

As all the countries pay more and more attention to the ocean development, all kinds of submersible vehicles have been developed and put into use to explore the deep-sea. For the submersible vehicle, the drainage system is crucial. Submersible vehicles take the way of high pressure blowing-out to drain off the water from the cabin. If the blowing-out pressure is exorbitant,it will cause violent pressure pulsation and generate high noise,which can do harm to the concealment of submersible vehicles.Based on the summary and analysis of current researching achievements of high-pressure-blowing and flow-dynamic-regulation valves,a new type of flow adaptive valve has been created in the article. It has been design with the structure that can provide driving force to itself, and take the feedback mechanism of pressure difference. It regards the environment pressure as signs to compare with, which is different from valves existed that take springs as the way of providing pressure compensation. The valve can make the pressure at the outlet change with the environment pressure,and keep a constant relationship. It can adapt to the environment very well. So it can be used in the blowing-out system on submersible vehicles, which can help to make the blowing-out process more smoothly and reduce the noise. That will do good to the concealment of submersible vehicles,and be a promotion to the smooth in floating up process.These following work has been finished in the article:The general scheme has been presented after analyzing the design requirements. The structure with the function of opening and closing, pressure feedback, viscous damping,dealing with emergency, and sealing has been designed in detail. The three-dimensional model has been made.Some calculation about the key parts has been made, including friction on the sealing pairs, the specific pressure on the sealing surface. The formula used to calculate viscous damping force is derived. Some simulation in regard to the intensity and deformation of the valve body, fastenings is carried out with ANSYS Workbench.According to the computational fluid dynamics theory, the information of flow field in the flow adaptive valve has been got by means of Fluent. By imagining to put the valve into use in the blowing-out system in one submersible vehicle, the geometric model and calculation model is built. The work related to simulating the process of blowing water out with 20 Mpa high-pressure gas compared with the blowing-out process in which the valve work, has been finished. The calculation results show that the valve can make blowing-out process more smoothly, and it can keep the pressure at outlet in the range that is expected. By analyzing the velocity field and flow path, the conclusion has been got, in which way the air flowing in the valve.Based on the Lighthill acoustic analogy theory, the information how the flow noise distributes in the space has been attained through using the Acoustic module of Fluent. From the comparing the difference in the time domain and frequency domain results between high-pressure blowing-out and blowing-out by the valve, the conclusion comes out that the blowing-out process can be more smooth and with less noise under help of the valve. The calculation result proves that the valve designed in the present paper is able to play an important role in blowing-out system to make it with a better performance.The flow adaptive valve has been finished through the work stated above. And it can achieve the desired goals.