Analysis of Structure and Cryogenic Control of Large Full Ocean Deep Environment Simulator
The deep-sea environment simulation device plays a critical role in the development of deep-sea technology and equipment.Prestressed steel wire winding technology transforms the traditional single-layer cylinder into a double-layer structure and provides a cooling channel between the inner and outer cylinders.In this study,based on the preliminary calculations and analysis of the cylinder structure and the cryogenic control process,an experimental cylinder with diameter of 1 000 mm and a depth of 2 500 mm,capable of withstanding pressure of up to 200 MPa,is designed for simulating deep-sea ultra-pressure environment.According to the calculation results:In the design of cylinder structure,when the preload coefficient(η)of prestressed winding wires,outer radius(ro)of the cylinder,and the total thickness of the core cylinder are determined to be 1.13,795 mm and 177 mm,respectively.Then,the required thickness of the winding steel wire layer is 118 mm;During the cryogenic control process,when the isentropic efficiency of booster pump is 0.6,it is necessary to cool the working medium water in the initial state to 0 ℃ by the refrigerating system,and keep the ice content in the cylinder no less than 4.6％,the total cooling capacity of the refrigeration system is not less than 24.62 kW.Therefore,the experimental cylinder can simulate deep-sea environment for an extended period at 200 MPa and 4 ℃.The research results can provide a reference for the study of cryogenic control strategy of large full ocean deep environment simulator.
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