平板喷气减阻模型试验的气层形态及其近似预报模型研究  

Study on Prediction Model of Ventilation at the Bottom of the Plate

作　　者：吴浩[1,2] 贺佳乐[1,2] WU Hao;HE Jia-le(Key Laboratory of High Performance Ship Technology(Wuhan University of Technology),Ministry of Education,Wuhan 430063,China;School of Naval Architecture,Ocean and Energy Power Engineering,Wuhan University of Technology,Wuhan 430063,China)

机构地区：[1]高性能船舶技术教育部重点实验室(武汉理工大学),武汉430063 [2]武汉理工大学船海与能源动力工程学院,武汉430063

出　　处：《武汉理工大学学报》2023年第4期63-71,共9页Journal of Wuhan University of Technology

基　　金：内河航运技术湖北省重点实验室基金(NHHY2020005);国家自然科学基金(52101368).

摘　　要：为研究平板底部的气层流动形态及其影响因素,在循环水槽中开展了针对平板底部气液两相流边界层特性的气层减阻模型试验。作者采用扩散角、厚度及含气率等参数对气层的宏观特征进行了描述,提出了气层形态的近似预报方法,以及关于减阻率的估算公式。结果表明:气流量和来流速度对气层形态影响较大。气流量增加会导致气层的扩散角、厚度及含气率增大,来流速度增加致使气层的扩散角、厚度及含气率降低;近似预报方法对气层扩散边界预报的精度达9%,可较好地总结出气流量及来流速度对气层宏观形态的影响规律,该方法可助力于气泡船喷气减阻可行性分析及母型船的选择。In order to study the flow patterns and influencing factors of the gas layer at the bottom of a flat plate,a model test for drag reduction of the gas layer was carried out in a circulating flume aiming at the characteristics of the gasliquid two-phase flow boundary layer at the bottom of a flat plate.In this paper,the macroscopic characteristics of the gas layer are described by using the parameters of diffusion Angle,thickness and gas holdup,and the approximate prediction method of the gas layer shape is presented,as well as the estimation formula of drag reduction rate.The results show that the gas flow rate and incoming flow velocity have great influence on the gas formation.The increase of gas flow will lead to the increase of gas diffusion Angle,thickness and gas holdup,and the increase of flow velocity will lead to the decrease of gas diffusion Angle,thickness and gas holdup.The accuracy of the approximate prediction method for the boundary of the gas layer diffusion is up to 9%,which can better summarize the influence law of the air outlet flow and incoming flow velocity on the macroscopic shape of the gas layer.The method can help the feasibility analysis of drag reduction of the bubble ship and the selection of the mother ship.

关 键 词：气层形态 近似预报模型 扩散角 含气率 

分 类 号：U661.1[交通运输工程—船舶及航道工程]