水下回转体首部边界层流动稳定性及自然转捩研究进展综述

Review of flow stability and natural transition of boundary layers onunderwater axisymmetric bodies

水下回转体首部边界层自然转捩是重要的流动现象,与水下航行体的流动噪声密切相关。流动稳定性理论是研究边界层转捩的重要方法。本文首先介绍了水下回转体首部边界层流动稳定性研究的4个发展阶段;其次介绍了自然转捩的预测方法,包括经验和半经验两类;然后介绍了转捩位置控制常用方法,包括改变首部线型、使用超疏水材料、控制壁面温度和在表面加入抽吸;最后基于当前的研究进展,对水下回转体首部边界层转捩研究提出了建议。

The laminar–turbulent transition in the bow boundary layers on underwateraxisymmetric bodies is an important phenomenon in various flows,and has important influenceon the flow noise.The flow stability theory is an important approach to study boundary layertransition.The four stages of the research progress on flow stability of the boundary layers onunderwater axisymmetric bodies are introduced.Furthermore,the prediction methods of naturaltransition are introduced,including the empirical method and the semi-empirical method.Thecommon methods to control the transition location are introduced,including changing theforebody shape,applying superhydrophobic coating,heating/cooling the wall,and blow/suctionon the wall.Finally,based on the current research status,some suggestions are provided for theresearch of the transition in boundary layers on underwater axisymmetric bodies.