本项目针对现代液压技术高功率重量比集成化模块化的应用与发展导致液压阀内显著的剪切流动波涡耦合流体自激振荡现象，以及由此带来的液压阀刺耳啸叫、共振破坏、作动紊乱、意外开启等严重问题，基于从微观流动模型机理到振荡流场控制方法再到振荡流场环境液压阀基础设计准则的认知过程与研究方法，着眼于受限空间与相变介质复杂环境漩涡演进与波动反馈机理，非自由边界可压缩粘性流动自激振荡数学模型与解析方法，自激振荡流场控制方法与振荡流场环境液压阀基础设计准则等共性基础科学问题的研究与解决。基础理论相对缺乏是制约我国液压基础件及整机装备快速发展的关键原因之一，导致长期依赖进口并受国外制约的不利局面，此项研究旨在突破传统液压阀稳态流体传动与静态参数设计的认知和理论局限，建立满足当前应用与未来发展需求的液压阀技术与理论。

As hydraulic technology develops towards the directions of high power-to-weight ratio, integration and modularization, remarkable shear flow self-excited oscillation occurs in hydraulic valves, which bring serious problems, like whistling flow noise, structure resonance failure, valve control disorder and unexpectedly notch opening, etc. Follow the research route, from basic research of oscillation flow mechanism, to effective flow control method, and finally to the design principles of hydraulic valves in self-excited oscillating flow conditions, three basic issues would be investigated and resolved in this research, which are vortex evolution and fluctuation feedback mechanism in two phase flow with limited space, mathematic modeling and its analytic method of compressible flow self-excited oscillation in non-free field, oscillating flow control method and hydraulic valve design principles in self-excited oscillating flow conditions. The relative deficiency of fundamental thesis is one of the key reasons of hydraulic technology less development in our country, which leads the adverse situation of excessive dependence on import from abroad. The present research is aiming at breaking-through the bottleneck of traditional theory, to build a new more practical one for present use and further development.