半封闭气垫式调压室模型优化与水力特性研究

Study on mathematical model optimization and hydraulic characteristics of semi-closed air cushion surge chamber

为掌握半封闭气垫式调压室的水力特性,通过分析各类调压室共性特征、改进已有模型气体热力学过程的基本假定、统一方程形式和提升离散精度,推导并建立了完全由显式方程组成、易于编程电算、兼适用开敞式与气垫式的半封闭气垫式调压室水力计算数学模型。在此基础上,通过对主要计算参数取值、大波动水力性能、水位波动稳定性能、结构及运行控制开展研究和分析,系统地探讨了半封闭气垫式调压室的水力特性。研究结果表明:该类调压室能自适应运行,性能良好,结构简单,改造方便,兼有开敞式和气垫式调压室的优点。

In order to master the hydraulic characteristics of semi-closed air cushion surge chamber(SACSC),a hydraulic calculation mathematical model of SACSC composed of explicit equations,easy to programming and suitable for both open and air cushion surge chamber,is derived and established by analyzing the common characteristics of all kinds of surge chambers.In the study,we improve the basic assumptions of gas thermodynamic process of existing models,unify the equation form and improve the discrete accuracy.On this basis,through the research and analysis of the main calculation parameters,large fluctuation hydraulic performance,water level fluctuation stability performance,structure and operation control,the hydraulic characteristics of SACSC are systematically discussed.The research shows that SACSC can operate adaptively,has good performance,simple structure and convenient reformation potential,possessing the advantages of open surge chamber and air cushion surge chamber.