高压降多级降压疏水阀流体激振与内部非定常流动机理研究

Aiming at the current situation of the high temperature and high depressurization traps lacking of basic theory research, the problems in the work process are analyzed, which are flow-induced vibration, high noise and water hammer damage in valve-opening process. The mathematical model of coupled nonlinear vibration in valve-opening process and turbulent flow- induced vibration in drainage process on valve controlled pipeline system were built. The internal unsteady flow characteristics and the flow-induced nonlinear vibration characteristics of pipeline system were revealed. The influence of opening law, flow characteristics, structural parameters of the sleeve about trap on the unsteady flow and vibration in valve controlled pipeline system are emphatically researched, the structure parameters of multi-stage depressurization trap is optimized. The presented models are verified and corrected by numerical simulation and experiment analysis methods. Thus, the better theory foundation of valve design is laid and a method for high parameter valve design theory is provided, which would promote its reliability and stability.

针对高温高压降疏水阀缺乏基础理论研究的现状，研究其工作过程中存在的流体诱发管系振动、高噪声及开启瞬间水击破坏等问题。建立开启瞬间水击非线性振动模型与排水过程中阀控管路系统湍流流体激振模型，揭示疏水阀内部非定常流动特性及管路系统流体诱发非线性振动特性。分析疏水阀不同开启规律、不同流量调节特性及套筒结构参数对阀控管路系统非定常流动和振动特性的影响，优化多级降压疏水阀结构参数，结合模拟分析与实验研究加以验证并修正模型，为该类阀门设计基础理论的完善奠定基础，为高参数阀门设计理论提供方法借鉴，促进其可靠性、稳定性的提高。

本项目针对高温高压降疏水阀等阀门在其工作过程中存在的流体诱发管系振动、高噪声及开启瞬间水击破坏等问题展开研究。基于非恒定流充液管道流固耦合理论，以高温高压降疏水阀等阀门为研究对象，通过理论分析、数值模拟和实验研究等方法，考虑边界约束条件，建立了开启瞬间水击非线性振动模型与排水过程中阀控管路系统湍流流体激振模型，揭示了疏水阀等阀门内部非定常流动特性及管路系统流体诱发非线性振动特性，分析了疏水阀等阀门不同开启规律、不同流量调节特性及套筒结构参数对阀控管路系统非定常流动和振动特性的影响规律。结合数值分析和实验研究加以验证并修正模型，为该类阀门设计基础理论的完善奠定基础，也为高参数阀门设计提供理论方法借鉴，保障高压降阀门及阀控管道系统的可靠性、稳定性提高。通过本项目的研究共发表了学术论文11篇，其中EI/SCI期刊检索论文7篇，中文核心期刊论文4篇，授权发明专利2项，培养了硕士研究生6名，培养了青年教师2名。