In consideration of the problem that the effect of conduit structure on water hammer has been ignored in the classical theory,the Poisson coupling between the fluid and the pipeline was studied and a fourteen-equation...In consideration of the problem that the effect of conduit structure on water hammer has been ignored in the classical theory,the Poisson coupling between the fluid and the pipeline was studied and a fourteen-equation mathematical model of fluid-structure interaction(FSI)was developed.Then,the transfer matrix method(TMM)was used to calculate the modal frequency,modal shape and frequency response.The results were compared with that in experiment to verify the correctness of the TMM and the results show that the fluid-structure coupling has a greater impact on the modal frequencies than the modal shape.Finally,the influence on the response spectrum of different damping ratios was studied and the results show that the natural frequency under different damping ratios has changed little but there is a big difference for the pressure spectrum.With the decreasing of damping ratio,the damping of the system on frequency spectrum is more and more significant and the dispersion and dissipation is more and more apparent.Therefore the appropriate damping ratio should be selected to minimize the effects of the vibration of the FSI.The results provide references for the theory research of FSI in the transient process.展开更多
针对高层建筑给水系统水锤效应防控问题,该研究旨在保障供水安全并优化运维成本。基于特征线法(Method of Characteristics,MOC)与计算流体力学(Computatioinal Fluid Dynamics,CFD)构建多尺度耦合分析模型,创新性提出“源头控制-过程调...针对高层建筑给水系统水锤效应防控问题,该研究旨在保障供水安全并优化运维成本。基于特征线法(Method of Characteristics,MOC)与计算流体力学(Computatioinal Fluid Dynamics,CFD)构建多尺度耦合分析模型,创新性提出“源头控制-过程调压-末端消能”三级协同防护体系。通过工程案例验证表明:系统压力峰值衰减率达64%,压力振荡持续时间缩减45%,符合ASSE1010标准中压力波动控制要求。研究成果为高层建筑给水系统瞬态防护设计提供理论依据与技术方案,促进水锤防护技术向动态调控与智能监测方向发展。展开更多
文摘In consideration of the problem that the effect of conduit structure on water hammer has been ignored in the classical theory,the Poisson coupling between the fluid and the pipeline was studied and a fourteen-equation mathematical model of fluid-structure interaction(FSI)was developed.Then,the transfer matrix method(TMM)was used to calculate the modal frequency,modal shape and frequency response.The results were compared with that in experiment to verify the correctness of the TMM and the results show that the fluid-structure coupling has a greater impact on the modal frequencies than the modal shape.Finally,the influence on the response spectrum of different damping ratios was studied and the results show that the natural frequency under different damping ratios has changed little but there is a big difference for the pressure spectrum.With the decreasing of damping ratio,the damping of the system on frequency spectrum is more and more significant and the dispersion and dissipation is more and more apparent.Therefore the appropriate damping ratio should be selected to minimize the effects of the vibration of the FSI.The results provide references for the theory research of FSI in the transient process.
文摘针对高层建筑给水系统水锤效应防控问题,该研究旨在保障供水安全并优化运维成本。基于特征线法(Method of Characteristics,MOC)与计算流体力学(Computatioinal Fluid Dynamics,CFD)构建多尺度耦合分析模型,创新性提出“源头控制-过程调压-末端消能”三级协同防护体系。通过工程案例验证表明:系统压力峰值衰减率达64%,压力振荡持续时间缩减45%,符合ASSE1010标准中压力波动控制要求。研究成果为高层建筑给水系统瞬态防护设计提供理论依据与技术方案,促进水锤防护技术向动态调控与智能监测方向发展。
