In engineering practice, single-phase water hammer models are still employed to analyze the water hammer of solid-liquid flow. According to the characteristics of solid-liquid flow, continuity equations and momentum e...In engineering practice, single-phase water hammer models are still employed to analyze the water hammer of solid-liquid flow. According to the characteristics of solid-liquid flow, continuity equations and momentum equations of pseudo-homogeneous flows are deduced, and a pseudo-homogeneous water hammer model is thus built and verified with experiment results. The characteristics of solid-liquid flow’s viscosity, resistance and wave velocity are considered in the model. Therefore, it has higher precision than a single-phase model.展开更多
The basic equations for computing the volume of gas storage tank were derived from the principles of attenuating water hammer pressure. Verifications using experiments indicate that the proposed equation can provide a...The basic equations for computing the volume of gas storage tank were derived from the principles of attenuating water hammer pressure. Verifications using experiments indicate that the proposed equation can provide a fare precision in the predictions. By using the model of solid liquid two phase flow, the gas storage tank, pressure relief valves and slow closure reverse control valves were compared with practical engineering problems, and the functions of gas storage tank in attenuating water hammer pressure were further investigated. [展开更多
In allusion to easy invalidation of damping valve in vehicle shock absorber caused by the impact from the road surface, the importance of the study of damping valve water hammer pressure is presented. The physical mod...In allusion to easy invalidation of damping valve in vehicle shock absorber caused by the impact from the road surface, the importance of the study of damping valve water hammer pressure is presented. The physical model of damping valve with the circle throttle slice is established. The time for the throttle slice deformation is studied by using the finite software, and the laws that how the structure parameters affect the deformation time are obtained. Combining the theory of water hammer, the water hammer initial and boundary condition of the damping valve is deduced, and the water hammer model of throttle slice is established. The analysis of simulation results indicates that the water hammer pressure amplitude and the amount of water hammer oscillation period can be reduced and the dependability of the valve can be enhanced by modifying the structure parameters and aperture width between slice and valve body.展开更多
针对荥阳市供水工程专项规划中规划京襄城水厂和现状罗垌水厂的供水制约关系,在现状水压分区分压供水的条件下,利用Bentley Water GEMS构建供水系统水力模型,确定选择给水系统的供水方式,优化水厂供水区域,合理划分供水边界,确保规划成...针对荥阳市供水工程专项规划中规划京襄城水厂和现状罗垌水厂的供水制约关系,在现状水压分区分压供水的条件下,利用Bentley Water GEMS构建供水系统水力模型,确定选择给水系统的供水方式,优化水厂供水区域,合理划分供水边界,确保规划成果科学可靠。展开更多
郑州市港区一水厂输水管线首次向市区回供通水,面临输水管线水锤防护及回供水对市区管网产生水力冲击影响的问题。采用Hammer及Bentley Water GEMS软件构建了水锤模型和管网水力模型,对不同输水工况的管道水力瞬变流以及对市政管网的影...郑州市港区一水厂输水管线首次向市区回供通水,面临输水管线水锤防护及回供水对市区管网产生水力冲击影响的问题。采用Hammer及Bentley Water GEMS软件构建了水锤模型和管网水力模型,对不同输水工况的管道水力瞬变流以及对市政管网的影响区域进行了模拟计算分析。通过优选通水方案并有效指导首次回供通水方案,以保证管网安全运行。展开更多
文摘In engineering practice, single-phase water hammer models are still employed to analyze the water hammer of solid-liquid flow. According to the characteristics of solid-liquid flow, continuity equations and momentum equations of pseudo-homogeneous flows are deduced, and a pseudo-homogeneous water hammer model is thus built and verified with experiment results. The characteristics of solid-liquid flow’s viscosity, resistance and wave velocity are considered in the model. Therefore, it has higher precision than a single-phase model.
文摘The basic equations for computing the volume of gas storage tank were derived from the principles of attenuating water hammer pressure. Verifications using experiments indicate that the proposed equation can provide a fare precision in the predictions. By using the model of solid liquid two phase flow, the gas storage tank, pressure relief valves and slow closure reverse control valves were compared with practical engineering problems, and the functions of gas storage tank in attenuating water hammer pressure were further investigated. [
基金Sponsored by the Ministerial Level Advanced Research Foundation (623010202 4)
文摘In allusion to easy invalidation of damping valve in vehicle shock absorber caused by the impact from the road surface, the importance of the study of damping valve water hammer pressure is presented. The physical model of damping valve with the circle throttle slice is established. The time for the throttle slice deformation is studied by using the finite software, and the laws that how the structure parameters affect the deformation time are obtained. Combining the theory of water hammer, the water hammer initial and boundary condition of the damping valve is deduced, and the water hammer model of throttle slice is established. The analysis of simulation results indicates that the water hammer pressure amplitude and the amount of water hammer oscillation period can be reduced and the dependability of the valve can be enhanced by modifying the structure parameters and aperture width between slice and valve body.
文摘郑州市港区一水厂输水管线首次向市区回供通水,面临输水管线水锤防护及回供水对市区管网产生水力冲击影响的问题。采用Hammer及Bentley Water GEMS软件构建了水锤模型和管网水力模型,对不同输水工况的管道水力瞬变流以及对市政管网的影响区域进行了模拟计算分析。通过优选通水方案并有效指导首次回供通水方案,以保证管网安全运行。
