Water hammer pressure transient produces large dynamic forces which can damage the pipes and other assemblies in the feed line of a reaction control system(RCS).It has led to the failure of pressure transducers monito...Water hammer pressure transient produces large dynamic forces which can damage the pipes and other assemblies in the feed line of a reaction control system(RCS).It has led to the failure of pressure transducers monitoring the manifold pressure in the feed line of RCS.Therefore,water hammer studies have been carried out to understand its effect in feed line.Feedline system has been simplified to develop a mathematical model and experiments have been carried out at extensive levels.The mathematical model was developed considering pipe of uniform c/s and moving liquid-gas interface.The experimental studies have been done using water as working medium instead of actual propellant.The studies showed that rate of pressurization have a very critical role on the water hammer amplitude.Sensitivity studies have been also carried out to study the effect of density,friction and initial liquid column length on water hammer amplitude.展开更多
The hydraulic and sediment deposition problems in the water intake system of a pumping house were studied by physical model. The experimental results of different working cases indicate that the sediment depositions a...The hydraulic and sediment deposition problems in the water intake system of a pumping house were studied by physical model. The experimental results of different working cases indicate that the sediment depositions at the gates, stilling basin and culverts are very few when the system was normally operated, but in the forebay of pumping house, especially in the pumping house for living water, the amount of sediment deposition sometimes is considerably large. At the front of the entry of pumping house for living water, installing a set of oblique pipes can prevent the coarse grains to enter it, the deposition amount will obviously decrease.展开更多
文摘Water hammer pressure transient produces large dynamic forces which can damage the pipes and other assemblies in the feed line of a reaction control system(RCS).It has led to the failure of pressure transducers monitoring the manifold pressure in the feed line of RCS.Therefore,water hammer studies have been carried out to understand its effect in feed line.Feedline system has been simplified to develop a mathematical model and experiments have been carried out at extensive levels.The mathematical model was developed considering pipe of uniform c/s and moving liquid-gas interface.The experimental studies have been done using water as working medium instead of actual propellant.The studies showed that rate of pressurization have a very critical role on the water hammer amplitude.Sensitivity studies have been also carried out to study the effect of density,friction and initial liquid column length on water hammer amplitude.
文摘The hydraulic and sediment deposition problems in the water intake system of a pumping house were studied by physical model. The experimental results of different working cases indicate that the sediment depositions at the gates, stilling basin and culverts are very few when the system was normally operated, but in the forebay of pumping house, especially in the pumping house for living water, the amount of sediment deposition sometimes is considerably large. At the front of the entry of pumping house for living water, installing a set of oblique pipes can prevent the coarse grains to enter it, the deposition amount will obviously decrease.
