Knowledge and control of the thermo-hydraulic conditions in the reactor is required for the effective accident management. Dedicated and qualified for harsh environment instrumentation has to be in place for this purp...Knowledge and control of the thermo-hydraulic conditions in the reactor is required for the effective accident management. Dedicated and qualified for harsh environment instrumentation has to be in place for this purpose. Experience of the Fukushima Dai-ichi plant and the lessons learned from the European stress tests demonstrated that alternative and divers tools and methods are needed for the identification of reactor condition in extreme situations. In the paper the feasibility of development of an alternative accident monitoring via well-known noise diagnostics methods is proposed and demonstrated. The possibility of identification of reactor accident conditions using temperature and pressure fluctuations, noise of the neutron and gamma field is considered on the basis of research achievements in reactor noise. As an example the use of pressure fluctuations for accident monitoring is presented.展开更多
Waterflood technique with pressure fluctuation, especially with low, ultra low frequency, changes the continuous water flow into the flow with pressure fluctuation, and can prevent contamination precipitation, formati...Waterflood technique with pressure fluctuation, especially with low, ultra low frequency, changes the continuous water flow into the flow with pressure fluctuation, and can prevent contamination precipitation, formation plugging and Jamin effect. It also can prevent the plugging of water injection well, decrease the pressure of waterflood and increase the rate of water injection. On the basis of the existing eccentric injection mandrel, used the energy storage character of air energy accumulator and the pressure switch character of pressure control valve, fixed the plunger valve for pressure control on the position of blanking plug, then developed one new injection mandrel with low frequency character, which can inject water continuously with low, ultra low frequency. Water fluctuation produced during the water injection affect the formation directly and is useful to break down, prevent plugging and augment injection.展开更多
A new view of the spatial relation between fluctuating wall pressure and near-wall streamwise vortices （NWSV） is proposed for wall bounded turbulent flow by use of the direct numerical simulation （DNS） database. T...A new view of the spatial relation between fluctuating wall pressure and near-wall streamwise vortices （NWSV） is proposed for wall bounded turbulent flow by use of the direct numerical simulation （DNS） database. The results show that the wall region with low pressure forms just below the strong NWSV, which is mostly associated with the overhead NWSV. The wall region with high pressure forms downstream of the NWSV, which has a good correspondence with the downwash of the fluids induced by the upstream NWSV. The results provide a significant basis for the detection of NWSV.展开更多
文摘Knowledge and control of the thermo-hydraulic conditions in the reactor is required for the effective accident management. Dedicated and qualified for harsh environment instrumentation has to be in place for this purpose. Experience of the Fukushima Dai-ichi plant and the lessons learned from the European stress tests demonstrated that alternative and divers tools and methods are needed for the identification of reactor condition in extreme situations. In the paper the feasibility of development of an alternative accident monitoring via well-known noise diagnostics methods is proposed and demonstrated. The possibility of identification of reactor accident conditions using temperature and pressure fluctuations, noise of the neutron and gamma field is considered on the basis of research achievements in reactor noise. As an example the use of pressure fluctuations for accident monitoring is presented.
文摘Waterflood technique with pressure fluctuation, especially with low, ultra low frequency, changes the continuous water flow into the flow with pressure fluctuation, and can prevent contamination precipitation, formation plugging and Jamin effect. It also can prevent the plugging of water injection well, decrease the pressure of waterflood and increase the rate of water injection. On the basis of the existing eccentric injection mandrel, used the energy storage character of air energy accumulator and the pressure switch character of pressure control valve, fixed the plunger valve for pressure control on the position of blanking plug, then developed one new injection mandrel with low frequency character, which can inject water continuously with low, ultra low frequency. Water fluctuation produced during the water injection affect the formation directly and is useful to break down, prevent plugging and augment injection.
基金Project supported by the National Natural Science Foundation of China(No.11402088)the Fundamental Research Funds for the Central Universities(No.2014MS33)the State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(No.LAPS15005)
文摘A new view of the spatial relation between fluctuating wall pressure and near-wall streamwise vortices （NWSV） is proposed for wall bounded turbulent flow by use of the direct numerical simulation （DNS） database. The results show that the wall region with low pressure forms just below the strong NWSV, which is mostly associated with the overhead NWSV. The wall region with high pressure forms downstream of the NWSV, which has a good correspondence with the downwash of the fluids induced by the upstream NWSV. The results provide a significant basis for the detection of NWSV.
