深水水库隔水幕布透水率对下泄水温影响研究

Effects of temperature-control curtain permeability on discharge water temperature in deep reservoirs

隔水幕布作为分层取水设施可有效缓解由深水水库温度分层导致的低温水下泄影响。为探究幕布材料透水率对下泄水温及幕布总体受力的影响,依据一深水水库实测水文水温资料,建立并验证了该水库的三维水动力水温数值模拟模型,对比分析了不同工况下的流场、温度场及幕布总体受力结果。研究结果表明:随着幕布材料透水率增至7%,下泄水温逐渐降低,较未采用幕布时下泄水温提升幅度由2.31℃降至0.33℃。随着材料透水,幕布总体受力减小,不透水幕布所受总水平推力为1242 t,满足下泄水温需求的透水率为2%的幕布所受总力为293t。在工程应用中应根据水温提升需求,综合考虑幕布受力及经济性等因素选用幕布材料,对于该工程幕布材料平均透水率不应超过2%。

Temperature-control curtain(TCC)is an effective selective withdrawal facility to alleviate adverse effects of thermal stratification in deep reservoirs leading to low temperature water discharging.Based on the measured data of a certain deep reservoir,a three-dimensional hydrodynamic and temperature simulation model was established and calibrated to explore the effect of material permeability factor on water temperature increasement and overall stress performance.The characteristics of flow field,temperature field and overall stress of TCC were analyzed by setting several conditions of water temperature distributions.The simulation results showed that when the material permeability of the curtain increased to 7%,the discharge water temperature gradually decreased.The effect of water temperature enhancement comparing with no TCC condition was reduced from 2.31℃to 0.33℃.As the material was permeable to water,the overall stress of the impervious curtain was 1242 t.For the 2%water permeability curtain that met the demand for the discharge water temperature,the overall stress was 293 t.To select appropriate curtain materials,the requirement of water temperature,the mechanical characteristics and economic factors should be taken into comprehensive consideration in real application.It is suggested that the average permeability of curtain material should not exceed 2%in this project.