抽水蓄能电站蜗壳保压值优化研究  

Study on Optimizing Precast Water Head of Spiral Case at Pumped-storage Power Plant

作　　者：聂金育[1] 伍鹤皋[1] 苏凯[1] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《水电能源科学》2009年第1期151-154,共4页Water Resources and Power

摘　　要：针对白莲河抽水蓄能电站充水保压蜗壳的不同保压值,对蜗壳应力、外围混凝土应力、座环位移、混凝土承载比进行了对比分析,并通过计算蜗壳与外围混凝土间初始缝隙值判断运行时两者接触情况,分别对蜗壳紧贴和脱开混凝土两种情况进行了动力分析。计算结果表明,保压值越大对蜗壳和混凝土的受力越有利,但保压值过大,运行时蜗壳与混凝土可能脱离、结构自振频率与机组固有频率接近、易产生共振,对机组稳定不利;当保压值为165 m时,蜗壳与混凝土的应力合理,且不易共振,供借鉴。Based on the spiral case keeping constant internal pressure at a pumped-storage power plant, the stresses and bearing ratio of the surrounding concrete of the volute, the stresses of the volute and the displacements of the stay . ring have been compared in different pre-cast water head of spiral case. By calculating the initial gap between the volute and the surrounding concrete, the contact state of the volute and the concrete in the operation can be judged. The dynamic analysis and the comparison have been done under two conditions when the volute clings to or disengages the concrete. Some conclusions can obtained got from the result that the stress states of the surrounding concrete and the spiral case get better with the pre-cast water head increasing. However, when the water head is too high, the volute would disengage the concrete when generating unit runs. And the structural frequency is close to natural frequency which may result in reso- nance and is not beneficial to the stability of the unit. When the precast water head is 165m, the distribution of stresses of spiral case and concrete is uniform and reasonable and it is unease to resonate. So the 165m water head is recommended to preserve pressure during construction.

关 键 词：抽水蓄能电站 充水保压蜗壳 优化 ANSYS 共振 

分 类 号：TV731[水利工程—水利水电工程] TV314