超窄联合泵房前池水力性能优化:实例研究

火/核电站的泵房前池作为循环水系统的重要组成部分,关系到电站整体的稳定、安全和高效运行。本文以单进流条件下,纵横比为0.193,且进流平面扩散角达到180°的某核电站超窄联合泵房前池为研究对象,通过多方案多组次的系统模型试验,提出了半圆形扩散墩和悬空隔板相结合的水力性能优化措施,在不大幅改变原设计方案的基础上,消除了原方案前池内水体的大幅紊动、壅高和强回流等不利的水力现象,提高了泵房流道各断面流速分布的均匀性,基本实现了泵房吸水室两侧进水断面的对称进流,同时降低了泵房吸水室内的水面涡强度,使得泵房流道整体的水力性能得到优化。研究成果可为类似火/核电站泵房前池的设计和水力性能优化提供参考。

Hydraulic performance optimization of the ultra narrow union pumping forebay: a case study

As an important part of the circulating water system, the pumping forebay of the thermal and nuclear power plant is related to the stability,safety and efficient operation of the whole system. In this pa-per, the ultra narrow union pumping forebay of a nuclear power plant was taken as the research object. The forebay had an aspect ratio of 0.193-to-one and a single inlet, and the inlet diffusion angle was 180°. Through the systematic experiments with different methods and multiple flow conditions,the hydraulic performance optimization scheme which was consist of the semi-circular diffusion pier and the suspended di-aphragm was proposed. On the basis of not greatly changing the original design scheme, the turbulence of water body,backflow height and strong return area in the pumping forebay were all eliminated,the unifor-mity of flow velocity distribution at the sections of the flow passages was improved, the vortex strength at the water surface in the inlet sump was also reduced. The research results can provide reference for the de-sign and hydraulic performance optimization of pumping forebay of similar thermal and nuclear power plant.