Experimental study on hydraulic performance Optimization of pump house with ultra-short forebay

Abstract

The intake channel of circulating water pump house is an important part of water supply system in thermal power plant. The good hydraulic performance of intake channel is very important for operation efficiency of water pump and ensuring the safety of power plant. A hydraulic model of scale 1:12 is used to study the hydraulic characteristics of circulating pump house with an ultra-short forebay in this paper, the reasons for the formation of undesirable flow patterns, such as flow bias at the inlet, rotating filter outlet of the flow channel and backflow the circulation of the pipe at the bottom of the flapper, and the appearance of the suction vortex in the suction chamber, are analyzed, a rectifying facility consisting of "column + beam" is proposed to be installed in the forebay, a curved bias pier is added at the outlet of the traveling network, and a breast wall is suggested to be set in the suction chamber. With undesirable flow patterns in the original scheme are eliminated, the uniformity of the flow velocity distribution in the flow channel is improved, the flow pattern is relatively stable and smooth, and the ideal inflow condition of the suction mouth is guaranteed. The research results can provide a reference for the design and hydraulic performance optimization of the pump house of similar thermal power plant.