In order to explore the cause of the flow pattern problem in the forebay of the pumping station at the diversion operating condition in Taihuzhuangyuan in Changzhou City, and find the corresponding solution, the three-dimensional turbulent numerical simulation method was used to calculate the inlet flow pattern after the prototype of the lock station and the addition of the diversion pier. By analyzing the flow uniformity and weighted average angle of the inlet section in each case, it can be concluded that the flow pattern of the forepbay is mainly caused by the large diffusion angle. The longer a single diversion pier is added to the forebay, the better the rectification effect will be. Compared with the single pier, the combined pier can weaken the recirculation region more and improve the inlet flow pattern. The research results can provide reference for engineering practice.

forebay  /  large diffusion angle  /  flow pattern  /  diversion pier  /  numerical simulation