Song, Charles C. S.Yuan, MingshunWang, QunHe, Jianming2011-08-302011-08-301989-06https://hdl.handle.net/11299/114137A 1:14 scale model of the Large Oavitation Ohannel (LOO) was built and tested by Voith Hydro, Inc. [l]. The velocity profiles on the central plane of symmetry was surveyed using Pitot tubes at stations P1 to P7 as shown in Fig. 1. Later, additional measurements were made with LVD at stations Ll to L4 [2]. These measurements indicated the existence of unusually thick boundary layers on the top wall at the test section and poor flow quality in the diffuser when the honeycomb for turbulence management was present. Some improvements on mean velocity profiles were found possible by either completely or partially removing the honeycomb.en-USReport