Wall Pressure field downstream of deflectors. Part 1: without aeration

Experiments hare been carried out to determine the characteristics of the r eattaching flow downstream of deflectors placed in a duct with and without aeration. In Part 1 the presentation of experimental results pertaining to the mean velocities and wall pressure is restricted to flows without aerati on. Fluctuations of pressures are presented in terms of their root-mean-squ are values and their probability distributions. The mean pressures presente d will be of interest in the design of aerators. The mean velocities and wa ll pressures are analysed numerically by a discrete vortex model and the co mputed results are compared with the experimental results. It is hoped that information provided in this paper will also be useful in assessing the li kelihood of cavitation in reattaching flows occurring within boundaries of similar geometry. How air injection affects the wall pressure field in the wake of deflectors will be reported separately in Part 2.