Experimental Study on Flow Separation in a Two-Dimensional Channel with a Throat.

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Abstract
An experimental and analytical investigation on flow separation in a two-dimensional closed channel has been carried out. In the experiment, one of the channel walls was moved by indentation from the outside to make a variable throat. The separated boundary layer was observed using flow visualization, and the pressures along the flow direction were measured using five pressure transducers. In the analysis, governing equations were formulated using a one-dimensional flow theory, taking into account the pressure loss due to flow separation. Comparison between the results of the experiment and the analysis shows that analytical and experimental values for the pressure loss due to flow separation agree only in a flow region where the flow is characterized by a parallel-sided jet. Observations on the flow separation and reattachment by flow visualization suggest the necessity of improvement for the one-dimensional flow theory used in order to predict the separation characteristic more accurately.

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