Abstract: A method of using split hot film is presented in the measurement of two dimensional Abstract A method of using split hot film is opresented in the measurement of two dimensinoal unsteady turbulence flows.Two noval data reduction algorithms were proposed and their merits and accuracies over existing algorithms were also presented.The method was successfully applied to the measurement of the complex turbulence separating flow in a quasi-two dimensional diffuser and it was shown that the split hot film is one of the powerful tools for the study ofcomplex turbulence flows with separation and reversal flow.

Key words: split-Flm, separation flow, turbulent measurement