Measurements of the temperature and velocity field are reported for a specific duct geometry which bends the flow by 90 deg and simultaneously accelerates it to an average exit velocity which is twice the inlet velocity. The measurements demonstrate that the temperature field existing in a cross section upstream of the bend is considerably rearranged by the action of the secondary flow. The temperature field also influences the velocity field as observed in the exit cross section. A simple calculation method which allows a prediction of these effects in the core of the flow field is presented and good agreement to the results of the measurements is found. The importance of this flow rearrangement to various engineering applications, especially to the design of gas turbines, is discussed.

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