Abstract
The Institute of Jet Propulsion of the University of the German Federal Armed Forces Munich performs extensive experimental and numerical investigations with a linear cascade representing a profile of a variable inlet guide vane (VIGV) of a radial compressor. The VIGV is used to control the operating point of the compressor by setting the swirl of the inflow. For this reason the stagger angle can be varied between 0◦ and more than 90◦. The investigations presented within this work handle with an assessment of the profile loading and loss at a set of different Reynolds numbers and Mach numbers as well as for varied stagger angles. Considering the Reynolds number as function of the chord length it is shown that the outlet flow of a VIGV is not constant along the blade height for βS 6= 90◦. Part I of the paper shows the experimental investigation of an VIGV and in part II the numerical results are discussed.
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