On the basis of experimental results the new design of a Variable\r\nInlet Guide Vane (VIGV), as can be used for the control and\r\nregulation in multishaft compressors, is presented. Main goal of\r\nthis investigation is a significant increase of the operating range\r\nand a reduction of the total pressure loss compared to a currently\r\nused basic design. For both designs 2D-cascades were build for\r\ndetailed measurements in the High-Speed Cascade Wind Tunnel\r\nat the Institute of Jet Propulsion at the Universit¨at der Bundeswehr\r\nM¨unchen. The basic design exhibits a symmetric profile\r\nwith only one segment. In contrast to that the new VIGV\r\ndesign consists of two symmetric vane segments which are arranged\r\npivotable to each other. This provides the advantage of\r\na symmetric profile for a fully opened VIGV associated with a\r\nlow-loss level. For guidance of the flow, both vane segments can\r\nbe rotated. Hence, the turning of the flow is split onto two segments.\r\nThis avoids a huge flow separation on the suction side for\r\nhigh turning angles (Db > 30) which is linked with a strong and\r\nabrupt loss increase. Due to the design, the new VIGV exhibits\r\na gap between the two vane segments. Results with opened and\r\nsealed gap are presented and discussed. Using a sealing between\r\nthe segments, a reduction of the profile loss could be detected for\r\nall investigated operating conditions. Even without a sealing in\r\nthe gap, the ”low-loss working range” is significantly increased.\r\nIn addition, it is depicted that the presented results are valid for\r\nvarying inflow velocities. This broadens the usability of the outcomes.\r\nConcluding, it is shown that all aims are achieved. Using the new VIGV design with sealing the low-loss working range\r\ncan almost be doubled (Db > 55) and the total pressure loss decreases\r\nin every working condition compared to the basic design    «

On the basis of experimental results the new design of a Variable\r\nInlet Guide Vane (VIGV), as can be used for the control and\r\nregulation in multishaft compressors, is presented. Main goal of\r\nthis investigation is a significant increase of the operating range\r\nand a reduction of the total pressure loss compared to a currently\r\nused basic design. For both designs 2D-cascades were build for\r\ndetailed measurements in the High-Speed Cascade Wind Tunnel\r\nat the Institute of Jet Propul...    »