NDLI: Effects of Vortex Generator Jet on Flow Separations in Bowed Compressor Cascades

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Li, Longting Song, Yanping Chen, Fu Liu, Huaping
Copyright Year	2015
Abstract	A combined flow control was performed by using a vortex generator jet (VGJ) in bowed compressor cascades. Loss calculations were done over a wide range of parameters including jet mass flow, jet direction and jet location, to determine their effectiveness in controlling flow separation. The topology theory is introduced in this paper to analyze the changes of separation structures in bowed cascades caused by VGJ. The results in this paper indicate that not all kinds of VGJs made up of jet parameters in any arrangement can improve the flow conditions of bowed cascades, but that there are optimal combinations of jet parameters attaining the largest total pressure loss reduction of up to 2.7% and 9.1% for positively and negatively bowed blades, respectively. The VGJ comprised of optimal jet parameters make the flow separation on the suction side of the positively bowed blade basically disappear. The VGJ in the optimal case renders flow separation on the suction side of the negatively bowed blade be relieved so that a separation line on it disappears accordingly. In addition, the mechanisms of VGJs in cases which increase the loss in bowed cascades were chosen to be analyzed in detail. The consequences show that VGJ, in that case, causes that two passage vortices are produced in the positively bowed blade, so the flow field is deteriorated. For the negatively bowed blade, the VGJ leads to the result that the flow separation on the suction side is severer and the separation nodal point corresponding to the corner vortex is transformed from a degenerately nodal point to a spiral point which means that the loss caused by the corner vortex increases.
Sponsorship	International Gas Turbine Institute
File Format	PDF
ISBN	9780791856635
DOI	10.1115/GT2015-42308
Volume Number	Volume 2A: Turbomachinery
Conference Proceedings	ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
Language	English
Publisher Date	2015-06-15
Publisher Place	Montreal, Quebec, Canada
Access Restriction	Subscribed
Subject Keyword	Suction Blades Flow separation Vortices Flow control Compressors Generators Topology Separation (technology) Flow (dynamics) Corners (structural elements) Pressure
Content Type	Text
Resource Type	Article

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