NDLI: Parametric Study for Lossless Casing Treatment on a Mixed-Flow Compressor Rotor

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Djeghri, Noureddine Vo, Huu Duc Yu, Hong
Copyright Year	2015
Abstract	A systematic numerical study has been carried out to investigate the effects of casing treatment slots geometry and location on the stall margin and peak efficiency of an isolated mixed-flow rotor at high subsonic flow conditions. Based on the literature review for axial rotor, a semi-circular axial skewed slot casing treatment placed in the leading edge region was chosen as the starting configuration as it has the best potential of producing stall margin improvement with low peak efficiency loss. A computational parametric study was performed from this baseline casing treatment geometry to identify the most important geometrical design parameters and to arrive at a design with noticeable stall margin improvement and no loss in peak efficiency. The results show that the design parameters with the largest impact on stall margin improvement and peak efficiency are: open area ratio, slot skew angle, slot axial length and slot axial position. The slots depth and slot shape seem to have only limited influence on performance. While not yet optimized, a slot casing treatment design with significant stall margin improvement and no loss in peak efficiency was obtained. To the authors’ knowledge, this work is the most extensive slot casing treatments parametric study so far in term of number of design parameters considered.
Sponsorship	International Gas Turbine Institute
File Format	PDF
ISBN	9780791856635
DOI	10.1115/GT2015-42750
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	Design Geometry Rotors Subsonic flow Compressors Shapes Flow (dynamics)
Content Type	Text
Resource Type	Article

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