NDLI: A Method for Evaluating the Aerodynamic Stability of Multi-Stage Axial-Flow Compressors

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Nakano, Tsuguji Breeze-Stringfellow, Andy
Copyright Year	2009
Abstract	A new simple engineering parameter to evaluate the stability of multi-stage axial compressors has been derived. It is based on the stability analysis for a small circumferential disturbance imposed on the steady state flow field. The analytical model assumes that the flow field is two dimensional and incompressible in the ducts between blade rows although the steady state density is permitted to change across the blade rows. The resulting stall parameter contains terms that relate to the slope of the pressure rise characteristic of the blade rows and the inertia effects of the fluid in the blade rows and ducts. The parameter leads to the classical stability criteria based on the slope of the overall total to static pressure rise coefficient in the limit where constant density and constant blade rotational speed are assumed across the compressor. The proposed stall parameter has been calculated for three different multi-stage axial flow compressors and the results indicate that the parameter has a strong correlation with the measured stability of the compressors. The good correlation with the test data demonstrates that the newly derived stall parameter captures much of the fundamental physics of instability inception in multi-stage compressors, and that it can be a good guideline for designers and engineers needing to evaluate the stability boundary of multi-stage machines.
Sponsorship	International Gas Turbine Institute
Starting Page	323
Ending Page	334
Page Count	12
File Format	PDF
ISBN	9780791848883
DOI	10.1115/GT2009-60220
e-ISBN	9780791838495
Volume Number	Volume 7: Turbomachinery, Parts A and B
Conference Proceedings	ASME Turbo Expo 2009: Power for Land, Sea, and Air
Language	English
Publisher Date	2009-06-08
Publisher Place	Orlando, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Stability Inertia (mechanics) Blades Ducts Compressors Density Flow (dynamics) Pressure Steady state Machinery Physics Fluids Engineers Axial flow
Content Type	Text
Resource Type	Article

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