Journal ArticleDOI
Rotating Instabilities in an Axial Compressor Originating From the Fluctuating Blade Tip Vortex
TLDR
In this article, the rotational instability (RI) is observed in axial flow fans, centrifugal compressors as well as in low-speed and high-speed axial compressors.Abstract:
Rotating instabilities (RI) have been observed in axial flow fans, centrifugal compressors as well as in low-speed and high-speed axial compressors. They are responsible for the excitation of high amplitude rotor blade vibrations and noise generation. This flow phenomenon moves relative to the rotor blades and causes periodic vortex separations at the blade tips and an axial reversed flow through the tip clearance of the rotor blades.The paper describes experimental investigations of RI in the Dresden Low-Speed Research Compressor (LSRC). The objective is to show that the fluctuation of the blade tip vortex is responsible for the origination of this flow phenomenon.RI have been found at operating points near the stability limit of the compressor with relatively large tip clearance of the rotor blades. The application of time-resolving sensors in both fixed and rotating frame of reference enables a detailed description of the circumferential structure and the spatial development of this unsteady flow phenomenon, which is limited to the blade tip region.Laser-Doppler-Anemometry (LDA) within the rotor blade passages and within the tip clearance as well as unsteady pressure measurements on the rotor blades show the structure of the blade tip vortex.It will be shown that the periodical interaction of the blade tip vortex of one blade with the flow at the adjacent blade is responsible for the generation of a rotating structure with high mode orders, termed as rotating instability (RI).Copyright © 2000 by ASMEread more
Citations
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Journal ArticleDOI
Effects of Tip Clearance on Stall Inception in a Multistage Compressor
TL;DR: Rotor tip clearance height and the associated tip leakage flow have a significant effect on the performance and stability of compressors as mentioned in this paper, and existing studies considering tip clearance effects on stabler stability are limited.
Journal ArticleDOI
Circumferential propagating characteristics of tip leakage flow oscillation and its induced rotating pressure wave
TL;DR: In this article, the tip leakage flow oscillation and its circumferential propagation features are investigated numerically on a low-speed axial compressor rotor with full-annulus unsteady simulations.
Turbomachine Sealing and Secondary Flows
TL;DR: In the case of the Space Shuttle main engine high pressure fuel turbopump (SSME HPFTP) as discussed by the authors, the data of Childs and Bently and field data reported in NASA Conference Proceedings serve as sources of design information for the development of these computational codes.
Dissertation
Design for Coupled-Mode Flutter and Non-Synchronous Vibration in Turbomachinery
TL;DR: In this paper, a design for Coupled-Mode Flutter and Non-Synchronous Vibration in Turbomachinery is presented. But the design is based on the same model as in this paper.
Proceedings ArticleDOI
Flow Visualization Using Cavitation Within Blade Passage of an Axial Waterjet Pump Rotor
TL;DR: In this article, a high-speed imaging of an axial waterjet pump, AxWJ-2, operating at and below the best efficiency point (BEP), is presented.
References
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Proceedings ArticleDOI
A Study of Spike and Modal Stall Phenomena in a Low-Speed Axial Compressor
T. R. Camp,I. J. Day +1 more
TL;DR: In this article, a study of stall inception mechanisms in low-speed axial compressors is presented, where the authors show that the stability criteria for the two disturbances are different: long lengthscale disturbances are related to a two-dimensional instability of the whole compression system, while short length-scale disturbances indicate a three-dimensional breakdown of the flow field associated with high rotor incidence angles.
Journal ArticleDOI
1997 Best Paper Award—Turbomachinery Committee: A Study of Spike and Modal Stall Phenomena in a Low-Speed Axial Compressor
T. R. Camp,I. J. Day +1 more
TL;DR: In this article, a study of stall inception mechanisms in a low-speed axial compressor is presented, where the authors show that the stability criteria for the two disturbances are different: long length scale disturbances are related to a two-dimensional instability of the whole compression system, while short length-scale disturbances indicate a three-dimensional breakdown of the flow-field associated with high rotor incidence angles.
Journal ArticleDOI
Structure of Tip Clearance Flow in an Isolated Axial Compressor Rotor
Masahiro Inoue,Motoo Kuroumaru +1 more
TL;DR: In this paper, aperiodic multisampling technique with a hot wire in the clearance and with a high-response pressure sensor on the casing wall was used to obtain ensemble-averaged and phase-locked flow patterns in various tip clearances of two axial compressor rotors.
Journal ArticleDOI
Experimental study of tip clearance losses and noise in axial turbomachines and their reduction
F. Kameier,Wolfgang Neise +1 more
TL;DR: In this article, the negative effects of the tip clearance gap on the aerodynamic and acoustic performance of axial turbomachines were investigated and a turbulence generator was used to eliminate the noise and improve aerodynamic performance.
Proceedings ArticleDOI
Role of Blade Passage Flow Structures in Axial Compressor Rotating Stall Inception
TL;DR: In this paper, the influence of three-dimensional flow structures within a compressor blade passage has been examined computationally to determine their role in rotating stall inception, and it was concluded that the flow structure within the blade passages must be addressed to explain the stability of an axial compression system which exhibits such short length-scale disturbances.