Journal ArticleDOI
Investigations of rotating instability and fluctuating tip clearance flow in a low-speed axial compressor:
Hao Wang,Yadong Wu,Hua Ouyang,Jie Tian,Zhaohui Du +4 more
- Vol. 230, Iss: 6, pp 981-994
Reads0
Chats0
TLDR
In this article, the authors investigated the relationship between rotating instability and fluctuating tip clearance flow and found that tip clearance vortex structures oscillate periodically at low flow rate conditions, which leads to an intense fluctuation of the casing flow field.Abstract:
To investigate the relationship between rotating instability and fluctuating tip clearance flow, experimental tests as well as numerical studies are conducted on a 1.5 stage low-speed axial compressor rig. The rotating instability is detected through casing mounted dynamic pressure sensors. The phase-locked and root-mean-square pressure contours show that the interaction of tip clearance flow with the neighboring blade is the most likely cause of casing flow field fluctuation. From the calculated results of entire-annulus cascade, it is found that the tip clearance vortex structures oscillate periodically at low flow rate conditions. That leads to intense fluctuation of the casing flow field. Further, phase lag of pressure fluctuations exists between two neighboring passages, which induces a rotating pressure pattern of multiple frequencies. The frequency characteristics of this rotating pressure pattern caused by fluctuating tip clearance flow is coincident with the frequency of rotating instability. Thi...read more
Citations
More filters
Journal ArticleDOI
Experimental study on rotating instability mode characteristics of axial compressor tip flow
TL;DR: In this paper, a calibration and prediction method to capture the higher circumferential mode of unsteady flow in axial compressors was proposed, and the rotor instability frequency (RIF) spectrum with a broadband hump was observed in a large range of flow conditions.
Journal ArticleDOI
Tip leakage flow, tip aerodynamic loading and rotating instability in a subsonic high-speed axial flow compressor rotor
TL;DR: In this paper, a subsonic axial flow compressor rotor was used to enhance the understanding of the flow mechanism of rotational instability in rotational stall in the compressor by using dynamic pressure measurements and full-annular URANS simulations, and it was shown that RI characterized by a frequency hump in the spectrum appears near stall condition.
Experimental Study of Tip Clearance Losses and Noise in Axial Turbomachines
F. Kameier,Wolfgang Neise +1 more
TL;DR: In this paper, 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.
Journal ArticleDOI
Azimuthal Mode Characteristics of Rotating Instability in Axial Compressor Using Compressed Sensing Method
TL;DR: In this article, a signal reconstruction algorithm based on the compressed sensing (CS) theory with dual-uniform sampling point (DUSP) distribution is developed and applied to identify the azimuthal mode of axial compressor.
Journal ArticleDOI
Nonaxisymmetric Study of Tip Leakage Flow in a Centrifugal Compressor With a Volute During Stall Process
Abstract:
Tip leakage flow (TLF) patterns, which affect compressor performance, are closely related to compressor stability. To date, minimal attention has been given to circumferential nonuniformity of the TLF in a centrifugal compressor with a nonaxisymmetric volute structure. In this study, the circumferential difference of the TLF in a centrifugal compressor with a volute during the stall process is analyzed. The circumferential nonuniformity of tip leakage vortex (TLV) trajectories, loading distribution near the tip, and distance between the TLV core and the leading edge (LE) of splitter blades were also investigated. It is shown that in the circumferential direction, there are two peaks associated with the angle (α) between the TLV trajectory of the seven main blades and the axial direction. As the stall process progresses, the blade whose LE is affected by the high static pressure band (PP) induced by the volute tongue (VT) loses its work capacity first and the α difference between this blade and the other blades increases. In addition, the tip loading and TLF velocity of the blade whose LE is affected by the high static pressure band induced by the VT are at a minimum, and the flow loss in the tip clearance is higher. There is a phenomenon of the TLV breakdown. When the blade trailing edge (TE) is located in the low static pressure region, TLV streamlines appear as a significant turn at the breakdown point. However, the TLV streamlines at other circumferential positions do not exhibit this phenomenon.
References
More filters
Journal ArticleDOI
Rotating Instabilities in an Axial Compressor Originating From the Fluctuating Blade Tip Vortex
TL;DR: 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.
Journal ArticleDOI
An Experimental and Numerical Investigation Into the Mechanisms of Rotating Instability
TL;DR: In this article, an experimental and numerical investigation aimed at understanding the mechanisms of rotating instabilities in a low speed axial flow compressor was carried out with high-resolution pressure measurements at different clearances.
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.
Journal ArticleDOI
Rotating blade flow instability as a source of noise in axial turbomachines
F. Kameier,Wolfgang Neise +1 more
TL;DR: In this article, the authors investigate the aeroacoustic generation mechanism of the tip clearance noise in axial turbomachines and show that the noise is associated with a rotating source or vortex mechanism which moves relative to the blade row at a fraction of the impeller shaft speed, similar to the cell(s of rotating stall.
Related Papers (5)
Rotating blade flow instability as a source of noise in axial turbomachines
F. Kameier,Wolfgang Neise +1 more