rotating stall at the impeller

  • The Role of Tip Leakage Vortex Breakdown in Flow Fields

    2012-5-3 · As a result the rotating stall cell could not appear in the impeller. In the other compressor impeller the rotating stall cell was formed at stall inception without the vortex breakdown in the tip leakage vortex of full blade and developed with decreased flow rate. Volume Subject Area

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  • An Investigation of Stall Inception in Centrifugal

    2021-7-5 · diffuser rotating stall and impeller . rotating stall (both abrupt and progressive) with. a vaneless . diffuser. Prior to the onset of these fully developed instabilities two . dis. tinct types of stall precursors have been identified long . Proceedings of ASME Turbo Expo 2011 GT2011 June 6-10 2011 Vancouver British Columbia Canada

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  • DYNAMIC DATA ANALYSIS OF COMPRESSOR ROTATING

    2021-5-15 · Jf rotating stall the impeller itself and the diffuser. In many cases the number of stall cells is greater than one .vhich is verified to have negligible reaction forces on the rotor­ Jearing system. However when there is one stall cell per 360 legrees unbalanced loads can

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  • DYNAMIC DATA ANALYSIS OF COMPRESSOR ROTATING

    2021-5-15 · Jf rotating stall the impeller itself and the diffuser. In many cases the number of stall cells is greater than one .vhich is verified to have negligible reaction forces on the rotor­ Jearing system. However when there is one stall cell per 360 legrees unbalanced loads can

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  • Prediction of impeller rotating stall onset using

    2013-5-17 · While stall occurs less often in centrifugal compressors than axial ones it can be much harder to predict. Some preventive measures are known but are mostly rules of thumb developed through experimental experience. This work focuses on the detection of impeller rotating stall

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  • DYNAMIC DATA ANALYSIS OF COMPRESSOR ROTATING

    2021-5-15 · Jf rotating stall the impeller itself and the diffuser. In many cases the number of stall cells is greater than one .vhich is verified to have negligible reaction forces on the rotor­ Jearing system. However when there is one stall cell per 360 legrees unbalanced loads can

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  • Prediction of rotating stall within an impeller of a

    2006-11-14 · Nearly identical stall frequencies were observed in both velocity and pressure power spectra and this rotating stall phenomenon which occurred at a very low frequency relative to the impeller speed did not reveal any noticeable degree of sensitivity to the flow rate.

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  • Prediction of rotating stall within an impeller of a

    2006-11-14 · Nearly identical stall frequencies were observed in both velocity and pressure power spectra and this rotating stall phenomenon which occurred at a very low frequency relative to the impeller speed did not reveal any noticeable degree of sensitivity to the flow rate.

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  • Transient Analysis of Rotating Stall Development in a

    2019-11-5 · The developed diffuser stall cell blocked the impeller exit causing an impeller passage stall. This paper focused on two aspects regarding the transient process of the diffuser stall development. The first aspect is the process by which the vortex at the diffuser throat near the hub side develops in the circumferential direction.

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  • The Role of Tip Leakage Vortex Breakdown in Flow Fields

    2012-5-3 · As a result the rotating stall cell could not appear in the impeller. In the other compressor impeller the rotating stall cell was formed at stall inception without the vortex breakdown in the tip leakage vortex of full blade and developed with decreased flow rate. Volume Subject Area

    Chat Online
  • A Behavior of the Diffuser Rotating Stall in a Low

    Yoshida et al. 3 observed the rotating stall in a vaned diffuser. The propagation speed is under 10 percent of the impeller rotational speed. They studied several types of vaned diffusers and reported that as the clearance between impeller and vaned diffuser was decreased the rotating stall became weakened and the flow range of its

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  • Comparative Rotating Stall and Surge Characteristic of a

    2014-12-24 · Rotating Stall was detected with the vaneless diffuser configuration at the onset of surge. Four stall cells rotated in the same direction as the impeller at 122 Hz. Numerous works have been documented on rotating stall and surge for centrifugal compressors.

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  • Impeller Rotating Stall as a Trigger for the Transition

    2015-2-25 · When the throttle valve was gradually closed at an impeller tip Mach number (Mu) above 0.4 the compressor showed first mild and then deep surge whereas at Mu=0.4 rotating stall was the dominant instability. This single-cell rotating stall was identified to be caused by the impeller.

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  • Rotating Stall Induced Non-Synchronous Blade Vibration

    2019-11-16 · in blade rows and form a transient rotating stall dominated exciting force applying on the entire impeller. In some specific cases the impeller modes may be excited and resonance occurs which is undesirable for blade structure. The unstable operating behavior of rotating stall and induced blade

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  • Experimental Investigation of Surge and Stall in a High

    rotating stall upstream and downstream of the impeller at lower speeds.KangandKang 20 discoveredone-cell two-cell andthree- of impeller outlet at corresponding rotational speed. It is surprising that surge patterns are completely different at different rotational speeds as shown in Fig. 4.

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  • Analysis of rotating stall cells in an impeller of a

    Then the area occupied by stall cells gradually in-creases until almost blocking the inlet section forcing the flow turn to adjacent passage in the rotating di-rection of the impeller which leads to a decreased angle of incidences on the blade.

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  • Investigation of Rotating Stall Phenomenon and

    2020-7-23 · The rotating stall is a kind of flow phenomenon in the impeller harming the navigation speed of vessels propelled by a waterjet propulsion device when the waterjet propulsion device operates at the small flow rate conditions.

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  • Effects of Non-Axisymmetric Volute on Rotating Stall in

    2021-1-11 · The frequency related to rotating stall captured in the experiment is 43.9 of the impeller passing frequency (IPF) while it is 44.7 of IPF captured by three-dimensional unsteady numerical simulation which proves the accuracy of the numerical method in this study.

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  • An Investigation of Stall Inception in Centrifugal

    2021-7-5 · diffuser rotating stall and impeller . rotating stall (both abrupt and progressive) with. a vaneless . diffuser. Prior to the onset of these fully developed instabilities two . dis. tinct types of stall precursors have been identified long . Proceedings of ASME Turbo Expo 2011 GT2011 June 6-10 2011 Vancouver British Columbia Canada

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  • Generation Mechanisms of Rotating Stall and Surge in

    2017-11-23 · Rotating stall is a localized phenomenon restricted to the vicinity of the impeller where stall cells propagate circumferentially across the blade passages. Different rotating stall appearances have been documented 1 4 and control models have been developed .

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  • Effect of Impeller Outlet Flow Affected by Casing

    2018-8-30 · In Impeller-B the casing treatment decreased the pressure fluctuation at the diffuser due to the rotating stall and kept the static pressure rise with a negative slope. The results indicate that improving the outlet flow in cases such as Impeller-B may decrease the shaft oscillations due to rotating stall.

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  • A Behavior of the Diffuser Rotating Stall in a Low

    Yoshida et al. 3 observed the rotating stall in a vaned diffuser. The propagation speed is under 10 percent of the impeller rotational speed. They studied several types of vaned diffusers and reported that as the clearance between impeller and vaned diffuser was decreased the rotating stall became weakened and the flow range of its

    Chat Online
  • Impeller Rotating Stall as a Trigger for the Transition

    2015-2-25 · When the throttle valve was gradually closed at an impeller tip Mach number (Mu) above 0.4 the compressor showed first mild and then deep surge whereas at Mu=0.4 rotating stall was the dominant instability. This single-cell rotating stall was identified to be caused by the impeller.

    Chat Online
  • Generation Mechanisms of Rotating Stall and Surge in

    2017-11-23 · Rotating stall is a localized phenomenon restricted to the vicinity of the impeller where stall cells propagate circumferentially across the blade passages. Different rotating stall appearances have been documented 1 4 and control models have been developed .

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  • Numerical Investigation of Rotating Stall Characteristics

    2020-12-29 · The present paper numerically investigates the rotating stall mechanism in the NASA CC3 transonic centrifugal compressor with wedge-type vaned diffuser. The three-dimensional compressible unsteady Navier–Stokes equations have been applied to a full-annulus high-speed centrifugal compressor comprising an inlet duct impeller and vaned diffuser.

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  • Transient Analysis of Rotating Stall Development in a

    2019-11-5 · The developed diffuser stall cell blocked the impeller exit causing an impeller passage stall. This paper focused on two aspects regarding the transient process of the diffuser stall development. The first aspect is the process by which the vortex at the diffuser throat near the hub side develops in the circumferential direction.

    Chat Online
  • Numerical Investigation of Rotating Stall Characteristics

    2020-12-29 · The present paper numerically investigates the rotating stall mechanism in the NASA CC3 transonic centrifugal compressor with wedge-type vaned diffuser. The three-dimensional compressible unsteady Navier–Stokes equations have been applied to a full-annulus high-speed centrifugal compressor comprising an inlet duct impeller and vaned diffuser.

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  • An Investigation of Stall Inception in Centrifugal

    2021-7-5 · diffuser rotating stall and impeller . rotating stall (both abrupt and progressive) with. a vaneless . diffuser. Prior to the onset of these fully developed instabilities two . dis. tinct types of stall precursors have been identified long . Proceedings of ASME Turbo Expo 2011 GT2011 June 6-10 2011 Vancouver British Columbia Canada

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  • CENTRIFUGAL COMPRESSOR DIFFUSER ROTATING

    2017-12-18 · diffuser rotating stall has been also studied by Benichou et al. (2016) Dodds et al.(2015) Ješe et al.(2015). Having said that CFD appears to be an intersting tool to understand something more about the physics of diffuser rotating stall and to produce useful information about viscous losses and flow

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  • Prediction of impeller rotating stall onset using

    2013-5-17 · Rotating stall is an unsteady flow phenomenon that appears in both axial and centrifugal compressors. It is detrimental to the performance of the compressor significantly narrowing its operating range. Numerical modeling of this phenomenon has been a major area of investigation for axial compressors with some success.

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  • Analysis of rotating stall cells in an impeller of a

    Then the area occupied by stall cells gradually in-creases until almost blocking the inlet section forcing the flow turn to adjacent passage in the rotating di-rection of the impeller which leads to a decreased angle of incidences on the blade.

    Chat Online
  • DYNAMIC DATA ANALYSIS OF COMPRESSOR ROTATING

    2021-5-15 · Jf rotating stall the impeller itself and the diffuser. In many cases the number of stall cells is greater than one .vhich is verified to have negligible reaction forces on the rotor­ Jearing system. However when there is one stall cell per 360 legrees unbalanced loads can

    Chat Online
  • Prediction of impeller rotating stall onset using

    2013-5-17 · While stall occurs less often in centrifugal compressors than axial ones it can be much harder to predict. Some preventive measures are known but are mostly rules of thumb developed through experimental experience. This work focuses on the detection of impeller rotating stall

    Chat Online
  • CENTRIFUGAL COMPRESSOR DIFFUSER ROTATING

    2017-12-18 · diffuser rotating stall has been also studied by Benichou et al. (2016) Dodds et al.(2015) Ješe et al.(2015). Having said that CFD appears to be an intersting tool to understand something more about the physics of diffuser rotating stall and to produce useful information about viscous losses and flow

    Chat Online
  • Generation Mechanisms of Rotating Stall and Surge in

    Generation Mechanisms of Rotating Stall and Surge in Centrifugal Compressors. The tip leakage flow exhibits angular momentum imparted by the impeller which deteriorates the incidence angles at the blade tips through an over imposed swirling component to the incoming flow. We show that the impeller is incapable to maintain constant

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  • Impeller Rotating Stall as a Trigger for the Transition

    2015-2-25 · This single-cell rotating stall was identified to be caused by the impeller. During mild surge at higher Mach numbers the instantaneous flow and pressure traces showed that the overall flow at the stage inlet intermittently dropped below the critical value associated with the occurence of impeller rotating stall.

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  • Rotating Stall in Centrifugal Compressor Vaneless Diffuser

    2019-8-1 · formance and phenomena of instability (stall rotating stall and surge) in the last high-pressure stages. A 2-D impeller (diameter of 300 mm) with free vortex dif-fuser and volute made up the model for the first part of the research. For reproducing the real stage inlet flow conditions a return channel upstream the impeller was also present

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  • Rotating Stall in Centrifugal Compressor Vaneless Diffuser

    2019-8-1 · formance and phenomena of instability (stall rotating stall and surge) in the last high-pressure stages. A 2-D impeller (diameter of 300 mm) with free vortex dif-fuser and volute made up the model for the first part of the research. For reproducing the real stage inlet flow conditions a return channel upstream the impeller was also present

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