Results 21 to 30 of about 229 (213)
Simulation of Entropy Generation under Stall Conditions in a Centrifugal Fan
Entropy, 2014 Rotating stalls are generally the first instability met in turbomachinery, before surges. This 3D phenomenon is characterized by one or more stalled flow cells which rotate at a fraction of the impeller speed. The goal of the present work is to shed some
Lei Zhang +3 more
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Stall Inception in a Boundary Layer Ingesting Fan [PDF]
Volume 2A: Turbomachinery, 2015 Jet engines with Boundary Layer Ingestion (BLI) could offer significant reductions in aircraft fuel burn compared with podded turbofans. However, the engine fans must run continuously with severe inlet distortion, which is known to reduce stability. In this paper an experimental study has been completed on a low-speed rig fan operating with a BLI-type ...
Perovic, D, Hall, CA, Gunn, EJ
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Energies, 2021 In this paper, an experimental study was carried out on the rotating instability in an axial compressor subjected to inlet steady paired swirl distortion.
Rong Xu +4 more
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Using Tip Injection to Stability Enhancement of a Transonic Centrifugal Impeller with Inlet Distortion [PDF]
Journal of Applied Fluid Mechanics, 2022 This paper aims to understand the effects of circumferential inlet distortion and tip injection on a transonic impeller performance and flow field. For distorted inflow, the impeller is subjected to a stationary 120-degrees circumferential total pressure
Z. Jahani, H. Khaleghi, S. Tabejamaat
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Numerical Study on the Acoustic Characteristics of an Axial Fan under Rotating Stall Condition
Energies, 2017 Axial fan is an important piece of equipment in the thermal power plant that provides enough air for combustion of coal. This paper focuses on the aerodynamic noise characteristics of an axial fan in the development from stall inception to stall cells ...
Lei Zhang +4 more
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Experimental Examination of an Axial Compressor as a Basis for an Active Stall Avoidance System
International Journal of Rotating Machinery, 2000 A single-stage subsonic compressor was examined with respect to compressor instabilities. During the inception of rotating stall, the transients of the pressure rise and mass flow were measured as well as their hysteresis.
Richard Schulze +3 more
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Advances in Mechanical Engineering, 2019 Rotating stall is a common instability phenomenon that occurs in turbomachinery. Rotating stall 3D instability can be characterized as one or more stall cells rotating at a fraction of rotor velocity.
Lei Zhang +3 more
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An Investigation of Stall Inception in Centrifugal Compressor Vaned Diffusers [PDF]
Volume 7: Turbomachinery, Parts A, B, and C, 2011 In compression systems the stable operating range is limited by rotating stall and/or surge. Two distinct types of stall precursors can be observed prior to full scale instability: the development of long-wavelength modal waves or a short-wavelength, three-dimensional flow breakdown (so-called “spike” stall inception).
Everitt, Jonathan Neil +1 more
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Machines, 2022 Focusing on the identification of dynamic system stability, a hybrid neural network model is proposed in this research for the rotating stall phenomenon in an axial compressor.
Mingming Zhang +4 more
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Energies, 2021 Numerical simulations have been performed to study the effect of the circumferential single-grooved casing treatment (CT) at multiple locations on the tip-flow stability and the corresponding control mechanism at three tip-clearance-size (TCS) schemes in
Xiaoxiong Wu +3 more
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