Results 251 to 260 of about 24,380 (286)

Stall inception in a transonic axial fan

Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 2008
The current paper reports a numerical investigation of stall inception in a transonic compressor rotor, NASA Rotor-67, by using the whole flow passages in the computations. Surface roughness is added to one of the blades in order to trigger rotating stall.
H Khaleghi, M Boroomand, A M Tousi, J A Teixeira   +3 more
openaire   +1 more source

Flow Models in Boundary-Layer Stall Inception

Journal of Basic Engineering, 1961
Physical evidence on stall inception from visual studies, mean-velocity-profile correlations, shear measurements, and fluctuations in separating boundary layers in the neighborhood of stall are discussed. Direct visual studies suggest that stall inception in the laminar boundary layer follows the classical model, but does not necessarily do so in the ...
V. A. Sandborn, S. J. Kline
openaire   +1 more source

Spike type of stall inception in the tandem rotor

Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2022
There are two known mechanisms of inception of rotating stall in the compressor, modal wave inception and spike inception. However, the stall inception mechanisms for a tandem-rotor have not been explored so far in detail. The paper explores the unsteady behaviour of the tandem rotor. Unsteady casing pressure measurements are carried out with the help
Amit Kumar, Akshay Kumar, A. M. Pradeep
openaire   +1 more source

Stall Inception Measurements in a High-Speed Multistage Compressor

Journal of Turbomachinery, 1995
This paper presents unsteady measurements taken in a high-speed four-stage aeroengine compressor prior to the onset of aerodynamic flow instabilities. In this experiment, 40 fast-response pressure transducers have been located at various axial and circumferential positions throughout the machine in order to give a very detailed picture of stall ...
J. F. Escuret, V. Garnier
openaire   +1 more source

Pre-Stall Waves: Precursors to Stall Inception in a Contra-Rotating Axial Fan

Volume 2E: Turbomachinery, 2020
Abstract Stall in a compressor or a fan is often associated with pre-stall waves, that could act as precursors. The present study aims to understand in detail the pre-stall waves leading to instabilities in a low aspect ratio, low hub-tip ratio contra-rotating axial fan.
Manas Madasseri Payyappalli, A. M. Pradeep   +1 more
openaire   +1 more source

Stall inception and control in a transonic fan, part A: Rotating stall inception

Aerospace Science and Technology, 2015
Abstract Half-annulus numerical simulations of rotating stall inception have been carried out on a transonic axial compressor rotor. In order to initiate stall, the tip gap of one of the blades in the half-annulus computational domain was increased, and computations were conducted from choke to near-stall and in-stall conditions.
openaire   +1 more source

Stall Inception in a High-Speed Centrifugal Compressor

Volume 1: Aircraft Engine; Marine; Turbomachinery; Microturbines and Small Turbomachinery, 2001
Stall inception in a high-speed centrifugal compressor has been examined. The main objective was to find stall precursor and to develop a reliable stall warning method. Eight equally spaced fast-response pressure transducers in the inducer detected the spatial structure of small amplitude perturbations, via spatial Fourier transform, as stall is ...
Jeong-Seek Kang, Shin-Hyoung Kang
openaire   +1 more source

Spike-Type Compressor Stall Inception, Detection, and Control

Annual Review of Fluid Mechanics, 2010
An aerodynamic instability known as stall occurs in axial compressors as the mass flow rate is reduced and the blade loading reaches its limit. At this limiting condition, an easily recognizable flow breakdown process, known as spike-type stall inception, is observed in most modern compressors.
C.S. Tan, I. Day, S. Morris, A. Wadia
openaire   +1 more source

Stall Inception in Axial Flow Compressors

Journal of Turbomachinery, 1991
Studies have been conducted on two laboratory test compressors to investigate the process leading to the formation of finite amplitude rotating stall cells. The measurements were obtained from circumferential arrays of hot wires and were spatially and temporarily analyzed to show that modal perturbations are not always present prior to stall, and when ...
openaire   +1 more source

Review of Stall Inception in Turbocompressors

Journal of Fluid Machinery, 2003
Stall inception means the phenomena of rotating stall initiation. The initiation mechanism of rotating stall, the existence of stall precursor, the behavior of stall precursor, stall warning scheme and control scheme are the main interests in stall inception research. Compared to the studies on rotating stall which has long history, the stall inception
openaire   +1 more source