Stall Inception in Low-Pressure Ratio Fans

Roll Stall for Low-Aspect-Ratio Wings

The longitudinal aerodynamics of micro aerial vehicles, although not fully understood, have been the subject of several studies in recent years; however, littleworkhasbeendone to investigate the lateral loading. In this experiment, flat-plate wings with rectangular planforms of aspect ratios AR 0.75, 1, 1.5, and 3 and tapered planforms of λ 0.75, 0.5, and 0.25 were placed in the wind tunnel at ...

Local Nonlinear Control of Stall Inception in Axial Flow Compressors

A combination of theoretical and computational nonlinear analysis techniques are used to study the scenario of bifurcations responsible for the initiation of rotating stall in an axial ow compressor model. It is found that viscosity tends to damp higher-frequency modes and so results in a sequence of bifurcations along the uniform-ow solution branch to stall cells of diierent mode number. Lower...

Passive mitigation of roll stall for low aspect ratio wings

Passive mitigation of roll stall for low aspect ratio wings Matt Shields a & Kamran Mohseni b a Department of Mechanical & Aerospace Engineering, University of Florida, 32611-6250, Gainesville, FL, USA b Mechanical & Aerospace Engineering Department and Electrical & Computer Engineering Department, Institute for Networked Autonomous Systems, University of Florida, 32611-6250, Gainesville, USA V...

Active control of compressor stall inception: a bifurcation-theoretic approach

Fluid Dynamics Characteristics during Stall Inception Process in a Centrifugal Fan

Based on the three-dimensional elliptic governing equations and the throttle model, an unsteady numerical simulation of rotating stall is undertaken in the case of G4-73 type centrifugal fan and the correctness of simulation results is verified by experiments. In this study a new rotating stall inception criterion is put forward, that the inlet flow or outlet back pressure fluctuations graduall...