Results 231 to 240 of about 38,124 (276)
Some of the next articles are maybe not open access.
Predicting stall and post-stall behavior of airfoils at low Mach numbers
AIAA Journal, 1995An interactive boundary-layer method, together with the e"approach to the calculation of transition, is used to predict the stall and post-stall behavior of airfoils in incompressible and compressible flows at low freestream Mach numbers. Two separate inviscid methods—a panel method with compressibility corrections and a full potential method—are used ...
Tuncer Cebeci +3 more
openaire +1 more source
Stall Inception Behavior in a Centrifugal Compressor
Volume 1: Turbomachinery, 1994In studying the stall inception process, while most results were reported for axial compressors, the present paper investigates the stall inception behavior typified in a centrifugal compressor. The test was conducted with a radially-bladed impeller and in a speed range of 8000–14000 rpm.
J. Chen +3 more
openaire +1 more source
Dynamic stall behavior from unsteady force measurements
Journal of Fluids and Structures, 2008Abstract A direct force measurement technique employing piezoelectric load cells is used to experimentally investigate a two-dimensional airfoil (NACA 0012) undergoing dynamic stall. The load cells are installed at each end of the airfoil and give the force response in two directions in the plane normal to the airfoil axis during oscillations ...
K.K.Y. Tsang +3 more
openaire +1 more source
Flight determination of configurational effects on aircraft stall behavior
21st Atmospheric Flight Mechanics Conference, 1996The objective of this paper is to investigate the influence of changes in aircraft's configuration, such as those caused by a deflected flap or a landing gear, on its stall characteristics. To this end, stall model in statespace is extended to account for asymmetric unsteady effects and applied to quasisteady and dynamic stall maneuvers for different ...
Singh, J., Jategaonkar, R.V.
openaire +2 more sources
Behavior of Dairy Cattle in Free Stall Housing
Transactions of the ASAE, 1984ABSTRACT TIME lapse photography was used to record the behavior of ten lactating dairy cows housed together during cold weather in a free stall barn. Frames of movie film were exposed at 2-min intervals for three periods of five days each. Location and activity data were recorded for each cow, and computer analyzed for frequency and duration.
null Louis D. Albright +1 more
openaire +1 more source
Techniques for Tailoring Aircraft Stall and Post-Stall Behavior
SAE Technical Paper Series, 1993<div class="htmlview paragraph">This paper briefly reviews existing experimental and analytical techniques applied extensively to military configurations operating in stalled flight. As a consequence of these efforts, the fighter flight envelope has been expanded well beyond wing stall without encountering departures from controlled flight.< ...
openaire +1 more source
Post Stall Propeller Behavior at Low Reynolds Numbers
46th AIAA Aerospace Sciences Meeting and Exhibit, 2008Limited data exists for propeller and wind turbine post stall aerodynamics. Post stall aerodynamics was observed in small propellers at low Reynolds numbers. First, performance data (thrust, power, and efficiency) for a set variable pitch propellers was acquired in a wind tunnel. The propellers were 6 to 9.9 inches in diameter and were able to pitch to
Daniel Uhlig, Michael Selig
openaire +1 more source
Prediction of stall and post-stall behavior of airfoils at low and high Reynolds numbers
11th Applied Aerodynamics Conference, 1993An interactive boundary-layer method, together with the e(super n)-approach to the calculation of transition, has been used to predict the stall and post-stall behavior of airfoils at low and high Reynolds numbers. The turbulence model is based on the Cebeci-Smith algebraic eddy-viscosity formulation with improvements for strong pressure gradient ...
T. CEBECI, F. ROKNALDIN, L. CARR
openaire +1 more source
The Unsteady Pre-Stall Behavior of the Spike-Type Rotating Stall Within an Airfoil Vaned-Diffuser
Volume 2A: Turbomachinery, 2018The spike-type rotating stall (RS) inception inside the vaned-diffuser, which seriously restricts the performance range and brings the problems of blade fatigue, still seems to be a ‘mystery’ since its randomness. The paper intends to explain the mechanisms of this stall inception.
Jiayi Zhao +3 more
openaire +1 more source
Effects of Farrowing Stall Layout on Piglet Productivity and Behavior
Iowa State University Animal Industry Report, 2022This large-scale field study evaluated the effects farrowing stall environment on piglet productivity and behavior. Three farrowing stall layouts were tested (T – traditional, C – expanded creep area, S – expanded sow area) in conjunction with one or two heat lamps (1HL or 2HL).
Hongwei Xin +5 more
openaire +1 more source