Quasi-static and dynamic stall control experiments, using dielectric barrier discharge plasma actuators, were performed on a square-tipped aspect-ratio-one wing, with NACA 0015 profile, under harmonic pitching, at Reynolds number of . Relatively low relatively high pulse-modulated reduced excitation frequencies introduced the leading edge; former produced largest poststall lift improvements, wh...

In this paper we investigate the behavior of higher order Galerkin expansions of the Moore-Greitzer model of general transients in aeroengine compression systems. We assume steady state en-trainment of the higher Fourier modes of the rotating stall cell which establishes a framework for a simpli-ed numerical analysis of the bifurcating solutions corresponding to rotating stall. For small values...

The current study was carried out to determine the influence of different resting surfaces and stall types on milk yield and animal health. Study was carried out in Bursa that is one of the most important cities of Turkey in terms of dairy production. Effects of resting surfaces and stall types on milk yield were found to be important. Also influence of different resting surfaces and stall type...

Microprocessors commonly encounter data hazards that must be resolved by stalling the pipeline until all inputs become available. The stall is broadcast globally to previous stages so no tokens are lost. As propagation delays of cross-chip wires exceed 1 cycle, it is no longer possible to stop the processor “on a dime.” Local Stall Propagation is a systematic approach to solving the problem. In...

This work couples a computational fluid dynamics (CFD) code and rotorcraft computational structural dynamics (CSD) code to calculate helicopter rotor airloads across a range of flight conditions. An iterative loose (weak) coupling methodology is used to couple the CFD and CSD codes on a per revolution, periodic basis. The CFD uses a high fidelity, Navier-Stokes, overset grid methodology with fi...

Plus BROWSE SEARCH IEEE XPLORE GUIDE SUPPORT View TOC Rotating stall control for axial flow compressors Belta, C. Guoxiang Gu Sparks, A. Banda, S. Dept. of Electr. & Comput. Eng., Louisiana State Univ., Baton Rouge, LA; This paper appears in: Decision and Control, 1998. Proceedings of the 37th IEEE Conference on Publication Date: 1998 Volume: 3, On page(s): 2557-2562 vol.3 Meeting Date: 12/16/1...

A numerical technique capable of simulating blade-scale compression system ow instabilities over times scales spanning tens of rotor revolutions is presented. Simulations of stall inception, growth to fully-developed rotating stall, and evidence for hysteresis, secondary instabilities, and other nonlinear phenomena are presented. Signal processing techniques for ow asymmetry characterization ar...

Control and Modeling for stall and surge phenomenon in axial flow compressors have received great importance in recent times. In power generation plant and aerospace propulsion compression system are prone to the aerodynamic instabilities of stall and surge. In aero engine compressors higher pressure ratio has always been a growing stipulates which has over involved by diverse rotating stall an...