This paper presents the interaction between blade vibration and part-span rotating stall in a multi-stage high speed compressor. Unsteady aerodynamic aeroelastic simulations were conducted using URANS CFD. Steady state computations showed short length scale disturbances formed local to tip of front stage rotor. Using full annulus model, these shown coalesce into flow structures around at approx...

We start from the dynamic equations of the comprimating systems (Greitzer-1976) and we make a nondimensionalizing the mass flow rate, the pressure and the time to obtain the nondimensional governing equations. To analyse the stability we apply the Routh Hourwitz criterion and we determin the useful stability range for compressor stability. We propose an interesting concept of dynamic stabilizat...

A computational study of compressor instability based on body force representation of each blade-row of a transonic stage has been implemented for both clean inlet flow and flow with circumferential total pressure inlet distortion. The computational results indicate that many aspects related to compressor instability differ from what was observed in the experiment: steady compressor characteris...

Centrifugal pumps are required to sustain a stable operation of the system they support under all operating conditions. Minor modifications of the surfaces defining the pump’s water passage can influence the tendency to unstable system operation significantly. The action of such modifications on the flow are yet not fully understood, leading to costly trial and error approaches in the solution ...

Abstract This paper describes the active control of the instabilities of an axial flow compressor using a fuzzy logic controller. The controller is designed using a genetic algorithm. The control variable is the throttle of the outlet valve, situated after the compressor. Simulation results show that the controller is able to control both the surge and the rotating stall in the critical operati...