To meet the demand of power grid for flexible regulation, pump turbines have to frequently and fleetly stop, start, transition between different modes, causing many instability problems. solve problems, understanding complex flow pressure pulsation features in working conditions is prerequisite. In this study, patterns, pulsations, cavitation characteristics, runner forces a prototype pump-turb...

The effect of the tip gap size on the performance of a multistage axial compressor was studied by means of computational fluid dynamics (CFD). It was found that the performance of the compressor was very sensitive to the size of the tip gap. By increasing the gap size, the stall margin value, the total pressure ratio and the compressor efficiency reduced considerably. The flow field at the tip ...

A decoupled sliding-mode neural network variable-bound control system (DSMNNVB) is proposed to control rotating stall and surge in jet engine compression systems in presence of disturbance and uncertainty. The control objective is to drive the systemstate to the original equilibriumpoint and it proves that ccepted 7 February 2010 vailable online 11 February 2010 eywords: xial compressors liding...