Rotating stalls are one of the most dangerous phenomena to be avoided in designing and operating axial flow compressors. An understanding evolution characteristics around rotor tip region is important study process stall development. In this paper, some critical stall-related structures, which could not observed by traditional analysis methods, understood using proper orthogonal decomposition (...

Unsteady pressure-pulsation-induced severe vibration and high alternating stress can cause some unexpected results, including impeller crack structural damage of the entire pumping system. In present paper, a review on pressure pulsations in pumps is carried out based published studies. A comprehensive view from several aspects discussed detail. The contents studies include mechanism rotor–stat...

An unsteady two-dimensional finite-volume solver was developed based on Van Leer’s flux splitting algorithm in conjunction with “Monotonic Upstream Scheme for Conservation Laws (MUSCL)” limiters to improve the order of accuracy and the two-layer Baldwin-Lomax turbulence model was also implemented. Two test cases were prepared to validate the solver. The computed results were compared with the e...

Numerical simulations were performed to investigate pressure fluctuations in the S-shaped region of a pump-turbine model. Analyses focused on pressure fluctuations in the draft tube and in the gap between the guide vanes and runner. Calculations were made under six different operating conditions with a constant guide vane opening, and the best efficiency point, runaway point, and low-discharge ...

The onset of rotating stall and surge in compressors limits the operating range aero-engines. Accurately predicting key features during these events is critical engine design process. In this paper, a three-dimensional computational model for transient simulation multi-stage axial proposed. kinetic equations describing dynamic process compression system are constructed, with 3D through-flow par...