Control and Entropy Analysis of Tip Leakage Flow for Compressor Cascade under Different Clearance Sizes with Endwall Suction

Tip Leakage Flow Downstream of a Compressor Cascade with Moving End Wall

Energy Performance and Flow Patterns of a Mixed- Flow Pump with Different Tip Clearance Sizes

Tip clearance between blade end and shroud is inevitable in pump operation and of great importance on pump energy performance and pressure fluctuation. As the tip clearance size increases, the head and efficiency of the mixed flow pump drop accordingly. The simulation results show that the development of a leakage vortex is observed as the tip clearance increases, and the trajectory of this lea...

Effects of Different Turbulence Models in Simulation of Unsteady Tip Leakage Flow in Axial Compressor Rotor Blades Row

Characteristics of rotor blade tip clearance flow in axial compressors can significantly affect their performance and stable operation. It may also increase blade vibrations and cause detrimental noises. Therefore, this paper is contributed to investigate tip leakage flow in a low speed isolated axial compressor rotor blades row. Simulations are carried out on near-stall condition, which is val...

Aspects of Two-Phase Flow Screw Compressor Modelling Part I: Leakage Flow and Rotor Tip Friction

A one-dimensional leakage flow model for two-phase ammonia-water twin screw compressors is presented. The model takes into account viscous and acceleration forces and is based on three conservation equations and on the equation of state for homogenous NHiH20 mixture. The governing equations are solved with a finite difference method. Numerical shooting is used to find such inlet flow velocity a...

The CFD Analysis of a Screw Compressor Suction Flow

Dynamic flow losses in the suction chamber are a significant factor in reducing screw compressor efficiency but can only be roughly estimated in compressor design due to the simplified methods of analysis used to account for them. Today, Computational Fluid Mechanics analysis may be used to estimate velocity, pressure, temperature and concentration fields within a screw compressor far more accu...