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 Large-Eddy Simulation of the tip leakage flow a single airfoil is carried out. The configuration consists non-rotating, isolated between two horizontal plates with gap 10 mm and lower plate. Mach number incoming 0.2, Reynolds based on chord 9.3 × 105. objective present study to investigate best way compute both aerodynamics acoustics flow. In particular, importance inflow conditions predictio...

Large-eddy simulation is performed to study the turbulence statistics and flow structures of water past a rotating axial-flow pump under different flow-rate working conditions. A novel sharp-interface level-set based immersed boundary method applied capture complex geometry pump. An unstructured triangular mesh used discretize surface pump, ray-tracing employed classify computational domain int...

Recent experiments conducted in the Rotor Force Test Facility at the California Institute of Technology have examined the effects of a tip leakage restriction and swirl brakes on the rotordynamic forces due to leakage flows on arl impeller undergoing a prescribed circular whirl. The experiments simulate the leakage flow conditions and geometry of the Alternate Turbopump Design (ATE)) of the Spa...

Tip clearance has a great effect on the flow and pressure fluctuation characteristics in multiphase pump, especially at multiple operating points. The phase distribution tip pump are revealed using CFD (computational fluid dynamics) technology high-speed photography methods. In this paper, distribution, gas-liquid two-phase velocity slip, intensity comprehensively analyzed. Results show with in...