A two-phase hydraulic turbine’s performance and flow field were predicted under different Inlet Gas Volume Fractions (IGVF) with incompressible compressible models, respectively. The calculation equation of equivalent head, efficiency, loss considering the expanding work gas deduced based on energy conservation equations. Then, results, including output power fields, are compared analyzed. mode...

In this study, the unique reverse-flow around inlet nozzle of a squirrel-cage fan was numerically studied by computational fluid dynamics (CFD), and non-axisymmetric D-type proposed to inhibit it. It is shown that serious back flow develops at volute tongue when operates low coefficient lower than best efficiency point. The airflow passing blade passages in reverse further crosses impeller, mix...

An air compressor is the core component of supply system a hydrogen fuel cell, which demands high efficiency and reliable stability in wide operation region. In this work, centrifugal for cell first designed then measured experimentally. Furthermore, test rig assessing aerodynamic performance established, includes pipeline, gas flowmeter, flow regulating valve, pressure transmitter, compressor,...

Along with the developments of high-speed and highperformance turbomachines, there has been increasing occurrence of rotational speeds higher than the first critical speed. Under these circumstances, turbomachines may suffer from severe vibration and rotor whirl caused by fluid-dynamic forces. As possible causes of whirling instabilities, fluid forces on journal bearings and seals are well know...

By means of setting inlet pre-rotator ,the inlet and exit flow field of the diagonal flow impeller with exit guide volute have been measured with 5 holes probe, in different flow conditions, and in the conditions of positive and negative pre-rotating. The expe1iment results are compared with that of without the pre-rotator.

Stall usually occurs in the hump area of head curve, which will block channel and aggravate pump vibration. For centrifugal pumps with guide vanes have a clocking effect, stall characteristic at different positions should be focused. In this paper, flow field under conditions is numerically simulated, rotor–stator interaction effects are studied. The double-hump found curve by using SAS (Scale ...

This paper presents a comparative based analysis on the mechanical behavior of three different forms volute centrifugal pump with spline, radial and tangential type using ABAQUS Software calculation code. The result shows that stress concentration is localized at nozzle for all types forms. founding an interesting element as regards to possibilities adaptation particular operation. Also it foun...