Radial inflow turbines are the preferred architecture for energy extraction from the organic Rankine cycle and the supercritical CO2 Brayton cycle at smaller scales. For such turbines it is possible for fluid to be delivered to the first stage by either a volute or plenum delivery system. For high pressure supercritical CO2 turbines, there are no fully documented fluid delivery systems in liter...

The detailed unsteady turbulent flow inside a centrifugal fan and its downstream pipe was studied using detached eddy simulation (DES) at three flowrates, namely, the best efficiency point (BEP), 0.75BEP, 1.49BEP. Both mean fluctuating fields were analyzed on basis of root-mean-square value as indication intensity. Results showed that pressure fluctuation had minimum BEP, but velocity increased...

The flow in centrifugal pumps is exceedingly complex, involving curvature, system rotation, separation, turbulence, and secondary flows. Moreover, the geometry is often asymmetric due to the volute shape. As a result, the relative motion between impeller and volute generates an unstableness which affects not only the overall pump performance, but is also responsible for pressure fluctuations, h...

background: since the earliest days of medicine, the tongue has been considered a good reflection of systemic disease. hip­pocrates, galen and others considered the tongue to be barometer of health. in addition, the early diagnose of tongue le­sions help to recognize the some systemic diseases. the purpose of this study was to determine the frequency of different mor­phological variations (anom...

An experiment in forced vibration was conducted to study the fluidinduced rotordynamic force on an impeller whirling along a trajectory eccentric to its undeflected position. The prescribed whi l trajectory of the rotor is a circular orbit of a b e d radius. The force measured is a combination of a steady radial force due to volute asymmetries and an unsteady force due to the eccentric motion o...

Abstract In this work, three actual impeller geometries of identical size, with backward, radial, and forward flow passages in the same volute casing, are experimentally analysed numerically simulated to understand physics characteristics performance mapping under different flowrate conditions. A grid independence test is carried out for whole computational domain capture complex behaviour insi...

The wide use of pumps and turbines has significant value in energy conservation utilization. In this work, a three-dimensional Computational Fluid Dynamics (CFD) model one-dimensional theoretical Pump as Turbine (PAT) were established. On basis, the correlation between pressure velocity was quantitatively investigated by proposed sensitivity index (SPV). A synergy field analysis then applied to...

Centrifugal pumps are an integral part of plants used in process industries. The flow structure within a centrifugal pump is very complex due to the interaction between the rotating impeller and the geometric features around it. In the present study, numerical investigations on a centrifugal pump have been carried out using a Computational Fluid Dynamics (CFD) based solver. This study employs f...

Turbulent flow, mainly originating from the rotor-stator interaction (RSI), is closely associated with normal and safe operation of centrifugal pump. In current research, to clarify turbulent flow in pump a vaned diffuser, non-intrusive LDA (Laser Doppler Anemometry) system applied measure velocity pulsation signals at different regions when operates various rates. Time frequency domain analysi...