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In order to research on the water filling and emptying process of a pressured-pipeline in long distance, according to the characteristics for the pressured-pipeline in the long distance during the filling and emptying process, the strategies of sectional treatment and water filling and emptying in succession were adopted. For each segment of the pipe, a mathematical model was established with using...
The 3-D turbulent flow in 90 ° bend pipe of circular section of hydroelectric power station diversion road was simulated numerically by realizable k-e turbulence model with FLUENT. According to the analysis on internal flow field and distribution of elbow flow-field, we drew the best measuring section and provided a theoretical basis for measurement of bend flow.
A large drainage pumping station by lateral oblique water way, which installed five shaft tubular pump, with single pump design flow 34m3 / s. The numerical simulated and hydraulic optimization is worked by using three-dimensional simulation software CFD on pumping station pool rectifier. Analysis results from numerical simulation: within a certain hydraulic losses range, the retaining water weir's...
The contact problem of single-row four point contact ball type slewing bearing, which is exposed to bearing radial load and axial load, was analyzed with Hertz theory. Then VC program of the slewing bearing was given according to calculation formula of contact stress, contact angle and deformation. Taking hydraulic excavators as example, the contact stress and contact angle were calculated in different...
We propose a universal field-oriented (UFO) control schemes for the rotor-side controller of doubly-fed induction generators (DFIG). The control block diagrams for different existing field oriented controllers (FOC), including stator flux oriented control (SFOC), rotor-flux oriented control (RFOC), and air-gap field-oriented control (AFOC), are unified in the same framework. Simulation comparisons...
Conventional Savonius rotor is a ldquoS-shapedrdquo cross-section rotor, the power performance coefficient (CP=0.15) is rather low. This study introduces a new type-helical Savonius rotor, applies calculation fluid dynamics (CFD) to analyze and improve the performance of the rotor from aspects ratio(H/D), number of blades, overlap distance and helical angle(thetas). The results show the performance...
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