The centrifugal pump is one of the most widely used types power machinery in field ship and ocean engineering, shape impeller blade trailing edge has an important influence on their performance. To reveal mechanism effect different edges external performance, internal flow 16 a pump, consisting Bezier edges, rounding pressure side, cutting suction original studied by numerical simulation. rever...

This work reviews the current operational condition and activities on design modification for different applications of ejectors. Ejectors being a simple mechanical system capable performing multiple fluid related functions (vacuum generation, pumping, mixing, condensing heat exchanging), have been an essential part several industrial processes. Two areas emphasized; internal flow application-b...

SUMMARY The aerodynamic design and experimental performance of a centrifugal compressor designed for a pressure ratio of 6.5 and a specific speed of 68 are described, The compressor consisted of a radially-vaned impeller and a transonic, vaned radial diffuser. At design speed a peak overall total-to-total isentropic efficiency of 0.746 was achieved at the maximum pressure ratio of 5.9, rising t...

Hypersonic vehicles with single-stage-to-orbit (SSTO) capability present a major design challenge. Such vehicles reflect highly integrated airframe and propulsion systems and are also known to exhibit a large degree of interaction between the airframe and engine dynamics. Consequently, even simplified hypersonic models are characterized by tightly coupled nonlinear equations of motion. The vehi...

Abstract To reduce the energy consumption of large centrifugal pumps, modified heuristic intelligent algorithms are used to directly optimize diffuser pumps. Considering hydraulic efficiency under design condition as optimization target, in this study, 14 geometric parameters such inlet diameter, outlet and leading trailing vane angles selected variables, particle swam gravitational search algo...

To improve the transport performance of a rotodynamic multiphase pump for gas–liquid mixture, we took head and efficiency index at rated flow rate with 15% inlet gas volume fraction as indices, used orthogonal test design method CFD technology to optimize. We selected blade shroud angles leading edge trailing edge, axial length impeller, well incidence angle number diffuser, total five factors ...

In this paper, we report a simple technique for the fabrication of planar valveless micropumps. The technique utilizes MEMS fabrication methods by using a double sided etch technique. Instead of using several masks and process steps, an anisotropic wet etch technique at both sides of a silicon substrate is implemented at the same time for creating the pump membrane and the diffuser/ nozzle elem...

A new approach to the evaluation of the performance of diffusers is presented. It is assumed that part of the juice in bagasse is easily extracted, by mill o r diffuser, and attention is therefore focussed on the remaining tightly-held or bound juice. This "difficult juice" is defined according to an analytical method. Preliminary results on the performance of diffusers, based on the extraction...

Personal electronic devices such as cell phones and tablets continue to decrease in size while the number of features and add-ons keep increasing. One particular feature of great interest is an integrated projector system. Laser pico-projectors have been considered, but the technology has not been developed enough to warrant integration. With new advancements in diode technology and MEMS device...