Abstract
Many systems with liquid ejectors and centrifugal pump are known. Often, jet pumps are used to provide a self-priming mode, as well as an acceptable pressure level for cavitation-free operation. The main disadvantage of such systems is the relatively low efficiency associated with the peculiarities of energy transfer in ejector. To increase efficiency double surface jet pump with driving and suction flow swirl (with circumferential component of velocity) is proposed. The active flow swirling is ensured by using of multi-nozzle tangential nozzle inlet and passive flow part by a special blade system. Combination of these factors makes it possible to improve the efficiency of energy conversion process. In comparison with the known design increases pump efficiency by 10 % – 15 %. Flow swirl also permits to reduce horizontal overall size by increasing the diffuser angle and reducing the mixing chamber length. These positive effects can be achieved by using methods and recommendations given in this paper. The paper also includes ANSYS CFX numerical simulation study results of double surface jet pump and analysis of the impact of nozzle position, length of the mixing chamber and other geometry parameters on pump performance. The results allow optimize the constructive solutions.
Highlights
Jet pumps (JP) are fluidic apparatuses that use for pumping energy of external liquids, gases or vapours
We consider that usage of a central double surface nozzle may be a promising way to improve geometry for increasing JP efficiency
Ejector geometry at the nozzle exit can be identified by three flows areas: 1) Suction annular flow swirled by blades of guiding apparatus (D0 − d1); 2) Driving annular flow swirling by tangential channels (d0`` − d0`); 3) Suction cylindrical flow (d0)
Summary
Jet pumps have a significant drawback – low energy efficiency, not more than 35–40 %. The quality of the process of energy transfer from driving to suction flow in a jet pump directly affects its efficiency. The ways to improve the interaction of flows and reduce losses in the elements of JP include: improving JP flow parts geometry; use of new materials and special coatings; flow swirl; transition from stationary driving flow ejection to non-stationary (pulsating flow JP; JP with rotating nozzle or mixing chamber; JP with a change in the direction of driving flow etc.). As well as using the principles of the Theory of Invention Tasks Solving (TRIZ), a promising JP design was developed, which combines two methods for improving energy transfer efficiency – an interacting flows swirl and a double-surface annular nozzle
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