Regenerative liquid ring pumps review and advances on design and performance

Abstract

The regenerative liquid ring (RLR) pump is a type of rotodynamic machine which has the ability to develop high heads at relatively low flow rates in only one impeller stage. Although the exact principle of operation of this type of pump has been a phenomenon not fully understood, it has nevertheless been widely applied for over a century in areas of liquid pumping. Despite the low efficiency, RLR pumps have several advantages over other turbomachines with similar tip speed due to relatively low manufacturing costs, simplicity, high reliability, enhanced priming behaviour and can in many applications offer a more efficient alternative. Efficiency improvements are key to reducing energy consumption and ultimately combatting the global climate change. This paper offers an extensive review into the development, performance challenges and design improvements of RLR pumps in order to provide some useful insight on future research and next steps, with a particular focus on improving efficiency throughout the pump life cycle.

Energy efficiency analysis of steam ejector and electric vacuum pump for a turbine condenser air extraction system based on supervised machine learning modelling

“…The liquid ring vacuum pump consists of a cylindrical casing partly filled with liquid and an eccentrically positioned impeller with blades [26,27]. The impeller blades create impeller blade cell, causing a change in volume due to the eccentric shape so that at the inlet side of the pump they create vacuum and overpressure at the outlet side [26,27].…”

“…The liquid and gas phases are constantly interacting in the pump. If a two-phase, liquid and gas mixture is pumped the centrifugal force of the impeller separates the gas and liquid phases [26,27]. The liquid phase is used as a sealing agent of the pump casing and contributes to the compression of the pumped gas phase that is compressed in the impeller blade cells [26,27].…”

Bayesian network approach to fault diagnosis of a hydroelectric generation system

“…[12][13][14] National Energy Administration issued that 80% of HGS' faults are caused by the vibration of the hydraulic-mechanic-electric components. [12][13][14] National Energy Administration issued that 80% of HGS' faults are caused by the vibration of the hydraulic-mechanic-electric components.…”

“…Faults in the hydroelectric generation systems (HGS) inevitably result in unexpected safety accidents with enormous maintenance costs. [12][13][14] National Energy Administration issued that 80% of HGS' faults are caused by the vibration of the hydraulic-mechanic-electric components. 15,16 In general, the vibration in the HGS is defined as a drastic reciprocating motion caused by unbalanced forces and uncertain disturbances.…”

Bubble Size and Bubble Concentration of a Microbubble Pump with Respect to Operating Conditions

“…Until now, researchers on regenerative turbomachinery have been interested in improving efficiency and performance. Karlsen-Davies and Aggidis [15] reviewed overall aspects of regenerative pumps and their basic principle of operation, areas of application, performance challenges, and the improvement of geometrical parameters. Quail et al [16] carried out parametric design through one-and three-dimensional numerical techniques and Jeon et al [17] tried to enhance the pump performance using an optimized design.…”