Abstract
In the paper, the hydrodynamics of the liquid-gas mixture in the mixing chamber of the ejectors at different spatial positions was analyzed and the comparative study of such ejectors was carried out. It was found that a more ordered mode of movement of the mixture in the mixing chamber is created as a result of the coincidence of the velocity vector of liquid drops and the direction of gravity in the vertical position of the ejectors. This leads to increasing the volume entrainment ratio almost twice. The analysis of the liquid-gas mixture flow in the mixing chamber, evaluation calculations and research allowed to develop and to patent a jet apparatus with a conical-cylindrical (combined) mixing chamber. It was also found that for such ejectors, the volume entrainment ratio is 15–55% higher than for a jet apparatus with a cylindrical mixing chamber due to the reduction of the resistance of the passive flow into the mixing chamber and prevention of the formation of reverse-circulating flows. A study has been conducted on liquid-gas ejectors in the range of the main geometric parameter m (ratio of the mixing chamber area to the nozzle area) 9.4–126.5, which allowed to establish its rational values at which the maximum volume entrainment ratio is achieved (m = 25–40).
Highlights
A jet apparatus is rather simple and reliable equipment that has not been fundamentally changed since its invention and at the same time, it is complex in terms of processes occurring in the flow part [1,2,3,4]
A study has been conducted on liquid-gas ejectors in the range of the main geometric parameter m 9.4–126.5, which allowed to establish its rational values at which the maximum volume entrainment ratio is achieved (m = 25–40)
Study of the hydrodynamics of the liquid-gas mixture in the mixing chamber and the operation of the ejector at various spatial locations. Both the vertical and the horizontal placement are well known in the practice of using ejectors. It needs to be investigated whether the spatial position affects the operational characteristics of ejectors operating in a subsonic mode
Summary
A jet apparatus (ejectors) is rather simple and reliable equipment that has not been fundamentally changed since its invention and at the same time, it is complex in terms of processes occurring in the flow part [1,2,3,4]. A significant disadvantage of such an apparatus is the low efficiency, which does not usually exceed 30 %, that is a stimulus to find more advanced designs. Since the main components of the jet apparatus are the receiving chamber, the mixing chamber, the working nozzle (sprayer) and the diffuser, their design, position relative to other elements and geometric dimensions have a significant impact on the effective operation of the ejector [5,6,7,8]. If the phase flow rate is expressed in units of mass, the entrainment ratio is mass. For water-gas ejectors, this ratio is usually expressed in terms of the volumetric flow rates of the phases.
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