Comparative Analysis of Vortex Ejector and Jet Pump Characteristics
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COMPRESSORS, PUMPS, AND PIPELINE FITTINGS COMPARATIVE ANALYSIS OF VORTEX EJECTOR AND JET PUMP CHARACTERISTICS A. N. Mikhal’chenkova,1 M. G. Lagutkin,2 and E. Yu. Baranova2
UDC 66.063
The energy indexes of vortex ejector and jet pump performance are compared. The mixed media in the studied ejection process are liquids. The calculation schemes of the devices are given. The operation principle and design differences of the vortex ejector and the jet pump are described. The algorithms for calculations of the geometric parameters of vortex ejectors and jet pumps are given. Conclusions are drawn about the overall dimensions of the compared devices for different ejection factors and power consumptions. Keywords: vortex ejector, jet pump, energy balance, liquid ejection, calculation scheme, liquid flow, performance.
For dosed mixing of two fluid streams, commonly jet pumps are used, which enables one, in addition, to discard pressure devices for transporting one of the mixing streams. The feasibility of use of vortex ejectors for mixing gas media [1] and liquid media [2–4] for wastewater treatment in purification works [5] were investigated. Calculations methods were developed [1, 3] for vortex ejectors functioning in gas−gas and liquid−liquid systems. Technological calculations of a vortex liquid ejector were presented in the method in [6], but without a comparative analysis of power consumptions for the vortex ejector and jet pump functioning. The goal of this study was to analyze power consumptions for implementation of the process of mixing of two liquid streams in a vortex liquid ejector and a jet pump with identical technological parameters of their operation and to compare overall dimensions of these devices. In the vortex liquid ejector operation process (Fig. 1), the ejecting liquid enters a cylindrical chamber 1 (through an ejecting liquid injection nipple 2 placed tangentially to the chamber 1) and swirls. In this process, along the axis of the cylindrical chamber 1, a vacuum space is formed, whereby the liquid is sucked in through the ejected liquid injection nipple 3 placed coaxially to the axis of the cylindrical chamber. As a result, the ejecting and ejected liquids are mixed and discharged through the mixed liquids stream discharge nipple 4 placed tangentially to the cylindrical chamber [6]. The efficiency of the vortex liquid ejector (as well as of the jet pump) functioning is estimated by the ejection factor U which is equal to the ratio of the mass flow rates of the ejected and the ejecting liquids. In the jet pump (Fig. 2), the ejecting liquid (as a jet) is fed through the working nozzle A set coaxially to the receiving chamber B and in the vortex liquid ejector, through the ejecting liquid injection nipple 2 (Fig. 1) placed tangentially to the cylindrical chamber 1. 1
All-Russian Scientific Research and Design Institute of Chemical Machine Building JSC (AO NIIkhimmash), Moscow, Russia; e-mail: [email protected]. 2 Moscow Polytechnic University (Moskovskii Politekhnicheskii Universitet), Russ
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