Abstract
The article deals with development of an analytical method for predicting flow in an ejector with twelve supersonic nozzles, which are located at the periphery of the mixing chamber of the ejector. Supersonic primary air stream makes the investigation more complex. The secondary air (atmospheric) is sucked in direction of the ejector axis. The shape of the mixing chamber is convergent – divergent and a throat is formed behind the primary nozzles. Each of the primary nozzles can be treated independently so there can be various number of nozzles under operation in the ejector. According to previous investigations, constant pressure mixing is assumed to occur inside a part of the mixing chamber. The method under investigation is considered for isentropic flow in the first approximation and after that the stagnation pressure corrections at the inlets are considered. Furthermore, the decrease in stagnation pressure in the mixing chamber is considered to take losses in the mixing chamber and diffuser into account. The numerical data of the stagnation pressure has been obtained from Ansys Fluent software. In addition, a comparison with previous experimental results is introduced.
Highlights
Nowadays, there are still higher and higher requirements for efficient operation of engineering devices and optimal operating regimes are required
The shape of the mixing chamber is convergent – divergent and a throat is formed behind the primary nozzles
The method under investigation is considered for isentropic flow in the first approximation and after that the stagnation pressure corrections at the inlets are considered
Summary
There are still higher and higher requirements for efficient operation of engineering devices and optimal operating regimes are required. The efficient working regimes are connected with losses and with properly working devices. Ejectors with their low efficiency, generally less than 30 per cent, require more attention and should be investigated in more details. The low efficiency is the most significant disadvantage of these devices. Other advantages are designs and relatively low manufacturing costs. They are usually used in places where sufficient amount of the working fluid is available or in industrial processes where some low-grade thermal energy is available, which is especially highly desirable in these days when new environment-friendly technologies are under development
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