Abstract
The article deals with experimental and numerical investigation of an air to air supersonic ejector with twelve primary nozzles. The ejector is supposed to be used for propulsion of a small experimental supersonic wind tunnel which is situated in laboratories of Technical University of Liberec. A novel arrangement with 12 primary nozzles is used. The nozzles are placed at the periphery of the mixing chamber. The secondary stream enters the ejector through the free centre of the mixing chamber and is sucked into the space between the primary nozzles. Moreover the declination of the primary nozzles towards to ejector axis is 8.2° and the shape of the mixing chamber and diffuser walls is given by normal cubic spline function, which was investigated in previous work. The declination of the primary nozzles is supposed to eliminate reversal flow in the centre of the mixing chamber. Experimental results for different numbers of simultaneously activated primary nozzles are carried out. Experimental results are compared to the numerical simulation made with the help of Ansys Fluent software.
Highlights
There are still higher requirements for working efficiency of engineering devices and optimal working regimes are required
The aim of the work is to investigate the supersonic ejector with different count of simultaneously activated primary nozzles
The sudden growths of static pressure for cases of 8 and 12 activated primary nozzles are probably caused by a normal shock wave behind the ejector throat, which can be the reason of high pressure losses in the mixing chamber
Summary
There are still higher requirements for working efficiency of engineering devices and optimal working regimes are required. The ejectors are not an exception, on the contrary, these devices, with their generally low efficiency (less than 30 %), might need more attention than other machinery. The low efficiency is probably the greatest disadvantage of these devices. Advantages of the ejectors are especially absence of moving parts, ointment or seals. Other advantages are a design and a relatively cheap manufacturability. They are mostly used in plants where sufficient amount of the working fluid is available
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