MATEC Web Conf.
Volume 345, 202120th Conference on Power System Engineering
|Number of page(s)||15|
|Published online||12 October 2021|
Theoretical foundations of increasing the efficiency of wide-angle diffusers and practical results of new solutions to this problem
National Research University “Moscow Power Engineering Institute, Institute of power engineering and mechanic, Department of steam and gas turbines, Krasnokazarmennaya 14, 111250 Moscow, Russian Federation
* Corresponding author: email@example.com
It is shown theoretically that the efficiency of wide-angle diffusers mainly depends on the method of supplying the working medium to the diffuser channel and on the nature of the interaction of this medium with the subsequent streamlined surface of the diffuser. The first condition is due to those changes in the acting force factors within the wall (boundary layer), which occur during the transition from the inlet confuser channel to the subsequent diffuser, and the second follows from the need to ensure an uninterrupted flow of the working medium moving against the increasing (in the direction of travel) static pressure. The above computational studies of wide-angle diffusers have shown that, subject to theoretically justified conditions, it is possible to ensure uninterrupted flow in flat and conical diffusers with an increase in the opening angle α of their flow path to 20° and with the same degrees of expansion ration to obtain pressure recovery coefficients commensurate with those in diffusers with an angle α = 7°.
© The Authors, published by EDP Sciences, 2021
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