TITLE

Numerical Assessment of a Novel Concept for Mitigating the Unsteady Pressure Pulsations Associated to Decelerating Swirling Flow with Precessing Helical Vortex

AUTHOR(S)
Tanasa, Constantin; Susan-Resiga, Romeo; Muntean, Sebastian; Stuparu, Adrian; Bosioc, Alin; Ciocan, Tiberiu
PUB. DATE
December 2015
SOURCE
AIP Conference Proceedings;2015, Vol. 1702, p1
SOURCE TYPE
Conference Proceeding
DOC. TYPE
Article
ABSTRACT
Decelerated swirling flows in conical diffusers can develop self-induced instabilities for some configurations of incoming flow. As a result, an upstream steady and axis-symmetrical flow becomes unsteady and three-dimensional with associated pressure fluctuations that hinder the operation of tubomachines. This paper introduces a new approach for mitigating the swirling flow instabilities using a diaphragm into the cone. As a result, the severe flow deceleration is diminished, taming the precessing helical vortex and its associated pressure fluctuations. A full three-dimensional unsteady numerical study is performed for swirling flow apparatus developed at the Politehnica University of Timisoara. Fourier spectra corresponding to unsteady numerical data acquired without and with diaphragm are compared in several locations displaced along to the element of the cone in order to assess the novel concept. It is clearly revealed that the diaphragm mitigates the unsteadiness effects associated to the swirling flow with precessing helical vortex in the conical diffuser. The novel concept paves the way towards a new passive control technique.
ACCESSION #
112185924

 

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