The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 17, 2001
Filed:
Nov. 01, 1999
Adnan Eroglu, Untersiggenthal, CH;
Franz Joos, Weilheim-Bannholz, DE;
Bettina Paikert, Oberrohrdorf, CH;
Cristian Oliver Paschereit, Baden, CH;
Jakob J. Keller, late of Wohlen, CH;
ABB Alstrom Power (Schweiz) AG, Baden, CH;
Abstract
In heat generators and burners, it is frequently necessary to realize discontinuous cross-sectional expansions of a flow duct. When the flow (U) passes over the step (,) formed in the wall (,) of the flow duct, coherent lateral separation vortices form which are propagated almost undamped downstream of the step and frequently represent the cause of thermo-acoustic vibrations of high amplitude. In accordance with the invention, vortex-generating elements (,) with a lateral pitch dimension (t) are arranged on a line transverse to the main flow (U) a distance (s) upstream of the step (,). Given an expedient selection of the pitch dimension (t), the lateral coherence of the separation vortex is enduringly destroyed.