Diffuser with backward facing step having varying step height

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United States of America Patent

PATENT NO 9109466
APP PUB NO 20130019583A1
SERIAL NO

13468157

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Abstract

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A diffuser (30) expanding a gas flow (F) upstream of a heat recovery steam generator (32) of a combined cycle power plant (34). An outer wall (44) of the diffuser includes a smoothly lofted backward facing step (46) effective to fix a location of a flow recirculation bubble (56) under conditions conducive to flow separation. The step has a varying step height (Hpeak, HvaIley) about a circumference of the step edge (62). The varying step height segments the recirculation bubble into small cells (66) located downstream of each peak (58) of the step height and reducing a reattachment length (L) of the bubble, thereby facilitating a reduction of the overall length of the diffuser.

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Patent Owner(s)

  • THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Eaton, John K Stanford, US 8 118
Lo, Kin Pong Fremont, US 29 784

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