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contributor authorTamaki, Hideaki
date accessioned2019-03-17T11:01:00Z
date available2019-03-17T11:01:00Z
date copyright12/5/2018 12:00:00 AM
date issued2019
identifier issn0742-4795
identifier othergtp_141_04_041026.pdf
identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4256531
description abstractA centrifugal compressor requires a wide operating range as well as a high efficiency. At high pressure ratios, the impeller discharge velocity becomes transonic and effective pressure recovery in a vaned or vaneless diffuser is necessary. At high pressure ratios, a vaned diffuser is used as it has high pressure recovery, but may have a narrow operating range. At low flow, diffuser stall may trigger surge. At high flow, choking in the throat of the vanes may limit the maximum flow rate. A low solidity diffuser allows a good pressure recovery because it has vanes to guide the flow and a wide operating range as there is no geometrical throat to limit the maximum flow. In experimental studies at a pressure ratio around 4:1, the author has replaced vaned diffusers with a range of low solidity diffusers to try to broaden the operating range. The test results showed that the low solidity diffuser also chokes. In this paper, a virtual throat is defined and its existence is confirmed by flow visualization and pressure measurements. A method to select low solidity diffusers is proposed based on test data and the fundamental nature of the flow. The extension of the proposed method to the selection of a vaneless diffuser is examined and a design approach for a vaneless diffuser system to minimize surge flow rate without limiting the attainable maximum flow rate is proposed.
publisherThe American Society of Mechanical Engineers (ASME)
titleA Study on Matching Between Centrifugal Compressor Impeller and Low Solidity Diffuser and Its Extension to Vaneless Diffuser
typeJournal Paper
journal volume141
journal issue4
journal titleJournal of Engineering for Gas Turbines and Power
identifier doi10.1115/1.4041003
journal fristpage41026
journal lastpage041026-16
treeJournal of Engineering for Gas Turbines and Power:;2019:;volume( 141 ):;issue: 004
contenttypeFulltext


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