Journal
AEROSPACE SCIENCE AND TECHNOLOGY
Volume 93, Issue -, Pages -Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ast.2019.105323
Keywords
Low-speed fan; Recess vaned casing treatment; Stall margin improvement; Flow topology
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Funding
- National Natural Science Foundation of China [51576162]
- NPU's Exchange Funding [2018]
- National Science and Technology Major Project [2017-II-0005-0018]
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This paper studies the effect of inlet angle of guide vane in the recess vaned casing treatment (RVCT). The smooth casing fan and the casing treated fans with different vane angles have been numerically simulated respectively. The result shows that the application of RVCT brings about noticeable improvements in the fan's stall margin and the modification of guide vane inlet angle leads to various effects. RVCT functions as a bridge that contributes to the extra flow circulation at the blade tip region and mitigates the flow blockage. The inlet angle of guide vane determines the amount as well as the potential in terms of accommodating fluid passing through the RVCT. Based on the evolution of flow topology, it is hypothesized that the separation on the guide vane surface is a prerequisite to the stall of the fan. The scenario that the attachment line totally blocks the vane inlet passage is a criterion of the stall. The deflection of inlet angle from positive to negative enables to enhance the stall margin by delaying the formation of the prerequisite and the criterion of the stall. (C) 2019 Elsevier Masson SAS. All rights reserved.
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