Experimental Study of Tip Clearance Losses and Noise in Axial Turbomachines and Their Reduction

Autor:	F. Kameier, Wolfgang Neise
Rok vydání:	1997
Předmět:	Tip clearance Materials science Turbulence Mechanical Engineering Acoustics Attenuation Turbomachinery Aerodynamics Reduction (mathematics) Gas compressor Noise (radio)
Zdroj:	Journal of Turbomachinery. 119:460-471
ISSN:	1528-8900 0889-504X
DOI:	10.1115/1.2841145
Popis:	An experimental study is described to investigate the negative effects of the tip clearance gap on the aerodynamic and acoustic performance of axial turbomachines. In addition to the increased broadband levels reported in the literature when the tip clearance is enlarged, significant level increases were observed within narrow frequency bands below the blade passing frequency. Measurements of the pressure and velocity fluctuations in the vicinity of the blade tips reveal that the tip clearance noise is associated with a rotating flow instability at the blade tip, which in turn is only present under reversed flow conditions in the tip clearance gap. A turbulence generator inserted into the tip clearance gap is found to be effective in eliminating the tip clearance noise and in improving the aerodynamic performance.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b17e62ba6a5c119a69a5e33a0db2b82c https://doi.org/10.1115/1.2841145 Zobrazit plný text záznamu