Magnetic nondestructive testing of rotor blade tips

2015 ◽  
Vol 117 (17) ◽  
pp. 17A705 ◽  
Author(s):  
E. Cardelli ◽  
A. Faba ◽  
R. Marsili ◽  
G. Rossi ◽  
R. Tomassini
Keyword(s):  
Nondestructive Testing ◽  
Rotor Blade ◽  
Magnetic Nondestructive Testing ◽  
Blade Tips

scholarly journals Magnetic Nondestructive Testing Techniques of Constructional Steel

2016 ◽  
Vol 43 ◽  
pp. 03002
Author(s):  
Er-gang Xiong ◽  
Na-na Zhao ◽  
Zhao-qi Yan ◽  
Lan-wei Yang ◽  
Han He
Keyword(s):  
Nondestructive Testing ◽  
Constructional Steel ◽  
Magnetic Nondestructive Testing ◽  
Testing Techniques

Effect of Blade Tip Modifications for Unducted Propulsors on Tip Vortex-Rotor Interaction Noise

2014 ◽  
Author(s):  
Florian Danner ◽  
Christofer Kendall-Torry
Keyword(s):  
Rotor Blade ◽  
Stokes Equations ◽  
Acoustic Emissions ◽  
Tip Vortex ◽  
Navier Stokes ◽  
Navier Stokes Equations ◽  
Tip Vortices ◽  
Blade Tip ◽  
Blade Loads ◽  
Blade Tips

Front rotor tip vortices impinging on a downstream blade row of an unducted propulsor induce distinct unsteadiness to blade loads with associated sound emissions. Since the region of unsteadiness is concentrated near the blade tips, reducing the rear rotor tip diameter represents a potential means for minimising interaction noise. A survey on the aeroacoustic effects resulting from a cropped rear rotor in combination with a front rotor blade tip modification is therefore presented. Analyses are based on data from computational fluid dynamics solutions with the Reynolds-averaged Navier-Stokes equations and direct acoustic predictions. The evaluation of polar directivities, blade surface pressure disturbances and details of the unsteady flow field provide insight into the underlying phenomena. Results show that an arbitrary reduction of the rear rotor tip diameter does not necessarily decrease noise radiation and that winglet-like structures applied to the front rotor blade tips are capable of reducing acoustic emissions due to tip vortex-rotor interactions.

scholarly journals Investigation of Design Features of Compressor Casing Treatment

2014 ◽  
Vol 61 (1) ◽  
pp. 153-161
Author(s):  
Vitaliy Nezym
Keyword(s):  
Rotor Blade ◽  
Axial Compressor ◽  
Design Features ◽  
Casing Treatment ◽  
Groove Configurations ◽  
Compressor Performance ◽  
Operational Range ◽  
Blade Tips

Abstract Casing treatment in the form of circumferential grooves over a rotor blade tips is used for improvement of an axial compressor performance. Usually, these grooves extend compressor’s stall range (stable operational range) but decrease its efficiency. In the paper, there are presented main results of investigations on grooves that influence positively efficiency of compressor. There were investigated traditional (typical) and newly developed groove configurations. Certain grooves combine increase in efficiency with extension in stall range.

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