Inlet geometry and axial Mach number effects on fan noise propagation

1973 ◽  
Author(s):  
D. MATHEWS ◽  
R. NAGEL
Keyword(s):  
Mach Number ◽  
Fan Noise ◽  
Noise Propagation ◽  
Inlet Geometry

Research on the Farfield Tonal Fan Noise at Small Mach Number

2006 ◽  
Author(s):  
Shi-Jian Zhu ◽  
Xian-Jun Wu
Keyword(s):  
Mach Number ◽  
Calculated Result ◽  
Numerical Experiments ◽  
Calculation Model ◽  
Simplified Model ◽  
Full Model ◽  
Tonal Noise ◽  
Fan Noise ◽  
Steady Force

The calculation model of the farfield tonal noise of a subsonic fan was studied in this paper in order to find the main sources of tonal noise. A full model and a simplified model, which neglects the acceleration noise, were brought out. Experiment was done to verify the full model and good fitness were found between the calculated result and the measured result. Numerical experiments were then done to compare among those two models and the Gutin formula, which calculates the acceleration noise of steady force. Results reveal that at small Mach number the simplified model, which takes only the fluctuating force into account, approximates exactly with the full model. Because the noise calculated by Gutin formula is very small, it is concluded that the tonal noise of a subsonic fan with the Mach number less than 0.2 is caused mainly by the fluctuating force. It gives a guideline to cut fan noise down.

CFD-CAA Coupled Computation of Fan Noise Propagation from Engine Nacelle Based on Cartesian Mesh Method

2013 ◽  
Author(s):  
Yuma Fukushima ◽  
Takashi Misaka ◽  
Shinkyu Jeong ◽  
Shigeru Obayashi ◽  
Daisuke Sasaki ◽  
...  
Keyword(s):  
Fan Noise ◽  
Noise Propagation ◽  
Cartesian Mesh ◽  
Mesh Method ◽  
Engine Nacelle

GFD Predictions of Fan Noise Propagation

2004 ◽  
Author(s):  
Damiano Casalino ◽  
Paolo di Francescantonio ◽  
Yann Druon
Keyword(s):  
Fan Noise ◽  
Noise Propagation

scholarly journals The influence of an adaptive nacelle inlet lip on fan noise propagation

2016 ◽  
Author(s):  
Frane Majić ◽  
Gunilla Efraimsson ◽  
Ciarán J. O’Reilly
Keyword(s):  
Fan Noise ◽  
Noise Propagation

Errata Some Aspects of Fan Noise Suppression Using High Mach Number Inlets

1976 ◽  
Vol 13 (1) ◽  
pp. 0064a-0064a
Author(s):  
S.D. Savkar ◽  
S.B. Kazin
Keyword(s):  
Mach Number ◽  
Noise Suppression ◽  
Fan Noise ◽  
High Mach Number ◽  
High Mach

Benchmark of fan noise propagation tools

2008 ◽  
Vol 123 (5) ◽  
pp. 3537-3537
Author(s):  
Jacky Mardjono
Keyword(s):  
Fan Noise ◽  
Noise Propagation
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