7Sandra V S,Rafael B T, Carlos S M, et al. Reduction of the aerodynamic tonal noise of a forward-curved cen- trifug',d fan by modification of the volute tongue geome- try [ J ]. Applied acoustics,2008 ( 69 ) : 225-232.
8Datong Qi, Yijun Mao, Xiao liang Liu. Experimental study on the noise reduction of an industrial forward- curved blades centrifugal fan[J].Applied Acoustics, 2009,70( 8 ) : 1041-1050.
9Smagorinsky J. General circulation experiments with the primitive equations : I The basic experiment [ J ]. Monthly Weather Review, 1963,91 (3) : 99-164.
10Hunt J , Wray A, Moin P. Eddies stream and conver- gence zones in turbulent flows[ C]. 1988 Summer Pro- gram, Center for Turbulence Research Report, 1988: 193 -208.