Method and apparatus for reducing high-cycle fatigue and suppres

Details Method and apparatus for reducing high-cycle fatigue and suppres Method and apparatus for reducing high-cycle fatigue and suppres

1998-08-05

2000-02-22

Look, Edward K.

Rotary kinetic fluid motors or pumps

With sound or vibratory wave absorbing or preventing means...

415 1, 415 36, 415 30, 415 44, 415115, 415116, 415118, 415142, 415914, F01D 2504

Patent

active

060273054

ABSTRACT:
A stator apparatus for mounting upstream of an intake to a rotating machine which blows pressurized air, or other media, from discharge orifices at a pressure and velocity to minimize velocity defects or turbulence in the wake of the stator prior to the plane of rotation of a rotating member of the machine. The rotating member then encounters a substantially uniform velocity medium at the plane of incidence, which substantially reduces uneven loading on the rotating member, thereby reducing noise and reducing high-cycle failure of that rotating element. The distribution and size of the orifices is determinable by placing the stator apparatus in a wind tunnel, or on the intake of a apparatus simulating the intake of the rotating machine, measuring the turbulence or velocity defects in the stator wake, and modifying the distribution and size of the orifices until the turbulence is minimized.

REFERENCES:
patent: 5782603 (1998-07-01), O'Brien et al.
patent: 5813828 (1998-09-01), Norris
patent: 5833433 (1998-11-01), May et al.
patent: 5876182 (1999-03-01), Schulte
Cimbala, J. M., et al., "An experimental investigation of the turbulent structure in a two-dimensional momentumless wake," Journal of Fluid Mechanics, vol. 213, 1990, pp. 479-509.
Dirlik, S. P., et al., "Experimental evaluation of a 50-percent thick airfoil with blowing and suction boundary layer control," AIAA-92-4500-CP, pp. 427-445.
Waitz, I. A., et al., "Preliminary assessment of wake management strategies for reduction of turbomachinery fan noise," Journal of Propulsion and Power, vol. 12, No. 5, Sep.-Oct., 1996, pp. 958-966.
Corcoran, T. E., "Control of the wake from a stimulated blade by trailing-edge blowing," Graduate Thesis for Lehigh University, Jan. 1992.

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