Fluid handling – Processes – Affecting flow by the addition of material or energy
Patent
1996-01-16
1997-01-21
Chambers, A. Michael
Fluid handling
Processes
Affecting flow by the addition of material or energy
137828, 137833, F15C 104
Patent
active
055952054
ABSTRACT:
Turbulence is controlled in boundary layer or wall-bounded fluid flow fields having a turbulent wall region characterized by a system of roll pairs extending in the direction of flow, and obliquely propagating structures interacting with the system of roll pairs, by locally introducing into the turbulent wall region two separate disturbances that are effective to produce, in a local region, a composite disturbance field that is strongly coupled to and modifies the obliquely propagating structures in a manner that increases or decreases the interaction of the propagating structures with the system of roll pairs thereby locally increasing or decreasing the turbulence in the flow field. One of the disturbances may result from the interaction of the fluid with a linear strip, or an array of strips, of delta-shaped protrusions positioned spanwise on the wall (i.e., transverse to the flow direction); and the second disturbance may result from injecting sonic energy into the local region. Furthermore, a linear strip or an array of airfoil shaped protrusions can be used for producing a pair of counter rotating rolls for controlling turbulence in the boundary layer.
REFERENCES:
patent: 4932610 (1990-06-01), Maestrello
patent: 4998553 (1991-03-01), Schram
patent: 5040560 (1991-08-01), Glezer et al.
patent: 5114099 (1992-05-01), Gao
L. Sirovich et al. "Plane Waves and Structures in Turbulent Channel Flow", American Institute of Physics, Dec. 1990, pp. 2217-2226.
L. Sirovich et al. "Propagating Structures in Wall-Bounded Turbulent Flows", Theoretical and Computational Fluid Dynamics, pp. 307-317.
L. Sirovich et al., "Drag Reduction in Turbulent Channel Flow by Phase Randomization," Physics of Fluids A, vol. 5, pp. 686-694, 1993.
Bronicki Lucien Y.
Levich Evgene
Sirovich Lawrence
Chambers A. Michael
Orlev Scientific Computing Ltd.
Sandler Donald M.
LandOfFree
Method of and apparatus for controlling turbulence in boundary l does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of and apparatus for controlling turbulence in boundary l, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of and apparatus for controlling turbulence in boundary l will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2319243