Effectiveness of micro-blowing technique in adverse pressure gradients / Gerard E. Welch [and three others].

Format:

Book

Government document

Author/Creator:

Welch, Gerard E., author.

Contributor:

NASA Glenn Research Center, issuing body.

U.S. Army Research Laboratory

Series:

NASA technical memorandum ; 2001-210690.

ARL-TR (Aberdeen Proving Ground, Md.) ; 2382.

NASA/TM ; 2001-210690

ARL-TR ; 2382

Language:

English

Genre:

Online resources.

Physical Description:

1 online resource (8 pages) : illustrations

Place of Publication:

Cleveland, Ohio : National Aeronautics and Space Administration, Glenn Research Center : U.S. Army Research Laboratory, January 2001.

Summary:

The impact of the micro-blowing technique (MBT) on the skin friction and total drag of a strut in a turbulent, strong adverse-pressure-gradient flow is assessed experimentally over a range of subsonic Mach numbers (0.3<M<0.7) and reduced blowing fractions (0<2F/C(f,0)<1.75). The MBT-treated strut is situated along the centerline of a symmetric 2-D diffuser with a static pressure rise coefficient of 0.6. In agreement with presented theory and earlier experiments in zero-pressure-gradient flows, the effusion of blowing air reduces skin friction significantly (e.g., by 60% at reduced blowing fractions near 1.75). The total drag of the treated strut with blowing is significantly lower than that of the treated strut in the limit of zero-blowing; further, the total drag is reduced below that of the baseline (solid-plate) strut, provided that the reduced blowing fractions are sufficiently high. The micro-blowing air is, however, deficient in streamwise momentum and the blowing leads to increased boundary-layer and wake thicknesses and shape factors. Diffuser performance metrics and wake surveys are used to discuss the impact of various levels of micro-blowing on the aerodynamic blockage and loss.

Notes:

"January 2001."

"Prepared for the 39th Aerospace Sciences Meeting and Exhibit sponsored by the American Institute of Aeronautics and Astronautics, Reno, Nevada, January 8-11, 2001."

"Performing organization: National Aeronautics and Space Administration, John H. Glenn Research Center and U.S. Army Research Laboratory"--Report documentation page."

Includes bibliographical references (page 6).

Online resource; title from PDF title page (NASA, viewed November 20, 2017).

"AIAA-2001-1012."

Other Format:

Print version: Effectiveness of Micro-Blowing Technique in Adverse Pressure Gradients

Microfiche version: Effectiveness of micro-blowing technique in adverse pressure gradients

OCLC:

227941255