WIND TUNNEL BOUNDARY LAYER CONTROL RESEARCH ON A HIGH WING, PROPELLER DRIVEN FLYING BOAT WITH AN ALL-BLOWING AND A COMBINED SUCTION-BLOWING BOUNDARY LAYER CONTROL SYSTEM
Abstract
Analysis of wind tunnel test results on a high wing propeller driven flying boat with flap boundary layer control has shown that more efficient lift augmentation is obtained with a combined suction/blowing flap boundary layer control concept in comparison to an all blowing concept. This comparison is based on the same expenditure of horsepower to overcome BLC slot losses. Employment of the combined power-matched concept on the test model gave trimmed maximum lift values with high propeller thrust. Higher values could have been achieved if more suction flow quantity had been available. Attachment of the flap upper surface flow, through BLC, extended (L/D)max to a much wider lift range than without BLC. Limited tests of several flap/slot arrangements showed that the BLC flow quantities required to attach the flap upper surface were not sensitive to BLC slot or flap geometry. A powerful adverse ground effect phenomenon developed at high lifts near the ground. This effect reduced the maximum li t attainable and increased the drag. It is not known how applicable these results are to full scale, since the wind tunnel ground board boundary layer is not representative of full scale. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 16, 1960
- Accession Number
- AD0265633
Entities
People
- B.g. Mullis
- G.f. Deering
- G.w. Schwartz
Organizations
- General Dynamics