z 

"FLEXWALL 3 SO: A SECOND ORDER PREDICTIVE 

A 

STRATEGY FOR RAPID WALL ADJUSTMENT IN 

TWO-DIMENSIONAL COMPRESSIBLE FLOW 

(NASA-CR-181662) FLEXIWALL 3 SG: A SECOND N88-22~ 18 

OEDER PPEDICTIVE STRATEGY FOR RAPID WALL 

A i) J U S T ME MT 

PLOW (;outhampton Univ. ) 59 p CSCL UlA Unclas 

IN T U 3 - D I M ENS1 0 El AL COPl PE ES SI UL 2 

G3/(12 (7 142324 

, 

L 

Michael Judd 

July 1981 
c 

z 

"FLE5WALL 3 SO": A SECOND ORDER PREDICTIVE 

STRATEGY FOR RAPID WALL ADJUSTMENT IN 

TWO-DIMENSIONAL COMPRESSIBLE FLOW 

Michael Judd 

July 1981 

This report was prepared under contract to The University of Southampton in 

support of NASA Grant NSG-7172 entitled "The Self-streamlining of the Test Section of 

a Transonic Wind Tunnel". The Principal Investigator is Dr. M. J. Goodyer. 

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5,22 0,3221 

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F dsJ4 1:: 

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I'- - 
A 

. 

. Report No. 

NASA CR-181662 

Report Documentation Page 

2. Government Accession No. 

21. No. of pages 

r. Authork) 

22. Price 

Michael Judd 

3. Performing Organization Name and Address 

University of Southampton 

Department of Aeronautics and Astronautics 

SO9 5NH Hampshire 

ENGLAND 

2. Sponsoring Agency Name and Address 

National Aeronautics and Space Administration 

Langley Research Center 

Hampton, VA 23665-5225 

5. Supplementary Notes 

3. Recipient's Catalog No. 

5. Report bte 

July 1981 

6. PerfOrITImQ Organization Code 

~ 

8. Performing Organization Report No. 

10. Work Unit No. 

505-61-01-02 

11. Contract or Grant No. 

NSG7 172 

13. Type of Report and Period Covered 

Contractor Report ~__ 

14. Sponsoring bgency Code 

Technical Monitor: Charles L. Ladson 

6. Abstract 

The author presents an improvement to his existing two-dimensional (2-D) 

strategies for adjustment of the flexible top and bottom walls of an Adaptive 

Wall Test Section (AWTS). This adjustment is part of the wall adaptation process 

to eliminate top and bottom wall interference at its source. The improvements 

to account for second order effects are described in mathematical detail. It is 

intended that these improvements should further minimize the necessary iterations 

in the wall adaptation process. An associated computer program written in BASIC 

is presented and several test cases run with this program are discussed. The 

strategy performs well for a theoretical test case but when applied to experimental 

AWTS data, some discrepancies in the adapted wall shapes are found. The author 

concludes that further study of the new strategy is required. 

17. Key Words (Suggested by Authorls)) 

Adaptive walls 

2-D wall adjustment strategy 

2-D wall interference 

Flexible walled wind tunnels 

19. Security Classif. lof this reponl 20. Securw Classif. (of I 

18. Distribution Statement 

Unclassified - Unlimited 

I 56 I Unclassified I Unclassified 1 I I 

NASA FORM 1626 OCT 85 

~~