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Jet-flapped airfoils in ground proximity

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17 and (29b) The equations and boundary conditions which determine the linear components follow directly from (7), (8), (…
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18 where ~ (X, ::= (37) (38) o I F; (x) = f; x' ~ J T Ie." \ \ (" ; x ) it ) J..., (39) o Combining…
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Camber (y-case) , 2.,jI-Xa' *" J ~(X) ~(X;~J).) J)( o I = 2.fo;;.1' -.:.. h(X) .r.. (K; X., J,) <f…
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20 , One difficulty in the series expression for G..,.. (qJ) should be noted. Combining equations (24) j (30b) and (33) g1.…
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21 components is to be determined. The four possibilities, corresponding respectively to equations (40), (41), (42) and (43…
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22 is given by the vortex distribution alone. This relation is simply = ~ (x) (51) For small disturbances the associated…
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I Similar expressions for 4 hex) cJ" o and 4 L~ (x) Jx may be found when o specific mean line and thickness shape…
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24 It is convenient to calculate the linear effects separately as was done in the case of the lift coefficient. Therefore (…
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IV. SAMJ?LE RESULTS FOR THE LIFT AND JET-FLAP SHAPE Sample results obtained by using the trigonometric series expansion and…
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IX -case Cj 0.0 .25 1.0 2.25 4.0 Ao .135 .238 .420 .615 .816 Al .025 -.039 - .131 -.213 -.292 '~\2 -.…
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(. c. ~ J J 0 .25 1.0 2.25 4.0 ~ .681 l. 961 4.377 7.242 10.56 ~Cl 7.482 + 4.l04C j 8.362 ~CIC 10.30 12.89…
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r \ ! ! Fig. 28 Lift Coefficient and Jet-Flap Shape ( Jet - Flap Oeflectlo.n}
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29 FlQ. 4 Lift Coefficient and Jet-Flap Shape (Anale of Attack )
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I l. 30 - -I: ',-- , .•. 1- H+'!Ht,'1+ ++~l ,.~.... t'l' .t r \:· ..... "…
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31 V. DISCUSSION The methods developed herein for the determination of sectional lift characteristics of unflapped and jet-…
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located too far downstream to adequately characterize the jet flap. The relative error in lift as C j ..... 0 is large only…
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present. Truncation of the trigonometric series therefore results in errors for both ;; !/.;.,J1( ) , and ~. (x. I VII…
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34 that are increasingly inaccurate far downstream. The distance downstream to which the jet-flap shape calculations may be…
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35 ii. Using the series expansions given by equations (45) and (46), the jet-flap shape calculations are less precise than…
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36 This relative error diminishes in Figure D-l for larger h-va1ues. For smaller clearances qualitative agreement remains but…
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37 this discussion the assessment of the linearized model will be based pri- marily on the results of more sophisticated…
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38 and limiting values of the jet coefficient for the ~ -case is given by Lissaman (Ref. 14). The iterative calculations of…
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importance at low clearance. Because these viscous effects are largely unknown it is difficult to properly assess the…
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1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. REFERENCES Foa, J.V. et aI, "High Speed Mass Transportation…
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15. Milne-Thomson, L.M., Theoretical Hydrodynamics, MacMillan, 1955. 16. Kuethe, A.M. and Schetzer, J.D., Foundations of…
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