[PDF] Deep stall characterization and identification algorithm on a T-tail





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Deep stall characterization and identification algorithm on a T-tail

3 avr. 2015 first observed during a BAC 1-11 test-flight leading to crash. The flight of the tail inside the separated wake of the stalled main wing ...



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50th 3AF International Conference on

Applied Aerodynamics

Toulouse, France, 30-31 March, 1 April, 2015

FP

Deep stall characterizati

Laurent Hetru ,

, , Olivier Montagnier (1) Air Force Research Center (CReA)

Email:

olivier.m (2) nieur, (ce

ABSTRACT

The I q,

INTRODUCTION

e x CmD, Wc q WS T AOA

1.GENERA

q, e q, MODE X U e x `^`xUGJD,

Figure 1. Pitching aerodynamic coefficients for

The a

eCD, eCD, eCmD, qCm qCm q q2 DGDGD

Figure 2.

q

3.TYPICAL PHASE PORTRAIT

e 0 eqD

0wwDCm

0D 0q 0D 0q - Figure 3 q,

4.SHORT PER

q q, spm spm e mV q UUZ[ UUZ D D cos m yI, y coeffi LC qCm deg e s/ 1.52i 04spm 52spm
s/ 1.76i 37spm
89spm

5.PROPOSED DEEP STALL

D, Df max,D Df max,D 3DD!! 5DD spm spm - Figure 4 - Figure s/ deg rad , altitud km10 0D 0DDd 0q 1 3 5 0D 0q 2 4 1DD LC spm 04spm qCm - Figure - Figure 7

6.CONCLUSION

q, that is to say the damping of the short period

7.REFERENCES

NASA Technical Note

matcont: A matlab package for

NASA Technical Paper 3022.

Journal of Aircraft, 3 (6)

Journal of Aircraft, 3 (2

Ministry of Defence reports and

Nonlinear Oscillations, Dynamical

Progress in

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