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Revision 1.1 – Copyright A. Deperrois – June 2010 日本語訳：稲川貴大 – 2011年2月 F.A.Q : “Point is out of the flight envelope ?”

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Page 1: Point is out of the flight envelopeSpan pos = -679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope Span pos = 679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope

Revision 1.1 – Copyright A. Deperrois – June 2010 日本語訳：稲川貴大 – 2011年2月

F.A.Q : “Point is out of the flight envelope ?”

Page 2: Point is out of the flight envelopeSpan pos = -679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope Span pos = 679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope

Revision 1.1 – Copyright A. Deperrois – June 2010 日本語訳：稲川貴大 – 2011年2月

m [kg/m/s]

n [m²/s] or [centistokes]

m = r.n

r [kg/m3]

Page 3: Point is out of the flight envelopeSpan pos = -679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope Span pos = 679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope

Revision 1.1 – Copyright A. Deperrois – June 2010 日本語訳：稲川貴大 – 2011年2月

C

V

n

Re

n=

VCRe

Page 4: Point is out of the flight envelopeSpan pos = -679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope Span pos = 679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope

Revision 1.1 – Copyright A. Deperrois – June 2010 日本語訳：稲川貴大 – 2011年2月

C

Re

Re

Re

Page 5: Point is out of the flight envelopeSpan pos = -679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope Span pos = 679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope

Revision 1.1 – Copyright A. Deperrois – June 2010 日本語訳：稲川貴大 – 2011年2月

½ rS V2 ICd ICd

½ r S V2 VCd VCd Re

Page 6: Point is out of the flight envelopeSpan pos = -679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope Span pos = 679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope

Revision 1.1 – Copyright A. Deperrois – June 2010 日本語訳：稲川貴大 – 2011年2月

VCd

VCd Icd Re

XFoil

Re

VCd

Re

VCd

XFoil

ICd = 0Cd = VCd

Page 7: Point is out of the flight envelopeSpan pos = -679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope Span pos = 679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope

Revision 1.1 – Copyright A. Deperrois – June 2010 日本語訳：稲川貴大 – 2011年2月

LLT, VLM

Page 8: Point is out of the flight envelopeSpan pos = -679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope Span pos = 679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope

Revision 1.1 – Copyright A. Deperrois – June 2010 日本語訳：稲川貴大 – 2011年2月

1 500

15

0.20

0.03

n 1.5 10–5

NACA 2412

ReRoot

= 0.2 x 15 / 1.5 10–5

= 200,000

ReTip

= 0.03 x 15 / 1.5 10–5

= 30,000

Page 9: Point is out of the flight envelopeSpan pos = -679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope Span pos = 679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope

Revision 1.1 – Copyright A. Deperrois – June 2010 日本語訳：稲川貴大 – 2011年2月

Re=40 000 to

Re=500 000

Page 10: Point is out of the flight envelopeSpan pos = -679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope Span pos = 679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope

Revision 1.1 – Copyright A. Deperrois – June 2010 日本語訳：稲川貴大 – 2011年2月

a

Page 11: Point is out of the flight envelopeSpan pos = -679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope Span pos = 679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope

Revision 1.1 – Copyright A. Deperrois – June 2010 日本語訳：稲川貴大 – 2011年2月

Operating Point” XFLR5.log

Test Wing

July 25, 2008 at 20:27:04

___________________________________

Solving the problem...

Creating the influence matrix...

Solving the linear system...

Calculating the vortices circulations...

...Alpha=1.00

Calculating induced angles...

Calculating aerodynamic coefficients...

Calculating wing...

Span pos = -679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope

Span pos = 679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope

メモ : “.log”ファイルはデフォルトではメモ帳で開かれる。開けなかったら関連づけする

15 m/s Re

Page 12: Point is out of the flight envelopeSpan pos = -679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope Span pos = 679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope

Revision 1.1 – Copyright A. Deperrois – June 2010 日本語訳：稲川貴大 – 2011年2月

Re = 37 000 / Cl = 0.25

Page 13: Point is out of the flight envelopeSpan pos = -679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope Span pos = 679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope

Revision 1.1 – Copyright A. Deperrois – June 2010 日本語訳：稲川貴大 – 2011年2月

Re =30 000

a

a a

Re = 37 000 / Cl = 0.25

Page 14: Point is out of the flight envelopeSpan pos = -679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope Span pos = 679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope

Revision 1.1 – Copyright A. Deperrois – June 2010 日本語訳：稲川貴大 – 2011年2月

a a

a

Page 15: Point is out of the flight envelopeSpan pos = -679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope Span pos = 679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope

Revision 1.1 – Copyright A. Deperrois – June 2010 日本語訳：稲川貴大 – 2011年2月

Test Wing

July 25, 2008 at 20:45:17

___________________________________

Solving the problem...

Creating the influence matrix...

Solving the linear system...

Calculating the vortices circulations...

...Alpha=0.00

Calculating induced angles...

Calculating aerodynamic coefficients...

Calculating wing...

[…]

...Alpha=6.00

Calculating induced angles...

Calculating aerodynamic coefficients...

Calculating wing...

Span pos = -679.00 mm, Re = 36 786, Cl = 0.65 could not be interpolated

Span pos = 679.00 mm, Re = 36 786, Cl = 0.65 could not be interpolated

Re OK

Re=30 000 Cl=0.65

Page 16: Point is out of the flight envelopeSpan pos = -679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope Span pos = 679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope

Revision 1.1 – Copyright A. Deperrois – June 2010 日本語訳：稲川貴大 – 2011年2月

Re = 37 000 / Cl = 0.65

Page 17: Point is out of the flight envelopeSpan pos = -679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope Span pos = 679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope

Revision 1.1 – Copyright A. Deperrois – June 2010 日本語訳：稲川貴大 – 2011年2月

Re = 30 000 Cl

0.65

1. XFoil Re =30k Cl>0.65

実際、近似はこの限界点に達するずいぶん前からかなり怪しいことはほぼ間違いない

Page 18: Point is out of the flight envelopeSpan pos = -679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope Span pos = 679.00 mm, Re = 36 786, Cl = 0.25 is outside the flight envelope

Revision 1.1 – Copyright A. Deperrois – June 2010 日本語訳：稲川貴大 – 2011年2月


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