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Validation of Pitch moment for subsonic Delta wing

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Old   March 9, 2005, 16:13
Default Validation of Pitch moment for subsonic Delta wing
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Hi everyone,

I am currently studying the Pitching moment of a 70deg delta wing at low alpha (<15) and low Mach numbers (M < 0.15).

From literature, my Cl and Cd values predict relatively close (10%) to experimental values - but my Cm data (pitching moment) is far out.

I understand that the pressure distribution on the leeward side of the delta wing is going to have a large impact on the Cm value - so if your vortex spanwise location is off - your Cm value will be off as well.

Has anyone working in this field - or could point me in the correct direction or suggest sources for experimental data?

Thanks Riaan
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Old   March 9, 2005, 16:28
Default Re: Validation of Pitch moment for subsonic Delta
Jarmo Monttinen
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I'm not working on this and don't know of experimental data, but these suggestions came to my mind as alternates:

About which location are you calculating you Cm, and which location does the experiment use? This might be the source of the problem... if not, then look at the Cp-distribution if possible.

-- Jarmo
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Old   March 9, 2005, 16:36
Default Re: Validation of Pitch moment for subsonic Delta
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I took the same position and same non-dimensionalizing value of length...first thing I checked !
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