Fwd: Boundary layer thickness

[j...@oxaero.com]

Begin forwarded message:

From: "j...@oxaero.com" <j...@oxaero.com>
Date: August 7, 2012 8:20:24 AM CDT
To: Thomas Henrik Hertzfelder Hansen <th...@kth.se>
Cc: Jari Hyvärinen <jari.hy...@linflow.se>
Subject: Re: Boundary layer thickness

Thomas,

I intend to place a tiny Pitot on, or near, the top surface of my Standard Cirrus wing, 

at about .2 chord position.  This will be at a span station half way between the wing root 

and the air brakes, chord length about .8 m.  I want to see the change in boundary flow speed with a 

very small rear-facing step near the leading edge over a range of airspeeds around 50 kts.

Also, if premature detachment occurs, I wish to lift the Pitot slightly from the surface to

detect the height of the separated flow.  I need to know the best diameter for a thin-wall tube 

to use for the Pitot.

So, I need to a rough idea of the thickness of the attached laminar boundary layer near .2 chord

on the top surface at 50 kts (93 k/hr) airspeed (AOA +3.3 degrees).

The airfoil is close to Wortmann FX S 02-196.

Your help is appreciated.

Thanks,

Jim Hendrix

On Aug 7, 2012, at 4:40 AM, Thomas Henrik Hertzfelder Hansen <th...@kth.se> wrote:

Sure!

You meant the nose of the aircraft? Please tell me in detail what data you want and how you want them. 

Also, at what flight condition do you want the boundary layer thickness?

Regards, 

Thomas

---

From: Jari Hyvärinen [jari.hy...@linflow.se]
Sent: 06 August 2012 12:47
To: Thomas Henrik Hertzfelder Hansen
Subject: Fwd: Boundary layer thickness

Hej Thomas,

Jim har behov av lite gränskiktsdata enligt nedan. Detta borde gå att plocka ur dina beräknings resultat.

Har du tid och möjlighet att hjälpa Jim med detta ?

Mvh

Jari

-------- Ursprungligt meddelande --------

Ämne:	Boundary layer thickness
Datum:	Sat, 4 Aug 2012 11:24:10 -0500
Från:	j...@oxaero.com <j...@oxaero.com>
Till:	Jari Hyvärinen <jari.hy...@linflow.se>

Jari,

I am planning some experiments measuring the average laminar boundary layer speed and need to know the thickness of the laminar boundary layer from the nose to the detachment point.  I am sure that your model already gives this.  Can you supply me with that information?

I plan to tape a tiny Pitot to the surface and need to know a good diameter to use.

Thanks,
Jim