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Questions tagged [laminar-flow]

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Does the pressure recovery on an airfoil cause separation more with turbulent BL’s?

If you have a turbulent boundary layer going through pressure recovery on an airfoil, why is it more likely to separate than a laminar boundary layer? From my research/intuition I think turbulent ...
Wyatt's user avatar
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1 vote
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How much of the Virgin GlobalFlyer's L/D is due to laminar flow?

Despite travelling much faster than the Voyager, it has a significantly higher L/D. The latter seems to have two features that disrupt laminate flow, that are absent in the former. Namely the canards ...
Abdullah is not an Amalekite's user avatar
26 votes
5 answers
5k views

Why a kite flying at 1000 feet in "figure-of-eight loops" serves to "multiply the pulling effect of the airflow" on the ship to which it is attached?

In CNN's June 30, 2023 Giant kites could pull cargo ships across the ocean – and slash their carbon emissions “What differentiates it from other wind solutions,” says Bernatets1, “is that the wing is ...
uhoh's user avatar
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2 answers
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is it necessary for the velocity distribution profile over a flat plate to have that kind of parabolic shape?

A wind tunnel boundary layer experiment was done for a flat plate with 5 stagnation probes distributed horizontally (each probe has 5 vertical sensors) and a variable flap, for 2 different free stream ...
I.ham's user avatar
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3 votes
2 answers
201 views

What technical features account for the P-51B/D's low drag relative to other fighters of the day (e.g, Spitfire Mk IX)?

I am really sorry to dredge a popular topic up again. Unfortunately, after reading through some papers on the P-51 as well as all the past forum threads I could find on this topic, I have found myself ...
interested22's user avatar
0 votes
1 answer
152 views

Effect of turbulent flow on flight [closed]

What effect does turbulent flow (let’s say over a wing) have on flight? Could I say it reduces flight performance like lift, increase drag?
Jonathan's user avatar
1 vote
1 answer
72 views

Is it expected to see transition from laminar to turbulent BL at low Reynolds numbers?

I have used XFOIL to do the following analysis: NACA0018 airfoil. Reynolds number $2\times 10^4$ (low Reynolds number). Critical Amplification factor, $N_\mathrm{crit} = 3.54$ (corresponding to a ...
Amazigh_05's user avatar
4 votes
1 answer
559 views

Why XFOIL predicts a lower drag coefficient at higher Re?

A well known idea is that for aerodynamic/streamlined bodies the friction drag is larger than pressure drag. Hence, a laminar boundary layer is preferable (only looking at minimal drag, no other ...
lWindy's user avatar
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1 vote
0 answers
45 views

Distance where transition from laminar to turbulent boundary takes place

How do we work out where the distance from the leading edge the laminar boundary layer would turn into a turbulent boundary layer? Assuming we have been given the length of the plate, speed, dynamic ...
Umer Riaz's user avatar
2 votes
1 answer
203 views

What exactly happens to kinetic energy in the turbulent layer on an aerofoil?

Sources I've read contains contradicting information. As far as I know, when the laminar airflow breaks up, it becomes a thicker and draggy layer, causing a layer of what essentially is slowed air; ...
De_'s user avatar
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3 votes
1 answer
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Is it possible that as the Reynolds number increases, a laminar bubble increases in extension?

I'm studying the Benedek 10355 airfoil (Plot), which should be a profile used in air-controlled models. While I was carrying out a boundary layer analysis, I realized the particularity that I have ...
leo95nf's user avatar
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2 votes
0 answers
77 views

Why is hybrid laminar flow control preferred for swept wings over other options?

As I understand it, a (the?) major form of laminar-to-turbulent transition on the swept wings of large jets is the crossflow caused by the sweep. One way to control this is laminar flow control by ...
Abdullah is not an Amalekite's user avatar
1 vote
0 answers
72 views

Is it true that blowing cannot be used for laminar flow control? Why?

Aerospace Engineering Desk Reference, page 505 Tangential blowing can only be applied to the prevention of separation...The flow caused by blowing tends to be very vulnerable to laminarturbulent ...
Abdullah is not an Amalekite's user avatar
0 votes
1 answer
73 views

Can the wing stagnation point be bled off and used for laminar flow control?

The stagnation point at the leading edge contains slow-moving, slightly compressed air. This sounds ideal for laminar flow control. This slow air will create little losses in ducts, and it's pressure ...
Abdullah is not an Amalekite's user avatar