Talk:Dynamic stall on helicopter rotors

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Reviews

Is it possible to draw some connections between the dynamic stall on helicopter rotors and the one on vertical axis wind turbine? the reason for this question is that maybe it can be more intuitive to understand the problem starting from a wind turbine perspective.

I think that a start from the static stall and the description of the difference between dynamic stall and static one would be more helpful to understand (something which is quite deep in the aerodynamic field), instead the concept of static stall is taken from granted.

Are there any CFD calculation where in fact someone computed the drop of performance due to dynamic stall? what are the results?

I would add a lot of wikilinks to sentences like this: the unsteadiness of the flow resulting from circulation that is shed into the wake at the trailing edge of the airfoil causes a reduction in the lift and adverse pressure gradients compared to the steady case at the same AoA. in order to link to various concepts (trailing edge, lift, circulation, etc...). are the results of the two semi-empirical model coherent ? do they differ?--Ettore morosini (talk) 13:35, 18 June 2021 (UTC)[reply]

@Ettore morosini: Thank you for your insightful comments.

In fact, I did not know dynamic stall can occur on wind turbine blades before... But in this article, the dynamic stall behaviour of basic 2-D airfoils is explained, the theory of which should be same as that of wind turbine. I think maybe another page aiming at this problem should be created. But it is a good perspective to compare the difference.
Yes, it is. But there is already another wiki page on the general stall or the static stall. I think it is better to link this page to the word "stall" in a proper location in the article. Just like other concepts you mentioned.
I have missed some research results for the CFD calculation and semi-empirical models. To be honest this topic is not really the research project I am working on so I am not that familiar with it, and in this limited time I didn't cover all the aspects. I will refine it later.

— Preceding unsigned comment added by HybridCFD (talk • contribs) 16:55, 18 June 2021 (UTC)[reply]

Another comment

This great article gives readers (who are supposed to be laymen) a throughout introduction of dynamic stall on helicopter rotors. It is well-organized and contains lots of figures. --Zheeeng (talk) 13:58, 18 June 2021 (UTC)[reply]

@Zheeeng: Thank you! — Preceding unsigned comment added by HybridCFD (talk • contribs) 16:56, 18 June 2021 (UTC)[reply]

Another comment

You provide a good explanation, well-referenced and illustrated. Good job! I only have an observation on the use of the article before "stall":

You start with "the" dynamic stall
then you use only: stall.

Is there missing an article? maybe "the" or "a" before the word. I didn't change it as I am not aware of the technical language. --Luthienrecanto (talk) 14:57, 18 June 2021 (UTC)[reply]

@Luthienrecanto: Thank you for your comments. I apology for the inconvience of reading. Here is the point: if the stall is not specified in the content, it denotes the dynamic stall, otherwise it's the general stall. — Preceding unsigned comment added by HybridCFD (talk • contribs) 16:30, 18 June 2021 (UTC)[reply]

Observations and suggestions for improvements

The following observations and suggestions for improvements were collected, following expert review of the article within the Science, Tecnology, Society and Wikipedia course at the Politecnico di Milano, in June 2021.

1.Figure on the Effect of airfoil geometry on dynamic stall should be rotated.

2.The Leishman Beddos model equations are missing and could be added to improve the quality of the article.

Ettmajor (talk) 10:43, 11 July 2021 (UTC)[reply]