Blade for preventing laminar separation

Details Blade for preventing laminar separation Blade for preventing laminar separation

F - Mech Eng,Light,Heat,Weapons

01

D

F01D 5/14 (2006.01) F04D 29/38 (2006.01)

Patent

CA 2649799

A blade surrounded by: a leading edge portion (11), which is where fluid (F) flows in; a pressure surface (12) which is a concave curve shape concaved along a direction the fluid (F) flows; a suction surface (13) which is a convex curve shape convexed along a direction the fluid (F) flows; and a trailing edge portion (14), which is where the fluid (F) flows out, in which a disturbance addition portion (15) is provided on the suction surface (13) closer to the leading edge portion (11) than a maximum velocity point (P), where the flow velocity of the fluid (F) is maximized on the suction surface (13), for disturbing a laminar flow on the suction surface (13) and for transitioning to a turbulent flow.

L'invention concerne une pale (10) construite en étant entourée d'un bord d'attaque (11) sur le côté vers lequel un fluide (F) s'écoule, d'une surface de pression concave (12) en retrait dans la direction de l'écoulement du fluide (F), d'une surface d'aspiration convexe (13) en saillie dans la direction de l'écoulement du fluide (F), et d'un bord de fuite (14) sur le côté en provenance duquel le fluide (F) s'écoule. Une pièce d'ajout de perturbation (15) est formée sur la surface d'aspiration (13), en une position plus proche du bord d'attaque (11) que d'un point de vitesse maximum (P) où la vitesse d'écoulement du fluide (F) est maximale sur la surface d'aspiration (13). La pièce d'ajout de perturbation (15) perturbe un écoulement laminaire sur la surface d'aspiration (13) pour amener l'écoulement à passer à un écoulement turbulent.

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