Application specifics of tangential jet blow-out on the aircraft wing surface in icing conditions

Aeronautical and Space-Rocket Engineering

Aerodynamics and heat-exchange processes in flying vehicles


Аuthors

Pavlenko O. V.*, Pigusov E. A.**

Central Aerohydrodynamic Institute named after N.E. Zhukovsky, TsAGI, 1, Zhukovsky str., Zhukovsky, Moscow Region, 140180, Russia

*e-mail: olga.v.pavlenko@yandex.ru
**e-mail: evgeniy.pigusov@tsagi.ru

Abstract

Icing is one of the most dangerous environmental impacts on an aircraft. Ice bodies on the wing surfaces and empennage change their shape and contours, worsen aerodynamic characteristics, as well as increase aircraft weight. In case of icing not only the aircraft drag increases but the value of the maximum lift coefficient significantly decreases. Various anti-icing systems are employed to remove the ice that builds up in flight. However, practically all these systems have their drawbacks. Application of the wing boundary layer control (BLC) by tangential air jet blow-out on the wing upper surface is known to be one of the most effective techniques for the wing lifting properties at the takeoff-landing modes. The wing lifting properties enhancement occurs due to elimination of the flow separation on the deflected flap by the tangential blow-out of the compressed air jet and flow circulation enhancement on the wing. The hot compressed air for the BLC is drawn from the engine and then piped to the slot nozzles system to be blown-out on the wing surface.

These pipelines are similar to those of the thermal ice-protection system, usually placed along the leading edge of the wing. Thus, the BLC can be employed also to protect against the wing icing. A significant drawback of the above said technical solutions is the jet blowing slot location in an ice sticking area. It is assumed that the hot air from the engine would melt this ice at a certain time instant, but until this moment, the aerodynamic characteristics of the aircraft will degrade. In addition, water evolved while the ice melting on the leading edge, flowing down along the flow is stiffens again out of the BLC coverage forming the so-called “barrier ice”, which also deteriorates the aircraft characteristics. The presented article explores the possibility of the tangential jet blow-out on the leading edge of the wing section to reduce deleterious effect of icing. Calculations were performed employing the program based on numerical solution of Reynolds–averaged Navier-Stokes equations. A case with the horn-like ice on the wing leading edge was under consideration. Comparison of the obtained results with experimental data was performed. The article emonstrates that tangential jet blow-out under of icing conditions allows restoring aerodynamic characteristics level to prior-to-icing state, including coefficients of lift and pitching moment. Specifics of spatial flow-around of the wing section in icing conditions when employing tangential jet blowing-out are presented.

Keywords:

aircraft icing, leading edge icing, horn-like ice imitator, wing lift force, tangential jet blowing-out, wing boundary layer control, anti-icing aircraft system

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