Boundary layer control refers to methods of controlling the behaviour of fluid flow boundary layers. It may be desirable to reduce flow separation on fast vehicles to reduce the size of the wake (streamlining), which may reduce drag. Boundary layer separation is generally undesirable in aircraft high lift coefficient systems and jet engine intakes. Laminar flow produces less skin friction than turbulent but a turbulent boundary layer transfers heat better. Turbulent boundary layers are more resistant to separation.
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| - Boundary layer control (en)
- Controllo dello strato limite (it)
- 境界層制御 (ja)
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| - In fluidodinamica, con controllo dello strato limite (o BLC, dall'inglese Boundary Layer Control) si indicano una serie di metodologie atte a prevenire o ritardare il distacco dello strato limite di un fluido che scorre lungo una parete. È di particolare interesse per l'ingegneria aeronautica in quanto permette di ridurre la resistenza di un profilo alare aumentandone al contempo la portanza, ottenendo caratteristiche STOL senza penalizzare il comportamento alla velocità di crociera. (it)
- 航空宇宙工学における 境界層制御（きょうかいそうせいぎょ、英: Boundary layer control、BLC）は、航空機の主翼の境界層を制御する複数の手法を意味する。層流境界層維持が目的時には、層流制御 (Laminar flow control,LFC) とも呼ばれる。 揚抗比を保ち高い迎角でも低速時のを向上させる。同規模の機体に比べ境界層制御を備えた機体は短距離離着陸能力や高速巡航における飛行特性が大幅に向上する。 境界層制御を使用する航空機の例として日本の新明和PS-1・US-1・US-2飛行艇がある。これらの大型4発機は、境界層制御専用のエンジンで圧縮した空気を翼上面に吹き出して層流を作り出すことによって境界層剥離を防ぐ境界層制御を行なっており、高い短距離離着陸能力を備えている。 STOL実験機飛鳥でも試験された。 (ja)
- Boundary layer control refers to methods of controlling the behaviour of fluid flow boundary layers. It may be desirable to reduce flow separation on fast vehicles to reduce the size of the wake (streamlining), which may reduce drag. Boundary layer separation is generally undesirable in aircraft high lift coefficient systems and jet engine intakes. Laminar flow produces less skin friction than turbulent but a turbulent boundary layer transfers heat better. Turbulent boundary layers are more resistant to separation. (en)
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| - Boundary layer control refers to methods of controlling the behaviour of fluid flow boundary layers. It may be desirable to reduce flow separation on fast vehicles to reduce the size of the wake (streamlining), which may reduce drag. Boundary layer separation is generally undesirable in aircraft high lift coefficient systems and jet engine intakes. Laminar flow produces less skin friction than turbulent but a turbulent boundary layer transfers heat better. Turbulent boundary layers are more resistant to separation. The energy in a boundary layer may need to be increased to keep it attached to its surface. Fresh air can be introduced through slots or mixed in from above. The low momentum layer at the surface can be sucked away through a perforated surface or bled away when it is in a high pressure duct. It can be scooped off completely by a diverter or internal bleed ducting. Its energy can be increased above that of the free stream by introducing high velocity air. (en)
- In fluidodinamica, con controllo dello strato limite (o BLC, dall'inglese Boundary Layer Control) si indicano una serie di metodologie atte a prevenire o ritardare il distacco dello strato limite di un fluido che scorre lungo una parete. È di particolare interesse per l'ingegneria aeronautica in quanto permette di ridurre la resistenza di un profilo alare aumentandone al contempo la portanza, ottenendo caratteristiche STOL senza penalizzare il comportamento alla velocità di crociera. (it)
- 航空宇宙工学における 境界層制御（きょうかいそうせいぎょ、英: Boundary layer control、BLC）は、航空機の主翼の境界層を制御する複数の手法を意味する。層流境界層維持が目的時には、層流制御 (Laminar flow control,LFC) とも呼ばれる。 揚抗比を保ち高い迎角でも低速時のを向上させる。同規模の機体に比べ境界層制御を備えた機体は短距離離着陸能力や高速巡航における飛行特性が大幅に向上する。 境界層制御を使用する航空機の例として日本の新明和PS-1・US-1・US-2飛行艇がある。これらの大型4発機は、境界層制御専用のエンジンで圧縮した空気を翼上面に吹き出して層流を作り出すことによって境界層剥離を防ぐ境界層制御を行なっており、高い短距離離着陸能力を備えている。 STOL実験機飛鳥でも試験された。 (ja)
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