DEVICE TO PREVENT INGRESS OF FOREIGN MATTERS INTO ENGINE Russian patent published in 2013 - IPC B64D33/02 

FIELD: transport.

SUBSTANCE: invention relates to aircraft engineering, particularly, to protective means preventing the ingress of foreign matters into aircraft engines. Protective device lower panel features relative length $$\overline{l}=\raisebox{1ex}{$l$}\!\left/ \!\raisebox{-1ex}{$D_{eqv}$}\right.=\mathrm{0,9}-\mathrm{1,05}$$ and side edges of relative height $$\overline{h}=\raisebox{1ex}{$h$}\!\left/ \!\raisebox{-1ex}{$D_{eqv}$}\right.=\mathrm{0,08}-\mathrm{0,1,}$$ relative width $$\overline{b}=\raisebox{1ex}{$b$}\!\left/ \!\raisebox{-1ex}{$D_{{}_{eqv}}$}\right.=\mathrm{0,9}-\mathrm{1,1}$$ and can displace to distance $$\overline{\lambda }=\raisebox{1ex}{$\lambda $}\!\left/ \!\raisebox{-1ex}{$D_{eqv}$}\right.$$ making 0.6-0.3 at proportional variation of relative height of air intake lower edge location from airfield surface $$\overline{H}=\raisebox{1ex}{$H$}\!\left/ \!\raisebox{-1ex}{$D_{eqv}$}\right.$$ of 0.8-1.25. Said lower panel is arranged at the angle α=15°-25° relative to air intake front edge axis where λ is lower panel extension length, m; l is length of lower panel, m; b is lower panel width, m; h is panel side edge height, m; H is height of air intake lower edge location from airfield surface, $$D_{eqv}=2\sqrt{(А*В)/\pi }$$ is equivalent diameter on inlet into air intake, m; A is air intake height, m; B is air intake width, m.

EFFECT: higher efficiency of engine protection.