DEVICE TO PROTECT ANGINE AGAINST INGRESS OF FOREIGN OBJECTS 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. Proposed device comprises lower panel of relative length $$\overline{\text{l}}=\raisebox{1ex}{$\text{l}$}\!\left/ \!\raisebox{-1ex}{${\text{D}}_{\text{eqv}}$}\right.=\text{0}\text{,9}-\text{1}\text{,05}$$ and relative width $$\overline{\text{b}}=\raisebox{1ex}{$\text{b}$}\!\left/ \!\raisebox{-1ex}{${\text{D}}_{\text{eqv}}$}\right.=\text{0}\text{,9}-\text{1}\text{,1}\text{.}$$ Said panel tail is furnished with flap of relative length $$\overline{c}=c/l=\mathrm{0,2}-\mathrm{0,4.}$$ Said panel can extend for relative length $$\overline{\text{λ}}=\raisebox{1ex}{$\text{λ}$}\!\left/ \!\raisebox{-1ex}{${\text{D}}_{\text{eqv}}$}\right.$$ making 0.6-0.3 at proportional change in air intake lower edge position above airfield surface $$\overline{\text{H}}=\raisebox{1ex}{$\text{H}$}\!\left/ \!\raisebox{-1ex}{${\text{D}}_{\text{eqv}}$}\right.$$ making 0.8-1.25. Lower panel flap oscillates through the angle α_L=25°-30° relative to air intake face edge with oscillation period T= 1.0-4.0 s, where λ is panel extension, m; l is lower panel length, m; b is lower panel width, m; c is lower panel flap length, m; H is air intake lower edge position above airfield surface, m; $${\text{D}}_{\text{eqv}}=\text{2}\sqrt{\left(\text{A*B}\right)\text{/π}}$$ is equivalent diameter of air intake inlet, m; A is air intake height, m; B is air intake width, m.

EFFECT: higher efficiency of protection.

3 dwg