ON-BOARD DEVICE OF ENGINE PROTECTION AGAINST INGRESS OF FOREIGN MATTERS Russian patent published in 2015 - IPC B64D33/02 F02C7/05 

FIELD: process engineering.

SUBSTANCE: invention relates to aircraft engineering, particularly, to protection of aircraft engines against the ingress of foreign matters. Lower panel features relative length $$\overline{l}=\raisebox{1ex}{$l$}\!\left/ \!\raisebox{-1ex}{$D_{EQ}$}\right.=0,9-1,05,$$ relative width $$\overline{b}=\raisebox{1ex}{$b$}\!\left/ \!\raisebox{-1ex}{$D_{EQ}$}\right.=0,9-1,1$$ and can displace through relative length $$\overline{\lambda }=\raisebox{1ex}{$\lambda $}\!\left/ \!\raisebox{-1ex}{$D_{EQ}$}\right.$$ equal to 0.6-0.3 at proportional variation of relative height of air intake location from airfield surface $$\overline{H}=\raisebox{1ex}{$H$}\!\left/ \!\raisebox{-1ex}{$D_{EQ}$}\right.$$ of 0.8-1.25.Lower panel is arranged at α=15°-35° relative to air intake front edge and has small panel at its rear located at relative length $$\overline{с}=с/l=0,2-0,3$$ to reciprocate at the period of oscillation T=2.0-5.0 s, where λ is panel extension length, m; l is bottom panel length, m; b is bottom panel width, m; c is small panel length, m; H is location height of air intake lower edge from airfield surface, m; $$D_{EQ}=2\sqrt{(A*B)/\pi }$$ 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