HIGH-ALTITUDE LAVAL NOZZLE Russian patent published in 2008 - IPC F02K1/36 

FIELD: engines.

SUBSTANCE: high-altitude Laval nozzle consists of round nozzle and round high-altitude attachment installed in alignment to the round nozzle. Nozzle and attachment are inter-connected forming an annular slot. The high-altitude attachment is located in the first or the last additional gas blowing collector. Additional gas blowing collector has outlet pipes with jets installed inside. The annular slot has a dividing plate; holes in the form of slots are made around the perimeter of this plate. Height of annular slot is h_s = (0.2-0.4)r_cr, where r_cr is a radius of critical cross-section of round nozzle. Radius at the round nozzle cut is r_a= (3-7) r_cr. Jets have an outlet section area which allows additional gas blowing at the flow rate not more than 5%.

EFFECT: enhancement of path-mean specific pulse of aircraft propulsion device.

5 cl, 9 dwg