METHOD OF AND SYSTEM FOR PURGING OF LAUNCH-VEHICLE ENGINES Russian patent published in 2006 - IPC F02K9/00 B64G5/00 

FIELD: rocketry.

SUBSTANCE: invention relates to methods and devices to control rocket engine power units. According to proposed method, when preparing launchivehicle for launching, after filling of launch-vehicle with fuel components, preparatory purgings of board filling devices and fuel lines of engine plants are carried out by air, and main purgings of tail compartments and fuel lines of engine plant are carried out by nitrogen. In case of failures in engines before "lift-off contact" command, off-standard purgings of tail compartments and engine plants through lines of fuel and oxidizer are carried out. Then again preparatory and main purgings are carried out. If troubles are detected again, off-standard purgings are carried out in turn, purging of board filling devices and engine plant oxidizer line are carried out with air and main purging is done. In case of combustion in separate units of engines, purging with nitrogen of tail compartments and engine plants through oxidizer line is carried out. Proposed system contains cylinders with compressed nitrogen and air, nitrogen and air manifolds with shutoff valves and pipelines to supply gas to units. Shutoff devices are essentially two series-connected pneumatic valves. Jets are installed in manifolds between shutoff valves and check valves. Nitrogen manifolds are interconnected by means of pneumatic valve and check valve in points between shutoff valves. Air manifold is connected with nitrogen manifold in points between check valves and pipelines to deliver gas to units.

EFFECT: provision of possibility of repeated starting of engines of launch-vehicles in case of troubles revealed at standard operations on ground launching complexes.

3 cl, 2 dwg