METHOD FOR OPERATION OF FREE-PISTON GAS GENERATOR AND APPARATUS FOR IMPLEMENTATION THEREOF Russian patent published in 2022 - IPC F02B71/04 

FIELD: engine building.

SUBSTANCE: method for operation of a free-piston gas generator (FPGG) and apparatuses for implementation thereof relate to engine building, in particular, to free-piston gas generators. In the first variant, a two-stroke FPGG operating on gasoline comprises two compression cavities and two alternately working combustion chambers in the cylinder. During the working stroke, gases spent in the previous working stroke are pumped into the turbine from the opposite combustion chamber. At the end of the working stroke, the residual spent gases are removed by blowing the combustion chamber, the chamber is filled to a predetermined pressure with compressed air, and after injecting fuel, another working stroke is executed. In the second variant, a two-stroke FPGG operating on an expanded range of fuels comprises a lockable pre-chamber next to each combustion chamber. During the working stroke in the first combustion chamber, gases spent in the previous working stroke are pumped into the turbine from the second combustion chamber. At the end of the working stroke, the residual spent gases are removed by blowing the first pre-chamber together with the combustion chamber, the pre-chamber is filled to a predetermined pressure with compressed air, and the air is held. A working stroke is executed in the second pre-chamber, prior to the completion whereof fuel is injected into the first pre-chamber, and after the ignition and necessary holding whereof, another working stroke is executed. Increased pressure and temperature are obtained by pumping the spent gases into the turbine. The operation of the gas generator on an expanded range of fuels is achieved by pumping a predetermined amount of air into a closed pre-chamber and by holding the burning mixture prior to the beginning of the working stroke.

EFFECT: development of a method for generating gases with increased pressure and temperature necessary to increase the efficiency of the turbine, and development of variants of FPGG operating according to the proposed method.

4 cl, 12 dwg