PRE-COMPRESSING APPARATUS FOR INTERNAL COMBUSTION ENGINES

摘要

This invention relates to apparatus that compresses the combustion air, or the air-fuel mixture, prior to being admitted to the combustion chambers of internal combustion engines. The invention is applicable to engines having multiple combustion chambers. The pre-compression is currently practised as an option in piston-type engines by means of supercharging compressors; whereas in dual-shaft gas turbines - being indispensable - it is achieved by the gasifier charging compressors. Both types of compressors are driven by turbines utilizing a partial expansion of the whole volume of burnt gases produced in the engine. The main feature of the invention is that only a fraction of the total volume of produced burnt gases is employed in the driving turbines. In a given multicylinder engine, said fraction is delivered as active exhaust gases - through a separate exhaust system - by a selected number of cylinders from the engine's set of cylinders. The active condition of the gases is achieved by suitable adjustments of the mechanism commanding the operation of the selected cylinders. In the remaining cylinders, the combustion products undergo a feasibly complete expansion. Likewise in a dualshaft gas turbine the fraction of burnt gases delivered to the gasifier turbine as working substance, is obtained from a selected number of combustors, from the engine's combustors set. The burnt gases from the remaining combustors are fed to the power turbine to produce the power output. The implementation of the invention will result in: an economical use of the thermal energy developed by the combustion of the fuel, a better control of the pre-compressing apparatus, and a reduced size of the driving turbines that will handle a diminished volume of working substance.