: A few operation examples of combustion system with semi open combustion chamber for spark ignitron engines has been presented in this paper. This system has been designed in Aircraft Engine Department of Heat Engineering Institute of Warsaw University of Technology. The principal problem of operation this system is to assure that jet-stream commences to outflow from prechamber to main combustion chamber when the piston is at TDC and that it will have a sufficient energy quickly to displace all main chamber. This is a task for combustion control system. This can be obtained by correct selection of the system operating parameters: the volume ratio of prechamber to total combustion chamber, the hole diameter in partition, the igniter locations, the ignition advance angle. If this system has operate correctly it was obtained the shortening of combustion time about 2.2 time, growth of maximum cycle pressure 1.9 time and increase of combustion efficiency 1.4 time, in comparison to standard combustion chamber. This research results concern the test conducted using rapid compression machine.
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