Bypass ramjet engine with heat exchanger

Claim 1

A BYPASS RAMJET PROPULSION ENGINE COMPRISING IN A FIRST SERIES FLOW PATH, A MAIN RAM AIR INLET, A COMBUSTION CHAMBER INCLUDING FUEL NOZZLES AND FLAME HOLDERS, A HEAT EXCHANGER; A BYPASS DUCT IN FLOW PARALLEL WITH SAID FIRST RAM AIR INLET, COMBUSTION CHAMBER AND HEAT EXCHANGER; SAID BYPASS DUCT DEFINING IN A SECOND SERIES FLOW PATH A SECOND RAM AIR INLET, A TRANSITION FLOW MEANS, AND SAID HEAT EXCHANGER; SAID HEAT EXCHANGER EFFECTING AN INDIRECT TRANSFER OF HEAT FROM A HIGH VELOCITY GAS FLOW FROM SAID COMBUSTION CHAMBER TO THE AIR STREAM FLOWING FROM SAID BYPASS TRANSITION DUCT; THE HEAT EXCHANGER BEING MADE UP OF A FIRST SET OF PASSAGES THROUGH WHICH THE HIGH VELOCITY BURNED GASES ARE INSENTROPICALLY EXPANDED TO SUPERSONIC VELOCITY AND A SECOND SET OF PARALLEL PASSAGES THROUGH WHICH THE BYPASS GASES FLOW AT SUBSONIC VELOCITY IN HEAT EXCHANGE RELATIONSHIP WITH THE SUPERSONIC COMBUSTION GASES; MEANS AT THE DOWNSTREAM END OF SAID SECOND SET OF PASSAGES TO EXPAND THE BYPASS GASES ISENTROPICALLY; THE COMBUSTION GAS AND BYPASS GAS BEING MIXED DOWNSTREAM OF THE HEAT EXCHANGER.