Show A Singing Flame J May lay End Air Jets Jets' Whine n A Singing Flame may put an end to the whining sound of the airplane jet engine if the experiments are successful at atthe atthe atthe the College of Engineering Pennsylvania State University Mechanical engineer Gerhard Gerhard Gerhard Ger Ger- hard is searching for foran foran foran an efficient economical method of reducing the loud whine of jet fan-jet engines His premise is that if a pure tone could be generated in a jet engines engine's hot exhaust gases and if that sound could be pitched exactly out of phase with the fan-blade fan noise the two will cancel Preliminary research has shown that an oscillating electric field acting on the boundary of the hot part of an oxy-acetylene oxy flame does result in the generation of sound at the frequency of the imposed electric field In fact it was even possible to transmit music with considerable considerable considerable consider consider- able fidelity hence the term ring flame |