Abstract
The 600 acoustic watt siren to provide either pure tone or warble tone sound in the frequency range of 1000 to 4000 Hz was designed on the basis of a lumped parameter analytical model using electrical analogies of the acoustical elements. The pressure source, rotor and stator ports, the exponential horn, and the agglomeration chamber are represented. The time varying nature of the porting arrangement is recognized. The power output of the siren as a function of frequency (siren speed), supply pressure and air flow agrees well with the predicted values. Acoustic efficiencies ranging from 25% to 33% were attained. Since axial clearances between rotor and stator were the limiting factors larger sirens contemplated for industrial use are expected to provide higher efficiencies. Thus, overall efficiencies including the compressed air supply system in the vicinity of 27% appear feasible. The siren has operated without breakdown for about 1000 hours.
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