Radiation of finite-amplitude waves from a baffled pipe

Abstract

The radiation of finite-amplitude waves from the open end of a baffled, circular pipe is considered as a direct continuation of work begun by Blackstock and Wright more than three decades ago [Kuhn et al., J. Acoust. Soc. Am. 63, (1978), S1, S84]. Band-limited Gaussian noise, as well as 1, 1.5, and 2 kHz sinusoidal pulses, with initial sound pressure levels ranging from 552 to 1186 Pa, have been propagated down a 6.1 m pipe, whose open end (5.1 cm inner diameter) has been placed off-center in a large rectangular baffle. As the steepened or shock-like waves exit the pipe, the measured waveforms are comprised of sharp impulses that are delta function-like in nature, particularly on axis. Although linear piston theory predicts similar waveform shapes, there is also evidence that nonlinear propagation of these impulses, which can exceed 150 Pa near the pipe opening, is occurring. http://asadl.org/jasa/resource/1/jasman/v63/iS1/pS84_s5