Abstract
The sound radiated by orifices in pipelines is studied analytically and experimentally. At Mach numbers less than about 0.1, the sound is generated as from a simple source by mass flow fluctuations that are caused by the shedding of vortices from the orifice edge. The spectrum of sound energy has peaks in it, indicating a tonal quality of the noise. At higher Mach numbers, the sound is of a dipole nature, has a wide frequency base, and can be evaluated by considering the fluctuating force exerted by the orifice plate on the jet. Sound generation by multiple orifices in a single-orifice plate is also studied. Two cases are dealt with. First, the number of orifices of a constant diameter is increased and, second, the number of orifices is increased, maintaining a constant total area. Preliminary experiments verify the theoretical relationships for single and multiple orifices. The results are presented in the form of dimensionless spectral-density distributions versus the Strouhal number. [Work sponsored by the U. S. Department of the Navy, Bureau of Ships, contract No. NObs-88200.]
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
