Munjal, ML and Krishnan, S and Reddy, MM (1993) Flow-Acoustic Performance of Perforated Element Mufflers With Application to Design. In: Noise Control Engineering Journal (NCEJ), 40 (1). pp. 159-167.Full text not available from this repository.
A fairly comprehensive computer program incorporating explicit expressions for the four-pole parameters of concentric-tube resonators, plug mufflers, and three-duct cross-flow perforated elements has been used for parametric studies. The parameters considered are hole diameter, the center-to-center distance between consecutive holes (which decides porosity), the incoming mean flow Mach number, the area expansion ratio, the number of partitions of chambers within a given overall shell length, and the relative lengths of these partitions or chambers, all normalized with respect to the exhaust pipe diameter. Transmission loss has been plotted as a function of a normalized frequency parameter. Additionally, the effect of the tail pipe length on insertion loss for an anechoic source has also been studied. These studies have been supplemented by empirical expressions for the normalized static pressure drop for different types of perforated-element mufflers developed from experimental observations.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to The Institute of Noise Control Engineering of the USA (INCE/USA).|
|Department/Centre:||Division of Mechanical Sciences > Mechanical Engineering|
|Date Deposited:||10 Feb 2011 05:24|
|Last Modified:||10 Feb 2011 05:24|
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