43 Design of Reactive Mufflers Teruo Obata

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Teikyo University

43.1 Introduction ........................................................................ 43-1

43.2 Fundamental Equations ...................................................... 43-2

Analytical Model † Boundary Conditions

43.3 Effects of Reactive Mufflers ................................................ 43-3

Insertion Loss † Transmission Loss

43.4 Calculation Procedure ........................................................ 43-5

43.5 Application Range of Model .............................................. 43-6

Condition for Approximation of Plane Wave † Effect of

Temperature † Effect of Gas Flow in Pipe † Effect of

Friction Loss in Pipe

43.6 Practical Example ................................................................ 43-13

Expansion-Type Muffler for Reciprocating Compressor

Summary

This chapter concerns the design of noise suppression devices such as mufflers. In particular, reactive mufflers that

are inserted into long ducts are considered in detail. Analytical and empirical equations and information that are

useful in the modeling and analysis of mufflers are presented, with an indication of their application ranges and

limitations. A design procedure, complete with the necessary computations, is given. Methodologies and parameters

of the performance analysis of acoustic systems with mufflers are indicated. An illustrative example of a muffler for a

double-acting reciprocating compressor is presented.

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