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THE OUTFLOW OF AIR FROM POROUS MATERIALS AND THE NOISE REDUCTION THEORY OF POROUS DIFFUSER

MA Dα-YOU LI PEI-ZI DAI GEN-HUA WANG HONG-YU

THE OUTFLOW OF AIR FROM POROUS MATERIALS AND THE NOISE REDUCTION THEORY OF POROUS DIFFUSER

MA Dα-YOU, LI PEI-ZI, DAI GEN-HUA, WANG HONG-YU
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  • Received Date:  30 January 1978
  • Published Online:  05 March 1978

THE OUTFLOW OF AIR FROM POROUS MATERIALS AND THE NOISE REDUCTION THEORY OF POROUS DIFFUSER

  • 1. 中国科学院物理研究所

Abstract: Porous diffusers, a distinguished group of silencers, have been developed in the last years, and are used widely in foreign countries. They are preeminent in their small volume, simple structure and high noise reduction. Unfortunately, there are lack of theoretical discussions as yet. In this work, the aerodynamics of flow through porous materials is discused in detail and the authors suggest that the outflow through porous material can be characterized by an effective area and an effective stagnation pressure reduction. Furthermore, the principle of noise reduction of porous diffusers has been studied in some detail, to facilitate the design and the estimation of porous diffusers. Some of the porous diffusers are studied in the light of the present theory.

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