Abstract
To explain the mechanism of sound generated by flow field, this paper proposes an equation of acoustic energy conservation which consists in general flow field. The equation of conservation expresses law of acoustic energy conversions. From this equation, it bacame clear that following things generate or dissipate sound. (1) propagation (2) work by viscosity (3) interaction between pressure and heat variation (4) work generated by heterogeneous of mean flow velocity (5) high degree action generated by turbulent perturbation (6) dissipation accompanied by thermal expansion (7) dissipation accompanied by pressure loss (8) interaction between pressure loss and propagation of sound (9) action by non linerity of low degree sound. This conversion law and incompressible numerical simulation will make clear mechanism of sound generation.
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