The Noise Elimination Capability Of Diffusive Silencer And It's Air Flow Filed Analysis

In this paper, it is combined that designing principle of diffusor and controlling noise theory of muffler. According to the base, the theoretic analysis and experimentation were studied. In theory, theoretical analysis is applied to analyze the affect about velocity distribution of the diffusive silencer by airflow and the affect about pressure loss. At the theoretical aspect, from the analysis of internal flow field in mufflers, the finite element analysis software is suitable for numerical simulation to get the velocity distribution of airflow inner flow field in dissipative silencer.At the experimental aspect, according to the national standard of the People' Republic of China muffler model, experimental situation and steps are designed to test the silencer for measure, we get the volume of noise elimination of dB(A) and the volume each spectrum of noise elimination of tubular diffusive silencer under the different air velocities and different punching rates. Finally, according to the theoretical analysis and experimental data, we get or verify some valuable conclusions in the diffusive silencer...