F-1512 噴流が生じている管端部からの衝撃波の放出に関する研究(S55-1 高温/高速現象と可視化(1))(S55 高速/高温現象と可視化)

概要

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It is well known that some of sources of noise which radiates from an exhaust pipe of automobile engine exist in the flow field downstream of the pipe end. An unsteady jet issues periodically from the pipe end with shock wave, so that the unsteady jet interacts with the shock wave, resulting in the formation of the complicated flow pattern. To clarify the mechanism of noise generation, the flow field downstream of the pipe end is experimentally examined using a shock tube. The flow field is visualized by shadowgraph method and different types of density waves are observed. The density wave is considered to be one of the sources of noise. The relation between the flow properties and the flow pattern of the density waves are discussed.
一般社団法人日本機械学会の論文
2001-08-22