抄録
The effect of the coherent structure on the pressure diffusion of the turbulent energy in a plane jet is investigated experimentally. The experiment is performed by the simultaneous multipoint measurement of two velocity components and static pressure with using the "combined probe", which consists of a probe for pressure measurement and an X-type hot-wire probe. The measured pressure and velocity data are analyzed by applying the Proper Orthogonal Decomposition (POD) and the coherent structure is specified. Further, the complementary technique of Linear Stochastic Estimation (LSE) is used to reconstruct the instantaneous pressure and velocity field of a dominant POD mode and discussed. The results show that the pressure diffusion process of the turbulent energy from outer side of the jet to the inner side is caused by the coherent vortex structure suggested in the previous studies. This means the coherent vortex structure near the jet centerline has an important role of the pressure diffusion process.
