... by 36 dB at a 135 deg observer angle, reflecting the rectification effect of the duct on the nonuniform inlet flow and the improvement in characteristics of the noise source. The proper orthogonal decomposition (POD) of the static pressure field on the blades verified that the main spatial mode is more...

... the proper orthogonal decomposition (POD) method as well. The discussion of the circumferential modes from aerodynamic noise of an axial flow cooling fan can act as a reference for further cooling fan noise reduction measures. e-mail:  mj_tian@sjtu.edu.cn e-mail:  szhdjaccount@sjtu.edu.cn e...

... structures, enhance mixing, and hence, promote the most appropriate conditions for coherent structures' suppression. e-mail:  madjid.birouk@umanitoba.ca 19 02 2019 04 10 2019 29 01 2020 partially premixed flames POD coherent structures fuel nozzle geometry swirl...

... (POD) and extended-POD, were used to extract the energetic pressure fluctuations and dominant vortex structures of the control valve. To this end, the typical annular attachment flow inside a steam turbine control valve was investigated by carrying out a detached eddy simulation (DES). Thereafter...

...Wenjin Qin; Maozhao Xie; Ming Jia; Tianyou Wang; Daming Liu Fig. 20 Velocity field at 270 °CA ATDC The POD method has been used to process and analyze the in-cylinder turbulence flow database (including LES simulation and PIV measurement) in a four-valve DISI engine. In order...

... f ≈ 0.92 ) and two higher frequencies ( St f ≈ 1.3 and 1.55) that are not harmonically related to the natural frequency. Phase-averaged measurement are used as a first step to visualize the coherent flow structures. Second, proper orthogonal decomposition (POD) is applied to the PIV data...