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- 저자 : Liuliu Shi (검색결과 2 건)
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Shi Liuliu,Yao Shichuan,Xuan Liming,Dai Ren 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.5
The influence of the velocity ratio (VR) between the jet and main flow on the wake structure and aerodynamic loss of the trailing edge jet is studied using particle image velocimetry and numerical simulations. Three different velocity ratios, namely, VR = 0.5, 1.0, 1.5, are chosen for this comparative study. The Reynolds number (Re h ) based on the slot height (h) and the mainstream velocity (U 0 ) are 3380. Results show that the influence of jet on wake structure is significant such that the wake region shrinks and the turbulent kinetic energy is enhanced as the velocity ratio increases. The distribution area of strong vorticity is enlarged with increasing velocity ratio. By using proper orthogonal decomposition and fast Fourier transfer analysis, the variation of velocity ratio demonstrates significant impact on vortex shedding and turbulent kinetic energy. The aerodynamic loss coefficient is nearly constant between VR = 0.5 and 1.0, but increases by 3.25 % as the velocity ratio increases from 1.0 to 1.5.
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Liuliu Shi,Geer Yang,Shichuan Yao 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.6
The unsteady flow past a square cylinder with rounded leading corners is predicted at Re = 2600 by large eddy simulations (LES). The corner radius r is fixed at 3 mm and the cylinder width D is 12.7 mm, resulting in r / D = 0.236. Detailed comparisons are made between the two-dimensional (2D) and the three-dimensional (3D) results with previous experimental measurements [32, 33]. The results show that the Strouhal number agrees well with previous measurement [33], indicating that both 2D and 3D LES are capable of capturing the shedding of large-scale vortical strutures. The statistical quantities (e.g., the drag and lift coefficients, the time-averaged streamwise velocity, the root-mean-square of streamwise velocity and the Reynolds stress) were calculated and validated against experimental results [32, 33]. The 3D LES results show reasonable agreement with the experimental measurement [32, 33], while the results predicted by 2D LES deviate far from the experimental measurement [32, 33]. It is further demonstrated that the recirculation length and the vortex formation length are consistent with experimental results [33], while it is greatly shortened in 2D LES.
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