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ISSN Онлайн: 2642-0554

SIMULTANEOUS MEASUREMENTS OF ENERGY AND TEMPERATURE DISSIPATION RATES IN THE FAR FIELD OF A CYLINDER WAKE

Zhiyong Hao
School of Mechanical and Production Engineering Nanyang Technological University, Singapore 639798

Tongming Zhou
School of Civil and Resource Engineering, The University of Western Australia 35 Stirling Highway, Crawley, WA6009, Western Australia, Australia

Leok Poh Chua
School of Mechanical and Production Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798

Yi Tsann Jiang
DSO National Laboratories 20 Science Park Drive, Singapore 118230

Аннотация

Simultaneous approximations to energy and temperature dissipation rates, denoted as εap and χap, are obtained using a probe consisting of four hot wires and a pair of parallel cold wires. The performance of the probe in measuring velocity and temperature derivatives and vorticity has been checked satisfactorily by comparing with isotropic calculations. Local isotropy of small-scale turbulent structures is checked. The differences between the present approximations of the two dissipation rates and those obtained by using isotropic relations are also discussed in terms of both their corresponding spectra and the correlation coefficients with respect to different longitudinal separations r. The correlations between the two dissipation fields and the enstrophy are also examined. Whereas εap is strongly correlated with ω32, the correlation between ω32 and χap is small.