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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

NUMERICAL STUDY OF DROPLET-LADEN MIST FILM COOLING EFFECTIVENESS OF CYLINDRICAL HOLES EMBEDDED IN A TRANSVERSE TRENCHE

Get access (open in a dialog) DOI: 10.1615/IHTC16.mpf.022131
pages 6403-6408

摘要

The film cooling performance of cylindrical holes embedded into a transverse trench is numerically studied for both single-phase and mist flows. The simulations are performed with the set of 3D RANS equations. Gas turbulence is simulated using the elliptic Reynolds stress model. The thermal effectiveness of film cooling at blowing the near-wall film cooling through holes embedded into the trench exceeds the corresponding value for blowing without the trench by the factor of up to 2.5 at a small distance from the point of blowing. With a distance from the blowing point, the difference decreases and at x/d ≥ 30 it does not exceed 20%. When using the blowing embedded into the trench, the effectiveness of film cooling increases in the whole studied range of blowing parameter 0.5−2. In transverse direction, the value of thermal effectiveness is considerably higher (up to 90%) than the corresponding value for blowing without the trench. The good agreement between measurement results and current simulations is obtained.