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Experimental Investigation of Flow and Heat Transfer for Single and Multiple Rows of Circular Jets Impinging on a Concave Surface

[+] Author Affiliations
B. V. N. Rama Kumar

Honeywell Technology Solutions Pvt. Ltd., Bangalore, India

B. V. S. S. S. Prasad

Indian Institute of Technology - Madras, Chennai, India

Paper No. GT2008-51044, pp. 921-929; 9 pages
doi:10.1115/GT2008-51044
From:
  • ASME Turbo Expo 2008: Power for Land, Sea, and Air
  • Volume 4: Heat Transfer, Parts A and B
  • Berlin, Germany, June 9–13, 2008
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4314-7 | eISBN: 0-7918-3824-2
  • Copyright © 2008 by ASME

abstract

Flow and heat transfer characteristics for single and multiple rows of circular jets impinging on a concave surface are investigated experimentally. The dimensions of the concave target plate, impingement tube, orifice diameter, intra jet spacing are so selected that the present system represents a scaled-up (30:1) model for the leading edge of a typical gas turbine nozzle guide vane. The target plate is kept at a distance of one orifice diameter from the impingement tube, whilst the ratio of inter-jet distance to jet diameter is maintained at a value of 5.4. The parameters which are varied in the study include jet Reynolds number (Red = 2847–19300) and number of rows (nR = 1 and 5).The local dimensionless pressure and Nusselt number variations along the concave plate are presented at these parameters. A performance number named Thermo Hydrodynamic Performance Ratio (THPR) is introduced to evaluate different configurations on the basis of a combined pressure drop and heat transfer. Usage of multiple jets appears to offer much better THPR than that of single jet or single row of jets, for a chosen plenum condition.

Copyright © 2008 by ASME

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