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Flow Characteristics Inside Circular Injection Holes Normally Oriented to a Crossflow: Part II — Three Dimensional Flow Data and Aerodynamic Loss

[+] Author Affiliations
Sang Woo Lee, Seong Kuk Joo

Kumoh National University of Technology, Kumi, Kyungbook, Korea

Joon Sik Lee

Seoul National University, Seoul, Korea

Paper No. 2000-GT-0257, pp. V003T01A063; 9 pages
doi:10.1115/2000-GT-0257
From:
  • ASME Turbo Expo 2000: Power for Land, Sea, and Air
  • Volume 3: Heat Transfer; Electric Power; Industrial and Cogeneration
  • Munich, Germany, May 8–11, 2000
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7856-9
  • Copyright © 2000 by ASME

abstract

Presented are three-dimensional mean velocity components and aerodynamic loss data inside circular injection holes. The holes are normally oriented to a crossflow and each hole has a sharp square-edged inlet. Because of their importance to flow behavior, three different blowing ratios of M = 0.5, 1.0 and 2.0, and the hole length-to-diameter ratios of L/D = 0.5, 1.0 and 2.0 are investigated. The entry flow is characterized by a separation bubble, meanwhile the exit flow by the direct interaction with the crossflow. The uniform on-coming flow at the inlet undergoes a strong acceleration and a subsequent gradual deceleration along a converging-diverging flow passage formed by the inlet separation bubble. After passing the throat of the converging-diverging passage, the potential-core flow which is nearly axisymmetric decelerates on the windward side, but tends to accelerate on the leeward side. The presence of the crossflow thus reduces the discharge of the injectant on the windward side, but enhances its efflux on the leeward side. This trend is greatly accentuated at M = 0.5. In general, there are strong secondary flows in the inlet and exit planes of the injection hole. The secondary flow within the injection hole, on the other hand, is found relatively weak. The inlet secondary flow is characterized by a strong inward flow toward the injection-hole center. However, it is not completely directed inward since the crossflow effect is superimposed on it. Past the throat, the secondary flow is observed such that the leeward velocity component induced by the crossflow is superimposed on the diverging flow. Short L/D usually results in the exit discharging flow with a steep velocity gradient as well as a strong deceleration on the windward side, as low M does. The aerodynamic loss inside the injection hole is originated from the inlet separation bubble, wall friction and interaction of the injectant with the crossflow. The first one is considered as the most dominant source of loss, even in the case of L/D = 2.0. At L/D = 0.5, the first and third sources are strongly coupled with each other. Regardless of L/D, the mass-averaged aerodynamic loss coefficient has an increasing tendency with increasing M.

Copyright © 2000 by ASME
Topics: Flow (Dynamics)

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