Large eddy simulation of inclined round jet issuing into cross-flow

Eiji Sakai, Toshihiko Takahashi, Hiroaki Watanabe

Research output: Contribution to journalArticle

Abstract

For understanding of film cooling flow fields on a gas turbine blade, this paper reports on a series of large-eddy simulations of an inclined round jet issuing into a crossflow. Simulations were performed at four blowing ratio conditions, BR=0.1, 0.5, 0.7 and 1.0 and Reynolds number, Re=15,300, based on crossflow velocity and film cooling hole diameter. Results showed that cooling jet flow structure drastically changed with blowing ratio. A pair of rear vortex and hairpin vortex were observed for BR=0.1. Aperiodic ejection of horseshoe vortex, a pair of hanging vortex, a pair of rear vortex and hairpin vortex were observed for BR=0.5. Similar vortical structures to BR=0.5 were observed for BR=0.7 although horseshoe vortex remained at a leading edge of the hole exit. For BR=1.0, in addition to the former mentioned vortices, spanwise rollers and vertical streaks were observed on an upstream edge of the jet. It was, consequently understood that the ubiquitous counter-rotating vortex pair which can be defined in the time-averaged flow field was actually originated in the different vortical structures with varying BR conditions.

Original languageEnglish
Pages (from-to)1107-1117
Number of pages11
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Volume78
Issue number789
DOIs
Publication statusPublished - Jun 15 2012
Externally publishedYes

Fingerprint

cross flow
Large eddy simulation
large eddy simulation
Vortex flow
horseshoe vortices
vortices
film cooling
blowing
flow distribution
Blow molding
Cooling
cooling
Flow fields
turbine blades
rollers
jet flow
gas turbines
leading edges
ejection
upstream

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Large eddy simulation of inclined round jet issuing into cross-flow. / Sakai, Eiji; Takahashi, Toshihiko; Watanabe, Hiroaki.

In: Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Vol. 78, No. 789, 15.06.2012, p. 1107-1117.

Research output: Contribution to journalArticle

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