Advertisement

Flapping Motion of a Turbulent Jet Under the Asymmetric Excitation of Two Unsteady Minijets

  • H. Yang
  • Y. ZhouEmail author
  • Y. Zhu
  • Y. Liu
Conference paper
Part of the Lecture Notes in Mechanical Engineering book series (LNME)

Abstract

The control of a turbulent round jet is experimentally investigated based on the injection of two radial minijets, separated azimuthally by an angle θ = 60º, prior to the issue of the main jet. It has been found that the asymmetric excitation increases the decay rate of the jet centerline mean velocity by 30 % or more than the symmetric (θ = 180º). A flapping motion of the jet column is found to be responsible for the substantially increased jet mixing.

Keywords

Active jet control Minijet Flapping motion 

Notes

Acknowledgments

Y Zhou acknowledges the financial support from CSIRO Chief Executive Office through the Distinguished Visiting Scientist program, from Shenzhen Government Research Grants Council through grants JCYJ20120613134811717 and JCYJ20130402100505796, and from Research Grants Council of HKSAR through grant PolyU 5329/11E.

References

  1. Davis MR (1982) Variable control of jet decay. AIAA J 20(5):606–609CrossRefGoogle Scholar
  2. Raman G (1997) Using controlled unsteady fluid mass addition to enhance jet mixing. AIAA J 35(4):647–656CrossRefGoogle Scholar
  3. Zhou Y, Du C, Mi J et al (2012) Turbulent round jet control using two steady minijets. AIAA J 50(3):736–740CrossRefGoogle Scholar
  4. Zhang P (2014) Active control of a turbulent round jet based on unsteady minijets. PhD thesis. The Hong Kong Polytechnic UniversityGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Institute for Turbulence-Noise-Vibration Interaction and Control, Shenzhen Graduate SchoolHarbin Institute of TechnologyShenzhenChina
  2. 2.Department of Mechanical EngineeringThe Hong Kong Polytechnic UniversityHung HomHong Kong
  3. 3.CSIRO Manufacturing FlagshipClayton South MDCAustralia

Personalised recommendations