Flapping Motion of a Turbulent Jet Under the Asymmetric Excitation of Two Unsteady Minijets
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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.
KeywordsActive jet control Minijet Flapping motion
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.
- Zhang P (2014) Active control of a turbulent round jet based on unsteady minijets. PhD thesis. The Hong Kong Polytechnic UniversityGoogle Scholar