Turbulent Round Jet Control Using Two Steady Minijets

Cm = mass flow rate ratio of minijets to main jet d = main jet diameter dr = diameter of minijet injection pinhole Eu = power spectral density function of u f0 = frequency of predominant quasi-periodical vortices in main jet f = fd=Ue K = centerline velocity decay rate R = radial distance of contraction from nozzle axis Re = exit Reynolds number, defined by Ued= Req = RHRV 1=2 RH = mean-velocity half-width in x; z plane RV = mean-velocity half-width in x; y plane St = Strouhal number, defined by f0d=Ue u = hot-wire signal Uc = local mean velocity on centerline Ue = bulk exit velocity Ue;c = centerline velocity at nozzle exit x, y, z = coordinates x0 = streamwise position of virtual origin of main jet U1 = Ue Ux 5d U2 = Ux 15d Ux 20d

[1]  E. Collin,et al.  Experimental study of a supersonic jet-mixing layer interaction , 2004 .

[2]  P. Kalt,et al.  PIV measurements of a turbulent jet issuing from round sharp-edged plate , 2007 .

[3]  J. McGuirk,et al.  Jet Mixing Enhancement Using Fluid Tabs , 2004 .

[4]  Tze How New,et al.  Effects of cross-stream radial injections on a round jet , 2006 .

[5]  Yu Zhou,et al.  Flow structure, momentum and heat transport in a two-tandem-cylinder wake , 2006, Journal of Fluid Mechanics.

[6]  Chih-Ming Ho,et al.  Dynamics of an impinging jet. Part 1. The feedback phenomenon , 1981, Journal of Fluid Mechanics.

[7]  Michael Amitay,et al.  Manipulation of an axisymmetric jet using continuous control jets , 2006 .

[8]  J. Mi,et al.  Centreline mixing characteristics of jets from nine differently shaped nozzles , 2000 .

[9]  Ephraim Gutmark,et al.  Flow control with noncircular jets , 1999 .

[10]  H. Tsai,et al.  Effects of Multiple Radial Blowing Around a Circular Jet , 2005 .

[11]  S. Crow,et al.  Orderly structure in jet turbulence , 1971, Journal of Fluid Mechanics.

[12]  J. Mi,et al.  Influence of jet exit conditions on the passive scalar field of an axisymmetric free jet , 2001, Journal of Fluid Mechanics.

[13]  Parviz Moin,et al.  Jet Mixing Enhancement by High-Amplitude Fluidic Actuation , 2000 .

[14]  J. Militzer,et al.  Effects of nonparallel exit flow on round turbulent free jets , 1989 .

[15]  C. Richards,et al.  Global density effects on the self-preservation behaviour of turbulent free jets , 1993, Journal of Fluid Mechanics.

[16]  F. Hussain,et al.  Elliptic jets. Part 1. Characteristics of unexcited and excited jets , 1989, Journal of Fluid Mechanics.

[17]  Allan Kirkpatrick,et al.  Centreline velocity decay measurements in low-velocity axisymmetric jets , 1997, Journal of Fluid Mechanics.

[18]  Chih-Ming Ho,et al.  Preferred modes and the spreading rates of jets , 1983 .

[19]  Michael R. Davis,et al.  Variable control of jet decay , 1982 .

[20]  Jean-Paul Bonnet,et al.  Direct numerical simulation of a jet controlled by fluid injection , 2002 .

[21]  Anjaneyulu Krothapalli,et al.  On the use of microjets to suppress turbulence in a Mach 0.9 axisymmetric jet , 2003, Journal of Fluid Mechanics.