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On the mixing flow structure of a turbulent cross jet

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Abstract

An experimental study on the structure of a turbulent cross jet mixing flow is presented. Diffusion rates, two and three dimensional flow structures, mean velocities turbulence intensities and turbulent shear stresses of the mixing flow were measured as varying the velocity ratio. Self-similar forms for the dimensionless mean velocity and turbulent shear stresses was obtained by correlating the measurement data resulting a remarkable agreement. It was found that the deviation gradient(a) is linearly correlated with the velocity ratio(R), and the cross section of the mixing flow is an elliptic form.

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Abbreviations

b :

Half width of jet

b Yv :

Half width of mixing flow in theY-direction

C.P.:

Geometrical cross point

D0 :

Nozzle diameter

R :

Velocity ratio

r :

Radial distance

\(\bar U\) :

Axial mean velocity

\(\bar U_1 \) :

Exit mean velocity(lower side)

\(\bar U_m \) :

Exial maximum mean velocity

\(\bar U_0 \) :

Exit mean velocity(higher side)

u′:

Turbulent component in theX v direction

\(\overline {u'v'} \) :

Reynolds’ stress in theX-Y plane

\(\overline {(u'v')} _m \) :

Maximum Reynolds’ stress in theX-Y plane

\(\overline {u'w'} \) :

Reynolds’ stress in theX-Z plane

\(\bar V\) :

Radial mean velocity

v′:

Turbulent component in theY v direction

w′:

Turbulent component in theZ v direction

X :

Axial direction

X 0 :

Distance between the nozzle exit and C.P.

X v :

Axial direction of mixing flow (R≠1.0)

Y :

Radial direction

Y D :

Deviation distance betweenX andX v axes

Y 0 :

Half distance between nozzles

Y v :

Radial direction of mixing flow (R≠1.0)

Z :

Normal direction ofX-Y plane

α:

Deviation gradient

η:

Defined asY/b orZ/b

θ:

Cross angle

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Authors and Affiliations

  1. Department of Precision Mechanical Engineering, Chonbuk National University, 560-756, Chonju, Korea

    Byung Joon Rho & Je Ha Oh

  2. Agency for Defense Development, 305-600, Daejon, Korea

    Dae Ok Lee

Authors
  1. Byung Joon Rho
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  2. Je Ha Oh
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  3. Dae Ok Lee
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Rho, B.J., Oh, J.H. & Lee, D.O. On the mixing flow structure of a turbulent cross jet. KSME Journal 9, 68–79 (1995). https://doi.org/10.1007/BF02954355

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  • DOI: https://doi.org/10.1007/BF02954355

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