A QUASI-AXISYMMETRIC APPROXIMATION FOR TURBULENT, THREE-DIMENSIONAL JETS AND WAKES,
Abstract
An approximation is proposed for predicting the mean properties of three-dimensional, incompressible, turbulent jets and wakes. The theory is applicable to the fully developed 'far field' of such flows. Experimental evidence for both jets and wakes dictates the basic arguments comprising the approximation: (1) rate of decay of velocity or velocity defect along the axis assumes the axisymmetric value well before the flow field itself becomes axisymmetric, (2) velocity profiles in the far field are similar in both principal planes of the flow field with the similarity variable a function of the growth rate along the pertinent principal axis, and (3) the contours of constant streamwise component of mean velocity are affinely related. These factors are utilized to develop a 'quasi-axisymmetric' approximation which reduces the three-dimensional mean flow equations to the well-known axisymmetric forms. Comparisons with available experimental data reveal uniformly good agreement for both jet and wake flows. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1968
- Accession Number
- AD0671126
Entities
People
- Pasquale M. Sforza
Organizations
- New York University Tandon School of Engineering