CALCULATION OF THE TRANSITION REGION OF A TURBULENT JET,
Abstract
An approximate calculation method is developed for the transition sections of plane and axisymmetric turbulent jets in a co-moving stream. It is shown why earlier methods, based on differentiation between the initial and final sections, are not applicable in the transition (mixing) region. The velocity profiles obtained by this method in the transition region turn out to be the same for plane and axisymmetric jets, and can be used to calculate the variation of the jet parameters along the stream axis by using the set of integral equations connecting the angular momentum and the energy. Limiting parameters are defined under which the results coincide with the velocity profile of the main section of the turbulent jet. It is concluded that in first approximation the external boundary of the transition layer is straight and is a continuation of the outer boundary of the outer section. The method is then demonstrated to be suitable for a determination of continuous velocity-profile deformation in the transition region. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 07, 1968
- Accession Number
- AD0682107
Entities
People
- A. S. Ginevskii
Organizations
- National Air and Space Intelligence Center