STUDY OF THE TURBULENT AXISYMMETRIC JET.

The equations of motion for the axisymmetric turbulent jet at distances sufficiently removed from the source can be shown to have a self-preserving form and to yield to similarity solutions. It has been commonly assumed that collapse of the data in similarity variables validates the data as representing a fully-developed aixsymmetric jet in a infinite environment, since similarity solutions can be derived for no other. There are several reasons why this is not necessarily so. An experiment was carried out downstream of a one inch diameter jet. The results are presented and compared with those of previous studies. Concurrent with the attempt to measure the turbulent jet was an attempt to model it using J. L. Lumley's Reynolds stress closure model. The experimental and analytical results are then used to explain momentum loss in the flow.