Steady Jet Flow Research Articles

Steady incompressible jet flow—an engineer's guide

The literature on jets is extensive but scattered. A concise guide is needed, and this paper attempts (at the risk of over‐simplification) to summarise some of the available information, both theoretical and experimental (some of it obtained in the Department of Mechanical Engineering) on those jet properties which are important in engineering — velocity profile and decay, spread, entrainment and static pressure.

A Unified Treatment of Submerged Plane Turbulent Jets

A unified model has been derived which predicts the velocity distribution in a two-dimensional, submerged, turbulent steady jet flow issuing from a slit nozzle, with thin boundary layers at its exit. The model incorporates the influence of nozzle exit conditions on the flow in the transition and developing regions, and it is also applicable in the developed region with a suitable change. The unified treatment of the entire jet attempts to complement the previously proposed models stressing the effects that the flow conditions at the nozzle exert on the flow field.

The general and basic boundary value problems of plane steady jet flows and the corresponding nonlinear equations

The general boundary value problem, including known plane steady jet flows of an ideal incompressible fluid, is formulated. The simplest problem retaining all the specific features of the general problem, known as the basic problem, is separated from the general problem. The solution of the basic problem is reduced to solving a non-linear integro-differential equation and also to solving nonlinear integral equations. Examples of flows whose determination is reduced to' solving the basic problem are cited.

A one-dimensional treatment of inviscid jet or duct flow

Approximate equations involving one space dimension are derived for variablearea jet or duct flow. At a given cross section, the radial velocity and the sound speed are represented by distributions satisfying necessary boundary conditions for continuity and momentum. By integrating the full equations of inviscid motion over the cross section, quasi-one-dimensional equations with time and axial distance as independent variables are obtained. The equations for duct flow are the same as the characteristic equations from a purely one-dimensional treatment, but with an additional term. The equations for jet flow are also in characteristic form. Sample solutions for four steady jet flows are compared with available results from experiment and with the method of characteristics; agreement is satisfactory. Possible extensions of the technique employed are discussed.