Velocity Field Measurement and Numerical Analysis of Laminar Gas Free Jet Discharged into Ambient of Different Densities.

Abstract

We measured the velocity distributions of laminar round jets discharged into stagnant air by the LDV system. Using particles of smoke, we developed a measuring scheme to evaluate the velocity field exactly. We have measured the velocity field not only in the axial direction but also in the radial direction which has never been previously measured. In addition, we have suceeded in measuring the velocity field in the jet pipe. From this experiment, we have established the condition that the centerline velocity of jets is accelerated by gravitational force. To confirm the experimental results, we have carried out the numerical analyses using a code which we developed. The results of the numerical analyses supported those from the experiments.