Session FN - Surface Tension.
ORAL session, Monday afternoon, November 25
Persian I, Hotel Syracuse
We have computationally modeled the flow in a simplex nozzle and have predicted the characteristics of the liquid sheet emanating from it. Simplex nozzles are commonly used for fuel injection in gas turbine engines. The Arbitrary Lagrangian-Eulerian numerical method is used with a finite volume formulation to solve the governing equations. The free-surface positions are tracked Lagrangianly, thereby avoiding any numerical smearing at the interface. An adaptive grid generation technique is used to body-fit the interior grids to the free surface. The thickness and the angle of the liquid sheet emanating from the nozzle have been predicted. As the commonly used simplex fuel nozzles are small, it is difficult to make accurate measurements on the fluid flow properties within the body of the nozzle and near the nozzle exit. To overcome these difficulties, a large-scale transparent prototype nozzle is used to provide adequate spatial resolution for observation. An argon laser is used for measurements of the liquid sheet thickness. The liquid surface positions as a function of time are recorded using a high speed camera. Comparison of our computational results with the experimental measurements show excellent agreement. *Work supported by Ohio Aerospace Institute and Parker Hannifin Co.