Unsteady, viscous, cavitating simulation of injector internal flows
Abstract
Unsteady 2-D viscous cavitating flows are numerically modeled by solution of the two phase Navier-Stokes Equations formulated with a pseudo-density model. Results are obtained for high L/D slots with chamfered orifices of various dimensions and compared to recent experiments. The model is used to study the effects of orifice size, pressure drop, and the site density (a free variable arising in the pseudo-density formulation relating to the number of nucleation sites in the flow field) on the length and periodicity of the cavitation region. A three dimensional, unsteady, viscous, two-phase Navier-Stokes solver has been developed for simulation of single or two phase flow within the complex geometries of liquid rocket engine and diesel injectors. The solver has been developed to run in parallel over a network of computers to decrease the amount of computation time required for simulations. The solver makes use of a pseudo-density model derived from the Rayleigh-Plesset relation for bubble dynamics. The model accounts for both pressure and inertial effects in the flow field. Simulations of manifold cross-flow over sharp edged orifice and diesel injector internal flows have been made and compared with available experimental results.
Degree
Ph.D.
Advisors
Heister, Purdue University.
Subject Area
Aerospace materials|Mechanical engineering|Fluid dynamics|Gases
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