Abstract
A computational study of the flow field characteristics and the performances of two-phase bubbly flow in water jet of a ramjet propulsion system with a diverging-converging nozzle has been performed. The analysis use a finite volume approach for the main flow coupled numerically with the Lagrangian equations for the bubbles motion including the change of bubbles radii with time. Computed results for an experimental two-phase flow in a ramjet propulsion system with a converging-diverging nozzle are presented to validate the numerical model. The performance of the ramjet for different initial velocities of the incoming water and for various locations of the bubbles injections has been studied. Results reveal that the best location for the bubbles injection is at the beginning of the nozzle section and produces a higher thrust. Key words: Bubble dynamic, water ramjet, thrust, computational fluid dynamics (CFD), two-phase flows.
Highlights
Considerable interest exists in the engine community in investigating two-phase bubbly flows in waterjet of a ramjet, experimentally, or numerically
Computational fluid dynamics (CFD) methods provide an efficient way of investigating the complex flow phenomena within two-phase flows in ramjet propulsion systems
A three dimensional, time-averaged Navier-Stokes solver couppled with the Lagrangian equations for the bubble motions and time bubbbles radii variations have been used to simulate the flow field of a two-phase bubbly water flow of a ramjet with diverging-converging nozzle
Summary
Considerable interest exists in the engine community in investigating two-phase bubbly flows in waterjet of a ramjet, experimentally, or numerically. Chahine et al (2008) performed the study of bubble-augmented water jet propulsion system of two phase model development and constructed experimental validations. Fu et al (2009) predicted the flow field and the produced thrust of a two-phase bubbly ramjet with converging-diverging nozzle using computational fluid dynamic approach. These three section for the physical processes including the diffuser, mixing chamber, and nozzle and construct separate mathematical models for these sections. Validation results in the form of velocity and pressure distributions against an experimental two-phase bubbly water flow ramjet are presented. 5. Solve the flow field including velocity and pressure distributions with the updated mean mixture density, and proceed to the time step. The dimensions of the grid are 30 × 40 × 175 in the radial, circumferential, and axial directions, respectively
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