Detailed Validation of the New Atomization Concept Derived from Drop Tower Experiments ∼Aimed at Developing a Turbulent Atomization Simulator∼

Abstract

The new atomization concept derived from the drop tower experiments claims that a liquid issued from an injector is destabilized by itself in a deterministic way. Therefore, we can predict where the jet disintegrates or onsets turbulent atomization, if the undergoing self-destabilizing mechanism is found. On the other hand, all conventional theories assume the presence of ” unknown” nozzle flow noises as the sources of excited jet instabilities. Therefore, what we can know is only the possibility of excitation of a specific instability. If an observed convectively unstable wave is produced by an “unknown” mechanism operating within the liquid jet region, one might attribute the instability excitation to nozzle flow noises. Our investigations show that this is the case in the conventional theories because they have overlooked the effects of nonlinear phenomena occurring in a downstream jet region. In the present paper, how various self-destabilizing mechanisms are being found and how new knowledge derived from these studies may be integrated into a turbulent atomization sub-grid model for LES are described, along with the space experiment purpose.