The Creation of a Gas-Liquid Nozzle with Predictable Behaviour

Abstract

The Euler-Euler models of different complexity levels (from one-dimensional monodisperse model to two-dimensional polydisperse model with drop interaction one) are used for acceleration nozzle design.The optimum value of liquid-to-gas mass flow rate ratio was defined theoretically and experimentally in maximum range nozzle-jet system.The numerical-and-experimental method of searching optimal condition for "mixer+nozzle" system has been formulated. A method of mixture generation has been selected.The experimental investigations of adjusted nozzles were made in order to define a physical flow model and to estimate the application of mathematical models. Photoshooting in the flash light (duration from 10 -6 s) was used. Gas and liquid mass flow rate, distribution of pressure along a convergentdivergent nozzle wall were measured. Modified probe and laser methods were used in order to receive gas and liquid velocity and volume concentration data.It is shown that the flow structure in or near the nozzle is fragmentary (cluster), in other words the flow contains not only drops, but also fragments of liquid film. For such flows the numerical models are used as minimax estimate. The outcomes of numerical simulation are presented in this paper too.