Structure of Reacting and Non-Reacting Swirling Air-Assisted Sprays

V G Mcdonell,G S Samuelsen,M Adachi

doi:10.1080/00102209208951821

V G Mcdonell, G S Samuelsen + Show 1 more

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https://doi.org/10.1080/00102209208951821

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Abstract

Abstract A detailed characterization of a methanol spray produced by an air-assist atomizer with swirling atomizing air has been conducted. This study is the third of a series which examines the structure of sprays produced by a standardized atomizer which can be operated in three modes, pressure swirl, non-swirling air-assist, and swirling air-assist. Measurements of drop size and three components of velocity, three components of the gas phase velocity, the concentration of hydrocarbons within the spray, and time resolved droplet measurements are obtained at axial locations of 7·5, 15, 25, 35, 50, 75, and 100 mm. These measurements are obtained for both reacting and non-reacting cases. In addition, the atomizing air flow in the absence of the spray is characterized. Primary observations from the present study are that (1) the presence of the drops alters the structure of the gas phase turbulence, including the degree of isotropy, (2) the presence of reaction strongly impacts the axial and radial velocity...

Highlights

Detailed studies of droplet behavior in spray flames are necessary to (I) develop understanding of the physical processes ofevaporation, fuel-air mixing, and transport phenomena. and (2) provide additional data for further development and verification of numerical codes
The results are presented in two sections, gas phase behavior and droplet behavior
The behavior of the single phase flow is considered within the gas phase results to provide a baseline against which the gas phase behavior in the presence of the spray can be compared

Summary

Introduction

Detailed studies of droplet behavior in spray flames are necessary to (I) develop understanding of the physical processes ofevaporation, fuel-air mixing, and transport phenomena. and (2) provide additional data for further development and verification of numerical codes. (2) provide additional data for further development and verification of numerical codes. Detailed studies of droplet behavior in spray flames are necessary to (I) develop understanding of the physical processes ofevaporation, fuel-air mixing, and transport phenomena. Such information is required to continue the current efforts to ( 1) mitigate environmental impact and (2) enhance performance and efficiency of liquidfueled continuous combustion systems. The present study was undertaken to examine the structure of sprays produced by a standardized atomizer which is capable of operating in a pressure swirl or air-assist mode. The first cwo parts provide results from a non-reacting pressure atomized spray (McDonell and Samuelsen, 199 Ia), and reacting and non-reacting, non-swirling, air-assit sprays (McDonell, Adachi, and Samuelsen, 199la, b)

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