Abstract

In nonpremixed combustion systems, fuel and oxidant are injected into the reaction chamber via two or more separate streams. Velocity measurements by laser anemometry within the chamber may be biased by individual streams unless the seeding concentrations of both streams are uniform and constant. In order to meet this requirement, a seeding technique has been developed to disperse 1-μm metal oxide particles at a controllable rate. Evaluations of the steadiness of particle generation indicate rms fluctuations are within 1.5% of the particle generation rate. Demonstration of the technique has been conducted in both nonreacting and reacting flows.

Highlights

  • The advent of laser anemometry (LA) for the measurement of velocity in fluids has prompted a requirement for the generation of micron-sized light scattering particles

  • The particles are needed to track the flow and allow the local velocity to be measured by scattering light from a sampling volume comprised of laser induced interferometric fringes

  • The data rate of validated scores was in excess of 500 events/sec and the signal quality was excellent with modest degradation in the reacting flow due to particle attrition in the regions of high temperature

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Summary

INTRODUCTION

The advent of laser anemometry (LA) for the measurement of velocity in fluids has prompted a requirement for the generation of micron-sized light scattering particles. The particles are needed to track the flow and allow the local velocity to be measured by scattering light from a sampling volume comprised of laser induced interferometric fringes. (2) generation of a steady flux of particles, generation of a particle size sufficiently small to track the fluid flow, and (3) control over the rate of particle generation. The present study addressed the development of a seed generation technique for combusting flows, and the evaluation of its performance in providing both a steady rate of injection and a uniform volumetric seed concentration for a combustion chamber featuring multiple stream injec.

PARTICLE GENERATOR
SYSTEM EVALUATION
Findings
SUMMARY
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