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Evaluation of a Pulse Width Modulated Bypass Nozzle for the Development of a Variable Load Residential Oil Burner

Engineering（科研） 2018年第10期10卷 643-654页

作者： Mebougna L. Drabo narinder k. tutu Thomas Butcher George Wei Rebecca Trojanowsk. Department of Mechanical & Civil Engineering and Construction Management Alabama A & M University Normal AL USA Sustainable Energy Technology Department Brookhaven National Laboratory Upton NY USA

Due to the need for energy conservation in buildings and the simultaneous benefit of cost savings, the development of a low firing rate load modulating residential oil burner is very desirable. One of the two main requirements of such a burner is the development of a burner nozzle that is able to maintain the particle size distribution of the fuel spray in the desirable (small) size range for efficient and stable combustion. The other being the ability to vary the air flow rate and air distribution around the fuel nozzle in the burner for optimal combustion at the current fuel firing rate. In this paper, which deals with the first requirement, we show that by using pulse width modulation in the bypass channel of a commercial off-the-shelf bypass nozzle, this objective can be met. Here we present results of spray patterns and particle size distribution for a range of fuel firing rates. The results show that a desirable fuel spray pattern can be maintained over a fuel firing rate turndown ratio (Maximum Fuel Flow Rate/Minimum Fuel Flow Rate) of 3.7. Thus here we successfully demonstrate the ability to electronically vary the fuel firing rate by more than a factor of 3 while simultaneously maintaining good atomization.

关键词： Residential Oil Burner Variable Load Pulse Width Modulated Burner Nozzle Bypass Nozzle Droplet Spray Size Distribution Variable Fuel Firing Rate

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On the Role of Electrodes in Introducing Airflow Distortion in Residential Oil Burners

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Engineering（科研） 2019年第5期11卷 260-271页

作者： Mebougna L. Drabo narinder k. tutu Thomas Butcher Rebecca Trojanowsk. Stephen U. Egarievwe Department of Mechanical & Civil Engineering and Construction Management Alabama A & M University Normal AL USA Sustainable Energy Technology Department Brookhaven National Laboratory Upton NY USA Department of Electrical Engineering and Computer Science Alabama A&M University Normal AL USA

Computational Fluid Dynamics (CFD) simulations of airflow through a retention head residential oil burner were carried out to study the velocity field near and around the fuel spray. The simulations revealed (as expected, based on some previous experimental measurements) the velocity flow field to be far from axisymmetric. Moreover, the center of the swirling airflow was found to be at some radial distance away from the physical centerline of the flame tube. Since it was suspected that the two electrodes just upstream of the retention ring of the burner might be responsible for this flow distortion, additional CFD simulations were then carried out for the cases of no electrodes and 4-electrodes. The results clearly show that all flow distortions (velocity deviations from axisymmetric value) vanish when no electrodes are present and that the flow distortions are reduced by a factor of 2 when two additional dummy electrodes (for a total of 4 electrodes) are included in the burner design. Furthermore, for the 4-electrode case, the eccentricity of the swirling airflow is reduced by almost a factor of 3 as compared to the base design case of 2-electrodes.

关键词： Flow Distortion Residential Oil Burner Retention Head Flame Tube Swirl Airflow

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