Evaluation of a Pulse Width Modulated Bypass Nozzle for the Development of a Variable Load Residential Oil Burner
Evaluation of a Pulse Width Modulated Bypass Nozzle for the Development of a Variable Load Residential Oil Burner作者机构：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
出 版 物：《Engineering（科研）》 (工程（英文）（1947-3931）)
年 卷 期：2018年第10卷第10期
页 面：643-654页
学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学]
主 题：Residential Oil Burner Variable Load Pulse Width Modulated Burner Nozzle Bypass Nozzle Droplet Spray Size Distribution Variable Fuel Firing Rate
摘 要：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.
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