生物质热解油喷雾特性试验

采用相位多普勒粒子分析仪，研究生物质热解油喷雾特性，考察气液质量流量比对液滴平均直径的影响，并与0号柴油和生物油/乙醇混合燃料的喷雾特性进行对比。结果表明：生物油的索特平均直径沿着轴向距离的增加呈先减小后增大的趋势，沿着径向不断增大；随着气液质量流量比的增加，液滴的平均直径不断减小，但减小趋势变缓；柴油雾化性能最好，生物油最差，添加乙醇能增强生物油的雾化性能。利用试验数据拟合得到生物油索特平均直径的经验公式，拟合值与试验测量值吻合良好，为生物油燃烧喷嘴的设计和运行工况的优化提供了参考。

Spray Characteristics Experiment of Rice Husk Derived Bio-oil

The spray characteristics of bio-oil for combustion were investigated by phase Doppler anemometry(PDA) with Sauter mean diameter(SMD) as evaluating indicator.The effects of air liquid mass flow ratio(ALR) on SMD were analyzed.The SMD distributions along axial direction of bio-oil,diesel and bio-oil/ethanol blend spray droplets were also compared.The results showed that SMD of bio-oil spray droplets exhibited a tendency to first decrease and then increase along axial direction and increased continuously along radial direction.The SMD diminished with the increase of gas-liquid flow ratio and had little variation when the gas-liquid flow ratio exceeded a certain value.Among three kinds of fuels,the atomizing quality of diesel was the best,while that of the bio-oil was the worst.By adding ethanol to the bio-oil,the atomizing quality was improved.The empirical equation for the SMD was derived.The predicted results were found to be in a good agreement with the experiment results,which confirmed the reliability of the empirical equation and would offer information for designing bio-oil spray nozzle and optimizing bio-oil combustion conditions.