【作者】 王晓琦；

【导师】 仇性启；

【作者基本信息】 中国石油大学 ， 化工过程机械， 2007， 硕士

【摘要】 论文针对目前工业上所采用的压力旋流喷嘴未能有效系列化的问题,在查阅大量相关文献的基础上,设计了一系列不同结构的旋流喷嘴,并利用高速摄像系统和APV激光测试系统,对不同操作参数和结构参数下喷嘴的内外流场进行冷态实验,进而分析总结出压力旋流喷嘴的设计流程。实验得到如下结论:操作压力小于0.05MPa时,出口空心度与雾化锥角均随操作压力增加而明显增大;操作压力达到0.15MPa后,喷嘴达到稳定工作状态,出口空心度与雾化锥角均逐渐趋于稳定值。随喷嘴出口长度和出口直径增加,出口空心度增大趋势较为明显,但随旋流室锥角增加,出口空心度变化不大。出口长度增加使雾化锥角逐渐减小;出口直径增加使雾化锥角逐渐增大;而旋流室锥角对雾化锥角影响不明显。随出口长度和出口直径的增加,雾锥边缘液滴索太尔直径SMD变化不大,而中部液滴SMD逐渐减小。出口长度、出口直径和旋流室锥角的增加均使截面粒径跨度SPAN增加,但出口直径的影响最为明显。对实验数据进行不同格式的拟合分别得到:特征结构参数δ与出口空心度μ,出口旋流度S0与雾化锥角β正切值,以及特性结构参数ε与-200mm截面平均SMD的经验关系式。实验数据对旋流喷嘴设计和现场应用具有重要指导意义。为深化对旋流喷嘴内流场形态的认识,论文应用FLUENT 6.0软件对的其进行了三维数值模拟,并与实验结果进行比较验证了所选用计算模型的合理性。更多还原

【Abstract】 Aiming at the problem that the swirling nozzle has not been set on series properly in industry, based on numerous literatures, a series of different swirling nozzles were designed. With the help of 504KC high-speed camera and APV laser system, experiments were carried out to study the inner and outer flow fields under different operating condition and structural parameters, and then to summarize the whole design process of pressure swirling nozzles. Conclusions as follows were drawn from the experimental results. When the operating pressure was less than 0.5MPa, the orifice hollow rate and atomization angle increased visibly; after operating pressure exceeded 0.15MPa, swirling nozzles reached stable work state, and the orifice hollow rate and atomization angle tended to achieve constants respectively. The increase of orifice length and diameter caused evident rise to orifice hollow rate, while the angle of swirling chamber brought little effect on it. The increase of orifice length leaded to the decrease of atomization angle, but the orifice diameter did the opposite effect, and the influence of swirling chamber angle was also not obvious. As the orifice length and width augmented, SMD of the edge did not change a lot, while SMD of center declined gradually. Orifice length, orifice diameter and swirling chamber angle all could make SMD span rise, but the impact of orifice width was the most evident factor. The experimental data were regressed with different format to find out the relationship between structural parameterδand orifice hollow rateμ, orifice swirling rate S0 and the tangent value of atomization angleβ, and structural parameterεand mean SMD on the -200mm section. Experimental result was of great significance to nozzle design and industrial application. In order to further the knowledge on inner flow field, FLUENT6.0 was applied to simulate the inner flow field in a swirling nozzle. By comparing with those experiment results, it was confirmed that the calculating model selected was available.更多还原