摘要
为了揭示混合管结构对粒子分离器排砂用多喷管引射器性能的影响,采用标准k-ε湍流模型、标准壁面函数近似处理以及压力-速度耦合的SIMPLE算法,对多喷管引射器进行了数值模拟。对模拟结果的分析表明:针对圆柱形混合管,当混合管长径比Lm/d3等于0时,引射器性能最差;当Lm/d3大于2.4时,引射系数呈现下降趋势。对于混合管型面结构不同的引射器,当型面结构为圆柱形时,引射器性能最优;型面结构为椭圆形时,引射性能最差。方形和跑道形结构的混合管,引射系数出现交叉值,总体趋势上,方形混合管结构的引射器性能优于跑道形结构。
In order to investigate how the structure of mixing tube influences the performance of multi- nozzle ejector for pumping air containing sand in particle separator, a numerical simulation was conducted by using the standard k - s turbulence model, standard wall functions and SIMPLE method which solved pressure-velocity couping. The simulation drew some conclusions： as for the cylindrical mixing tube, when the ratio of length and diameter of mixing tube Lm/d3 equaled to 0, ejector performance was the worst while Lm/d3 was greater than 2.4, the entrainment ratio showed a downward trend. For various surface structure of mixing tube, the ejector performance presented the best with cylindrical surface structure while showed the worst with oval surface structure. For square and the runway-shaped structure of the mixing tube, the entrainment ratio showed crossover value, but on the overall trend, ejector performance with square mixing tube structure was better than the runway- shaped structure.
出处
《重庆理工大学学报（自然科学）》
CAS
2012年第10期19-24,共6页
Journal of Chongqing University of Technology：Natural Science
关键词
多喷管引射器
混合管长径比
型面结构
引射性能
multi-nozzle ejector
the ratio of length and diameter of mixing tube
surface structure
ejector performance
