CAJ | 학술논문

采用RNG k-ε湍流模型，结合混合双流体模型对同轴气流引射式喷嘴的内部流动特性进行了数值模拟，考察进气压力对喷嘴流动特性的影响，得到气液流量变化规律，并与试验结果进行了对比，验证了模型的可靠性。研究结果表明，由于同轴气流引射式喷嘴内部存在中心负压区域，实现了对液体的引射。随着进气压力增大，喷嘴出口的湍动能增大，液体体积分数减小，气液混合效果增强，有利于提高雾化质量。液体流量随着进气压力的增大呈先增大后减小的变化趋势，因此，进气压力需要控制在合理范围内。
채용RNG k-ε단류모형，결합혼합쌍류체모형대동축기류인사식분취적내부류동특성진행료수치모의，고찰진기압력대분취류동특성적영향，득도기액류량변화규률，병여시험결과진행료대비，험증료모형적가고성。연구결과표명，유우동축기류인사식분취내부존재중심부압구역，실현료대액체적인사。수착진기압력증대，분취출구적단동능증대，액체체적분수감소，기액혼합효과증강，유리우제고무화질량。액체류량수착진기압력적증대정선증대후감소적변화추세，인차，진기압력수요공제재합리범위내。
Numerical simulation and analysis were carried out on the internal two-phase flow field of a new coaxial air-injected atomizer by turbulence model RNG k-εand multi-fluid mixture model. The effect of inlet gas pressure on gas and liquid flow characteristic was studied, while the simulation results verified with experimental data. Results show that the pressure value of central field in mixing chamber is negative value, which guarantees that liquid could be injected into atomizer. The turbulence kinetic energy increases with the inlet gas pressure increasing, which enhances the mixing of liquid and gas and improves atomization quality. However, the liquid flow rate reached the peak value when the inlet gas pressure is equal to 0.1MPa. Therefore, the inlet gas pressure should be controlled in reasonable range.