切向孔直径精度对离心喷嘴性能影响

为解决离心喷嘴流量系数理论计算与试验偏差普遍较大的问题，采用Fluent两相流模型计算了不同切向孔直径下的喷雾锥角、流量系数等性能参数，分析发现切向孔直径加工精度对离心喷嘴流量系数有较显著的影响。通过塞规测量了4个喷嘴的切向孔直径，利用切向孔直径测量平均值建立几何模型，计算了较大范围不同压降下的喷嘴性能，并与试验结果进行了对比。模型计算结果和试验数据吻合较好，喷雾锥角与试验偏差小于1°，流量系数偏差小于4.2%。 

Influence of precision of tangential port diameter on performance of swirl atomizer

In order to solve the problem of large deviation between theoretical calculation and test data of discharge coefficient of swirl atomizer，a two-phase flow computational model with Fluent was taken to investigate the performance of a swirl atomizer.The influences of machining precision of tangential port diameter on performance parameters，including spray angle and discharge coefficient were simulated.The results showed that the discharge coefficient was influenced obviously by the tangential port diameter precision.The average diameters of tangential ports of 4 swirl atomizers were measured using plug gauges.Models with measured average diameters were taken to evaluate the performance of the swirl atomizers under a wide range of different pressure drops，and the result was compared with test data.The computational results agreed well with the test data，the error of spray angle was less than 1°，and the discharge coefficient difference was within 4.2%.