压降是评价和设计导叶式旋风分离器的重要性能指标。影响压降主要有导叶的包弧长L、出口角α,排气管的直径De、内置深度S,筒体的直径D、高度Hc,排尘锥高度Hz及排尘口直径Dv等几何参数,且各参数间耦合变化对压降产生的效应异常复杂。为预测八项参数为设计变量时压降的非线性变化,以减小压降为目标,采用响应面参数优化法优化导叶式分离器。结果表明：利用响应面优化法能成功对多参数进行优化组合,将压降减小69.8%。设计范围内压降对各参数均有依赖度,D、L增大会扩大压降,而De、α、S等参数增大又减小压降,结合数值模拟可知,几何参数改变影响导叶式分离器内部强旋转流场的分布,最优的参数组合可减弱内部湍流运动强度与涡流能量损耗,使其具有较高的降损能力,起到减小压降的目的。说明考虑多参数条件下交互性的协同优化方案可取,可为今后导叶式旋风分离器的设计提供思路。

The pressure drop is an essential performance index to evaluate and design guide vane cyclone separator. There are eight geometric parameters affecting pressure drop, such as the guide vanes’ arc length L, the exit angle α, the vortex finder diameter De, the inserting depth S of the vortex finder, cylinder diameter D, height of the cylinder Hc, dust cone height Hz and outlet diameter Dv, etc. Moreover, the effects of coupling changes among parameters on pressure drop is extremely complex. In order to predict the non-linear changes of the pressure drop when the eight parameters were design variables, and to reduce pressure drop by using the response surface parameter optimization method to optimize the guide vane separator. The results show that the response surface optimization method can successfully optimize the combination of multiple parameters and reduce the pressure drop by 69.8%. The pressure drop within the design range was dependent on all parameters, and the increase of D and L would increase the pressure drop, while the increase of D_e, α, S and other parameters would decrease the pressure drop. It was proved by .numerical simulation that the optimal combination of parameters can reduce the intensity of internal turbulent motion and eddy current energy loss, so that it has a higher loss reduction ability, thus reducing the pressure drop. It shows that the cooperative optimization scheme considering the interaction of multi-parameters is desirable, which can provide ideas for the design of guide vane cyclone separators in the future.

四川省科技计划重点项目(2017JY0047); 国家自然科学基金(51379179)