中文摘要：

在3D打印人造岩芯试验中,有很多因素制约着人造岩芯的打印精度,其中打印装置的喷嘴部分设计至关重要。为了研究入口直径、出口直径、收缩角和筒壁长对圆锥形喷嘴喷射性能的影响,用响应面分析法对喷嘴进行方案设计和优化,设计了三因素三水平正交试验,运用Solidworks软件分别绘制不同参数的喷嘴模型,并将模型导入到Fluent软件中进行流体分析;同时用多元二次回归方程来拟合因子和响应值之间的函数关系,得到了拟合方程,将模拟值和拟合值进行了对比。分析结果表明：用响应面分析法对喷嘴进行设计及优化,可以极大程度地减少工作量,提高效率。在喷嘴的几个参数中,对喷嘴出口速度影响最大的是出口直径。所得结论可为3D岩芯打印装置的进一步改进提供参考。

英文摘要：

In the test ol 3D printing artificial core, many factors influence the printing accuracy, in which the nozzle design ol the printing device is essential. To study the influence ol inlet diameter, outlet diameter, shrinkage angle and sleeve length on the jet performance ol conical nozzle, the nozzle was designed and optimized using re-sponse surface analysis method. Three-lactor three-level orthogonal test was designed. The nozzle model with differ-ent parameters has been established using Solidworks, and been introduced into the Fluent software for flow analy-sis. The multivariate quadratic regression equation has been used to fit the function relation between the factors and the response values so as to attain fitting equation. The simulation and fitting values were compared. The results show that the nozzle design and optimization using the response surface analysis method can greatly reduce the work-load and improve the efficiency. The outlet diameter has the greatest influence on the nozzle outlet velocity. The conclusion could provide references for the further improvement of 3D core printing device.