基于响应面法的钻割一体化喷嘴稳健性优化

Robustness optimization of drilling-slotting integration nozzle based on response surface methodology

针对现有钻割一体化喷嘴可靠性及破岩能力较差的问题,在泵压(30 MPa)一定的条件下,基于Hashish切割理论,以喷嘴出口直径、收缩角、出口圆柱段长度以及锥形直线段长度为设计变量,以喷嘴出口轴心速度为响应变量,结合喷嘴特征参数与钻割一体化钻头的匹配及加工精度问题,选择适当的约束条件,以喷嘴出口轴心速度最大为优化目标,采用响应面法(RSM)结合物理试验验证,在单因素筛选实验的基础上,建立了响应变量与其主控因素之间的响应面模型,分析了各主控因素之间交互作用对响应变量的影响规律,对适合松软煤层的大直径喷嘴进行稳健性优化.试验验证表明:相同条件下,喷嘴流量系数提高了1.26%,冲蚀体积明显增加,破岩能力及效果增强.

In accordance with the problem of poor reliability and rock-breaking performance of drilling-slotting integration nozzle, based on Hashish slotting theory and the single-factor screening experiment, the response surface methodology （RSM） was adopted to establish the response surface model between response values and predominant influencing factors under the pump pressure of 30 MPa and optimize the geometric parameters of large-diameter nozzle which is effective for soft coal seam by considering outlet diameter, shrinking angle, length of outlet cylinder and length of conical straight line as design variables and regarding outlet axial velocity as response variable. Given the matching between nozzle parameters and drilling-slotting-inte- gration drill and machining accuracy, the proper constraint conditions were selected and the maximum of outlet axial velocity was chosen as optimal objective. Besides, the interaction be- tween the predominant influencing factors on the response variable was analyzed. The experi- mental results indicate that flow coefficient increases by 1.26 %, the volume of broken rock ri- ses significantly, the capacity and effect of rock breaking are enhanced under the same conditions.