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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.
Aiming at the problem of poor reliability and rock breaking capability of existing drilling and cutting integrated nozzles, under the conditions of pump pressure (30 MPa), based on Hashish cutting theory, the nozzle outlet diameter, the angle of contraction, the length of outlet cylindrical section, The length of straight line segment is designed as a design variable. Taking the nozzle exit axial velocity as the response variable, the optimization of the nozzle exit axial velocity is optimized by matching the nozzle parameters with the drilling and drilling integrated bit and the machining accuracy. Goal, using Response Surface Methodology (RSM) combined with physical experiment verification. Based on the single-factor screening experiment, a response surface model between response variables and its main controlling factors was established. The interaction between the controlling factors was analyzed. The results show that under the same conditions, the nozzle flow coefficient increases by 1.26%, the erosion volume increases obviously, and the rock breaking ability and effect are enhanced.