基于响应面分析的附壁脉冲射流喷嘴优化设计

Optimization Design of Coanda Effect Jet-Nozzle Based on Response Surface Method

为了提高附壁脉冲射流喷嘴结构的可靠性,针对某一超深油井井下附壁射流喷嘴,采用中心复合响应面设计与数值模拟方法,以反馈通道直径、附壁夹角和出口直径为优化变量,以射流的压力脉动幅值为优化目标,开展了喷嘴结构的优化设计。通过试验与数值模拟结果对比,验证了数值模拟方法的可靠性。对响应面结果的拟合回归方程、三维立体图和等高线进行了分析,分析结果表明,出口直径的变化对响应值压力脉动幅值的影响最为明显,较小的出口直径能够获得更大的压力脉动幅值。基于响应面分析结果,得到了优化的附壁脉冲射流喷嘴结构。对优化得到的附壁脉冲射流喷嘴内流场开展数值模拟分析,得到其脉动幅值为0.308 MPa,与响应面模型预测值非常接近,进一步验证了采用中心复合响应面法优化得到的附壁脉冲射流喷嘴结构的可靠性。研究方法与结果可为类似结构的优化设计提供参考。

To improve the reliability of the Coanda effect jet nozzle structure,for the Coanda effect jet nozzle applied in an ultra-deep oil well,a central composite response surface design and numerical simulation method are used.With the feedback channel diameter,wall angle and outlet diameter as optimization variables,the optimal design of the nozzle structure was carried out taking the pressure pulsation amplitude of the jet as the optimization target.The experiment and numerical simulation results are compared to verify the reliability of the numerical simulation method.The fitting regression equation,three-dimensional stereogram and contour line of the response surface results are analyzed.The results show that:the outlet diameter has the most significant effect on the response value pressure pulsation amplitude.Smaller outlet diameter can obtain a larger pressure pulsation amplitude.Based on the results of response surface analysis,the optimized structure of the Coanda effect jet nozzle was obtained.The numerical simulation analysis of the flow field in the optimized Coanda effect jet nozzle was carried out,and its pulsation amplitude was 0.308 MPa,which was very close to the predicted value of the response surface model.It further verified the reliability of attaining Coanda effect jet nozzle structure optimized by the central composite response surface method.The research methods and results can provide a reference for the optimization design of similar structures.