Calculating Method of Critical Flow Velocity of Liquid Carrying in Undulating Pipeline Based on ISA-ELM Model
Under the influence of temperature,pressure and undulating terrain,liquid accumulation is easy to occur in the low and updip sections of pipelines,which has adverse effects on production.To avoid this situation,the critical flow velocity of liquid carrying was deter-mined based on the extended two-fluid model and minimum pressure drop method,and the experiment was designed in combination with Latin hypercube sampling.The conventional SSA algorithm was optimized by improving the initial population and adding cosine weight fac-tor,and the critical flow velocity of liquid carrying was calculated using the ISA-ELM combined model.In addition,the model was continu-ously modified according to the data such as fluctuation elevation,routing situation and frequency of fluctuation of actual pipeline.The re-sults show that the optimal structure of ELM model is type 6-11-1,and the activation function should adopt Tanh function.Compared with other models,the predicted value of ISA-ELM model has the highest agreement with the calculated value.The critical liquid carrying veloci-ty decreased with the increase of fluctuation times and increased with the increase of total fluctuation elevation.After the model modifica-tion,the correction value is more conservative,and the accuracy rate can reach 83.3％.The research results can provide practical refer-ence for the setting of industrial parameters of pipeline anti-fluid accumulation.
万方数据
维普
