扇贝剥离设备喷嘴内部流场的仿真分析与参数优化

Numerical Analysis of Water Jet Processing Nozzles’ Internal Flow Field

摘要:

本课题依托国家海洋公益性行业科技专项。由于采用水射流技术进行扇贝剥离加工有加工质量好；闭壳肌剥离完整；清洁卫生；加工原料易获得等诸多优点，故利用水射流技术对海湾扇贝闭壳肌剥离进行研究分析，以期得出一种新型的扇贝闭壳肌加工模式。由于喷嘴为该剥离设备的关键部件，而喷嘴参数变化会对流场速度分布产生影响。因此本文利用扇贝剥离加工的窄角扇形喷嘴内部流场的二维数学模型，将加工用窄角扇形喷嘴网格模型用quad-dominated（四边形占优）形式进行划分。并通过FLUENT流体计算软件，采用标准κ-ε湍流模型对窄角扇形喷嘴内部流场进行了仿真，通过分析喷嘴锥角、出口直径、出口长度等变化对出口处流场速度分布影响，得出适用于水射流加工扇贝的喷嘴的最优参数组合。

Abstract:

The subject relies on “The National Marine Public Industry Science And Technology Project”. Water jet technology for scallops shelling processing has many advantages: high processing quality; sanitary and safety; material is easy to obtain. Research on the bay scallop in adductor muscle processing was to obtain a new type of scallop in shell adductor muscle processing mode, and water jet on scallop processing was discussed. The nozzle is critical component in shelling equipment, and nozzle parameters would affect the flow velocity distribution. Based on 2-D flow mathematical model, quad-dominated grid was divided. The narrow-angle fan nozzle’s internal flow field was simulated by standard turbulence model. The influence on nozzle velocity distribution such as cone angle, outlet diameter, outlet length were analyzed. After comprehensive analysis, the optimal parameter combination of the nozzle for water jet processing were obtained.