Zhongguo youzhi (Mar 2024)
同向全啮合双螺杆植物蛋白挤出机不同螺杆元件的 仿真分析Simulation analysis of different screw elements of co-rotating full-meshing twin-screw vegetable protein extruder
Abstract
为了明确和量化同向全啮合双螺杆挤出机各螺杆元件的功能，增加配置用于生产植物基肉双螺杆挤出机螺杆的合理性，以低温脱脂花生蛋白粉的物性参数为条件,对SLZ36型挤出机的3种元件长度为32 mm的螺杆元件双头螺旋元件、5啮合盘啮合元件及3齿形盘齿形元件的剪切速率、混合指数、物料停留时间、最大剪切应力分布进行仿真分析。采用Solidworks软件建立元件的几何模型，应用Gambit软件进行模型的网格划分及网格质量分析，在Polyflow软件中进行数值模拟，通过Fieldview软件对仿真结果进行后处理分析。结果表明：通过混合指数分析得到3种螺杆元件对物料的混合性能大小为齿形元件>啮合元件>螺旋元件；通过物料停留时间分析得到3种螺杆元件的轴向混合性能大小为齿形元件>螺旋元件>啮合元件；通过剪切速率及平均最大剪切应力分析得到对物料的剪切性能大小为啮合元件>螺旋元件>齿形元件。 进行植物基肉双螺杆挤出机螺杆组合时，针对目前整个螺杆配置螺旋元件最多的情况，在进行物料更换时可以合理地配置啮合元件以增加螺杆剪切能力，配置齿形元件以增加螺杆的混合能力。In order to clarify and quantify the functions of each screw element in the co-rotating full-meshing twin-screw extruder, and to increase the rationality of configuring screws for the twin-screw extruders used for the production of plant-based meat, the shear rate, mixing index, material residence time, and maximum shear stress distribution of double helix elements, 5-mesh disc meshing elements, and 3-tooth disc tooth shaped elements of 32 mm screw elements in the SLZ36 type extruder were simulated and analyzed under the condition of physical parameters of low-temperature defatted peanut protein powder. Solidworks software was used to establish the geometric model of the elements, Gambit software was used for mesh partitioning and mesh quality analysis of the model, numerical simulation was conducted by Polyflow software, and the simulation results were post-processed and analyzed using Fieldview software. The results showed that the mixing performance order of the three screw elements on materials through mixing index was tooth shaped elements>meshing elements>helix elements, the axial mixing performance order of three screw elements was tooth shaped elements>helix elements>meshing elements through material residence time analysis, the shear performance of materials order of three screw elements was meshing elements>helix elements>tooth shaped elements through the analysis of shear rate and average maximum shear stress. When combining the screws of twin-screw extruder used for production of plant-based meat, considering the helix elements is the maximum case of the whole screw, the meshing elements and tooth shaped elements can be reasonably configured to increase the shear capacity of the screw and the mixing ability of the screw, respectively.
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