吹扫式仿生嗅觉检测腔结构设计及流场性能模拟与试验

发布时间：2018-04-07 19:02

  本文选题：传感器　切入点：仿生　出处：《农业工程学报》2017年10期

【摘要】：为了优选吹扫式仿生嗅觉检测腔流场结构,提高腔内流体速度分布均匀稳定性,以气体运动微分方程为基础,利用计算流体力学软件Fluent对检测腔内部流场进行了三维数值模拟,得到了设计工况条件下的气体流动特性,提出并分析比较了3种检测腔模型,同时将最优模型的模拟值与试验数据进行了对比分析。计算结果表明,检测腔结构影响腔内气体流速分布,多管道式检测腔在沿管道轴向0.035~0.049 m,气流速度变化存在平滑区,且稳定在0.018~0.268 m/s,能够满足检测工作条件,而线性排列式不存在平滑区,平行排列式平滑区速度范围仅为0.001~0.018 m/s;多管道式检测腔在流速均匀稳定性方面存在优势,气流速度最大偏差比和不均匀系数分别为0.830 6和0.292 0;同时,在数值模拟腔内气体置换时间中,3种检测腔经历时间分别为223.4、302.0和213.8 s,多管道式结构的时间数值最小说明气流响应快,工作效率高。多管道式结构模型能有效改善传感器数值检测的一致性,模型试验中传感器灵敏度检测数值标准差范围为0.153 5~0.428 3,变异系数分布在0.030 5~0.082 7。该研究可为仿生嗅觉检测腔结构的流场均匀性设计提供参考。
[Abstract]:In order to optimize the flow field structure and improve the uniform stability of the velocity distribution in the cavity, a three-dimensional numerical simulation of the flow field in the cavity was carried out by using the computational fluid dynamics software Fluent, based on the differential equation of gas motion.The gas flow characteristics under design conditions are obtained, and three kinds of detection cavity models are proposed and compared. At the same time, the simulated values of the optimal model are compared with the experimental data.The calculation results show that the structure of the detection cavity affects the gas velocity distribution in the cavity, the multi-tube cavity is 0.035 ~ 0.049 m along the axial direction of the pipeline, and the variation of the gas velocity has a smooth region, and is stable at 0.018 ~ 0.268 m / s, which can meet the working conditions of the detection.However, there is no smooth region in the linear array, and the velocity range of the parallel arrangement is only 0.001 ~ 0.018 m / s. There is an advantage in the uniform stability of the velocity in the multi-tube cavity. The maximum deviation ratio and the non-uniform coefficient of the flow velocity are 0.830 6 and 0.292 0, respectively.In the numerical simulation of the gas displacement time in the cavity, the experienced time of the three detection cavities is 223.4302.0 and 213.8 s, respectively. The minimum time value of the multi-tube structure shows that the airflow response is fast and the working efficiency is high.The multi-pipe structure model can effectively improve the consistency of sensor numerical detection. In the model test, the range of sensor sensitivity detection numerical standard deviation is 0.153 ~ 0.428 3, and the coefficient of variation is 0.030 5 ~ 0.082 7.This study can be used as a reference for the design of flow field uniformity of bionic olfactory cavity structure.
【作者单位】： 中南林业科技大学机电工程学院;
【基金】：国家自然科学基金(31401281) 湖南省自然科学基金(14JJ3115) 湖南省高校科技创新团队支持计划(2014207) 湖南省科技计划重点研发项目(2016NK2151)
【分类号】：O35;TP212
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本文编号：1720464