本文選題：傳感器　切入點(diǎn)：仿生　出處：《農(nóng)業(yè)工程學(xué)報(bào)》2017年10期

【摘要】：為了優(yōu)選吹掃式仿生嗅覺(jué)檢測(cè)腔流場(chǎng)結(jié)構(gòu),提高腔內(nèi)流體速度分布均勻穩(wěn)定性,以氣體運(yùn)動(dòng)微分方程為基礎(chǔ),利用計(jì)算流體力學(xué)軟件Fluent對(duì)檢測(cè)腔內(nèi)部流場(chǎng)進(jìn)行了三維數(shù)值模擬,得到了設(shè)計(jì)工況條件下的氣體流動(dòng)特性,提出并分析比較了3種檢測(cè)腔模型,同時(shí)將最優(yōu)模型的模擬值與試驗(yàn)數(shù)據(jù)進(jìn)行了對(duì)比分析。計(jì)算結(jié)果表明,檢測(cè)腔結(jié)構(gòu)影響腔內(nèi)氣體流速分布,多管道式檢測(cè)腔在沿管道軸向0.035~0.049 m,氣流速度變化存在平滑區(qū),且穩(wěn)定在0.018~0.268 m/s,能夠滿足檢測(cè)工作條件,而線性排列式不存在平滑區(qū),平行排列式平滑區(qū)速度范圍僅為0.001~0.018 m/s;多管道式檢測(cè)腔在流速均勻穩(wěn)定性方面存在優(yōu)勢(shì),氣流速度最大偏差比和不均勻系數(shù)分別為0.830 6和0.292 0;同時(shí),在數(shù)值模擬腔內(nèi)氣體置換時(shí)間中,3種檢測(cè)腔經(jīng)歷時(shí)間分別為223.4、302.0和213.8 s,多管道式結(jié)構(gòu)的時(shí)間數(shù)值最小說(shuō)明氣流響應(yīng)快,工作效率高。多管道式結(jié)構(gòu)模型能有效改善傳感器數(shù)值檢測(cè)的一致性,模型試驗(yàn)中傳感器靈敏度檢測(cè)數(shù)值標(biāo)準(zhǔn)差范圍為0.153 5~0.428 3,變異系數(shù)分布在0.030 5~0.082 7。該研究可為仿生嗅覺(jué)檢測(cè)腔結(jié)構(gòu)的流場(chǎng)均勻性設(shè)計(jì)提供參考。
[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.
【作者單位】： 中南林業(yè)科技大學(xué)機(jī)電工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金(31401281) 湖南省自然科學(xué)基金(14JJ3115) 湖南省高�？萍紕�(chuàng)新團(tuán)隊(duì)支持計(jì)劃(2014207) 湖南省科技計(jì)劃重點(diǎn)研發(fā)項(xiàng)目(2016NK2151)
【分類號(hào)】：O35;TP212
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本文編號(hào)：1720464