本文選題：計算流體力學(xué)(CFD) + 優(yōu)化　； 參考：《農(nóng)業(yè)工程學(xué)報》2017年03期

【摘要】：針對鵝舍內(nèi)機械通風時大量氣流擴散于鵝舍上方而位于地面鵝只通風效果受阻的氣流問題,提出一種基于計算流體力學(xué)(computational fluid dynamics,CFD)的結(jié)構(gòu)優(yōu)化方案。通過在舍內(nèi)主梁下端安裝相同高度且與氣流方向呈一定傾角的多個可拉伸卷膜構(gòu)造方法,提高種鵝舍內(nèi)有效的通風效率。依據(jù)試驗現(xiàn)場邊界條件,構(gòu)建并求解了鵝舍的三維穩(wěn)態(tài)模型,舍內(nèi)40個測點的風速模擬值與實測值均方根誤差為0.152 m/s,最大絕對誤差為0.29 m/s,平均相對誤差為2.04%,驗證了建立的鵝舍CFD模型的準確性。根據(jù)不同優(yōu)化方案數(shù)值模擬了27組不同改造后鵝舍內(nèi)氣流場分布情況,仿真得出最優(yōu)組合方案:在42 m長的舍內(nèi)安裝卷膜個數(shù)為10個,卷膜與主梁豎直方向傾斜角度為60o以及卷膜最大下拉高度為1.2 m時舍內(nèi)通風效率最高、氣流分布最均勻。通過現(xiàn)場實測,對比改造前后40個測點的風速值,試驗結(jié)果表明:改造后鵝舍較常規(guī)鵝舍平均風速增加0.527 m/s,舍內(nèi)氣流不均勻系數(shù)降低32.2%。該試驗結(jié)果為種鵝舍的結(jié)構(gòu)設(shè)計、同類型畜禽舍結(jié)構(gòu)優(yōu)化以及改善通風降溫效果調(diào)控提供了一定的參考依據(jù)。
[Abstract]:In order to solve the problem that a large amount of airflow diffuses over the geese shed during mechanical ventilation and the airflow is blocked in the ground geese, a structural optimization scheme based on computational fluid dynamics (CFD) is proposed. In order to improve the effective ventilation efficiency of the sheds, several extensible membrane structures with the same height at the lower end of the main beam and a certain inclination to the air flow direction were installed in the sheds. According to the field boundary conditions, the three-dimensional steady-state model of geese house was constructed and solved. The root-mean-square error (RMS) of the simulated wind speed and the measured value is 0.152 m / s, the maximum absolute error is 0.29 m / s and the average relative error is 2.04 m / s, which verifies the accuracy of the CFD model. According to different optimization schemes, the distribution of airflow field in 27 groups of geese houses after different modifications were numerically simulated, and the optimal combination scheme was obtained: the number of coil films installed in 42m long sheds was 10. The ventilation efficiency is the highest and the airflow distribution is the most uniform when the vertical tilt angle between the roll film and the main beam is 60 o and the maximum pull-down height of the winding film is 1.2 m. The results showed that the average wind speed of the geese house increased by 0.527 m / s compared with that of the conventional geese house, and the non-uniformity coefficient of the airflow in the geese shed decreased by 32.2m / s. The results provided some references for the structural design of goose house, the optimization of the structure of the same type of livestock and poultry house, and the improvement of ventilation and cooling effect.
【作者單位】： 南京農(nóng)業(yè)大學(xué)工學(xué)院;常州市陽湖鵝業(yè)專業(yè)合作社;江蘇省農(nóng)業(yè)科學(xué)院畜牧研究所;
【基金】：江蘇省農(nóng)業(yè)科技自主創(chuàng)新項目(CX(15)1008) 國家現(xiàn)代農(nóng)業(yè)產(chǎn)業(yè)體系項目(CARS-43-16)
【分類號】：S835

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本文編號：1829860