本文選題：溫度 + 模型��； 參考：《農(nóng)業(yè)工程學報》2017年16期

【摘要】：為了研究濕簾風機縱向通風系統(tǒng)應用于肉牛舍的夏季降溫效果,該試驗在現(xiàn)場環(huán)境指標實測的基礎(chǔ)上,采用計算流體力學(computational fluid dynamics,CFD)的方法對濕簾風機縱向通風肉牛舍的氣流場與溫度場進行模擬,并對系統(tǒng)進行改進與優(yōu)化。模擬時將牛只按與實物原型等比例引入到模型中,結(jié)果表明:舍內(nèi)溫度分布均勻,但受牛體擋風的影響,氣流分布不均,高風速區(qū)主要集中在屋頂及飼喂走道,可達0.9~1.2 m/s;牛活動區(qū)域風速較小,均小于0.6 m/s,不能滿足飼養(yǎng)標準。在75個風速測定點剔除異常值后,氣流場的相對誤差范圍為0.16%~94.41%,平均相對誤差為34.53%,45個溫度測點的相對誤差范圍為0.09%~10.74%,平均相對誤差4.71%。通過溫度場吻合性結(jié)果確定模擬與實測有較好的吻合度。在不改變牛舍圍護結(jié)構(gòu)及舍內(nèi)構(gòu)造的前提下,對牛舍進行優(yōu)化,舍內(nèi)安裝導流板,使得溫度與氣流場的分布均勻性顯著提高,降溫效果更為顯著。該研究可為濕簾風機牛舍的優(yōu)化設(shè)計和環(huán)境調(diào)控提供參考。
[Abstract]:In order to study the cooling effect of vertical ventilation system of wet curtain fan applied to beef shed in summer, the test was based on the field measurement of environmental indexes. The air flow field and temperature field of the longitudinal ventilated beef shed of wet curtain fan were simulated by computational fluid dynamics (CFD) method, and the system was improved and optimized. The results show that the temperature distribution in the house is uniform, but due to the influence of the windshield, the air flow distribution is uneven, and the high wind speed area is mainly concentrated on the roof and feed walkway. The wind speed in the active area of cattle was smaller than 0.6 m / s, which could not meet the standard of feeding. After eliminating abnormal values at 75 wind speed measuring points, the relative error range of airflow field is 0.16 ~ 94.41, the average relative error is 34.53, the relative error range of 45 temperature measuring points is 0.09 and 10.74, and the average relative error is 4.71. Through the results of temperature field coincidence, it is determined that the simulation has a good agreement with the actual measurement. On the premise of not changing the enclosure structure and the inner structure of the cowshed, the sheds are optimized and the flow guide plate is installed in the sheds, so that the distribution uniformity of temperature and airflow field is improved significantly, and the effect of cooling is more remarkable. This study can be used as a reference for the optimization design and environmental control of wet curtain fan cowshed.
【作者單位】： 中國農(nóng)業(yè)大學動物科技學院;動物營養(yǎng)學國家重點實驗室;北卡羅來納州立大學計算機科學;高安市裕豐農(nóng)牧有限公司;
【基金】：公益性行業(yè)(農(nóng)業(yè))科研專項基金南方地區(qū)草食家畜舍飼小氣候調(diào)控技術(shù)研究(201303145) 國家肉牛耗牛產(chǎn)業(yè)技術(shù)體系(CARS-38)
【分類號】：S817

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