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- 저자 : Hongfu Zhang (검색결과 2 건)
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Effects of vortex generators on the wind load of a flat roof: A computational study
Yagebai Zhao,Xiaolong Deng,Hongfu Zhang,Dabo Xin,Zhiwen Liu 한국풍공학회 2021 Wind and Structures, An International Journal (WAS Vol.32 No.1
Vortex generators are commonly used in mechanical engineering and the aerospace industry to suppress flow separation owing to their advantages of simple structure, economic viability, and high level of efficiency. Owing to the flow separation of the incoming wind on the leading edge, a suction area is formed on the roof surface, which results in a lifting effect on the roof. In this research, vortex generators were installed on the windward surface of a flat roof and used to disturb to roof flow field and reduced suction based on flow control theory. Computational fluid dynamics (CFD) simulations were performed in this study to investigate the effects of vortex generators on reduce suction. It was determined that when the vortex generator was installed on the top of the roof on the windward surface, it had a significant control effect on reduce suction on the roof leading edge. In addition, the influence of parameters such as size, placement interval, and placement position of the vortex generator on the control effect of the roof’s suction is also discussed.
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Farzana Abbasi,Jingbo Liu,Hongfu Zhang,Xiaoyun Shen,Xuegang Luo 아세아·태평양축산학회 2018 Animal Bioscience Vol.31 No.1
Objective: A 14-d trial was conducted to determine the effects of feeding corn naturally contaminated with aflatoxin B1 (AFB1) on growth performance, apparent ileal digestibility, serum hormones levels and gene expression of Na+, K+-ATPase in ducklings. Methods: A total of 704 ducklings were blocked on the basis of sex and body weight (BW), and then allocated randomly to one of the following two treatments: i) CON, basal diet and ii) AFB1, diets with 100% of normal corn replaced with AFB1 contaminated corn. There were 22 pens per treatment and 16 birds per pen. The concentration of AFB1 was 195.4 and 124.35 μg/kg in the contaminated corn and AFB1 diet, respectively. Results: The AFB1 decreased average daily gain, average daily feed intake, d 7 BW, final BW in the whole trial, and feed conversion ratio (FCR) during d 8 to 14 and d 1 to 14 by 10% to 47% (p<0.05), while FCR during d 1 to 7 was increased (p<0.05). AFB1 did not affect mortality to 7 d of age, and then increased to 5.8% from 8 to 14 d of age (p<0.01). Apparent ileal gross energy digestibility was reduced by AFB1, whereas apparent ileal digestibility of dry matter, nitrogen, and amino acid was improved (p<0.01). Feeding AFB1 diets increased serum concentration of leptin and insulin-like growth factors-1 (IGF-1) (p<0.05), but had no effect on neuropeptide Y, ghrelin, cholecystokinin-8 or insulin (p>0.05). Dietary treatments did not influence relative expression of jejunal Na+, K+-ATPase gene (p>0.05). Conclusion: Taken together, feeding corn naturally contaminated with AFB1 reduced growth performance, improved apparent ileal digestibility, and affected serum leptin and IGF-1 in ducklings from d 1 to 14.
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