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高关水库反抛物线形拦网设计(下)
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作者 张海明 冯建新 +1 位作者 王宇峰 胡昌杰 《水利渔业》 1989年第6期28-31,共4页
三、拦网受力计算拦网受力系指网衣、纲索、浮子阻力以及拦网上纲由此而产生的张力和浮、沉力.由于该库漂浮物少,只需管理时稍加清除即可避免漂浮物堆积而产生的阻力,故未将其考虑在内.(一)网衣阻力拦网上纲除其两端固定于东、西岸墩上外。
关键词 高关 水库 拦网 设计 反抛物线形
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高关水库反抛物线形拦网设计(上)
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作者 张海明 冯建新 +1 位作者 王宇峰 胡昌杰 《水利渔业》 1989年第5期29-32,共4页
高关水库可供设置拦网的断面距闸门近,水位涨落变幅大,拦网设计采用反抛物线形分层结构的型式。同时,根据高关水库鱼种、成鱼群体分层栖息的特点,拦网网目大小分层变化。拦网沉力配备,取用尼龙袋装盛卵石的装置。
关键词 高关 水库 拦网 设计 反抛物线形
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Optical Design of a Solar Parabolic Concentrating Collector Based on Trapezoidal Reflective Petals
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作者 Sasa Pavlovic Velimir Stefanovic +1 位作者 Darko Vasiljevic Emina Petrovic 《Journal of Energy and Power Engineering》 2015年第8期714-720,共7页
In this paper, detailed optical of the solar parabolic dish concentrator is presented. The system has diameter D = 2,800 mm and focal length f = 1,400 mm. The efficient conversion of solar radiation in heat at these t... In this paper, detailed optical of the solar parabolic dish concentrator is presented. The system has diameter D = 2,800 mm and focal length f = 1,400 mm. The efficient conversion of solar radiation in heat at these temperature levels requires a use of concentrating solar collectors. In this paper, detailed optical design of the solar parabolic dish concentrator is presented. The parabolic dish of the solar system consists from 12 curvilinear trapezoidal reflective petals. This paper presents optical simulations of the parabolic solar concentrator unit using the ray-tracing software TracePro. The total flux on receiver and the distribution of irradiance for absorbed flux on center and periphery receiver are given. The total flux at the focal region is 4,031.3 W. The goal of this paper is to present optical design of a low-tech solar concentrator, that can be used as a potentially low-cost tool for laboratory-scale research on the medium-temperature thermal processes, cooling, industrial processes, solar cooking and polygeneration systems, etc. 展开更多
关键词 Solar parabolic dish concentrator optical analysis solar energy solar radiation.
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