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thermal stratification     
相关语句
  热分层
     Obtains two kinds of quantity group based on the similitude principle, i.e. the dimensionless similarity criterion and the dimensional thermal stratification height.
     根据相似原理综合各因素得到了两种形式的综合量:无量纲的相似准则和热分层高度等量纲不为一的综合量。
短句来源
     EXPERIMENTAL STUDY ON THE INFLUENCE OF THERMAL STRATIFICATION ON BLEVE
     热分层对蒸汽爆炸过程影响的实验研究
短句来源
     The results show that the thermal stratification is present in the room,the cooling load of work zone is no more 57% of the total load of the room,ventilation efficiency varies with time and the maximum value will be 1.77 when the cooling load is at its highest.
     计算结果表明,置换通风房间具有热分层特性,该房间工作区最大负荷只有全室负荷的不到57%,通风效率随时间变化且在最大负荷时刻附近达到最大值约1.77.
短句来源
     A series of experiments (at the filling level of 85% and 45%) have been carried out to study thermal stratification and its influence on BLEVE.
     本文针对液化石油气受热侵袭时出现的热分层及其对蒸汽爆炸的影响进行了模拟实验研究。 在不同充装度(85%和45%)下的热响应实验证明,当储罐受到外部热源的侵袭时,在气液相区均存在着热分层
短句来源
     Experimental Analysis of Velocity Field and Thermal Stratification in Large Enclosure With Forced Jets
     具有强迫射流的大型腔体中的速度场和热分层实验分析(英文)
短句来源
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  热力分层
     According to the working principle of displacement ventilation system and domestic research,this paper studies the thermal stratification height of displacement ventilation system.
     本文根据置换通风系统的工作原理,结合国内外置换通风发展的实际情况,详细研究了置换通风系统的热力分层高度及其影响因素。
短句来源
     This paper demonstrates the thermal stratification and the vertical temperature distribution in a room with the underfloor air supply system,the way to describe and determine the pattern of the vertical temperature gradient and the principles for determining the optimum air flow rate.
     本文阐明了下部送风房间热力分层和垂直温度分布规律,给出了确定垂直温度分布曲线的方法及确定最佳运风量的原理。
短句来源
     In the case of two point sources of plumes with different strengths on the floor in a natural displacement ventilated enclosure, the thermal stratification is developed into three layers with different air densities.
     当自然置换通风的室内(封闭空间)地面上有两个不同强度羽状流浮力源时,热力分层发展成三个不同空气密度的分层。
     It gives some factors affecting thermal stratification height such as inlet temperature, inlet velocity,heat transfer of wall body,distance of heat source and so on.
     (5)拟合了无量纲热力分层高度相应于送风温度T、送风速度V、热源间距离L和围护结构传热Q的经验公式。
短句来源
     Discusses issues in displacement ventilation including the relation of upward air supply and displacement ventilation, prediction of the thermal stratification level, determination of the temperature rises in near floor and working zones, and calculation of the supplied air volume.
     分析讨论了下部送风与置换通风的关系 ,热力分层高度的计算 ,地面空气层温升与工作区温升的确定 ,送风量计算等问题
短句来源
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  温度分层
     Advance of Studying the Laws of Indoor Air Flow's Thermal Stratification Phenomena in Air - conditioned Buildings
     空调建筑室内气流温度分层现象规律的研究进展
短句来源
     Simulation on thermal stratification of the river-like deep reservoir
     河道型深水库的温度分层模拟
短句来源
     The results show that strong thermal stratification exists from April to June for Sanxia reservoir, and the outflow temperature delay is obvious.
     结果显示:三峡水库在4~6月可能存在较为明显的温度分层,下泄水温出现滞温现象。
短句来源
     This study showed that the seasonal thermal stratification, although not strong like typical alpine lakes, could play a key role in change of water quality in canyon-reservoirs.
     在百花湖水库的研究表明,西南地区深水水库,可以在夏季出现一定的水体温度分层结构,并导致显著的水体水化学(如溶解氧)分层,进而影响水库水环境质量.
短句来源
     Accolding to mathematic models and simple models, this paper summarized the methods of studying the laws of indoor air flow's thermal stratification phenomena in air -- conditioned buildings. By analyzing and comparing them, the low Re number Lam -- Bremhorst model was found to be suitable for studying the laws of thermal stratification phenomena.
     从数学模型和简易模型两个方面概述了空调建筑室内气流温度分层现象规律的研究方法,通过分析比较,认为低雷诺数的LB模型适合温度分层现象的研究
短句来源
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  热层结
     If omitting the atmospheric thermal stratification , correcting air pressure, replacing the canopy layer stomatic resistance r c with the canopy integral stomatic resistance r sT, and limiting the net radiation R n with the canopy intercepted net radiation R nl in Penman-Monteith equation, the forestry transpiration in growth season could be calculated continuously with the measured stomatic resistance data and general weather data.
     研究的主要思路是 :如忽略大气热层结问题 ,考虑气压订正 ,并用冠层整体气孔阻力 rs T代换冠层阻力 rc,将蒸散面净辐射限定于冠层截留净辐射 Rnl,便可在林木气孔阻力等实测数据的基础上 ,应用修改后的 Penman- Monteith公式并使用常规气象数据进行生长季林木蒸腾量的连续计算。
短句来源

 

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  thermal stratification
Self-similar thermal stratification regime in vessels with natural convection
      
Effect of thermal stratification on ekman flow stability
      
The determining part played by thermal stratification in the liquid phase is demonstrated.
      
A new procedure is suggested for the calculation of pressure and thermal stratification in a liquid.
      
The results indicate that the thermal stratification causes appreciable differences in the coefficients of turbulent transfer between the active (heat) and passive (mass) scalars.
      
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Under some assumptions the general expression for the wind profile in the earth's surface layer is obtained. The approximate expressions for the cases Ri < 1/2 Ric andRiRicare deduced. The influence of the thermal stratification and wind velocity 011 the wind profile in the earth's surface layer for the former case is studied. Finally, by comparing the present results with the exponential law obtained by Deacon (1949), the relationships between the exponent β, the Richadson no. Ri, and the height are obtained....

Under some assumptions the general expression for the wind profile in the earth's surface layer is obtained. The approximate expressions for the cases Ri < 1/2 Ric andRiRicare deduced. The influence of the thermal stratification and wind velocity 011 the wind profile in the earth's surface layer for the former case is studied. Finally, by comparing the present results with the exponential law obtained by Deacon (1949), the relationships between the exponent β, the Richadson no. Ri, and the height are obtained.

本文在一些假设下,求得贴地层中风速廓线的一般表示式。然后分别求得R_i<1/2R_(ic)和R_i数接近R_(ic)时,贴地层中风速廓线的近似表示式,并在R_i<1/2R_(ic)的情况下讨论温度层结与风速对贴地层中风速廓线的影响。最后将本文得到的风速廓线方程式与Deacon(1949)的风速廓线指数律相比较,则得指数β与R_i数和高度的关系。

In this paper the turbulent exchange in the surface layer of the stable at-mosphere is discussed.Firstly,taking the effect of thermal stratification onturbulence,we derived a new form of the function of Richardson' number fromthe energy balance equation of the turbulent atmosphere.Secondly,we furtherproposed a reasonable function,which describes the vertical distribution ofelements in the stable atmospheric surface layer.Thirdly,we give some graphswhich allow us to calculate accurately and quickly the...

In this paper the turbulent exchange in the surface layer of the stable at-mosphere is discussed.Firstly,taking the effect of thermal stratification onturbulence,we derived a new form of the function of Richardson' number fromthe energy balance equation of the turbulent atmosphere.Secondly,we furtherproposed a reasonable function,which describes the vertical distribution ofelements in the stable atmospheric surface layer.Thirdly,we give some graphswhich allow us to calculate accurately and quickly the turbulent characteristicvalues,such as turbulent austousch based onobserved data.For comparison with others,some calculations based on observed data arefurnished.It shows that our treatment is reasonable and our results arebetter than results.

本文对稳定层结大气中近地层湍流的层结订正函数导出了新的形式.据此而对的湍流普遍函数作出了新的规定.根据该方案对近地层湍流特徵作了若干讨论.最后并绘制了计算近地层湍流特性量的图表,藉此可以很方便而准确地由梯度观测直接估各市地近地层湍流状况.

The characteristics of flow in cooling reservoirs, due to the presence of thermal stratification and the heat exchange on the surface, is far more complicated than that of flow usually encountered in hydraulic engineering. The criteria for similarity of flow in models and prototypes are so numerous that the satisfication of all of them is not practical. The author presented, in 1959, the criteria for similarity with due consideration of the fact that on one hand, they should be sufficient for the reproduction...

The characteristics of flow in cooling reservoirs, due to the presence of thermal stratification and the heat exchange on the surface, is far more complicated than that of flow usually encountered in hydraulic engineering. The criteria for similarity of flow in models and prototypes are so numerous that the satisfication of all of them is not practical. The author presented, in 1959, the criteria for similarity with due consideration of the fact that on one hand, they should be sufficient for the reproduction of main hydraulic and thermal characteristics in models; and on the other hand, it should be practical to satisfy the criteria in ordinary hydraulic laboratories. The similarity laws thus obtained are presented in equation (17). When the room temperature and moisture content can be controlled and adjusted the similarity laws as shown in eq. (13) are recommended. A series of verification tests and field observations were carried out in the following years, the latter being made in two cooling reservoirs. In one of the reservoirs, which has an average water depth of 4.5m and a surface area of 5 km~2, general flow pattern of the surface layer and of the bottom layer of the thermal density current was observed. They were well verified in a model with length scale L_r=250 and depth scale Z_r=40. The other cooling reservoir is a much smaller one, with surface area of only 9000 m~2 and an average water depth of 2.5m. Besides flow characteristics, the variation of the temperature field of the reservoir and of the total heat balance with respect to time were carefully measured. A model with L_r=15 and Z_r=6 served to verify the hydraulic and thermodynamic data obtained in the field. The paper is a collective report, including the derivation of the similarity law and its verifications, and a discussion of the scale effects.

冷却池中的水流运动,由于存在着水流本身的溫差作用及池面的散热受热作用,其运动規律,要較一般水流运动規律复杂得多;其模型相似条件,亦极难全面滿足,本文从整个水池的基本相似要求出发,着重考虑了水面溫度場相似的要求,提出了模型律;对存在着的比尺矛盾作了一些探討,并在室內和現場作了一些試驗驗証。几年来的試驗实践說明,虽然目前的模型相似問題,还有不少环节沒有解决,直接用热水作为試驗介貭的模型試驗,不失为規划冷却池工程布置和估計水面散热能力的一种有效工具。

 
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