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双语推荐：百叶窗

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百叶窗翅片广泛应用在紧凑式换热器中,基于传统矩形百叶窗结构,提出两种新型矩/梭形百叶窗翅片,利用FLUENT软件对不同结构的百叶窗翅片流场、温度场进行模拟分析,对比不同结构百叶窗翅片的传热和阻力特性。研究表明,由于流道变截面的影响,使得梭形百叶窗和矩/梭形百叶窗有较高流速的流体冲刷加热管壁面,从而梭形百叶窗和矩/梭形百叶窗传热效果增强,其综合性能均优于矩形百叶窗,矩/梭(2/1)形百叶窗传热j因子相对较高,综合性能较好。
Louvered fins are widely used in compact heat exchangers.Two kinds of louvers were proposed based the traditional rectangle louver.The flow field and thermal field of louvered fins are simulated by sofeware FLUENT.The characteristics of heat transfer and resistance are compared to different kinds of louvers.Due to the changed flow sections,the spindle louver and rectangle/spindle louver have higher flow velocity near the heated tube wall,the heat transfer is enhanced and comprehensive performance is better than reactangle louver.The j factor of rectangule/spindle (2/1 )louver is highest and the compre-hensive performance is best.

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遮阳百叶窗是实现建筑节能的有效措施之一。针对现有百叶窗的局限性进行改进,设计出一种能够更好兼顾遮阳和通风的旋转可调式新型百叶窗,通过与传统百叶窗的对比实验测试,分析得到了新型百叶窗对室内太阳辐射量和通风量的影响。实验测试表明,控制一定的通风量时,采用旋转可调式百叶窗其室内辐射得热量最大可减小75%;控制一定的辐射量时,采用旋转可调式百叶窗室内通风量可比传统百叶窗增加30%以上。综合分析表明,旋转可调式百叶窗对于减少室内太阳辐射,增大室内通风量效果显著。
Window-blinds system is one of the effective measures for building energy efficiency. In the light of the limitation of the existing blinds, designed a new rotary adjustable blinds system, which is able to balance shading and ventilation better. From the contrast experiment on the new blinds and the traditional one, analyze the effects of new blinds on indoor solar radiation and ventilation rate. Experimental results show that, controlling a certain rate of ventilation, the indoor radiation heat gain can be decreased by 75%when using the rotary adjustable blinds;controlling a certain amount of radiation, the ventilation quantity can reach more than 30%of traditional blinds. Comprehensive analysis shows that, to reduce indoor solar radiation and increase indoor ventilation, the effect of new rotary adjustable blinds is remarkable.

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研制了链牵引式外遮阳百叶窗,设计了百叶翻转机构及升降机构,可以调整叶片角度,实现叶片上卷或下放.计算百叶窗的综合遮阳系数,确定了其遮阳性能等级为5级.以上海地区为例,利用DeST-h分析了百叶窗对建筑能耗的影响,结果表明,采用百叶窗较无遮阳及水平遮阳板两种方式,冷负荷分别减少180.55,kW·h和62.95,kW·h.利用SolidWorks对叶片结构进行了静态仿真模拟,结果表明,叶片的抗风压强度在合理范围内.
External shading blind with chain traction was developed. Louver flipping mechanism and lifting mechanism were designed. It can adjust the shutter angles to make the louvers roll up or down. The comprehensive shading coefficient was calculated to determine its shading performance,which is at the fifth level. In Shanghai,the blind’s effect on building energy consumption was analyzed with DeST-h. The results show that,compared with no shade and horizontal sun visor,the cooling load decreased by 180.55,kW·h and 62.95,kW·h respectively. The louver’s structure was statically simulated with SolidWorks. The result shows that the wind pressure-resistance strength of the louver is in a reasonable range.

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建立了多元微通道平行流冷凝器的稳态分布参数模型,与实验对比验证了模型的正确性。利用所建立的模型,研究了翅片高度、翅片间距、百叶窗开窗间距、百叶窗开窗角度变化对多元微通道平行流冷凝器传热和流动性能的影响。结果表明,随着翅片高度的增大,换热量逐渐增大,空气侧压降逐渐减小;随着翅片间距或者百叶窗开窗间距的增大,换热量和空气侧压降都是逐渐减小;随着百叶窗开窗角度的增大,换热量和空气侧压降都是逐渐增大。
The theoretical model of the multiple micro_channel parallel flow condenser is established based on the method of distribution parameters, and validity of the model is verified by comparison with the experimental data.Based on this model, the effects of fin height, fin pitch, louver pitch and louver angle on the heat transfer and flow performance of multiple micro_channel parallel flow condenser are in_vestigated.The results show that, as increasing of fin height, the heat transfer rate increases, but the air_side pressure drop decreases;when fin pitch increases, or louver pitch increases, the heat transfer rate and air_side pressure drop all decrease; as increasing of louver angle, the heat transfer rate and air_side pressure drop all increase.

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提出了一种可改善换热效率的百叶窗式纵翅片换热管的结构模型,对其进行简化,采用Fluent软件对换热管烟气侧流动与传热过程进行数值模拟,对比了两种百叶窗纵翅片与普通纵翅片的换热效率与压降,结果发现:百叶窗式纵翅片传热效果比普通纵翅片高130%以上。模拟了6组不同流体入口速度下传热与压降的变化情况,分析了百叶窗翅片间距与倾斜角度对传热与压降的影响,结果表明:入口速度越大,进出口温差越小,压降越大;翅片间距越大,进出口温差和压降都越小;翅片倾斜角度越大,换热效果相差不大,压降越大。搭建了简易实验平台对模拟结果进行验证。
Longitudinal finned tube heat exchanger is a new type of tube heat exchanger used in flue gas heat recovery. In order to improve the heat transfer efficiency,the structural model of a new type of longitudinal louvered fin tubes was proposed and simplified. Using Fluent Software,the process of flow and heat transfer in gas phase was simulated for the longitudinal louver fined heat exchangers,and the transfer efficiency and pressure drop of two types of longitudinal louver fin and the common type exchanger were compared. The results showed that the heat transfer efficiency of longitudinal louvered fin heat transfer were over 130% higher than that of the common type. This paper simulates the changes of transfer and pressure drop at six different inlet velocities,and analyzed the influences of heat transfer and pressure drop caused by the difference of spacing and inclination angles on longitudinal louver fin. The results showed that at higher inlet velocities, the range of temperature was

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660MW间接空冷机组能够利用空冷塔对三角百叶窗的开度进行自动控制，保证空冷塔每一个扇区中的出水温度都处在合理的范围之内，并且在遇到极端恶劣天气的时候，能够对容易受冻的百叶窗的开度进行特殊的控制，确保间接空冷机组设备具备的自动化控制性能可以使人们安全、平稳地度过冬季。
660 MW indirect air cooling unit can take advantage of the opening of the cooling tower triangulation shutters automatically controlled to ensure every sector of cooling tower water temperature are within the reasonable range, and in the face of extreme bad weather, capable of opening of the shutters easy cold special controls to ensure that indirect air cooling unit equipment with automatic control performance can make people safe, stable place to spend the winter.

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通过应用实例介绍了机舱通风系统的设计过程,包括机舱通风量计算、管路布置、风口等附件以及百叶窗控制系统等设计方法。
This paper introduces the design procedures of engine room ventilation system through examples, including engine room ventilation quantity calculation, pipeline arrangement, air duct and other accessories, as well as the flap control system design method.

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对散热器空气侧的百叶窗翅片建立三维流固耦合的模型,运用Laminar方法进行数值模拟,结果表明传热与压降特性与实验关联式吻合较好,模型得以验证;为进一步阐明汽车内散热器空气侧的强化传热翅片的性能,分别考察了不同的翅片高度、窗翅高度、翅片厚度和翅片节距等结构参数对传热系数和压降的影响,得到了一组综合性能较好的百叶窗翅片结构参数。
A three dimensional fluid-solid interaction model is established for the radiator shutter , and numerical simulation of heat transfer and fluid flow characteristics is conducted in air side of the radiator by Laminar model .It is found that the heat transfer and friction performance have good agreement with the correlations in the literatures , so the model is verified correctly;To further clarify the performance of louvered fin in the air side , fin height, louver height, fin thickness and fin pitch are changed to obtain the relationship between the parameters and the characteristics of heat transfer and pressure drop of louvered fin , and it is obtained that a group of structural parameters of louvered fin , the comprehensive performance of which is better .

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百叶窗煤粉浓缩器作为水平浓淡燃烧技术的关键部件已在电站锅炉中得到了广泛应用。为深入研究流场结构对百叶窗煤粉浓缩器性能的影响,采用激光片光系统对百叶窗煤粉浓缩器内的流场结构进行了实验研究,获得了浓缩器内全流场信息。实验结果表明,被叶片浓缩下来的颗粒流冲击到浓侧壁面,将导致浓侧出口壁面的磨损;在浓缩器出口设置适当长度的挡板将有助于避免浓淡2股气流的过早混合;叶片前端浓度的差异导致各级叶片磨损特点不同,实际应用中需要分别考虑各级叶片的防磨措施;可通过调节叶片间距来改变进入淡侧的粉量,从而改进浓缩器的性能。
As a key part of the horizontal bias combustion (HBC) technology, the louver coal concentrator (LCC) has been developed and successfully applied to many large-scale utility boilers. To further study the effect of the flow field structure on performance of LCC, the experimental study on flow field structure was carried out using a laser sheet system, and the full-field images were obtained. The results show that the wall near the fuel-rich side is abraded by the particles which are enriched down by the blades. Thus the division plate with proper size can be put in the exit of the LCC in order to avoid the early mix of the fuel-rich and fuel-lean airflow. The different concentration in the front of the blade varies abrasion characteristics, thus the anti-abrasion of the each blade should be considered respectively in practical application. The amount of powder in fuel-lean side is changed by adjusting the space of the blades in order to improve the performance of the concentrator.

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本文对空调器中常用的百叶窗翅片的阻力和换热特性进行了三维数值模拟,仿真结果与实验测试的数据基本吻合。同时对另一种桥片翅片的性能进行了仿真预测,与窗片对比,桥片的阻力更小但是其换热性能不如窗片。
In this paper, the resistance and heat transfer characteristics of louvered-fin which was used extensively in air conditioner is analyzed with three-dimensional numerical simulation. The theoretical analysis result is almost consistent with experiment. In additional, the characteristic of another bridge fin is evaluated with simulation. The resistance coefficient of bridge fin is less than that of louvered fin, but has no advantage of heat transfer characteristics than louvered fin.

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