The content of this paper includes the momentum ? blade element theory and cfd method which are both used to compute the aerodynamic characteristics of cooling fans 本文分别利用结合动量?叶素理论的经典计算方法和cfd方法计算不同型号的汽车冷却风扇的流场和气动特性,并进行比较。
After posting nt $ 80 million in bail on may 20 , former procomp informatics chairwoman ye su - fei was released from prison and assumed her former position in the company less than two months later 这是叶素菲，今年五月20号，在以八千万获得交保后，不到两个月，回锅再接博达董事长职务。
Methods : 66 patients with evvh were divided into three groups : combined treatment group ( stilamin combined with pituitrin ) , stilamin group , and pituitrin group among which contrast study was carried out 方法：将66例食管静脉曲张破裂出血患者分为联合用药组、施他宁组及垂体后叶素组分别治疗，进行对照研究。
Combined with blade element theory , the results can be used to evaluate aerodynamic characteristics of flapping wings , which are helpful for the initial design of micro rotary and flapping wing 运用本文方法分析了各参数对翼型气动特性的影响，进一步结合叶素理论还可以估算扑翼的气动特性，进而指导微旋翼或扑翼微型飞行器的初期设计。
Since it is the first use of the momentum - blade theory to predict cooling fan aerodynamic performance , the work presented in this paper is still open for further investigation 但由于本文使用的将动量?叶素理论运用到汽车冷却风扇这种小展弦比的叶片的气动计算上,尚属首次,对于结果中存在的偏差的确切原因,尚有待于在今后的工作中继续研究。
In the present work , there are two methods to design the shrouded - propeller . one is based on the blade element and momentum theory , the other is based on the ufbng - line ( surface ) theory derived from circumfluence theory 在实际工作中，函道螺旋桨的设计有两种方法，一种是基于叶素理论与动量定理的工程方法；另一种是基于升力线(面)方法的环流理论方法。
The modified momentum - blade theory is used in the theory calculation method , to get the result of forces , moment , power , flow flux and other parameters . the cfd software fluent is then applied to carry out the numerical simulation of flows around cooling fans with 3d meshes . the experimental results for several typical fans are analyzed and discussed as well in this paper , providing a sound ground for fan design and aerodynamic parametric analysis 首先根据经典设计方法,糅合动量?叶素理论,用fortran语言自编程序,计算风扇的气动力和力矩,得出速度、流量、功率等结果;然后利用商用计算流体力学软件fluent和三维网格生成软件gambit进行风扇的数值模拟计算,分析其流场的气动特性;本研究还对风扇的风道实验数据进行了分析讨论,为风扇的气动设计和参数分析打下基础。
Finally , the results from the two different calculation methods of the momentum ? blade element theory and the cfd are compared with the experimental data , indicating that the results from the momentum ? blade element theory with certain correction compare well in general with the experimental data , and that the cfd results are also in agreement with the experiment to some extent 最后,本文将风扇在不同转速下的两种计算方法得出的结果与实验数据作了比较,结果表明,结合动量?叶素理论的经典计算方法得到的结果通过一定的修正,总体上与实验结果吻合得较好;用fluent计算得到的结果与实验数据相比,基本上也很接近。
Gingko leaf tea , yellow and green luster , taste bitter , and then sweet , enjoy the clear clean taste . the tea also contains various efficacious elements , and so on . the special tea serves nutrient and medicinal purposes . at the same time , the tea adjust cholesteroll level , having curative properties to vessel disease 银杏叶素茶，色泽黄绿，入口略苦，而后甘甜，回味清香，并且含有多种有效成份，具有很高的药用价值和营养价值，对人体能调节血脂，对心脑血管疾病由更好疗效。
The result of computer and analysis based on blade elements theory shows us that we can regulate the rotate speed of wind turbine rotor by changing set angle and pitch h . variable - pitch system is the key component of the whole wind turbine , which can assure safely pitch - control and brake 本文利用叶素理论，经计算分析得出：通过改变风力机安装角可以改变桨距h ，从而改变风力机的转速。变距机构是变桨距控制型风电机组实现变距控制和安全刹车的关键机构之一，它的运动由平动和转动两部分组成。
