查询词典 airflow

A term is added to account for the effect of airflow through the slots on the air damping of the plate. The end effect of the airflow in the slots is also treated by substituting an effective channel length for the geometric channel length (i. e. the thickness of the plate).

该方程与传统雷诺方程的区别是在雷诺方程的左边增加了一个用以表示气体从槽流出所引起的阻尼效应的修正项，并考虑了槽中有限气流通道长度的端头修正。

The main work and the originality points of this dissertation could be concluded as the following parts:(1) To analyze systematically the mathematical model of LES of air flow in great space, under the case of isothermal and non-isothermal, as well as the combined action of buoyancy and strain. Some basic problems are studied about the LES application into airflow simulation of great space, such as boundary conditions, spatial difference scheme and time advancing scheme, time step etc., which creates the basis for the LES application to indoor airflow simulation.(2) Both the instantaneous and time averaged flow field of great space with multiple jets under isothermal and non-isothermal cases are explored with large eddy simulation method, and also discussed the dynamic characteristics and the law of fluidflow in the great space.(3) Based on the results of LES of the great space and the Fanger thermal comfort indexes, it is brought forward the concept of the series of dynamic thermal comfort evaluating indexes, which could be divided into thermal comfort index with time averaged properties PD, PPD, PMV, thermal comfort index with instantaneous properties IPD, IPPD, IPMV, and time averaged thermal comfort indexes TAPD, TAPPD, TAPMV, and transient situations time averaged thermal comfort indexes TTAPD, TTAPPD, TTAPMV. The differences among them and the calculation methods are discussed, and the four kinds of indexes are calculated with the thermal comfort index PD as an example.(4) Based on the LES results it is discussed the hot air stratification phenomena in air-conditioned buildings in the case with air supply and return registers on the ceiling and the case on the sidewall. The fundamentals of the hot air stratification are studied and the relations of estimating hot air stratification are brought forward.(5) With the advanced apparatus such as hot wire film anemometer IFA300 and laser particle field anemoscope, corresponding model test and site measurements have been done, which are compared with the simulation results and LES is proved a very promising method in air flow simulation indoor.

本文主要工作既创新点体现在以下几个方面：(1)系统分析了等温、非等温和考虑剪切力与浮升力综合作用的高大空间大涡模拟数学模型，并研究了高大空间大涡模拟在室内气流仿真应用中的一些基本问题，如边界条件、空间离散格式和时间推进格式、时间步长选择等问题，为大涡模拟在室内气流计算中的广泛应用打下了基础；(2)首次用大涡模拟方法研究了高雷诺数下高大空间多射流在等温、非等温情况下的瞬时流场和时均流场分布，并探讨了多射流流场的动态特性和流动规律；(3)基于大涡模拟的动态仿真结果和Fanger的热舒适指标，首次系统地提出了动态热舒适评价指标体系的概念：即基于时间平均参数的热舒适指标PD、PPD、PMV；基于瞬时参数的瞬时热指标IPD、IPPD、IPMV；基于时间平均热舒适指标TAPD、TAPPD、TAPMV；以及沿行动迹线的时间平均热舒适指标TTAPD、TTAPPD、TTAPMV，并分析了四类热舒适指标的差异性和计算方法，还以PD值为例对四类指标分别进行了计算；(4)基于数十种工况下空调房间大涡模拟的结果，研究了空调建筑上送上回和侧送侧回两种情况下热分层现象，并探讨了热分层的基本规律，首次提出了避免热分层现象的判断公式；(5)在暖通空调领域，首次使用IFA300热线风速仪、激光粒子速度场仪等先进设备，完成了与大涡模拟相对应的模型试验，并把实测结果与仿真结果进行了对比，说明LES在室内气流仿真方面是一种很有前景的方法。

On the basis of a great deal of the experimental data processing and analysis, the combustion converted account reaction rate constant, the unstable heat-exchange coefficient variation law between the airflow and the roadway rock and the codomain determined under different fire conditions have been provided with the correctness of the theoretical calculation formula for description of the airflow energy loss of the fire area tested and verified, a large number of the basic data concerning mine fires obtained.

通过大量实验数据的整理分析，给出了矿井火灾时期燃烧折算反应速率常数、风流与巷道岩石间的不稳定换热系数的变化规律及不同火灾条件下的取值范围，验证了火区风流能量损失理论计算式的正确性，并获得了大量的矿井火灾基础数据。

The law of airflow in areas such as taker-in, front upper plate of taker-in and flat, and between cylinder and doffer, as well as the influence of the airflow in these parts on fabric transfer, is analyzed.

分析了刺辊部分、锡林与盖板部分前上罩板、锡林与道夫间气流运动的规律，以及上述气流对梳理过程中纤维转移的影响。

The results show that airflow and temperature distributing are the best in the lower berth area,second in the hit berth,and the worst in the upper berth;the nearer from door,the better the distributing of airflow and temperature,the temperature in doss area is lower than that in aisle area.

研究结果表明：下铺区域的气流组织及温度分布较好，其次是中铺，上铺区域的气流组织及温度分布较差；距车门越近，气流组织越好，车厢中部区域的气流组织最差；床铺区域的空气温度较走廊区域的空气温度低。

The air purifier 10 may be constructed without inclusion of the ionizer needle 34 or may include more than one ionizer needle within the airflow path to charge particles that proceed along the airflow path.

空气清洁器10可以被构造为不包括电离子针34或在气流通路内包括多于一个的电离子针，以便向沿气流通路前进的微粒提供电荷。

Methods Based on the results of numerical simulation of airflow in nasal cavity and the data obtained from Rhinomanometry, the characters of airflow in the middle nasal meatus were acquired.

方法根据重建的三维鼻腔模型进行数值模拟的结果和鼻阻力仪测量的结果得到窦口鼻道复合体处的气流流动情况，以此作为依据，设置合理的边界条件。

Airflow from the transom window takes a big share in overall greenhouse ventilation, and it extends to most area, especially the upper part and most of the down part of the greenhouse. More airflow concentrates around lean-to transom window areas, while the overall airflow is comparatively even.

顶窗通风量占整个温室通风的比例较大，从顶窗进入的气流遍及几乎整个温室上部和大部分下部空间，气流运动在顶窗开向侧比较集中，但总体运动比较均匀。

The influential systems of irregular airflow pattern are shear line,low vortex and small slot near the east of Qinghai-Xizang plateau, vertical ascending motion is stong,mesoscale feature is obvious. There are two vapor transportation passages,one is warm southwest airflow from Bay of Bengal along the south of Himalayas to Longnan. The airflow from the East China Sea and South Sea meet in south China ,then toward Longnan.

不规则型暴雨主要的影响系统有高原东侧切变、高原低涡和短波槽，垂直上升运动比较强烈，中尺度特征明显；水汽来源主要有两支，一支是从孟加拉湾地区沿高原南侧北上的西南暖湿气流，另一支来自我国东海和南海，在华南汇集后转向，然后北上到陇南地区，有较强的能量锋区和明显的锋生。

There are two layers of adjustable shifting vanes in the double layered shutter inlet port The short one is used to adjust the angle of flare of the blowing airflow and to shift the direction of the airflow while adjusting the long one can make the blowing airflow affix the ceiling joist or descend at an angle.

双层百叶风口有两层可调节角度的活动叶片，短叶片用于调节送风气流的扩散角，也可用于改变气流的方向；而调节长叶片可以使送风气流贴附顶棚或下倾一定的角度。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。