上回

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。

If I were you, I'd go back at once.

我是你的话，我就马上回

"I did not got any money out, I'll get back to the shop."

"我没有带钱出来，我马上回店里取。"

I'll ask him to return your call right away.

好，我会请他马上回你电话。

If it's Mary,tell her I'll call her right back.

如果是玛丽，跟她说我马上回她电话。

A 12 centime diameter (around 4 3/4 inches) disk containing digital audio or digital computer information, which can be played back and on a laser-equipped player.

光盘。一张直径 12 厘米(大约 4 3/4 英寸)的磁盘可以用来存储数据音频或数字计算机信息，在激光播放机上回放并且。

Last time it took me one hour to chip out.

上回我花了一小时才弄干净的

I started up in the greatest hast imaginable, and in a trice clapt my Ladder to the middle Place of the Rock, and pull'd it after me, and mounting it the second Time, got to the Top of the Hill, the very Moment, that a Flash of Fire bid me listen for a second Gun, which accordingly, in about half a Minute I heard; and by the sound, knew that it was from that Part of the Sea where I was driven down the Current in my Boat.

听到枪声后，我一跃而起，转眼之间就把梯子竖在半山上，登上半山的坡坎后，又把梯子提起来架在坡坎上，最后爬上了山顶。就在这一刹那，我又看见火光一闪，知道第二枪又要响了；果然不出所料，半分钟之后，又听到了枪声。从那声音判断，知道枪声正是从我上回坐船被急流冲走的那一带海上传来的。

When did you do cleanup for it last time?

你上回打扫房子是什么时候哇？

The retired Formula One World Champion did something unexpected on the way back to the airport after a trip out to the village of Gehuelz, near Coburg in southern Germany, left the family short of time to make their flight back to Switzerland.

在前往南德科堡附近的格胡兹镇后，回程因为快赶不上回瑞士的飞机，已退休的F1赛车世界冠军做了一件意想不到的事。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了