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全部话题 - 话题: airflow
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x********u
发帖数: 1164
1
来自主题: NextGeneration版 - 美妈们哪里有卖吸汗枕头呢?
你确定她不是热吗?我一般用一条大浴巾对折两下垫下面,枕头最好不要用。另外推荐
一个透气的垫子,你可以试试。http://www.amazon.com/Naturepedic-Waterproof-Airflow-Mattress-Topper/dp/B004U47XEI/ref=sr_1_17?ie=UTF8&qid=1380684702&sr=8-17&keywords=crib+mattress+pad
s******n
发帖数: 117
2
来自主题: Parenting版 - 小儿喘息咳嗽复发的问题
Sorry I can't type Chinese at office. Here is Wikipedia definition for
wheezing:
A wheeze (formally called "sibilant rhonchi" in medical terminology) is a
continuous, coarse, whistling sound produced in the respiratory airways
during breathing. For wheezes to occur, some part of the respiratory tree
must be narrowed or obstructed, or airflow velocity within the respiratory
tree must be heightened. Wheezing is commonly experienced by persons with a
lung disease; the most common cause of recurrent... 阅读全帖
c****g
发帖数: 19
3
来自主题: Postdoc版 - electrospinning equipment
Depends on your research. Recommend to assemble one.
Usually, you just need a high voltage power supply, syringe pump, some
needle tips (Flat tip preferred), syringe. You can also make a clear chamber
to prevent yourself from nanofibers (also reduce the airflow). You can
order all the above from VWR.

buy
m*********h
发帖数: 5449
4
来自主题: Stock版 - 穷人买不起的炒股PC配置
CPU: Intel Core i7-4790K Processor, $330, 买不起
Motherboard: ASUS MAXIMUS VII HERO ATX DDR3 2600 LGA 1150 Motherboards
MAXIMUS VII HERO, $212, 买不起
Memory: Corsair Dominator Platinum 32GB (4x8GB) DDR3 2400 MHz (PC3-19200)
Desktop Memory, $590, 买不起
Case: Cooler Master HAF X - Full Tower Computer Case with High Airflow
Windowed Side Panel and USB 3.0, $160, 买不起
Power: Corsair CX Series 750 Watt ATX/EPS Modular 80 PLUS Bronze ATX12V/
EPS12V 744 Power Supply CX750M, $79, :(
CPU Cooling: Corsair Hydro S... 阅读全帖
m*e
发帖数: 188
5
TEMPUR® pressure-relieving material
* One Approx. 0.8" TEMPUR Comfort Layer (5.3 lbs./ft. density) — Softer
formula for enhanced responsiveness
* One Approx. 2.8" TEMPUR Support Layer (5.3 lbs./ft. density)
* Edge to edge, pressure-relieving comfort and therapeutic support for
deep, rejuvenating sleep
Base layer
* One Approx. 5" AirFlow System™ Base Layer
* Provides support to TEMPUR layers and increases air circulation
总共是0.8"+2.8"+5"厚
每层得软硬度不同
我是因为本身背不太好,所以才买这个的,
s**********3
发帖数: 102
6
APC NetworkAIR 1000 Portable A/C - Used and working - $100
Model: AP7003
7,000 BTU
Condensate tank 3.5qt
Physical dimensions 12.85 x 16.250x30.75 in
Net weight: 74lbs
Airflow 170 CFM
Sound level: 51.5dB
Dehumidifier value: .26 gal/hr max
http://boston.craigslist.org/nwb/app/1840313990.html
b****b
发帖数: 665
7
来自主题: Boston版 - 买了抽油烟机了
$250, New, free shipping to house. 加上用了朋友告诉的 discover card 网上购
物有 5% cash back.
我的Point是: 反正我家里已经4年没有用抽油烟机都过来了,这次装个便宜的就行了
。总比没有好。另外,就是要求: 不锈钢,900cfm.加上有 5 年的warranty。
本来想买神器一代,想来想去,还是贵!这个油烟机,ebay 上有一些dealer,我找了
个review最多的。等东西装好后,我再来写个心得。
http://www.ebay.com/itm/110932281595?ssPageName=STRK:MEWNX:IT&_
UNDER CABINET RANGE HOOD 30"
w/ Auto Clean System

Airflow at Max: 900 CFM
Noise Level: Low speed: 46dBA Max speed: 64dBA

Motor: Twin Motors &Twin Blowers

Speeds: 1250rpm

K... 阅读全帖
b****b
发帖数: 665
8
来自主题: Boston版 - 买了抽油烟机了
$250, New, free shipping to house. 加上用了朋友告诉的 discover card 网上购
物有 5% cash back.
我的Point是: 反正我家里已经4年没有用抽油烟机都过来了,这次装个便宜的就行了
。总比没有好。另外,就是要求: 不锈钢,900cfm.加上有 5 年的warranty。
本来想买神器一代,想来想去,还是贵!这个油烟机,ebay 上有一些dealer,我找了
个review最多的。等东西装好后,我再来写个心得。
http://www.ebay.com/itm/110932281595?ssPageName=STRK:MEWNX:IT&_
UNDER CABINET RANGE HOOD 30"
w/ Auto Clean System

Airflow at Max: 900 CFM
Noise Level: Low speed: 46dBA Max speed: 64dBA

Motor: Twin Motors &Twin Blowers

Speeds: 1250rpm

K... 阅读全帖
d****m
发帖数: 119
9
读code,还是dealer那里靠谱。 俺第一台车,97ford probe, engine check 亮了3个
月,autozone去过了,local mechanics去过了,都没搞定,后来花了75在dealer那里
读code, 需要换2个o2sensor, 一个mass airflow sensor, dealer charge 800, 自己
花170在autozone 买了都自己换上了,就没事了,MPG jumped to 38. hoho
d****m
发帖数: 119
10
读code,还是dealer那里靠谱。 俺第一台车,97ford probe, engine check 亮了3个
月,autozone去过了,local mechanics去过了,都没搞定,后来花了75在dealer那里
读code, 需要换2个o2sensor, 一个mass airflow sensor, dealer charge 800, 自己
花170在autozone 买了都自己换上了,就没事了,MPG jumped to 38. hoho
h******d
发帖数: 4761
11
来自主题: LosAngeles版 - 请教爬山的高手!
30% Nylon, 25% AirGoTex, 20% Viscose, 12% Mythlan, 10% Angora, 3%
Elastane
Air Conditioning Channel is a system made of finely woven knitmesh that
continually circulates air. Located along the inside of the foot it ensures
that every movement of the foot pumps the moist, warm air out of even tight
fitting shoes.
Traverse AirFlow Channel System offers lateral ventilation under the
foot, while the AirCool Stripes allows cool, fresh air to circulate along
the instep
Anatomically sha... 阅读全帖
J******h
发帖数: 6102
12
来自主题: LosAngeles版 - 一个Hiker 摔死了
其实睡觉也很危险的:
http://besthealthnewsonline.com/can-someone-really-died-in-slee
Sleep apnea (or sleep apnoea in British English; English pronunciation: /&#
230;pˈniːə/) is a sleep disorder characterized by abnormal
pauses in breathing or instances of abnormally low breathing, during sleep.
Each pause in breathing, called an apnea, can last from a few seconds to
minutes, and may occur 5 to 30 times or more an hour.[1] Similarly, each
abnormally low breathing event is called a hypopnea. ... 阅读全帖
C*******l
发帖数: 105
13
来自主题: NewYork版 - 卖椅子
Your chair is crap does not necessarily mean mine is too.
http://www.staples.com/Global-Airflow-Leather-Seat-with-Mesh-Back-Chair/product_492943
j**********g
发帖数: 8
14
来自主题: Badminton版 - 大侠给推荐个球拍吧
本人女生,力量不是很大,个字不是很高,算介于初级和中级之间的水平。
想买个牌子,100以内吧,尽量80以内。
在考虑这几个:
ProKennex TriFlex 6666 Badminton Racket
Victor Beryllium 3500 Badminton Racket
Head Airflow 5 Badminton Racket
Yonex MP45
最后问个弱弱的问题,87g和80g区别大么? Head拍子好么?
多谢了~~ 我已经查了一下午了...崩溃边缘
j**********g
发帖数: 8
15
来自主题: Badminton版 - 大侠给推荐个球拍吧
多谢多谢~~
我就是平时锻炼身体,撑死算个中级水平。 前一阵一直借别人牌子,弄得手腕很疼...
所以考虑买个轻的。
只是稍微...有点贵啊,那个80g的head airflow...
c*****r
发帖数: 2426
16
来自主题: Badminton版 - 大侠给推荐个球拍吧
HEAD airflow 我们这有个mm在用,感觉并不好,中杆很硬,虽然只有80g但头相当重,
整体性能很诡异,对女生来说打后场球比较费力打网前又不够轻巧,我私人以为不是一
款值得投资的拍子。

..
b*****z
发帖数: 757
17
来自主题: Badminton版 - 请推荐个球拍,女生用
arc9 100刀拿不下来吧,而且没有4u,中杆相当硬,整体也比较重。
head matallix 8000,airflow 5, Dunlop aerogel 5000,都还不错(badminton.net)
更便宜的,可以试试apacs的拍子,apacscanada.com。apacs 的edgesaber 10 评价相当不错。我用过nano
power 900,也挺好,就是稍重了点。
C*L
发帖数: 615
18
来自主题: Badminton版 - 求推荐羽毛球拍,
$30的球拍真的不知道推荐什么好。如果你真的要投入羽毛球这项运动的话,我会推荐
你买一块好一点的。因为我相信玩久了,技术好了,你就会换拍子。我现在有一块蛮好
用的一块,牌子是HEAD,型号的airflow 5,这块拍子不重,牌面算是宽,还有这个牌子
的磅数可以拉的比较高,当然你不用拉的很好,适合就可以了,价钱是$100左右。
s******n
发帖数: 368
19
我现在用的是Head airflow,打算买一支Yonex的,这三种哪种好?以前看见有人推荐
9900,不知和这三种比有什么区别?谢谢!
r********y
发帖数: 2540
20
来自主题: Badminton版 - 求推荐中杆软一点的拍子
Head airflow 5, $70。重量只有80g,中杆软
M***y
发帖数: 2252
21
来自主题: Fitness版 - 划船器锻炼有啥说法没有,
调到最大当然只有10分钟可玩了
http://concept2.co.uk/rower/air_resistance
Resistance on the Indoor Rower is adjusted by means of a damper lever on the
side of the flywheel. Offering a wide range of resistance the damper lever
increases or decreases the amount of air flow into the flywheel. The greater
the airflow (damper setting 10), the greater the resistance and vice versa.
Unfortunately some people confuse the damper settings with the value of the
workout or their own fitness level. Here we try to dispel so... 阅读全帖
w*f
发帖数: 27
22
来自主题: GunsAndGears版 - 空包弹问题
with the adapter, the empty shells of the blank rounds can be ejected.
I think those adapters can last a very long time. It just restricts airflow
at the muzzle
a***a
发帖数: 8941
23
来自主题: GunsAndGears版 - 我靠,悲剧了,郁闷啊, 郁闷啊
I put it on the desk of study room.
Not much airflow.
The desk is strong enough.
The machine could not be so sensitive. If it is so sensitive, it must be
something wrong.
M********o
发帖数: 47
24
来自主题: Racing版 - 晒晒装备,hehe
最喜欢OMP,所以基本都是OMP的装备。
Helmet: Pyrotect Pro Airflow Carbon Fiber
Balaclava: OMP Nomex, Sparco Coolmax
Sunglasses: Oakley Flak Jacket XLJ
Suit: OMP Tecnica Light 3 layers Nomex, Bell Racing 3 layers Nomex
Gloves: OMP Professional Racing
Socks: OMP Nomex
Boots: Bell Vision
j*r
发帖数: 299
25
来自主题: Running版 - 给大家推荐个腰带
看到有人说跑步的时候把手机绑在手臂上不舒服,给大家推荐个腰带。
跑步的时候可以装手机,零钱,钥匙,跑起来一点感觉也没有。
去年一个人背包去泰国,觉得这个贴身装钱和护照什么的也很安全。
我是在ebay上买的,只要5刀。用了两年多了,太好用了。
REI 上也有卖,但是比较贵:
http://www.rei.com/product/798346/amphipod-airflow-microstretch
ebay 上随便找了个链接:
http://www.ebay.com/itm/Sport-Runner-Fanny-Pack-belly-Waist-Bum
S*********u
发帖数: 980
26
如果想入一个便宜点的话 可以考虑这个
http://www.amazon.com/NYKO-TECHNOLOGIES-80650-Airflow-Controller/dp/B0006NGY9C/ref=sr_1_1?ie=UTF8&qid=1293002536&sr=8-1
这个手柄长的比较丑 但是自带风扇 玩久了手心出汗 吹吹还是很舒服的 而且价格便宜
自带改键的软件 我用着觉得还不错
C*******3
发帖数: 576
27
来自主题: PhotoGear版 - Polariod色调居然这么NB!
确切说:airflow controller...:)
我对偶像追踪很仔细~~:)
a******o
发帖数: 16625
28
【 以下文字转载自 Military 讨论区 】
发信人: LindaLiao (梅影清吟), 信区: Military
标 题: 世界历史上最有成就的五十名物理学家。
发信站: BBS 未名空间站 (Sun Apr 8 17:18:35 2012, 美东)
1. Isaac Newton - English. Quantified and Qualified laws of motion and
gravity. Invented the reflecting telescope. Explained the concept of light
dispersion and co-invented the Calculus.
2. Albert Einstein - German/Swiss/American - Developed Theories of Special
and General Relativity. Described Brownian Motion. Nobel Prize winner for
his work on the photoelectric ef... 阅读全帖
d****n
发帖数: 12461
29
来自主题: Hardware版 - 又买了两个风扇
看到一个评价,是那个带架子的:
“The special frame has an incorporated vibration reduction suspensors. At
full speed the motor noise is quite low, but performance/noise balance is
far from ideal, at 1500rpm there’s a lot of airflow but you do hear this
fan running. When undervolting the motor noise becomes more noticeable,
running at 5v does put the performance/noise balance close to average, the
motor noise however spoils the fun.”
原贴在这里
http://www.madshrimps.be/?action=getarticle&number=1&artpage=3941&articID
p***A
发帖数: 607
30
来自主题: Hardware版 - Antec ISK300-65 mini-itx case $33
the review
http://www.silentpcreview.com/article959-page8.html
Antec ISK 300-65 Case Balance Sheet
Pros
- Sturdy and small
- Good airflow design
- Built in fanless power supply
- Already set up for 2.5" drives
- Affordable
- Better cooling than other m-ITX cases
Cons
- Could be more attractive
- Lousy fan
- Could be a bit smaller
- AC/DC power adapter is only 65W
- No HDD soft grommets
j*******o
发帖数: 75
31
来自主题: Hardware版 - 求推荐CPU风扇
Have you ever got chance to compare Plus vs. EVO? How about EVO? Just from
the specs, it looks to me that EVO has a broader fan speed and airflow, as
well as less noise.
Thanks!
c********n
发帖数: 1577
32
来自主题: Hardware版 - 有没有人装电脑装上瘾的?

to
你是在讲我把?
呵呵。装机可以开机,跟装机装的漂亮。。能是一样的么?
效果也许区别不大。 可东西是一样的吗?
装机一个老娘们都能装。我见过一个女的自己装了一台挺牛的机器。。。 里面的线,
乱的都吓人。。已经阻碍airflow了。。
N*******3
发帖数: 2589
33
来自主题: Hardware版 - 请高手看看这个配置单如何?
CPU
Intel Core i5-4690K Processor 3.5 GHz LGA 1150 BX80646I54690K
$224.29
主板
MSI ATX DDR3 2400 LGA 1150 Motherboards Z97 PC MATE
$99.99
显卡(缩水到3.5GB显存,但是还是觉得信价比不错,问题不大)
EVGA GeForce GTX 970 Super Clocked ACX 2.0 4GB GDDR5 Graphics Card
$329.99
电源
EVGA 600B 80PLUS Bronze Certified ATX12V/EPS12V Active PFC 600W Power Supply
100-B1-0600-KR
$59.99
内存
Crucial Ballistix Sport 16GB Kit (8GBx2) DDR3 1600 MT/s (PC3-12800) UDIMM
Memory BLS2KIT8G3D1609DS1S00/ BLS2CP8G3D1609DS1S00
$114.99
硬盘
Samsung 850 EVO ... 阅读全帖
I******n
发帖数: 5952
34
来自主题: Hardware版 - 请高手点评配置并推荐电源
哈哈,我开个玩笑。你这个配置绝对可以的。
不过我可能会换个机箱,400r当然也不错,不过我更喜欢这种主板和存储分开的cube,http://www.corsair.com/en-us/carbide-series-air-540-high-airflow-atx-cube-case,cable management 更方便,内部更简洁,风道更通畅。
我不知道你对静音有没有什么要求,400r的intake,exhaust都是120 mm,这个cube 可
以用140mm风扇。相对来说,120 mm的扇子很难兼顾performance和静音。
h100i的stock扇子很吵,即使调到500 rpm还是会有很讨厌的humming noise,想安安静
静干活的时候很难集中精神。
s*****i
发帖数: 147
35
来自主题: Hardware版 - 请高手点评配置并推荐电源
我想越安静越好,也想搞正压防尘。
之前一个防尘的帖子,http://www.mitbbs.com/article_t/Hardware/31861669.html,一位兄台推荐了大机箱装很多120mm风扇,并使用500 rpm的做法。很想参考,才选了这个机箱。你现在说h100i扇子调到500 rpm也很吵,那怎么解啊?换风冷?

http://www.corsair.com/en-us/carbide-series-air-540-high-airflow-atx-cube-case,cable management 更方便,内部更简洁,风道更通畅。
z*********e
发帖数: 10149
36
来自主题: Hardware版 - 升级了
我都是自己的monitor在check stock
如果你还要买,我可以把我的monitor的email转发给你
刚刚收到一个新蛋的openbox alert
Open Box: ZOTAC GeForce GTX 1080 Mini, ZT-P10800H-10P, 8GB GDDR5X IceStorm
Cooling, Dual Fans, 90mm Pressure Optimized Fan, 100mm Maximum Airflow
Optimized Fan, Direct GPU Copper Block Contact, Metal Back plate@$467.99?
最近几天价格一般就是了
j**********9
发帖数: 81
37
来自主题: Hardware版 - 装DL机器,预算$10K
单位给点小钱装个Deep Learning 的机器玩玩,主要用CNN处理图像。有个公司报价
8500,大体配置如下:
Intel Core i7-6950X (10C/20T) 25M Cache, 3.0GHz up to 4.0GHz
4 x 1080 Ti
8 x 16GB DDR4 2133 MHz Desktop Memory Modulel (128GB system memory)
1TB 2.5 SATA III Internal Solid State Drive (SSD)
4TB 7200RPM 64MB CACHE 3.5IN SATA Enterprise Class HDD
X99-E WS Intel X99 Server Workstation Motherboard
Black Steel / Plastic ATX Cube High Airflow Cube Case
Active LGA2011/-3 Cooler
1500w ATX12v/EPS12v Active PFC Power Supply
请板上大神们帮忙看看这个报价是否合理,有什么... 阅读全帖
N*****m
发帖数: 42603
38
来自主题: Programming版 - 问个docker做pipeline的基础问题
用airbnb的airflow吧,算是功能比较全的
m*********3
发帖数: 158
39
Easiest way: buy an air compressor for ~$200. It will provide you a constant
air flow.
Or diy way: find a fan, put a tube around the cover, seal the gap between
cover and tube. You should have constant air flow from the other end of the
tube. By changing the speed of the fan, you should be able to change the
airflow as well.
d**********a
发帖数: 25
40
来自主题: Environmental版 - vapor transport software
自己孤陋寡闻,想找vapor transport和airflow方面的专业软件,好像有很多water
transport and flow的大牌软件,能用来算vapor transport 吗?有针对air的吗?
l********y
发帖数: 2295
41
来自主题: MedicalCareer版 - Tips for IM interns (转载)
ID:
- PNA: determine type (CAP, HCAP, or HAP) and start appropriate abx regimen;
r/o COPD exac
- DM with chronic infections: r/o bone infection, check for osteo (imaging,
XR); start vanco; inherently immunosuppressed; think of fungal infxn's too
- Back pain + fever: r/o epidural abscess with MRI; call neurosurgery
- Low threshold to do LP in anyone with AMS, h/a, nuchal rigidity, concern
for meningitis; consider septic emboli and checking TTE; image head
- TB: if suspect, admit to neg airflow is... 阅读全帖
l***o
发帖数: 7937
42
来自主题: Physics版 - 飞机为什么会飞?
飞机为什么会飞?这个题目太大了,需要考虑的情况太多了。
从飞机类型考虑,Rotor aircraft和Wing aircraft不同; 同样是Wing aircraft,民用机又和军用机不同(军用机的速度高很多,姿势要求多,甚至需要360度翻转); 同样是军用机,陆地起飞的战机和母舰起飞的战机也不同(后者起飞距离短,甚至需要垂直起降); 同样是军用飞机,subsonic,transonic, supersonic, hypersonic, high-hypersonic又不一样;同样是一般商用民航机,不同的angle of attack情况也会不同(随着AoA的增大,气流会与airfoil的上表面分离,出现turbulence甚至whirlpool)。(当然啦,如果你是一个aerodynimics的专家,你会以说,这些本质都一样,因为都是N-S方程govern的。)
就拿一个flight cycle来看,起飞、巡航、控制和降落也不一样。这个题目至少包含四层意思:(1)飞机怎么能飞起来?(takeoff)(2)飞机在天上巡航,为什么不掉下来(cruise)?(3)飞机如何调整高度和转向(... 阅读全帖
b*p
发帖数: 242
43
来自主题: Physics版 - 飞机为什么会飞?
赞!菠萝飞行器设计制造系的?
我想问一下又没有人考虑过设计仿hummingbird的飞行器?

民用机又和军用机不同(军用机的速度高很多,姿势要求多,甚至需要360度翻转);
同样是军用机,陆地起飞的战机和母舰起飞的战机也不同(后者起飞距离短,甚至需要
垂直起降); 同样是军用飞机,subsonic,transonic, supersonic, hypersonic,
high-hypersonic又不一样;同样是一般商用民航机,不同的angle of attack情况也会
不同(随着AoA的增大,气流会与airfoil的上表面分离,出现turbulence甚至
whirlpool)。(当然啦,如果你是一个aerodynimics的专家,你: 会以说,这些本质
都一样,因为都是N-S方程govern的。)
四层意思:(1)飞机怎么能飞起来?(takeoff)(2)飞机在天上巡航,为什么不掉
下来(cruise)?(3)飞机如何调整高度和转向(flight control)?(4)飞机如何降落
(landing)?估计这些都不是楼主的意思。楼主要问的是:How is lift gener... 阅读全帖
d*********r
发帖数: 813
44
来自主题: Physics版 - 飞机为什么会飞?
讲得的确非常好。
cruise speed大约0.8Mach, 属于subsonic and transonic aerodynamics,超出low-speed
aerodynamics范围了。飞机起飞着陆阶段属于low-speed aerodynamics。

民用机又和军用机不同(军用机的速度高很多,姿势要求多,甚至需要360度翻转);
同样是军用机,陆地起飞的战机和母舰起飞的战机也不同(后者起飞距离短,甚至需要
垂直起降); 同样是军用飞机,subsonic,transonic, supersonic, hypersonic,
high-hypersonic又不一样;同样是一般商用民航机,不同的angle of attack情况也会
不同(随着AoA的增大,气流会与airfoil的上表面分离,出现turbulence甚至
whirlpool)。(当然啦,如果你是一个aerodynimics的专家,你: 会以说,这些本质
都一样,因为都是N-S方程govern的。)
四层意思:(1)飞机怎么能飞起来?(takeoff)(2)飞机在天上巡航,为什么不掉
下来(cruise)?(3)... 阅读全帖
D****R
发帖数: 6053
45
来自主题: Physics版 - 飞机为什么会飞?
解释的好!

民用机又和军用机不同(军用机的速度高很多,姿势要求多,甚至需要360度翻转);
同样是军用机,陆地起飞的战机和母舰起飞的战机也不同(后者起飞距离短,甚至需要
垂直起降); 同样是军用飞机,subsonic,transonic, supersonic, hypersonic,
high-hypersonic又不一样;同样是一般商用民航机,不同的angle of attack情况也会
不同(随着AoA的增大,气流会与airfoil的上表面分离,出现turbulence甚至
whirlpool)。(当然啦,如果你是一个aerodynimics的专家,你: 会以说,这些本质
都一样,因为都是N-S方程govern的。)
四层意思:(1)飞机怎么能飞起来?(takeoff)(2)飞机在天上巡航,为什么不掉
下来(cruise)?(3)飞机如何调整高度和转向(flight control)?(4)飞机如何降落
(landing)?估计这些都不是楼主的意思。楼主要问的是:How is lift generated?
对于这个问题的解释不是没有,而是很多,当然也有一些不完整(如airfl... 阅读全帖
i*****e
发帖数: 1359
46
来自主题: Physics版 - 飞机为什么会飞?
赞,原来我不懂kutta condition,现在了解了

民用机又和军用机不同(军用机的速度高很多,姿势要求多,甚至需要360度翻转);
同样是军用机,陆地起飞的战机和母舰起飞的战机也不同(后者起飞距离短,甚至需要
垂直起降); 同样是军用飞机,subsonic,transonic, supersonic, hypersonic,
high-hypersonic又不一样;同样是一般商用民航机,不同的angle of attack情况也会
不同(随着AoA的增大,气流会与airfoil的上表面分离,出现turbulence甚至
whirlpool)。(当然啦,如果你是一个aerodynimics的专家,你: 会以说,这些本质
都一样,因为都是N-S方程govern的。)
四层意思:(1)飞机怎么能飞起来?(takeoff)(2)飞机在天上巡航,为什么不掉
下来(cruise)?(3)飞机如何调整高度和转向(flight control)?(4)飞机如何降落
(landing)?估计这些都不是楼主的意思。楼主要问的是:How is lift generated?
对于这个问题的解释不是没... 阅读全帖
c****e
发帖数: 2127
47
来自主题: Physics版 - 飞机为什么会飞?
of
attack都不大。飞机的cruise speed大约0.8Mach, 属于low-speed aerodynamics。由于
airfoil trailing edge的设计是sharp-cornered的,加上气体有黏滞性,这保证了
airfoil在posotive AoA情况下运动时,气流平滑地离开trailing edge并且上下表面没
有压
~~~~~~~~~~~~
力差(即starting vorticity is shed into wake或者说starting vortex is cast
~~~~
off),即满足了Kutta条件,从而产生环流, 进而产生lift。
请问这个没有压力差是指哪个部位?trailing edge?
用机又和军用机不同(军用机的速度高很多,姿势要求多,甚至需要360度翻转); 同
样是军用
机,陆地起飞的战机和母舰起飞的战机也不同(后者起飞距离短,甚至需要垂直起降)
; 同样是军
用飞机,subsonic,trans... 阅读全帖
r***6
发帖数: 401
48
来自主题: Archery版 - Extreme-Height Tree Stand Tactics
http://www.gameandfishmag.com/2010/09/28/hunting_bowhunting-hun
By P.J. Reilly
One more tree to clear and he’s mine, I told myself as a magnificent 10-
pointer approached to within 20 yards of my tree stand. When the buck stuck
his head out from behind a maple sapling, I felt a tingle on the back of my
neck. The swirling wind had reversed direction, and it blew my scent right
to the deer.
Like a shot, the buck’s head was up and his coal-black eyes glared at me.
He tipped his head back so that hi... 阅读全帖
w******x
发帖数: 4396
49
来自主题: _Auto_Fans版 - 各位大爷,, 小弟有事请教,, 请进,

imporve on the car, is because the ECU setting (i.e. X% of air mix with Y%
gas) is still the same.
you got the wrong idea. power is not made by making the mixture richer thru
an ECU remap. the intention of installing better intake/filter is to improve
airflow. more air means the injectors will correspondingly inject more fuel
as dictated by the fuel injection map. more fuel burnt in the same amount
of time means more power. the reason said intake/filter won't work is
because they don't provide
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