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[任务跟踪] ULA的新一代模块化火箭Vulcan—完成PDR

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ssizz 发表于 2017-3-6 23:23 | 显示全部楼层
Flying_Pencil 发表于 2017-3-6 22:12
这是挑战俄罗斯的终极必杀。。。

除了推力,其它参数乃至综合增益好像没超过RD180,更说不上挑战RD170。
或者采购价下来了?
mum 发表于 2017-3-6 23:35 | 显示全部楼层
bezos套现亚马逊的成果。。。
 楼主| cmj9808 发表于 2017-3-7 00:03 | 显示全部楼层
ssizz 发表于 2017-3-6 23:23
除了推力,其它参数乃至综合增益好像没超过RD180,更说不上挑战RD170。
或者采购价下来了?

是的,主打成本牌
...Tobey said the BE-4 engine is only 60 percent of the cost of the AR1, a clear advantage in today’s cost-driven market.
- See more at: http://spacenews.com/ula-intends ... thash.seH7b9L2.dpuf
跆拳道大灰狼 发表于 2017-3-7 00:17 | 显示全部楼层
cmj9808 发表于 2017-3-7 00:03
是的,主打成本牌

没落的洛克达因啊,AR-1卖给谁去啊。。。SpaceX、蓝源、欧洲人乃至中国人,都在搞可复用甲烷机,结果洛克达因却搬出来一个如此不合时宜的煤油AR-1,进度、价格、性能都没什么优势。

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 楼主| cmj9808 发表于 2017-3-7 00:22 | 显示全部楼层
本帖最后由 cmj9808 于 2017-3-7 00:24 编辑
跆拳道大灰狼 发表于 2017-3-7 00:17
没落的洛克达因啊,AR-1卖给谁去啊。。。SpaceX、蓝源、欧洲人乃至中国人,都在搞可复用甲烷机,结果洛克 ...

双AR-1的比冲弱于RD-180,推力和价格与后者相当,它唯一的优势是非俄国造,唯一的机会就是BE-4试车不顺利。
PS:洛克达因就是航天发动机界的诺基亚,一步错,步步错
Flying_Pencil 发表于 2017-3-20 21:32 | 显示全部楼层
发件人:Jeff Bezos<jeff@blueorigin.com

Although the BE-4 turbopump is smaller than your refrigerator, it generates 70,000 horsepower from a turbine running at nearly 19,000 revolutions per minute that pumps cryogenic propellants to pressures just under 5,000 pounds per square inch. To react the forces generated by the rotating turbine and impellers inside the pump, production rocket turbopumps to date have used traditional ball and roller bearings. For BE-4, we’re doing something different – we’re using hydrostatic bearings.

A hydrostatic bearing relies on a fluid film supplied by a high-pressure source to provide support for the shaft and cause it to float without contacting the static structure except at startup and shutdown. The BE-4 main turbopump uses hydrostatic journal bearings for radial support and hydrostatic axial bearings to carry axial thrust. The system is bootstrapped. The high pressure fluid films for the bearings are supplied by the propellants themselves – liquefied natural gas and liquid oxygen – tapped off from the pump discharge flows.

Material selection is a critical consideration for this approach, as there is physical contact between the bearing surfaces during the start transient before the fluid film is fully established and during the shutdown transient as the fluid film dissipates. With lab-scale tests and full-scale bearing rig tests using actual pump hardware, we evaluated over 20 material combinations in over a hundred tests, leading to our baseline material and coating choices.

Extensive rotordynamic and computational fluid dynamics analyses have shown the feasibility of this design, and recent powerpack tests confirmed that this approach works during the startup and shutdown transients – the most critical phases. The shaft orbit plot below shows that the turbopump lifts off smoothly and centers during a typical start transient, demonstrating a smooth ride on a film of propellant.

Why do we go to all this trouble instead of just using traditional bearings? Engine life. We’re relentlessly focused on reusability, and properly designed hydrostatic bearings offer the potential for longer engine life without refurbishment. This is one of the many engineering decisions we’ve made that we hope will lead to reusability – not just in principle – but to practical, operational reusability. If “reusability” requires significant refurbishment, inspection, and re-validation between flights, then it simply won’t lead to the far lower launch costs we need to achieve our vision of millions of people living and working in space.

We’ll keep you up to date as our testing progresses in the coming weeks.

Gradatim Ferociter!

Jeff Bezos


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黑与白 发表于 2017-3-21 08:16 | 显示全部楼层

现在有一点可以确定了,BE-4用的是LNG,而猛禽用的是纯甲烷 ,不过文中暗讽spacex复飞大规模翻新很有意思
 楼主| cmj9808 发表于 2017-3-21 12:14 | 显示全部楼层
黑与白 发表于 2017-3-21 08:16
现在有一点可以确定了,BE-4用的是LNG,而猛禽用的是纯甲烷 ,不过文中暗讽spacex复飞大规模翻新很有意思

BE-4用的应该也是纯甲烷,提纯LNG花费很少,而BE-4如果用静压轴承( hydrostatic bearing),需要用液态甲烷作为液膜。
 楼主| cmj9808 发表于 2017-4-7 12:33 | 显示全部楼层
ULA目前最大的顾虑是BE-4的燃烧稳定性,一旦整机全推力试车证明不存在燃烧稳定性问题,ULA将选择BE-4。在卡角的火箭制造厂房建成前,引擎将在肯特郡的Blue Origin工厂制造。

http://spacenews.com/bruno-vulca ... t-is-blues-to-lose/
陈鹏旭 发表于 2017-4-7 12:52 | 显示全部楼层
cmj9808 发表于 2017-4-7 12:33
ULA目前最大的顾虑是BE-4的燃烧稳定性,一旦整机全推力试车证明不存在燃烧稳定性问题,ULA将选择BE-4。在卡 ...

AR-1怎么办
 楼主| cmj9808 发表于 2017-4-7 14:12 | 显示全部楼层

AJR自己想办法找客户
 楼主| cmj9808 发表于 2017-4-15 23:37 | 显示全部楼层
Vulcan相关消息两则
RAUG在ULA工厂内的整流罩和级间段生产线完工,Atlas和Vulcan的整流罩和级间段将从瑞士转移至ULA工厂生产
http://www.spaceflightinsider.com/organizations/ula/ruag-joins-ula-in-decatur-as-development-of-vulcan-continues/

PaR Systems为ULA制造的焊机到位,将用于Vulcan箭体制造

Super advanced, automated welding gear showing up in our factory to support Vulcan.  Thanks @PaRSystemsInc

https://twitter.com/torybruno/status/852900634210713601


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黑与白 发表于 2017-4-16 20:29 | 显示全部楼层
cmj9808 发表于 2017-4-15 23:37
Vulcan相关消息两则
RAUG在ULA工厂内的整流罩和级间段生产线完工,Atlas和Vulcan的整流罩和级间段将从瑞士 ...

看起来没有呢SLS那个VAC厉害
1717jy 发表于 2017-5-15 17:35 | 显示全部楼层
AR-1燃料改成液氧/甲烷应该不是很难吧,毕竟最难的富氧补燃循环技术都搞定了。
黑与白 发表于 2017-7-19 19:07 | 显示全部楼层
多种消息表明vulcan 重回5.1米直径
纵欲 发表于 2017-7-19 19:47 | 显示全部楼层
黑与白 发表于 2017-7-19 19:07
多种消息表明vulcan 重回5.1米直径

预示要换发动机吗?
黑与白 发表于 2017-7-19 19:53 | 显示全部楼层
纵欲 发表于 2017-7-19 19:47
预示要换发动机吗?

不会,主打依然是BE-4,就等第一次试车评估结束公布了
 楼主| cmj9808 发表于 2017-7-19 20:24 | 显示全部楼层
黑与白 发表于 2017-7-19 19:07
多种消息表明vulcan 重回5.1米直径

有链接吗?NSF和reddit都没有看到相关新闻
纵欲 发表于 2017-7-20 20:37 | 显示全部楼层
https://twitter.com/AerojetRdyne/status/887791820868136960
AR1燃烧试验?
黑与白 发表于 2017-7-23 21:31 | 显示全部楼层
现在基本可以确定ACES XCOR出局了
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