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[专题] 新西兰发射服务商RocketLab和Electron火箭:RocketLab计划伞降回收Electron助推器

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hyperion 发表于 2017-1-8 07:09 | 显示全部楼层
楠宫晓风vn 发表于 2016-10-30 19:15
可以搞俩燃气发生器供电,燃气发生器启动可以上电池

但这样的话,直接用燃气发生器涡轮泵不是更好,还何必电传动嗯?
xtal 发表于 2017-1-8 16:20 | 显示全部楼层
本帖最后由 xtal 于 2017-1-8 16:22 编辑
hyperion 发表于 2017-1-8 07:09
但这样的话,直接用燃气发生器涡轮泵不是更好,还何必电传动嗯?

直接驱动有燃气泄漏问题。如果富燃燃气泄漏到液氧泵里面直接就是大烟花。
电传动就没这个问题了。
其他还有好处。
这里顺便提一句,低温火箭发动机的电泵,是不能用常规电机功率密度来计算的。因为高性能低温冷却剂“无穷无尽”。
hyperion 发表于 2017-1-8 22:50 | 显示全部楼层
xtal 发表于 2017-1-8 16:20
直接驱动有燃气泄漏问题。如果富燃燃气泄漏到液氧泵里面直接就是大烟花。
电传动就没这个问题了。
其他 ...

话说燃气泄漏造成大烟花对于性能要求不高的涡轮泵应该不是大问题吧?当年V2导弹上泵压酒精的过氧化氢涡轮泵都没这问题呢。
xtal 发表于 2017-1-9 01:29 | 显示全部楼层
hyperion 发表于 2017-1-8 22:50
话说燃气泄漏造成大烟花对于性能要求不高的涡轮泵应该不是大问题吧?当年V2导弹上泵压酒精的过氧化氢涡轮 ...

再怎么要求不高也不能炸了啊。
hyperion 发表于 2017-1-9 20:51 | 显示全部楼层
xtal 发表于 2017-1-9 01:29
再怎么要求不高也不能炸了啊。

V2的不就没炸吗?因此看来,只要对性能要求不高,就算技术和生产能力不是特别高,应该也能保证不炸。
此外好像就氢氧火箭发动机强调涡轮泵有这个大缺点,然后鼓吹全流量分级燃烧的优越性了吧?
xtal 发表于 2017-1-9 22:54 | 显示全部楼层
hyperion 发表于 2017-1-9 20:51
V2的不就没炸吗?因此看来,只要对性能要求不高,就算技术和生产能力不是特别高,应该也能保证不炸。
此 ...

过氧化氢的功率密度还不如锂电池,你觉得用这个比较合适么?
hyperion 发表于 2017-1-10 18:46 | 显示全部楼层
xtal 发表于 2017-1-9 22:54
过氧化氢的功率密度还不如锂电池,你觉得用这个比较合适么?

这个例子只是说明如果降低性能要求保证密封应该是不难的,不能理解成只有采用过氧化氢涡轮泵才比较容易密封吧?
另外说“过氧化氢的功率密度不如锂电池”这句话是错误的表述,过氧化氢只有能量密度,不存在功率密度,能用功率密度表证的应该是过氧化氢的气体发生器及涡轮泵系统。V2的气体发生器系统的泵功率为580HP,重量没找到,但即使假设为200kg,其功率密度也有2.13kw/kg了。就算是功率型锂离子电池,其功率密度也不过1kw/kg吧?哪里更大了?而且这种功率型锂离子电池的能量密度通常仅有区区70wh/kg而已。如果比较能量密度的话,85%过氧化氢的分解热可达2.5MJ/kg,假设涡轮效率仅为24%,也有167wh/kg了,这可比功率型锂离子电池大多了。如果你用能量型锂离子电池或者一次性金属锂电池进行比较的话,确实会觉得锂电池的能量密度更大,但是请注意“能量型锂离子电池和一次性金属锂电池”是不可能以那么大的倍率进行放电的。
xtal 发表于 2017-1-10 20:30 | 显示全部楼层
hyperion 发表于 2017-1-10 18:46
这个例子只是说明如果降低性能要求保证密封应该是不难的,不能理解成只有采用过氧化氢涡轮泵才比较容易密 ...

笔误,确实是能量密度
Flying_Pencil 发表于 2017-1-11 13:35 来自航空航天港手机版! | 显示全部楼层
Jeff Foust:
Rocket Lab tells me “no test this month but we’re certainly getting close.”
Flying_Pencil 发表于 2017-1-11 13:38 来自航空航天港手机版! | 显示全部楼层
cmj9808 发表于 2017-1-6 13:53
这个算“其他发射”,发射场更新要等到站长下次更新网站了@站长

我们这里的火箭归属是按发射场划分的吗? 按运营商和制造商的话貌似应该分给美国
 楼主| cmj9808 发表于 2017-1-13 15:42 | 显示全部楼层
Flying_Pencil 发表于 2017-1-11 13:38
我们这里的火箭归属是按发射场划分的吗? 按运营商和制造商的话貌似应该分给美国

参照Soyuz的例子,拜科努尔发射的算俄罗斯发射,库鲁发射的算欧洲发射。
Flying_Pencil 发表于 2017-1-14 15:14 | 显示全部楼层
WSJ的一篇文章,RocketLab曾经跑遍了美国的每一个靶场,没有一个能满足他一周一射的发射频率,无奈只能去的新西兰 BN-RN208_0106ro_HD_20170106140822.jpg
BN-RN206_0106ro_P_20170106140822.jpg
By ROB TAYLOR
Jan. 9, 2017 12:22 p.m. ET
17 COMMENTS
MAHIA PENINSULA, New Zealand—The next generation of satellite executives dream of firing a rocket a week into the skies. But they’re running up against an unusual problem for star trekkers. A lack of space.

“We went to all the launch ranges in America,” said Peter Beck, a wiry-haired engineer who a decade ago founded Calif.-based aerospace company Rocket Lab. “They just didn’t allow the frequency that we needed in order to make space accessible for everybody.”

Finding an empty corner of the world isn’t easy for an industry expected to launch as many as 3,000 microsatellites over the next several years.


Take out flight paths of commercial airlines, shipping routes, towns and cities and the map shrinks pretty quickly. In the U.S., orbital launch sites are government owned, which represents another drawback in terms of cost and access. There’s Siberia, of course, but the idea of taking commercially sensitive technology to Russia makes some executives uneasy, before factoring in difficulties in getting there.

“A small island nation in the middle of nowhere,” said Mr. Beck, “is pretty much exactly what you want.”

Welcome to New Zealand: earthquake-prone, dotted with volcanoes and containing six times as many sheep as people. The country doesn’t even have a combat air force, having scrapped its warplanes about 15 years ago to save money.

Yet the South Pacific country has become the unlikely frontier in a drive to open a private rocket-launch site, servicing a soaring market for tiny satellites, many the size of a shoe box.

Mr. Beck, a native New Zealander whose company controls what it calls the world’s first private orbital-launch complex, sees the remote location as a help rather than hindrance—there is almost nothing but ocean between New Zealand and South America. That gives the company easy access to airspace, compared with the busy air and sea movements around the U.S., as well a bigger range of lucrative orbit paths.

Budding satellite entrepreneurs swiftly encountered a problem: New Zealand hadn’t expected to join the space race. Putting rockets into the skies required a regulatory framework, which the country lacked. It also needed a safeguard agreement with the U.S. to maintain secrecy around prized rocket technology. In a country averse to showiness, New Zealand’s Parliament seemed surprised by the novelty.

On a recent day, lawmaker David Clark rose to speak at the first reading of the Outer Space and High Altitude Activities Bill to croon a recital of Elton John’s “Rocket Man” to general bemusement. “She packed my bags last night, pre-flight. Zero hour 9 a.m.,” said Mr. Clark. “Rocket man burning out his fuse up here alone.”

David Bowie, Darth Vader, “The Muppet Show” and “Pigs in Space” also came up in discussions of the bill, which the government hopes will become law by mid-2017. The legislation includes setting up a regulatory agency and signing international safeguards conventions. Mr. Beck already has permission to conduct test flights of the company’s rockets.

On the Mahia Peninsula—a spit of mountainous farmland where Rocket Lab has built its launch pad—the space industry’s arrival hasn’t come without commotion. A “secret” here used to mean protecting prized surf breaks and lobster-fishing sites from summer tourists.

Farmers Pat and Sue O’Brien, who graze sheep and cattle beside the new launch-pad access road, say Rocket Lab’s arrival spawned conspiracy theories. “People are slowly getting the mindset Rocket Lab are a great big space freight company, rather than one carrying bombs and nuclear weapons,” said Mr. O’Brien. “There have been some crazy questions at community meetings.”

Mark Browne, a contractor hired to repair dirt roads over Mahia’s precipitous passes to turn them from farm tracks to roads safe for trucks carrying rocket fuel, said secrecy provisions enforced by Rocket Lab meant he couldn’t even tell staff what they were working on, while also triggering other unexpected concerns.

“People like to treat the road now like a rally circuit,” Mr. Browne said. “They come around a corner expecting no one to be there. A truck with a rocket is a bit of a surprise.”

For Mahia’s volunteer fire brigade, made up mostly of farmers, the prospect of a rocket accident raised eyebrows. Nigel Hall, who heads the New Zealand Fire Service here, has been carrying out practice drills and plans to have extra people on hand when Rocket Lab starts test launches early in 2017.

“The mixing of fuel products used to launch the rocket was something new to most us,” Mr. Hall said. “But we eventually reckoned if there was some kind of failure, after the bang we’d just be left with what we’re usually left with round here: a grass fire. There’s nothing else to burn.”

Rocket Lab, backed by aerospace giant Lockheed Martin Corp., hopes to be the first company to begin commercially launching miniaturized satellites on a weekly basis from its own launch site. The company plans to use a newly constructed pad here and a two-stage ‘Electron’ rocket, built of carbon composite and 3D-printed, battery-powered engines.

Residents of the Mahia Peninsula, who call themselves “Mahiatians,” can sense an opportunity for jobs and rocket tourism in their new but still alien industry, with plans to build holiday units and offer bus rides to starry-eyed space tourists.

“The last thing that happened here that stirred up so much excitement, with people for and against, was the plan for a new sewerage system,” said Janey Bowen, owner of the Cafe Mahia restaurant, who plans to rebrand it as Mahia’s Rocket Café. On the revamped menu: a thruster hamburger, rocket cookies and a galaxy smoothie.

On a remote peninsula that only a few years ago had no web access, internet company owner Ronald Brice said he has had to install broadband links with speeds allowing Rocket Lab to monitor launches from Auckland, 370 miles away.

“Most people in Mahia now have world-leading broadband,” said Mr. Brice.

Others are a touch underwhelmed, being more attuned over the years to other legendary exploits along the coast here. Mahia is where the folkloric Maori hero Maui is said to have punched himself in the nose to draw blood and lure a fish that turned out to be New Zealand’s North Island.

“I have been to Cape Canaveral to see a rocket go up once,” said Pauline Tangiora, a Maori elder from Mahia’s Rongomaiwahine Tribe. “It didn’t impress me at all.”http://www.wsj.com/articles/welc ... er-space-1483982532


xtal 发表于 2017-1-14 22:06 | 显示全部楼层
hyperion 发表于 2017-1-10 18:46
这个例子只是说明如果降低性能要求保证密封应该是不难的,不能理解成只有采用过氧化氢涡轮泵才比较容易密 ...

过氧化氢涡轮效率很低的。
 楼主| cmj9808 发表于 2017-1-14 23:01 | 显示全部楼层
Flying_Pencil 发表于 2017-1-14 15:14
WSJ的一篇文章,RocketLab曾经跑遍了美国的每一个靶场,没有一个能满足他一周一射的发射频率,无奈只能去的 ...

一周一射,那制造厂得建在新西兰了
hyperion 发表于 2017-2-15 12:45 | 显示全部楼层
xtal 发表于 2017-1-14 22:06
过氧化氢涡轮效率很低的。

过氧化氢分解气的温度高达700摄氏度,比超超临界蒸汽轮机的参数都高了,这里才假设效率24%,并不算高吧?
Flying_Pencil 发表于 2017-2-16 13:48 | 显示全部楼层
火箭抵达发射场LC1,正在测试
Electron-at-Launch-Complex-1-Full-shot.jpg
Electron-at-Launch-Complex-2.jpg
http://www.rocketlabusa.com/latest/electronarriveslaunchcomplex1/

PS 离发射越来越近了,@cmj9808 应该开发射帖了

点评

你开一个吧,就用这张图作为顶楼  发表于 2017-2-16 13:53
Flying_Pencil 发表于 2017-2-16 13:51 | 显示全部楼层
Flying_Pencil 发表于 2017-2-16 13:48
火箭抵达发射场LC1,正在测试

计划进行3次试验发射
The launch, which will be the first orbital launch attempt from New Zealand, is the first of three planned tests before Rocket Lab begins providing customers commercial satellite launches.
 楼主| cmj9808 发表于 2017-2-16 13:53 | 显示全部楼层
话说electron的固体三级是谁提供的?一直没看到相关报道
Flying_Pencil 发表于 2017-2-16 14:05 | 显示全部楼层
cmj9808 发表于 2017-2-16 13:53
话说electron的固体三级是谁提供的?一直没看到相关报道

感觉是rocketLab在刻意回避这个问题,除了2014版的手册,其他地方宣传写的都是二级运载火箭,难道是改设计了?
 楼主| cmj9808 发表于 2017-2-16 14:28 | 显示全部楼层
Flying_Pencil 发表于 2017-2-16 14:05
感觉是rocketLab在刻意回避这个问题,除了2014版的手册,其他地方宣传写的都是二级运载火箭,难道是改设 ...

亦或固体三级属于可选项,并非标配?
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