Author Topic: H3 development update thread  (Read 57650 times)

Offline Fuji

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« Last Edit: 04/11/2017 08:58 PM by Fuji »

Online FutureSpaceTourist

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Re: H3 development update thread
« Reply #81 on: 06/26/2017 03:44 PM »
Quote
MHI says H3 rocket development on track for 2020
by Caleb Henry — June 26, 2017

http://spacenews.com/mhi-says-h3-rocket-development-on-track-for-2020/

Article includes:

Quote
Ko Ogasawara, MHI’s vice president and general manager for launch, told SpaceNews the critical design review, or CDR, for the H3 is scheduled for this autumn and will give an indication of how effective the company has been at reducing costs.

Offline cheesybagel

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Re: H3 development update thread
« Reply #82 on: 07/03/2017 07:29 AM »
LE-9 test engine #1 photos.
http://jda.jaxa.jp/result.php?lang=j&id=06dff376756d0df623d702256a0be7a2

So does this use tube-wall or channel-wall regen nozzle cooling?
The pumps, etc, look a lot more elegant and simpler than most first stage engines. An advantage of the expander cycle I guess. I wonder how many restarts this engine can do in theory? Or how deep it can throttle.
« Last Edit: 07/03/2017 08:05 AM by cheesybagel »

Online zhangmdev

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Re: H3 development update thread
« Reply #83 on: 07/05/2017 11:31 AM »
Close view shows channel-wall nozzle (with reinforced ribs?)

Offline Prettz

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Re: H3 development update thread
« Reply #84 on: 07/12/2017 09:41 PM »
Close view shows channel-wall nozzle (with reinforced ribs?)
Just out of curiosity, what are some visual things that give away that a nozzle/bell is channel-wall? (Sorry if this would drift off-topic)
« Last Edit: 07/12/2017 09:41 PM by Prettz »

Offline Lars-J

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Re: H3 development update thread
« Reply #85 on: 07/12/2017 11:28 PM »
Close view shows channel-wall nozzle (with reinforced ribs?)
Just out of curiosity, what are some visual things that give away that a nozzle/bell is channel-wall? (Sorry if this would drift off-topic)

Some engines (like the F-1, SSME, and M1C) have cooling pipes that are painstakingly welded/attached to the inside and/or outside of the nozzle well. (see http://heroicrelics.org/info/f-1/f-1-thrust-chamber.html )

Channel wall nozzles have these pipes engraved/printed right into the nozzle wall itself, which is easier to automate and creates a flatter, simpler, and more efficient structure. Virtually all newer regeneratively cooled engines use this method.

So since the outside of the nozzle appears to have a flat surface, the assumption is that it uses channel wall cooling.

Please correct me if I am wrong. :)
« Last Edit: 07/12/2017 11:34 PM by Lars-J »

Offline Prettz

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Re: H3 development update thread
« Reply #86 on: 07/13/2017 01:24 AM »
So since the outside of the nozzle appears to have a flat surface, the assumption is that it uses channel wall cooling.
Well that really wasn't the response I was expecting. I obviously meant visual cues besides "it's not a tube-wall".

Online zhangmdev

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Re: H3 development update thread
« Reply #87 on: 07/13/2017 12:02 PM »
I was lazy. Assuming there are no tubes, so it must be channel walled.

Found "Visualization and Optimization of LE-X Engine System Margin", the nozzle extension (or nozzle skirt) is cooled by turbine outlet gas. Seems the gas is just dumped into the nozzle extension. There is no regenerative cooling channel.

Another feature is elongated combustion chamber. For some reason, the combustion chamber is called upper chamber. The nozzle is called lower chamber.

Offline MATTBLAK

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Re: H3 development update thread
« Reply #88 on: 07/13/2017 12:16 PM »
That LE9 is just a beautiful engine - stunning piece of hardware!!
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Re: H3 development update thread
« Reply #89 on: 07/15/2017 12:27 PM »
According to "Combustion Stability Improvement of LE-9 Engine for Booster Stage of H3 Launch Vehicle" from Mitsubishi Heavy Industries Technical Review Vol. 53 No. 4 (December 2016)

...hydrogen with its pressure decreased when driving the turbo pump enters into the nozzle, and flows along the adjacent of the wall surface while cooling it (film cooling).

There is a diagram noting "Flowing along nozzle internal wall (film cooling)".

Offline russianhalo117

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Re: H3 development update thread
« Reply #90 on: 07/15/2017 11:23 PM »
There is a discussion thread so use it people: H3 Development Discussion Thread (http://forum.nasaspaceflight.com/index.php?topic=37263.0).
« Last Edit: 07/18/2017 04:24 PM by russianhalo117 »

Offline russianhalo117

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Re: H3 development update thread
« Reply #91 on: 08/11/2017 04:09 PM »
Translate yourself:
使いやすいロケットを目指して~LE-9ターボポンプ単体試験~
JAXA | 宇宙航空研究開発機構
JAXA角田宇宙センターでは、LE-9エンジンに使われるターボポンプの単体試験が行われています。
ターボポンプはエンジンに燃料(液体水素)と酸化剤(液体酸素)を供給する重要な構成品です。
この試験ではターボポンプに実際に燃料と酸化剤を流して設計通りの機能・性能を発揮できたか確認しています。
ターボポンプはLE-9エンジンに取り付けられてエンジン燃焼試験が開始されました。

▽ ロケットナビゲーター(第一宇宙技術部門)
http://www.rocket.jaxa.jp/



次世代大型ロケット「H3」新型エンジン「LE-9」燃焼試験(実機型#1-1)
JAXA | 宇宙航空研究開発機構
JAXAが開発を進める次世代大型ロケット、「H3」の第1段エンジン「LE-9」の燃焼試験が種子島宇宙センターで始まっています。「LE-9」にはJAXAが10年以上にわたり研究に取り組んできたエキスパンダブリードサイクルを採用。これまでのエンジンを上回るパワーと安全性の両立を目指しています。

▽ ロケットナビゲータ  | LE-9
http://www.rocket.jaxa.jp/engine/le9/



EDIT: videos were replaced with amended versions so links have been replaced.
« Last Edit: 08/24/2017 05:49 AM by russianhalo117 »

Online Steven Pietrobon

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Re: H3 development update thread
« Reply #92 on: 08/17/2017 07:49 AM »
Here is the translation.

"Aiming at easy-to-use rocket-LE-9 Turbo pump Unit Test
JAXA | Aerospace Research and Development Organization
The JAXA Tsunoda Space Center has a unit test for the turbo pump used in the LE-9 engine.
The turbo pump is an important component of supplying fuel (liquid hydrogen) and oxidizing agent (liquid oxygen) to the engine.
In this test, we have confirmed whether the turbo pump was able to demonstrate the function and performance as designed by actually shedding fuel and oxidizing agent.
The turbo pump was installed in the LE-9 engine and the engine combustion test was started.

Rocket Navigator (Cosmic Air Technology Division)
http://www.rocket.jaxa.jp/"

"Next-generation large rocket "H3" new Engine "LE-9" combustion test (actual type # 1-1)
JAXA | Aerospace Research and Development Organization
The combustion test of the first-stage engine "LE-9" of the next-generation large-scale rocket, "H3", which JAXA develops begins at Tanegashima Space Center. "LE-9" employs an expander bleed cycle that JAXA has been working on for more than ten years. We aim to balance the power and safety exceeding the previous engine.

Rocket Navigator | le-9"
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Offline yoichi

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Re: H3 development update thread
« Reply #93 on: 09/08/2017 08:33 AM »
JAXA New LE-9 Rocket Engine
« Last Edit: 09/11/2017 09:16 AM by yoichi »

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