Author Topic: H3 development update thread  (Read 53602 times)

Offline Fuji

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

Offline 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 »

Offline 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?)

Online 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 »

Online 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 »

Online 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".

Offline 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.

Online 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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Offline zhangmdev

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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 »

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