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#420
by
abhishek
on 17 Dec, 2014 17:56
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#421
by
abhishek
on 17 Dec, 2014 18:07
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I'm looking forward to the launch!
I have two questions about the LV, though, after seeing the latest schematic from the PDF:
1. Why do they leave the intertank area open on the upper stage of this LV? Or is this just for the inert test upper stage that isn't loaded with (semi) cryogenics? Has there ever been a launch vehicle that has had an enclosed interstage but exposed intertank section?
The structure is called Inter Tank Structure (cryo) or ITSc for this particular vehicle (GSLV Mk III). The reason continuous structure is not used here is because it connects two cryo tanks - LH2 (top) and LOX (bottom) which shrinks considerably when they are filled with liquids in cryo temperature. Truss type structure used here can be designed to have such degree of freedom that it can accommodate tank deformations without getting stressed. Similar truss-type structure is also used right above LH2 tank and right below LOX tank (they are covered with a protective shroud).
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#422
by
Prober
on 17 Dec, 2014 19:19
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Wishing the India program all the best, your having a very good 2014
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#423
by
edkyle99
on 17 Dec, 2014 19:36
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Now here's something smart. Look at the servicing/integration structure and see how they keep the opening narrow by having the rocket exist sideways, as opposed to the wide door approach with TITAN and DELTA IV HEAVY. There's some practical thinking.
Titan 3/4 was oriented "sideways" with respect to its Mobile Service Tower and other ground infrastructure in the same manner.
- Ed Kyle
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#424
by
sanman
on 17 Dec, 2014 21:53
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I'm looking forward to the launch!
I have two questions about the LV, though, after seeing the latest schematic from the PDF:
1. Why do they leave the intertank area open on the upper stage of this LV? Or is this just for the inert test upper stage that isn't loaded with (semi) cryogenics? Has there ever been a launch vehicle that has had an enclosed interstage but exposed intertank section?
The structure is called Inter Tank Structure (cryo) or ITSc for this particular vehicle (GSLV Mk III). The reason continuous structure is not used here is because it connects two cryo tanks - LH2 (top) and LOX (bottom) which shrinks considerably when they are filled with liquids in cryo temperature. Truss type structure used here can be designed to have such degree of freedom that it can accommodate tank deformations without getting stressed. Similar truss-type structure is also used right above LH2 tank and right below LOX tank (they are covered with a protective shroud).
So having that truss structure and the tanks exposed underneath doesn't introduce any turbulent flow problems? I'm assuming that there's less turbulence when you have a smooth shroud.
And while the Cryo engine is a dummy on this particular flight, would it normally be expected to be exposed without a shroud like that on future flights?
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#425
by
Chris Bergin
on 18 Dec, 2014 00:08
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#426
by
robertross
on 18 Dec, 2014 01:33
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#427
by
abhishek
on 18 Dec, 2014 02:04
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So having that truss structure and the tanks exposed underneath doesn't introduce any turbulent flow problems? I'm assuming that there's less turbulence when you have a smooth shroud.
And while the Cryo engine is a dummy on this particular flight, would it normally be expected to be exposed without a shroud like that on future flights?
Yes there will be turbulence issues but they must have worked out something.As for the second part,yes this is the final configuration,while the inter-stage has truss structure as well as protective shroud,the Inter tank remains open.
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#428
by
abhishek
on 18 Dec, 2014 02:07
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#429
by
Prober
on 18 Dec, 2014 02:08
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#430
by
sanman
on 18 Dec, 2014 02:11
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So having that truss structure and the tanks exposed underneath doesn't introduce any turbulent flow problems? I'm assuming that there's less turbulence when you have a smooth shroud.
And while the Cryo engine is a dummy on this particular flight, would it normally be expected to be exposed without a shroud like that on future flights?
Yes there will be turbulence issues but they must have worked out something.As for the second part,yes this is the final configuration,while the inter-stage has truss structure as well as protective shroud,the Inter tank remains open.
I'd be worried that the slipstream will come in there and rip some cables or hoses off the cryo engine during Qmax.
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#431
by
Prober
on 18 Dec, 2014 02:24
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#432
by
Steven Pietrobon
on 18 Dec, 2014 02:27
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Four minutes until start of broadcast.
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#433
by
Steven Pietrobon
on 18 Dec, 2014 02:30
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#434
by
ss1_3
on 18 Dec, 2014 02:31
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Webcast has begun!
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#435
by
vyoma
on 18 Dec, 2014 02:31
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#436
by
Prober
on 18 Dec, 2014 02:32
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#437
by
Steven Pietrobon
on 18 Dec, 2014 02:32
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#438
by
Steven Pietrobon
on 18 Dec, 2014 02:33
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#439
by
Steven Pietrobon
on 18 Dec, 2014 02:34
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