Ram Accelerator


by Clausius2
Tags: accelerator
Clausius2
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Nov5-04, 08:47 AM
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I've just got my final year project assigned. It has to do with a numerical simulation of a Ram Accelerator device.

Well, apart of having doubts, which I will post just here proximately, I would want to know some website to learn more about that type of device.

Apart of Google sites, which is my task to find them, do you know some web site dedicated to that or some academic site for further explanation?.

Thanks in advance.

EDIT: Notwithstanding how much I've been googling, I haven't found the difference between Scramjet and Ramjet engine. Anybody knows it?
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russ_watters
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Nov5-04, 11:25 AM
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Quote Quote by Clausius2
EDIT: Notwithstanding how much I've been googling, I haven't found the difference between Scramjet and Ramjet engine. Anybody knows it?
Not much - the difference is that the scramjet is shaped to optomize flow for supersonic combustion (that's what the "sc" stands for).
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Nov6-04, 05:41 AM
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Quote Quote by russ_watters
Not much - the difference is that the scramjet is shaped to optomize flow for supersonic combustion (that's what the "sc" stands for).
Thanks.

Doesn't have also the Ramjet a supersonic combustion in his combustion chamber?. Furthermore what's the design's difference between a Ramjet engine and a Ram Accelerator?. I'll keep on surveying over there...

Clausius2
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Nov7-04, 06:14 AM
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Thanks for your effort, Geniere, very helpful.
enigma
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Nov7-04, 07:32 AM
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Quote Quote by Clausius2
Doesn't have also the Ramjet a supersonic combustion in his combustion chamber?.
I don't think so. Normal shockwave out front of the combustion chamber slows the flow to subsonic speeds.
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Nov7-04, 07:56 AM
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Quote Quote by enigma
I don't think so. Normal shockwave out front of the combustion chamber slows the flow to subsonic speeds.
I have received your e-mail. And I have answered you to your gmail direction. Thank you very much.

Well, after being reading the RAM articles at University of Washington web, the ramjet engine can operate under supersonic combustion. In fact, there are three modes of operating of the ramjet engine:

-Subdetonative: the combustion is produced subsonically as you have just said.

-Transdetonative: there is transonic flow in the combustion chamber.

-Superdetonative: the combustion is made supersonically. Furthermore, this last mode is the so-called ScRamjet. Also, the RAM accelerator can operate in those three modes, the superdetonative is called ScRam accelerator.

This thread is not closed at all. You could comment all what you want about this subject. Proximately I will post some new doubts.
julesverne
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Nov11-04, 02:58 PM
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What a coincidence;)! My final project is also about a ramac! At the moment I was searching for something related to the chemical kinetic process.. and I came across your post! What exactly do you want to simulate (inputs-outputs)?
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Nov11-04, 03:31 PM
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Quote Quote by julesverne
What exactly do you want to simulate (inputs-outputs)?
What do you mean with that?

PD: I don't believe in coincidences, :P
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Nov11-04, 06:28 PM
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Sorry if I didn't explain myself very well..Basically, what I have to do is to calculate the generated acceleration as a function of Mach number given the initial state of the in-tube propellant and projectile geometry... using a relative simple one-dimensional unsteady flowfield model. Is that what you have to do as well?
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Nov12-04, 07:12 AM
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Quote Quote by julesverne
Sorry if I didn't explain myself very well..Basically, what I have to do is to calculate the generated acceleration as a function of Mach number given the initial state of the in-tube propellant and projectile geometry... using a relative simple one-dimensional unsteady flowfield model. Is that what you have to do as well?
Hi Jules Verne (I never believed me talking with such a important writter ). What do you mean with a relative simple one-dimensional unsteady flow field. The flow over a RAMAC is two dimensional.

Anyway, my target is to code the Euler Reactive Equations and obtain the three modes of functioning. Designing the projectile and geometry is left to me. A simple kinetic mechanism of Hydrogen will be surely implemented. But I have not chewed over it yet.
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Nov17-04, 10:32 AM
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Quote Quote by Clausius2
What do you mean with a relative simple one-dimensional unsteady flow field. The flow over a RAMAC is two dimensional.

Anyway, my target is to code the Euler Reactive Equations and obtain the three modes of functioning. Designing the projectile and geometry is left to me. A simple kinetic mechanism of Hydrogen will be surely implemented. But I have not chewed over it yet.
Good luck! I just have to study the subdetonative mode ;).. The 1-D modeling I'm using is for calculating the thrust (the classical thermodynamic "black box" model). The problem is that the control volume length depends on mach number, so I'm trying to figure out the induction length as a function of mach number, which would give an idea of the c.v.length variation.By the moment, I'm trying to get used to chemkin package which, according to my teachers, will help me a lot with the kinetic calculations The shock wave system is obviusly 2-D, but I'm not looking at it at the moment. I will use methane as fuel.


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