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VAPAK-technology

Posted by: Ekkehard Augustin - Fri Sep 16, 2005 11:27 am
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VAPAK-technology 
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Post VAPAK-technology   Posted on: Fri Sep 16, 2005 11:27 am
How does VAPAK work? I am trying to imagine how it feeds NO2 or any other propellant without any moving part.



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Post VAPAK-technology   Posted on: Fri Sep 16, 2005 12:05 pm
When the vapour pressure of the liquid propellant at the top of the tank exceeds the chamber pressure, the liquid can be pushed out of the tank by its own vapour instead of a seperate pressurizing gas. If needed, keeping the top of the tank warmer than elsewhere can achieve this without boiling occuring before the chamber. The only real moving part is the valve that allows the flow.


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Post    Posted on: Fri Sep 16, 2005 12:27 pm
Hello, nihiladrem,

Thank You Very Much for the explanation. This sounds to me as if it is very simple and is a much less expensive method than pumps etc. and especially less expensive than I thought.

I asked for it because of the CXV-cost-thread in the Financial Barrier-section.



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Post    Posted on: Thu Aug 21, 2008 3:50 pm
According to Air Launch LLC's document "" ( )
Quote:
When liquid is removed from the tank, the pressure in the vapor phase drops below the saturation point; as a result the liquid boils and the released gas repressurizes the vapor phase. The behavior can be tailored by selection of initial propellant loading conditions, making the system very adaptable to changing requirements and easy to scale.
.

This sounds as if VAPAK provides flexibility at a very high level.

Air Launch LLC also list
Quote:
precise final orbit injection
and says that
Quote:
In conjunction with appropriate engine design, the resulting systems are equally useable for trans-atmospheric or in space operations
.

Very useful interesting information.

What about it?



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Post    Posted on: Wed Oct 22, 2008 6:36 pm
On high thrust application a heat exchanger may be used. Portions of both the Fuel and Oxidizer flow through heat exchangers attached to the thrust chamber and then back to their tanks as gases.

This can provide very high pressure but will require quite heavy tanks.

Both AirLaunch and CVX seem to use quite low pressure Thrust Chambers which will lower their ISP by 50s or so from turbopump designs.

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