Talk:Ramjet
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Referencing and citation: criterion not met
Structure: criterion met
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This article may be too technical for most readers to understand. Please help improve the article to make it understandable to non-experts, without removing the technical details. The talk page may contain suggestions. (September 2010) |
[edit] Great new graphic, but
The new graphic is great but it couldnt be hello good samaratin in two ways. 1) it lacks a flameholder, usually just drawn as a zigzag line. 2) Most importantly, the design shown is supersonic, therefore it needs a converging-diverging exhaust nozzle to induce supersonic exhaust.
Finally, a subsonic rendition would be nice, with simple diverging intake diffuser and converging exhaust
- Comment 2) is not strictly true! Even a convergent nozzle can generate a supersonic exhaust plume. The gross thrust is calculated at the throat as follows:
- Fg = w.Vj/g +Aj(pj-pamb)
- The first term is the momentum thrust, which generates the bulk of the thrust, whereas the second term is the residual pressure thrust. Ideally, a convergent-divergent nozzle will expand the flow so that there is zero pressure thrust (i.e pj=pamb) and all of the thrust is from the momentum term. Depending on nozzle pressure ratio, a con-di nozzle produces more thrust than the corresponding convergent unit. On a rocket motor the advantage is very large, because of the high nozzle pressure ratio. The advantage on a turbojet/turbofan is usually marginal, because nozzle pressure ratios are quite low. Ramjets are somewhere in between. :) Burbank 17.09 January 9 2006 (UTC)
The picture of the "low speed Ramjet" is worthless. That is NOT a ramjet. It's more of a space heater than anything else. A ramjet produces thrust, while theirs does not. It does not operate like a ramjet in any sense of the word. I removed the picture of it since it is misleading and doesn't contribute anything to an article about ramjets. Maybe it will be useful in an article about space heaters.
[edit] Youtube
Put this link to the article? http://www.youtube.com/watch?v=duHJjcMAoWM&feature=related 84.56.62.55 (talk) 10:46, 22 February 2008 (UTC)
[edit] Priciple of operation
I am wondering how the forward thrust results in detail. Naively looking one could assume that the combustion generates thrust symmetrically forward through the outlet and backward through the inlet which compensate themselves to zero. Can someone explain where the mistake is in this idea? I assume hat has something to do with requirement for preexisting forward speed and the asymmetries in geometry of the chamber, but how does it work in detail? I think somewould who knows should add an explanation of the priciple of operation to the article. 141.58.5.24 (talk) 10:00, 16 August 2010 (UTC)
