Ramjet Definition and 17 Threads

I will copy paste a post i made on another forum.Its just a fun project i started and i hope people in here are going to be able to help.I am not an aerospace engineer but im studying electrical and electronic engineering so i am familiar with formulas math and physics (up to a degree of...

Does anyone know of prior work on the use of an electric fan to supply input air to a ramjet until the air speed is sufficient (~0.2 M) for normal operation? It's obviously possible, but might not be practical. The objective being the simplicity of a pulse jet without the vibration issues.

I read that a thrust augmentor can significantly increase the efficiency of a jet engine (http://www.pulse-jets.com/phpbb3/viewtopic.php?t=931). Now from my understanding, the thrust agumentor is sort of like a ramjet. Only, in this case, the cold air is being sucked in along with the hot air...

Recently, I designed (in my head) a Hypervelocity Passenger Vehicle (just a cool name for really high speed transports). I immediately ran into engine design problems ( I like designing everything stand-alone), since regular jet engines can't get to Mach 8.8 without burning up into flames, and...

Hello everyone, I am making a paper on the possible applications for nuclear fusion. One of these possible applications is a Bussard ramjet. I'm trying to calculate if Bussard ramjets are feasible, based on their thrust and the drag they experience. A Bussard ramjet would use a very big...

Halfway through my thesis on a mach 2 ramjet, and I unfortunately realize that I need 50-72 CFM to test it. The only ACs I have are 2 CFM portable pancakes. Is it possible to run say a 25 CFM AC at 50 CFM for a short period of 10-60 seconds? Is there a quantitative way to find how long the AC...

Is it possible (practical/efficient) to utilize ramjet (or scramjet) on a vertical rocket? By this I mean would it be at all practical to make a vertically traveling rocket which partially uses ramjet as a method of propulsion, or is there some property of ramjet propulsion that makes this...

Hello everyone I am trying to design a ramjet engine. For that I need measurements of its parts. Does anyone know how to calculate them or have a link to a website where I could find more information?

Hello all, I am a new member. I am a manager by trade but I hold a bachelors of science in mechanical engineering and would like to work on jet propulsion as a hobby and potentially as a part of my professional career in the future. In particular I am interested in pulse jets and ramjets. I...

Hi, I am working on investigating an idea I proposed regarding a ramjet that operates in subsonic flow (of a fixed speed) with a convergent intake. That utilizes the pressure immediately behind a standing shock-wave for compression. I have posted a link to my initial report here and I now need...

For a ramjet engine, combustion occurs at a finite Mach number M. If we know the ambient conditions like free stream Mach number and pressure and the ratio between the stagnation temperature at the inlet and exit of the combustor, how can we derive the thrust? How can we incorporate the...

Time to propose another crazy idea: the electrothermal ramjet. I was reading about Project Pluto today. I find it interesting that there is no combustion involved; just the compression of air then the expansion by heat from a nuclear fission reaction. What if we could use coils (or some other...

What airspeed do I need to ignite a ramjet?

Ramjet flame holder? Or?? Any ideas you have would be greatly appreciated. The pictures were posted on a forum and after hundreds of guesses by various forum members, one of the people that I queried, a rocket expert from Wyoming, seems to be very close in his assessment (see below)...

I wanted to get some opinions on this, I am serious considering designing a ramjet rocket hybrid engine for my 3rd year mechanical engineering degree project and have started doing the research to see exactly how much work it entails I still can't quite decide... is this a realistic project? (my...

I think i know how the ramjet works at supersonic speeds, because of the shock wave the air particles traveling through the inside of the tube converge and bump into each other and because the air cannot expand it slows down, increasing the pressure, so when the air escapes it expands very...

According to the information I have gathered on ramjets, a ramjet uses a diffuser to slow down the air thus increasing the pressure. The nozzle is used to maintain pressure in the combustion chamber. So my question is, why can't a ramjet (operating at low speeds) simply not have a diffuser at...