#rocket nozzle

[fish-paul-society]

F.L.U.D.D if it got a Mario & Luigi Boss treatment. Cuz it's surprising Egad didn't made something like that.

[fuckyeahfluiddynamics]

Soyuz Exhaust

Here, a Soyuz rocket takes off in 2023, carrying three of the Expedition 70 crew to the International Space Station. This initial stage of the Soyuz launch vehicle uses four identical rocket boosters lashed around the second stage core.  (Image credit: NASA) Read the full article

[fuckyeahfluiddynamics]

Anyone who's used a can of compressed air to clean their computer or keyboard knows that the can quickly gets quite cold to the touch. (Image and video credit: Minute Physics)

[fuckyeahfluiddynamics]

Rockets operate on a pretty simple principle: if you throw something out the back really fast, the rocket goes forward. Practically speaking, we accomplish this with a combination of chemistry and physics, by burning fuel and oxidizer together and accelerating the exhaust out a nozzle. Solid rocket propellant, like that found in the model rockets shown here, is a combination of fuel and oxidizer that don’t react until they’re ignited. You don’t want your rocket to just explode as soon as it’s lit, though, so solid rocket motors are carefully designed to burn in a particular way. By packing the propellant into different shapes -- and even including patterns of propellants with different burn rates -- engineers can create a rocket that burns with the thrust pattern they want. 

In the case of this model rocket motor, what we observe is not really how it is intended to burn; you can see how some of the combustion products are working their way out of cracks that wouldn’t normally exist. But the video and animation do show how the burn front moves gradually through the engine, allowing it to produce a relatively steady amount of thrust for a longer period before reaching the darker burning propellant on the left, which would normally launch the model rocket’s parachute. (Image and video credit: Warped Perception; via Gizmodo)

[thinkflip]

Kyll Schomberg’s article “Analysis of a Low-angle Annular Expander Nozzle” was published in Shock and Vibration (dx.doi.org/10.1155/2015/675861), you can read online, no subscription required.

“An experimental and numerical analysis of a low-angle annular expander nozzle is presented to observe the variance in shock structure within the flow field. Results were compared with an equivalent converging-diverging nozzle to determine the capability of the wake region in varying the effective area of a low-angle design. Comparison of schlieren images confirmed that shock closure occurred in the expander nozzle, prohibiting the wake region from affecting the area ratio. The findings show that a low angle of deflection is inherently unable to influence the effective area of an annular supersonic nozzle design.”

[thinkflip]

Kyll Schomberg at the 2014 AIAA Propulsion and Energy Conference

FLIP PhD student Kyll Schomberg reports:

I recently attended the AIAA Propulsion and Energy 2014 forum in Cleveland, Ohio. The event combined both the 50th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and 12th International Energy Conversion Engineering Conference with participants from a number of international academic and industrial institutions. The event featured a range of plenary panels, keynote speakers, technical forums and paper presentations.

I was fortunate to present two papers on nozzle design and efficiency. One on the Design of High Area Nozzle Contour Using Circular Arcs that highlights the potential for a reduction in nozzle length (and therefore engine weight) without reducing performance and another paper on a Geometric Analysis of the Linear Expansion-Deflection Nozzle at Highly Overexpanded Flow Conditions that identifies the relationship between nozzle geometry and efficiency in the altitude-adaptive expansion-deflection nozzle concept.

Highlights of the conference were Al Romig’s keynote address on the history of Lockheed Martin with a focus on the Skunk Works, the town hall forum with Technical personnel from Blue Origin, Virgin Galactic, SpaceX and NASA Marshall and speaking to one of the engineers that was involved in the development of the Vulcain 2 core stage engine used in the Ariane 5 launch system after my talks.

Some pictures from the event, courtesy of AIAA:

[spockvarietyhour]

[deathdefyinglifeleaps]

This was a rocket nozzle designed as a senior project before I started college. Just another thing we get to play with/learn about.