Questions tagged [liquid-fuel]
Questions regarding rocket propellant in liquid form, the main type used for chemical rockets.
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Liquid fueled suborbital rockets?
Which suborbital (sounding, balistic, amateur or else) rockets use or used liquid fuel?
I could find (with help from A. Rumlin)
New Shepard - Blue Origin - RP-1
Spica - Copenhagen Suborbitals - ...
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2answers
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Rocket fuel cost to launch 1 kg to orbit
I have 2 questions about the cost of liquid rocket fuel to launch (anything) to LEO orbit. Let's assume we use fuels used in commercial spaceflight today (probably LOX+LH2 or LOX+RP-1 etc.).
What is ...
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1answer
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Is there a distinct flame-front in a liquid-fuelled rocket combustion chamber?
Liquid fuel and liquid oxidizer are injected at high pressure through small orifices into the 'top' of a rocket's combustion chamber. The intention is that these mix quickly and then burn completely ...
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2answers
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How many times is a single rocket engine tested?
When a rocket engine is loaded into a test stand is it tested once before removal or is it allowed to cool and then tested again. Is every liquid-fueled rocket motor that flies to space first tested ...
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3answers
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Can liquid rocket engines have the same thrust as solid rocket engines?
Take the Vega rocket launcher for example. Its first three stages are solid rocket engines and burn at a relatively short time. If I were to change its first stage into a liquid rocket engine, can ...
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1answer
36 views
What is the effect of calorific value of fuel on the specific impulse of a rocket engine?
What is the effect of calorific value of a fuel on the specific impulse of a rocket engine? Other things remaining the same, and if it is possible to use both, will the same fuel provide the same ...
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5answers
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Using of the rocket propellant for engine cooling
Why does liquid space propellant make a good engine coolant? I was researching the regeneratively cooled nozzle and combustion chamber on the Merlin 1D when I found this out. I do know that the pipes ...
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Why didn't propylene fly? (Vector)
Ars Technicha's Rocket Report: SLS has technical problems, Vectorāyes, Vectorāis back links to Vector restarting operations under new ownership which says:
One thing they did wrong was the technology ...
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1answer
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Concerns/challenges with LOX as a regenerative coolant
What are the fundamental issues that make LOX as a regenerative coolant difficult to work with or less ideal than using fuels as a coolant instead in small scale engines (<7000lbs of thrust/ ...
4
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1answer
82 views
How to experimentally determine the degree of atomization of the propellants mixing in a fuel injector?
When validating a fuel injector design on a test stand using liquid water to simulate a liquid-liquid fuel injector(the one i'm working with currently is a pintle design but I suppose one could ...
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Do the SpaceX Falcon-9 rockets use foam insulation similar to the Space Shuttle? Is it still a potential problem?
The Space Shuttle used polyurethane and polyisocyanurate foams for insulation. A chunk of foam breaking off during launch resulted in the Space Shuttle Columbia disaster.
Do all chemically-fueled ...
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1answer
96 views
At which pressure does a liquid fueled rocket start producing supersonic flow?
In a compressed-tank LOX+ethanol (or similar liquid fuel) rocket:
How much should the tank or combustion chamber pressure (which should be the same) be to have a significant exhaust velocity increase ...
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How do Falcon-9's cold gas thruster maneuvers account for the center of mass changes due to “floating fuel shifts”?
The Art of Engineering video How SpaceX Lands Rockets with Astonishing Accuracy after 07:19 explains:
Cold Gas Thrusters
The falcon 9 is equipped with a total of ...
5
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1answer
406 views
How much does launch costs have to come down to make chemical fuel deep space probes feasible?
Considering that NASA have been running short of plutonium for their RTGs, it makes sense to consider alternatives.
For the inner solar system up to Jupiter, solar cells have been demonstrated on ...
3
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1answer
51 views
How to predict reaction of propellants at chamber temperature and pressure? [duplicate]
I would like to understand how to calculate the complete reaction of propellants at chamber temperature and pressure.
For instance taking ethyl alcohol (75%) and LOX combustion with mixture ratio of 1....
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1answer
536 views
why do under-expanded engines have less than ideal thrust?
I've been looking into rocket propulsion a bit and got stumped on something. I read that the thrust generated by an engine can be determined by the following:
$$
F = \frac{w}{g}v_{e}+A_{e}(P_{e}-P_{a})...
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1answer
165 views
Is methylsilane CH6Si ever considered as fuel in rocketary?
Methylsilane CH6Si seems to have some useful properties for rocket fuel:
High hydrogen content, 6 atoms per molecule, 13% of overall mass,
High combustion energy, -2612KJ/mol or 56.8 MJ/kg (better ...
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4answers
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Why can't cryogenic oxygen and cryogenic kerosene be “stored” together?
This question, to my knowledge, is only applicable to Rocket Lab's Electron, pressure-fed engines that use non-hypergolic fuels, and other engine cycles that don't use a fuel/oxygen-rich preburner. My ...
7
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1answer
568 views
Why is RP-1 dyed red?
I was interested to learn that RP-1 is at least sometimes dyed to a red color.
What is the reason for doing this / what benefit does it give compared to leaving it the usual hydrocarbon clear-to-...
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1answer
200 views
Fat as hydrocarbon rocket fuel?
Have fat/grease or fatty acids ever been studied as a liquid rocket fuel?
(I don't expect it to be a good rocket fuel, but I wonder if anybody has ever burned it in an engine or made a serious study ...
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1answer
459 views
What is the MXP-351 storable bipropellant?
Masten Space Systems has a proprietary hypergolic bipropellant called MXP-351 intended for use in the XL-1 lunar lander. We seem to know the following information:
Non-cryogenic, with storage life of ...
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1answer
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What actually is RP-1, and how is it different from any other hydrocarbon liquid fuel?
Related: Russian "kerosene" versus American "RP-1", however that's more about the details of specific rocket kerosene specs than rocket kerosene in the context of hydrocarbon and ...
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1answer
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Do mixture ratio always need to be constant throughout the flight?
What factors can change the mixture ratio of propellant? I think they can be changed to control the thrust of a rocket.Stay safe.
EDIT:What about considering only one stage? Do they change or can they ...
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0answers
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How are cryogenic fuels and oxidizers generated and procured?
I understand hydrogen can be generated from steam-methane reforming or from electrolysis of water and then cooled to liquid through a series of cryogenic coolers. For steam reforming, the hydrogen ...
10
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1answer
652 views
How are fuel/hydraulics pipes coupled in spacecraft?
How are pipes coupled in spacecraft?
I found Shape memory alloy pipe couplings (SCoup, see image taken from link) are sometimes used.
-Is this still the case and in what quantity are they used?
-...
3
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2answers
197 views
Bio-Fuel for Rocket Science
In season 1 of the 2018 Lost In Space Series which aired on Netflixā the last Episode has the Robinson family using the by-products of living beings (faeces) as biofuel. If we were to use the same ...
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1answer
301 views
How did JPL detonate a liquid oxygen methane mixture with light?
This answer to Pre-mixing cryogenic fuels and using only one fuel tank quotes John D. Clark's Ignition! Chapter 11: The Hopeful Monoprops, and the quote includes the line:
How he avoided ...
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1answer
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What is the density of supercooled LOX at ā206 °C, as SpaceX uses it
I want to calculate the size in cubic meters of Starship's propellant tanks. The only figures for LOX I can find are at ā183Ā Ā°C. 1141.7Ā kg/mĀ³ at ā183Ā Ā°C. Could somebody please calculate it at ā206Ā Ā°C,...
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Is it possible to use gases instead of liquids as fuel in a rocket engine?
Im reading about rocket engines and I have a question about is it possible to use fuels in the form of gases than a liquid in a rocket engine?
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3answers
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Rocket explosion compared to kT of TNT; has one ever knocked something over at a distance?
The energy equivalent of 1 gram of TNT is about 1 kcal or large Calorie. For reference, 1 gram of carbohydrates gives us almost 4 Calories of energy (if we are lucky enough to use it and not store it)....
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1answer
179 views
Why did Virgin Galactic decide to use a hybrid engine vs liquid on their space ship?
To me, it seems like their business case is very dependent on rapid reuse. With this in mind, using a hybrid engine that would need to be replaced every flight seems very counter intuitive vs a liquid ...
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Are there examples of a spacecraft designed for transitions from supercritical to liquid+gas mixtures?
The question What happens when supercritical fuel tanks deplete below critical point? suggests some possible scenarios when the pressure of a tank is in danger of dropping below the supercritical ...
3
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1answer
283 views
What's the viscosity of chilled RP-1?
I would like to compare the viscosity of "chilled" RP-1 as it is used for Falcon 9 launches to that of some everyday fluids. However, I am unable to find this information elsewhere. Would you please ...
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2answers
2k views
Do liquid propellant rocket engines experience thrust oscillation?
I know SRBs have a quite bit of thrust oscillation, and it's pretty much part and parcel of burning solid propellant. Do liquid-propellant engines experience something similar albeit at a much smaller ...
3
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1answer
170 views
Are these sliding ullage bulkheads in the OTRAG rocket? How do they seal?
This answer to Were there any non-state organizations to organize space flight and colonizations in the second half of the 20th century? mentions OTRAG and links to Astronautix's OTRAG page.
The ...
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2answers
434 views
Do any rocket engines besides the F1 need/require baffles?
The F1 engine required baffles on the injector plate to control combustion instabilities so that it wouldn't blow itself up. Was that unique? Or do other engines also have baffles for the same reason? ...
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1answer
310 views
Does this Soyuz vehicle burn coal or oil? What is its official name?
This tweet shows the image below and says:
Soyuz rocket on its way to the launch pad (on a train of course).
Question: Does this Soyuz vehicle (a train engine) burn coal or oil? Does it have an ...
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1answer
653 views
Why can't an expander-cycle engine be built to use RP-1 or other non-cryogenic fuels?
The expander cycle family of rocket-engine power cycles involve using waste heat from the engine's combustion chamber and/or nozzle to vapourise some or all of the engine's fuel, and using the now-...
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1answer
86 views
Could LNG fuel be used to pressure feed itself into combustion chamber?
In pressure fed cycle a high pressure gas tank contents are exhausted into the fuel and oxidizer tanks to essentially push them into the combustion chamber.
Could a portion of the fuel from an LNG ...
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1answer
169 views
Chamber pressure of a gas pressure fed liquid rocket motor
I am studying rocketry and am currently learning about pump fed vs gas pressure fed propulsion systems.
Upon reading about gas pressure systems, I googled the formula to find the chamber pressure for ...
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1answer
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How did sloshing prevent the Apollo Service Module from moving safely away from the Command Module and how was this fixed?
The Insider.com article 'We could have lost the Apollo 11 crew:' A once-classified anomaly nearly killed NASA's first moon astronauts, a new book reveals describes a problem during reentry of several ...
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1answer
187 views
Are rocket fuels and LOX pure or are there additives?
I wonder whether there are any small amounts of additives in rocket fuels such as hydrogen and kerosene, or to the liquid oxygen, or if they are absolutely pure (barring any unintentional ...
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2answers
219 views
Oxidizer Line Pressure of DIY Hybrid Rocket Engine Limits Thrust?
So Iāve seen engines like these which use gaseous oxygen as an oxidizer and then a solid tube as a fuel. But do these types of hybrid engines have any possibility of creating a useful amount of thrust?...
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1answer
665 views
Why canāt cryogenic propellants be storable, at least on the ground, via refrigeration?
Cryogenic fuels (liquid hydrogen, liquid methane)1 and oxidisers (liquid oxygen)2 are the rocket propellants of choice where raw performance is the overriding concern, due to the very high performance ...
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How much more hardware is needed in a cross-fed CBC rocket than a non-cross-fed one?
Is it just a matter of adding a multi-in fuel manifold?
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Why doesn't Rocket Lab use a solid stage?
I was just reading about the Scout, an all-solid rocket, and thought of Rocket Lab's Electron, which seems to have a similar mission of deploying small payloads to orbit. I understand the engines to ...
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1answer
193 views
What kind of methane-fueled rocket engines exist?
I have heard of methane being a strong contender for Mars and beyond. Methane is a cryogenic fuel and is said to have a high specific impulse, and work with closed- and open-expander cycles. I have ...
3
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1answer
241 views
How much fuel/oxidizer was held in the piping of the Shuttle orbiter?
The space shuttle main engines were in the orbiter portion of the vehicle, but fed fuel (LH2) and oxidizer (LOX) from the external tank. Suppose the external tank is ejected before the LH2 and LOX ...
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2answers
300 views
Can Amateur Rocketeers use Liquid Nitrogen Dioxide as oxidizer?
I was reading similar question as mine here. But no one talked about Nitrogen Dioxide (NO2). Its boiling point is 21C. So easy to store. But how easy it is to handle compared to Hydrogen Peroxide or ...
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0answers
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LOX as annular heat sink
I'm thinking of my time spent working with cryostats. Liquid helium pot on the inside, and surrounded by a liquid nitrogen jacket. And the whole thing insulated with vacuum and superinsulation. (...
