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Questions tagged [oxidizer]

Should be used for question pertaining to part of propellant that is used to ignite the fuel.

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Theoretical viability of a liquid rocket engine concept [closed]

[DISCLAIMER: I am an aerospace engineer undergrad and I do NOT want to build this. I wanted to come up with an alternative for the usual hypergolic mix so US military personnel would have one less ...
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Is there any satellite that uses LOX as oxidizer?

With Liquid Oxygen being used as an Oxidizer in Starship and some other rocket engines, I was curious if LOX was also used for propelling satellites as well.
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Propellant consumption of Starship trip from NRHO to Mars

People, I am trying to estimate the amount of propellant (liquid oxygen+ liquid methane) required by Starship to reach Mars from NRHO (Near-rectilinear halo orbit). Also the propellant consumption ...
Prayag's user avatar
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Are there any storable non-hypergolic oxidizers?

Any list of bipropellant rocket fuels I've come across has oxidizers that are either cryogenic (liquid oxygen), hypergolic (nitric acid), or both (liquid fluorine). Are there any practical rocket ...
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Which are more efficient: oxidizer-rich or fuel rich rocket engines?

Several internet articles claim that the high Isp of the Soviet RD-180 engine (as used in the Atlas III and V launch vehicles) was (at least partially) due to the fact the RD-180 ran oxidizer-rich, ...
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Why do $\text{CH}_4$ (Raptor) engines produce less soot than RP-1 (Merlin) engines?

SpaceX's Merlin engine, which burns RP-1 and LOX, has soot visible after the first stage lands. Many articles on the web say SpaceX's Raptor engine, which burns methane and LOX, is clean. ...
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Can the higher oxides of nitrogen, like nitrogen pentoxide, be used as oxidisers in rocket engines?

Both nitrous oxide (N2O) and dinitrogen tetroxide (N2O4) are used in storable propellant combinations, so, simply as a continuation, can the higher oxides of nitrogen (N2O5, N2O6, etc.) still be used ...
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Can rocket engines which use hypergolic propellants be augmented with LOX for increased efficiency?

Hypergolic rocket engines typically use NTO and hydrazine based propellants. Wikipedia page on Liquid Rocket Propellants shows N2O4 and N2H4 at 1.36 ratio to have 286s Isp at sea level. My question is ...
Ashvin's user avatar
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Was liquid ozone + fluorine ever tested as an oxidizer? Ever with jet fuel?

Searching for ozone layer circa 1957 I got Theoretical Rocket Performance of JP-4 Fuel with Mixtures of Liquid Ozone and Fluorine, NACA RM E56K14, Issue 58, Volume 63, Vearl N. Huff, Sanford Gordon. ...
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Injector design - LOX vs nitrous oxide

What will be the main design differences between using liquid oxygen and liquid nitrous oxide as oxidizer in a bi-propellant rocket engine? What liquid/gas properties (vapor pressure etc.) play the ...
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Highest Isp achieved with nitrous oxide as oxidizer

What is the highest Isp achieved on orbital rocket for an engine that used nitrous oxide as oxidizer? Both hybrid and liquid engines can be considered. Not considering nitrous oxide monopropellant ...
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What is the products of a catalyzed reaction between Hydrogen Peroxide and Ethanolamine with Copper(II) Chloride?

I found this article about Hypergols, specifically H2O2. It mentions in table 3 and in the body of the paper that they found that Ethanolamine with Copper Chloride reacted vigorously. In my search for ...
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How stable is ozone as a compressed gas?

I have heard that liquid ozone is violently unstable, making it unusable in any meaningful concentrations. Would using it as a compressed gas partially solves the problem? What is the mechanism of its ...
Rossen Angelov's user avatar
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Dinitrogen tetroxide decomposes to nitrogen dioxide at room temperature, but rockets that use it are usually said to use N₂O₄ and not NO₂ - why?

To the best of my understanding, both dinitrogen tetroxide and nitrogen dioxide are usable and perform quite similarly as oxidizers, but rockets that use either are almost always said to use ...
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Why can I not use stoichiometry to calculate the O/F ratio of my rocket? [duplicate]

I am attempting to calculate the oxygen to fuel ratio (O/F) for my hybrid rocket engine (paraffin wax and gaseous oxygen). I know I can use the oxidizer to fuel equation to calculate this, but my ...
Joaquin Revello Lerena's user avatar
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Why don’t any engines use turboelectric oxidiser pumps?

Most larger liquid-fuelled rocket engines1 use fuel and oxidiser turbopumps driven by the hot, high-pressure gasses produced by burning said fuel and oxidiser: The gas-generator cycle burns some of ...
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Is there any practical application of trinitramide N(NO2)3 in rocket propellants

In 2010 researchers at the Royal Institute of Technology (KTH) in Sweden announced the discovery of new compound, trinitramide N(NO2)3, which could revolutionize production of solid rocket propellants....
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HTP as oxidizer for main propulsion

Please anyone elaborate why hydrogen peroxide is not used as an oxidizer for main propulsion. I see that everyone agrees on this but from my point of view its a big flaw. I think that industry has ...
Silverback's user avatar
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Why did the Agena-D leak oxidiser when starting its engine?

The Agena-D upper stage, although extremely reliable, had a tendency to leak some of its RFNA oxidiser when starting its Bell 8096 engine; although not a problem for a stock Agena-D, it did cause ...
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Could H₂S₂O₈ (peroxydisulfuric acid), made in the clouds of Venus, be used for making a propellant?

The salts of the peroxydisulfate ion, S$_2$O$_8$$^2$$^-$, are strong oxidants like the perchlorates that are used in propellants for rockets. In this answer on Chemistry stackexchange is a link to a ...
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Can LOX containing hydrogen peroxide be used as an oxidizer for a liquid fueled rocket?

While searching the internet for designs on liquid fueled rocket engines, I noticed that some bottles of liquid oxygen say they contain some percentage of hydrogen peroxide. Could that be used as an ...
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How do you avoid wasting oxidizer when designing a hybrid rocket?

I was thinking of designing a very simple and small Paraffin rocket engine as an experiment. One thing that I don't understand about these designs is how you efficiently use your oxidizer without a ...
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Other than He and N as pressurizing gases

To pressurize the liquid propellant tanks Helium is most widely used and after that Nitrogen. Helium is quite costly and Nitrogen is economic but it messes with the O/F ratio of the engine (ref). So, ...
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Propellant filling rate in propellant tanks [closed]

I want to pump LOX into a pressure vessel at 2 bar (say). So for pumping it what should be safest flow rate?
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Why does the 2nd stage of Falcon 9 need compressed He tanks?

It is well known that the rapid disassembly of Falcon 9 static testing started with the rupture of the composite fibres of the copv He tanks. But what is the need to have the composite tanks ...
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Why aren't airbreathing SRBs a thing?

To the best of my knowledge, all solid rocket boosters so far use a propellant that is a solid mixture of both the fuel and the oxidiser parts of the reaction. However, given that SRBs are generally ...
Vikki's user avatar
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8 votes
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What are the energy-to-mass ratios of some fuels/oxidizers, when including the oxidizer?

Energy-to-weight ratio is an important parameter. We would like it to be high so we don't have to carry around much fuel. Maybe you've heard some of the numbers for common fuels. Hydrogen is about ...
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What are the advantages of Ox-rich staged combustion?

In the context of staged combustion, I understand that burning ox-rich creates complications associated with having hot, high pressure, oxidizer. Some engines, notably the RD-170 and RD-180 family run ...
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Could you use Helium as an oxidizer? [closed]

I am trying to create an HRE (Hybrid Rocket Engine) and i am trying to find the best oxidizer. Do any of you have experience with using helium?
Coen van Woudenberg's user avatar
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2 answers
7k views

There are better oxidizer than oxygen?

Liquid oxygen is cheap to obtain and available, but are there better oxidizers to achieve bigger thrust with JP1?
Antonio Cipolla's user avatar
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3 answers
1k views

Is nitrous oxide hypergolic with anything reasonably safe and obtainable?

Can I start an amateur rocket using nitrous oxide as either oxidizer or monopropellant, using a hypergolic slug of something reasonable for use by an amateur rocketeer? What substance could it be?
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Using ozone as oxidizer

The bond energy of $O_2$ is 498kJ/mol. The bond energy of $O_3$ is 364kJ/mol. That means the energy to break up the particles into 3 moles of monoatomic oxygen (which then binds with fuel to release ...
SF.'s user avatar
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Why does Juno use "mixed oxides of nitrogen" oxidizer for propulsion? Which ones?

In the recent Spaceflight 101 article Rocket Burn postponed for NASA’s Juno, to remain in elongated Jupiter Orbit until December it says: Juno uses a bi-propellant main propulsion system with ...
uhoh's user avatar
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Are there any complications of the position of the oxidizer injector on Orbitec's vortex rocket engine?

Orbitec's vortex rocket engine injects oxidizer from near the nozzle up the wall of the engine chamber in a vortex. The oxidizer injector being in this position seems unusual. Are there any ...
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4 votes
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Would LOX+$NO_2$ or LOX+$N_2O_4$ make a good oxidizer mix?

We know that oxygen is the "king" of oxidizers: non-toxic (unlike fluorine) cheap only an oxidizer (potassium nitrate, for example, comes with K and N which aren't what we want) no need for catalysis ...
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1 answer
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Different LNG (methane) combinations with oxidizer

I was looking up oxidizers in two aspects, economy and power. Since much of math goes over my head, I got almost nothing. What would be most economical and most powerful potent oxidizer choice ...
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7 votes
1 answer
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Specific Energy counterpart for oxidizers

Where it comes to fuels, Specific Energy and Energy Density are two major quantities deciding "how good" given fuel is. These are either given neglecting the oxidizer mass, or as a value combined with ...
SF.'s user avatar
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How long can a vehicle stay fueled before the liquid oxygen gets too warm?

On February 28 2016, Falcon 9 attempted a second launch for its 22nd flight. However, it was put on hold for about 20 minutes at T-01:33 and had its countdown reset to T-11:44, giving a total of about ...
isanae's user avatar
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6 votes
1 answer
768 views

Is a fluorine/hydrogen engine feasible for use in space? [duplicate]

Fluorine is a bit more efficient chemically than oxygen. It has never been used as a launcher oxidizer because it and its exhaust products are so toxic. That's as much I've heard about it anyway. But, ...
LocalFluff's user avatar
14 votes
2 answers
3k views

Disposition of the Oxidizer Tank in Rockets with Autogenous Pressurization

A little while ago, Ars Technica did a big story on the Firefly rocket under development. http://arstechnica.com/science/2014/11/firefly-space-systems-charges-full-speed-toward-low-earth-orbit/2/ A ...
AlanSE's user avatar
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5 votes
2 answers
388 views

Could a SSTO bladder of air scooped from atmosphere improve performance?

Let's start out with an air breathing SSTO, like Skylon. These things have pretty bad mass ratios and pretty razor thin margins. Given that the engines react with the oxygen in the air during the ...
AlanSE's user avatar
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8 votes
3 answers
10k views

Are oxidizer to fuel mixture ratios based on mass or volume?

Wikipedia references the ratio of liquid oxygen to RP-1 as 2.56. Is this based on mass or volume? Are they using some typical combustion chamber pressure?
kim holder's user avatar
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