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Questions tagged [oxidizer]

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2
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1answer
88 views

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 ...
2
votes
2answers
113 views

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, ...
3
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1answer
74 views

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?
12
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1answer
1k views

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 ...
7
votes
2answers
247 views

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 ...
5
votes
2answers
456 views

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 ...
8
votes
1answer
1k views

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 ...
-1
votes
1answer
240 views

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?
4
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1answer
2k 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?
1
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2answers
309 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?
43
votes
2answers
3k views

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 ...
4
votes
1answer
847 views

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 ...
2
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0answers
157 views

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 ...
4
votes
1answer
163 views

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 ...
1
vote
1answer
165 views

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 ...
6
votes
1answer
171 views

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 ...
11
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2answers
659 views

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 ...
5
votes
1answer
320 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, ...
12
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2answers
2k 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 ...
5
votes
2answers
293 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 ...
6
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3answers
4k 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?