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Questions tagged [thermodynamics]

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3
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1answer
218 views

Parker Solar probe jumping through fire?

Is the principle of passing close the Sun with the Parker Solar probe the same as if you pass your hand over a candle flame fast enough you won't get burned?
3
votes
1answer
300 views

Martian Carbon Dioxide Turbine Oxygen Generator

How much solid Carbon Dioxide can be collected in a container with the top of the container level with the ground during a Martian Winter? At the end of the winter with the container ideally full ...
1
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0answers
80 views

Would the right shape dimple heat sheild create more wake? [closed]

In this question: Would a dimpled heat shield reduce heat transfer during reentry? the answer says no it would not help more or less. My new question is would reverse dimples or bumps or a ring/s ...
1
vote
1answer
98 views

What is the maximum speed can a space rocket can travel with an air pressure of 14psi? [closed]

What is the highest threshold speed of a space rocket traveling in an air pressure of 14psi with all of its stages if they where able to leave a solo at Mach 1 or more? Related: What benefits can be ...
2
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3answers
131 views

Can you avoid thermodynamic inefficiencies in space propulsion?

In @David Hammen's answer to this question, he highlights the discrepancy between the exhaust velocity that would be achieved by converting all the chemical energy of the fuel into KE of the exhaust (...
1
vote
1answer
213 views

new nozzle design, is it a fail?

So I'm an amature rocket scientist. while having a conversation with a friend on a nozzles we though of a new nozzle: Its a double nozzle where it expands a lot and then compress. I want to put this ...
5
votes
0answers
98 views

What aerothermal effects present significant challenges in supersonic retropropulsion?

One of NASA's plans for future mars entry, descent and landing missions includes an ambitious deceleration process involving retropropulsion in a supersonic airflow environment. I know that previous ...
2
votes
1answer
305 views

Controlling Combustion Chamber Pressure

When designing a rocket engine, what degrees of freedom do you have to get the combustion chamber to a desired pressure? I assume you have mass flow rate, type and mixture ratio of fuel and oxidizer, ...
5
votes
3answers
686 views

Could thermal energy be collected by dragging a thermoconductive device against the outer atmosphere

Atmospheric reentry is notoriously a difficult and HOT endevour. Could this thermal energy be used as an alternative energy source on earth? Could this be used through some sort of orbital charging ...
5
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2answers
2k views

What does “self-pressurizing” mean in regards to propellant tanks?

I've come across this term a few times. IIRC, liquid hydrogen is "self-pressurizing", but other fuels are not. Apparently, if a propellant is self-pressurizing, we do not need to build any complex ...
18
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1answer
3k views

Why aren't the ISS's nor Space Shuttle's radiators black?

As we know, from a surprising corollary to Kirchhoff's law of thermal radiation, just as darker* objects absorb more light (and therefore energy), darker objects also radiate more light (at lower ...
8
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4answers
1k views

What is the barometric formula for a gas giant?

The barometric formula describes the atmospheric pressure depending on height and a host of other things. This formula assumes a constant gravitational acceleration over the whole height of the gas ...
6
votes
1answer
397 views

How do space-bound heaters work?

A brief follow-up to Could Rosetta have been awakened from Earth if necessary? The Rosetta FAQ writes to say Q. Was Rosetta completely shut down? Almost. Only the computer and several ...