Questions tagged [pressure]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
4
votes
1answer
97 views

What effects did the different air pressure and air composition in certain spacecraft have on astronauts?

The Mercury and Gemini spacecraft, and in space the Apollo spacecraft, didn't pressurize their cockpits to 1 atm with Earth-like atmospheric composition, but instead to pure oxygen at much lower ...
0
votes
0answers
56 views

Relationship between scaling up rocket, adding more engines and pressure inside tanks, feedlines

So can anybody say, what is relationship between scaling up rocket ( more payload to orbit ) adding more engines and pressure inside rocket tanks, feedlines. What is standard pressure inside F9R 1st ...
2
votes
2answers
110 views

What was pressure and temperature of LM oxygen tanks?

After analysing comments in related question How cryogenic oxygen was heated up for CM cabin repressurization? It appears that LM had oxygen stored as either gas or supercritical fluid but not at ...
0
votes
2answers
88 views

Can we create a vacuum inside an EVA suit when the outside is pressurized, will it implode?

EVA suits are specially designed spacecrafts for astronauts during spacewalks. I can say for sure, it can handle the following cases of pressurization of the system: Pressurized inside, but vacuum ...
4
votes
1answer
105 views

Is the risk of depressurization greater in atmosphere than in orbit?

This question inspired by a short Twitter exchange with @thehighfrontier about clothing for Spaceship Two passengers. Crews of particularly high-flying aircraft wear full pressure suits. So do ...
1
vote
0answers
29 views

How would a hybrid motor N2O propellant tank control pressure?

Cryogenic engine prop tanks vent in order to control tank pressure. Thermal energy that (inevitably) gets conducted into a cryo tank raises the propellant enthalpy and so the pressure of the critical ...
0
votes
1answer
69 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 ...
2
votes
1answer
99 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 ...
2
votes
2answers
145 views

Oxidizer Line Pressure of DIY Hybrid Rocket Engine Limits Thrust?

So I’ve 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?...
4
votes
1answer
146 views

Sulphur Hexafluoride atmosphere for Ceres?

So, I have read that the escape velocity of Ceres is 514 m/s, and orbital velocity(for a low orbit) is 360 m/s... Now, the RMS(Root Mean Square) velocity of Sulphur Hexafluoride at 72 $^o$F (23 $^o$C,...
0
votes
1answer
122 views

Ambient pressure for vaccum nozzle design

How do I find out the ambient pressure for designing a vaccum rocket engine? I am using the propellant combustion charts from the braeunig website. But I cannot figure out the ambient pressure for ...
2
votes
2answers
217 views

Could an Igloo work on Mars?

Could ice make a good habitat like an igloo for colonists or as cold storage for fuel? Could the cavern be sealed and then carbon dioxide melted to create pressure inside the cavern to grow plants or ...
1
vote
0answers
60 views

How does temperature affect a solar sail?

Is there an ideal temperature which solar sail material operates at? Does a colder reflective surface create more thrust? Related: How will JWST manage solar pressure effects to maintain attitude and ...
4
votes
1answer
94 views

How do pressure fed and pump fed systems compare at different scale of rockets

Rocket Design is all about optimising mass, within cost constraints while accepting a certain amount of risk. Both pressure fed and pump fed systems have their pros and cons, but how do they compare ...
3
votes
1answer
260 views

How can I calculate the density of Mars' atmosphere during dust storms?

I have been searching to try to estimate the air density of the atmosphere on Mars during a dust storm. I am trying to use this dynamic pressure equation to calculate the pressure on a theoretical ...
1
vote
1answer
602 views

How to drink water on Mars?

There are craters filled with water on Mars as shown below. If fresh water is found, how would astronauts drink the water? Can the Apollo a spacesuit food/drink port be used to equalize the pressure ...
1
vote
0answers
108 views

Cryogenic liquid pressurization resulting in overpressurized tank

I want to pressurize a cryogenic liquid (LN2 in this test. Eventually LOX). I have a setup similar to this and follow a similar procedure to what is described, but I don’t see the same tank pressure ...
2
votes
0answers
44 views

What are some common exit pressures for liquid propellant engines?

Most engines are overexpanded at launch so that they reach peak efficiency at altitude. It’s easy to find values for thrust, specific impulse, expansion ratio, chamber pressure, etc, but I’m trying to ...
4
votes
1answer
318 views

ISS Destiny Module inner wall: thickness set by internal atmospheric pressure or by mass density needed for meteor shielding?

In their 2006 paper Christiansen et al. describe the "stuffed Whipple shield" wall of the ISS's Destiny Module. The outer skin, the Whipple shield's "bumper" layer, is a thin layer of aluminum (alloy ...
0
votes
0answers
307 views

What would happen if an astronaut walked on mars without a spacesuit i.e. wearing just earth clothes? [duplicate]

Which will happen first: Would she die due to lack of oxygen/suffocation or due to lack of pressure/boiling bodily fluids?
3
votes
0answers
106 views

Reliability of self pressurization of propellant tanks for liquid engines

In a cryogenic propellant tank, the liquid always continuously changes into gas which pressurizes the tank. To pressurize the tank more we can run the liquid through the pipes along the outer wall and ...
14
votes
1answer
1k views

What is the advantage of using Helium over Nitrogen when used for pressurising LOx?

In this Twitter post of the plumbing line diagram(left half) by LauncherSpace, one can notice that Helium is used for pressurising LOx while Nitrogen is used for pressurising Kerosene. Why the ...
24
votes
4answers
5k views

How could the 2018-08-30 Soyuz MS-09 / ISS leak be so slow?

The leak reportedly led the ISS to lose 0.8 millibars of air pressure per hour, which is both big considering what was at stake and low for a 2-mm hole when the outside is near to complete vacuum. Am ...
8
votes
2answers
719 views

What is the deepest place on Mars? Do humans need pressurized suits there?

Is there any particular deep area, trench, fissure, lava tube or otherwise on of Mars in which a person could survive with only an oxygen supply? How deep would plants or animals have to be in Mars ...
3
votes
1answer
2k views

Temperature and pressure of rocket exhaust

What is the temperature and pressure of the exhaust that comes out of the rocket during the last three seconds of countdown (smoke that stays near ground)? How much carbon dioxide is there in that ...
2
votes
1answer
640 views

Mass, Chamber pressure and cooling type of Rutherford Engine

What are the specifications of Rocket Lab's Rutherford Engine used by the Electron Rocket? I'm looking for the chamber pressure, propellant mass flow rate, type of cooling for the nozzle, size of ...
1
vote
1answer
72 views

Pressure queries on turbopumps

In the turbopump used in liquid rockets, the stagnation pressure rise is definite. But then the question comes: Whether static pressure rises or dynamic pressure rises or both rise? If both rise ...
1
vote
1answer
37 views

How to analytically estimate the pressure loss through an liquid injector?

A simple orifice and a pipe have well-documented pressure loss calculation. But when an injector has complicated flow patterns, is it possible to break it down into simpler sections by which the ...
7
votes
1answer
144 views

How much does pressure on Mars change with weather?

A great answer about the Mars atmosphere and water triple point shows there is a region on Mars where clean liquid water slightly above 0°C can exist on the surface. I still wonder, though, how ...