Propellant

In rocketry, the propellant is also the exhaust, and this means that a high energy propellant gives better propellant efficiency but can in some cases actually give lower energy efficiency.

It was thought that the spacecraft had less than two days of propellant (fuel) but in its most recent update, Astrobotic said “the rate of leak had slowed more than anticipated” and now estimate that Peregrine has about 52 hours of propellant remaining.

Solid propellant is useful for weapons systems because it can be stored longer, and because rockets that use it can be launched more quickly than ones that rely on liquid propellant, Mr. Bermudez said.

So you size your propellant tanks and your propellant loads, assuming you’re going to have that extra hydrogen boil-off.

After ignition of the cartridge primer and propellant, rapidly expanding propellant gases are diverted into the gas cylinder above the barrel through a vent near the muzzle.

As the surface of the propellant burns, the shape evolves (a subject of study in internal ballistics), most often changing the propellant surface area exposed to the combustion gases.

Because the residence time of the propellant in the chamber is short, then important amplification in energy is attainable by pulsing the nuclear core which can be directly harnessed by increasing the thrust via increasing the propellant mass flow.

Consumption of fuel or propellant A closely related (but different) concept to energy efficiency is the rate of consumption of propellant mass.

For airbreathing engines such as turbojets, energy efficiency and propellant (fuel) efficiency are much the same thing, since the propellant is a fuel and the source of energy.

Generally the liquid propellant is the oxidizer and the solid propellant is the fuel because solid oxidizers are extremely dangerous and lower performing than liquid oxidizers.

However, the total energy for a mission depends on total propellant use, as well as how much energy is needed per unit of propellant.

If it were not for air resistance and the reduction of propellant during flight, specific impulse would be a direct measure of the engine's efficiency in converting propellant weight or mass of into forward momentum.

If propellant gas is continuously added to the chamber then these pressures can be maintained for as long as propellant remains.

In this cell, hydrogen-propellant is heated by the continuous intense neutronic pulses in the propellant channels.

Note that in the case of liquid propellant engines, the pumps moving the propellant into the combustion chamber must maintain a pressure larger than the combustion chamber -typically on the order of 100 atmospheres.

The liquid propellant (or gas) flows into the combustion chamber where it is vaporized and then reacted with the solid propellant.

These rounds were "fixed", meaning that, unlike the artillery, the warhead was factory attached to the propellant, and if the warhead separated from the propellant during loading, which was not uncommon, the crewmen were instructed not to load the round.

The spacecraft's thrusters fired thousands of times during the anomaly, which expended 29 kg of propellant reducing the program's propellant margin to zero.

The vast majority of amateur-built rocket motors utilize a composite propellant, most commonly APCP and candy rocket propellant.

This imparts additional energy to the propellant, so that one can extract more work out of each kilogram of propellant, at the expense of increased power consumption and (usually) higher cost.