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Phoebus was a series of nuclear reactors, designed and built in the 1960s as part of the Rover program, to meet the needs of an interplanetary mission (see nuclear propulsion), in particular a manned mission to Mars.
No particular effort had been made to maximize the specific impulse, that not being the reactor's purpose, but Pewee achieved a vacuum specific impulse of 901 seconds (8.84 km/s), well above the target for NERVA.
PHOEBUS was designed to produce higher power levels and longer duration operations than the KIWI reactors. PHOEBUS was being paralleled by alternate core concepts at the Argonne National Laboratory.
2 Flow Rate-Phoebus 2A (120 kg/s) Highest Specific Impulse-Pewee (838 seconds) Minimum Specific Mass-Phoebus 2A (2.3 kg/MW) Smallest-Nuclear Furnace (44 MW) Hottest-Pewee (2,550 °K exit gas, 2,750 °K fuel)
This calculator determines the sea-level specific impulse (Isp_sl) of a rocket engine given its vacuum specific impulse (Isp_vac), combustion chamber pressure (Pc), and atmospheric pressure (Pa).
Please guide me how to calculate Vacuum Isp, specifically what parameters I should enter. If expansion ratio is 40, can I simply calculate considering chamber pressure and ambient pressure ratio as 40?
Isp-sec: The specific impulse of the motor in vacuum. The higher the number, the more efficient the motor. The units here are seconds - because specific impulse represents the kilograms-thrust the motor generates per ...
Their specific impulse is up to three times greater than chemical rockets, they produce comparable amounts of thrust and they could be designed to accept a variety of propellants, from CO2 to ammonia.
Specific impulse (usually abbreviated as Isp) is a measure of how efficiently an engine, such as a rocket or jet engine generates thrust. It is either measured in units of velocity (metres per second, or feet per seco...
This analysis suggests that thrusters using vacuum arc sources can be operated efficiently with a range of propellant options that gives great flexibility in specific impulse.
