Question

Estimate the mass and volume of nitrogen gas required to pressurize an N O − MMH feed 24 system for a 4500 N thrust chamber of 25 sec duration (?? = 0.92, the ideal Is = 285 sec at 1000 psi or 6894 N/m2 and expansion to 1 atm).

The chamber pressure is 20 atm (absolute) and the mixture ratio is 1.65.

The propellant tank pressure is 30 atm, and the initial gas tank pressure is 150 atm.

Allow for 3% excess propellant and 50% excess gas to allow some nitrogen to dissolve in the propellant.

The nitrogen regulator requires that the gas tank pressure does not fall below 29 atm.

(use a temperature of 20 degrees C)

Answer 1