S.1 Spacecraft Propulsion Systems Chapter 1: Introduction to ...
S.1 Spacecraft Propulsion Systems Chapter 1: Introduction to ...
S.1 Spacecraft Propulsion Systems Chapter 1: Introduction to ...
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Main Performance of Bipropellant <strong>Systems</strong><br />
Thrust level: 4 ÷ 500N for satellites, up <strong>to</strong> 45 000 N for general spacecraft application<br />
Impulse bit: ≥ 10 -2 Ns (with thruster minimum on-time of 20 ms)<br />
Thruster-spec. Impulse: ≤ 2850 Ns/kg for F ≤ 25N (for steady state operation)<br />
≤ 3110 Ns/kg for F ≤ 400N<br />
Thruster-spec. Impulse: ≥ 1000 Ns/kg (for pulse mode operation)<br />
System-spec. Impulse: ≤ 2800 Ns/kg<br />
Advantages<br />
Higher Thruster-spec. Impulse, Isp (≤ 3110 Ns/kg)<br />
Higher System-spec. Impulse Issp (≤ 2800 Ns/kg) resulting in low system mass<br />
High thrust capability, up <strong>to</strong> 45 000 N<br />
Disadvantages<br />
Bipropellant system complexity with added valves, regula<strong>to</strong>rs, etc.<br />
Higher cost in comparison <strong>to</strong> monopropellant hydrazine systems.