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We see inducers before the main kerosene turbopump in engines such as F1 and RD180. Given the property of kerosene having extremely low vapor pressure (~0.007 bar around room temperature), is this really necessary? rd180 turbopump F1 turbopump

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  • $\begingroup$ Can you label the inducer in your images? $\endgroup$ – ikrase Jun 12 '20 at 20:06
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    $\begingroup$ Something to check: at what temperature and pressure does kerosene encounter that inducer? $\endgroup$ – Erin Anne Jun 12 '20 at 20:38
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    $\begingroup$ And also say what an inducer is? $\endgroup$ – ikrase Jun 12 '20 at 21:34
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    $\begingroup$ That the vapor pressure of kerosene is very low is rather irrelevant. The fuel and oxidizer are injected into a rocket engine's combustion chamber, not into vacuum. Chamber pressures are typically well over 100 atmospheres, 263 atmospheres in the case of the RD180. $\endgroup$ – David Hammen Jun 12 '20 at 21:46
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    $\begingroup$ The vapor pressure is highly relevant since this is all about cavitation. The inducer serves to prevent cavitation in the main turbopump. Arguing that RP-1 doesn't need an inducer is equivalent to arguing that RP-1 will not cavitate in a turbopump. It may be harder to cavitate RP-1 than fluids with higher vapor pressures, but it is clearly not impossible. $\endgroup$ – Organic Marble Jun 13 '20 at 1:32

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