Ejector Pump Cavitation

[ramblin]

I'm using an ejector pump driven by high pressure fuel boosting a low pressure (~ 2 psia) source of fuel by 10-15 psi. It is advantageous for my system to use a high temperature (~250 F) primary flow. My concern is that this high temperature translates to a high vapor pressure and increased potential for cavitation. The secondary flow is relatively cold, say ~ 50 F.

The handbook I have for ejector pump design quotes cavitation requirements as a function of vapor pressure but doesn't consider the case of primary and secondary flows at different temperatures.

Any references, papers, or suggestions on this topic?

 

[rbcoulter]

Is the fuel at 250 F within the vapor pressure requirement of the design book?

 

[ramblin]

If I base the vapor pressure on the primary flow temp ie 250 I get a much higher required secondary pressure than if I base it on the secondary temperature. Somehow it makes sense to me that the true requirement would depend on both temp's. I don't really have the luxury of being conservative ie. base it on the highest temp so I'd like to know where the real reqmt is....