Tom Baker Posted January 30, 2016 Report Share Posted January 30, 2016 The companies documentation and location in the fuel system seem to indicate that it is to keep the fuel FLOW indicator steady. This may be because of the way the fuel recirculation is set up on the CT. Link to comment Share on other sites More sharing options...
Tom Baker Posted January 30, 2016 Report Share Posted January 30, 2016 I look at it this way. It dampens and they call it a dampener and doesn't accumulate. I guess you can call it anything you want. Fred works for me. A rose by any other name is still a rose. Link to comment Share on other sites More sharing options...
Doug G. Posted January 30, 2016 Report Share Posted January 30, 2016 A rose by any other name is still a rose. It misquote only works up to a point. Tell your wife you are bringing home manure will probably elicit a different response than if you tell her you are bringing roses. ???? Link to comment Share on other sites More sharing options...
Aero-Nut Posted January 31, 2016 Author Report Share Posted January 31, 2016 Fuel pressure pulsation so it doesn't show up on the instrument panel on your gauge. Newer instrumentation don't usually need this. These were on older models. Should it not be on the side of the fuel pump that the fuel pressure sensor is located to smooth out the pulses? I am not an expert on fluid dynamics but..... Link to comment Share on other sites More sharing options...
Mike Koerner Posted January 31, 2016 Report Share Posted January 31, 2016 Here's a possible explanation of the upstream position: All pumps, need some minimum inlet pressure (suction head) to avoid cavitation. We have a gravity-fed fuel system to supply that pressure. However, gravity systems are sensitive to turbulence (g-loads). Any bumps that momentarily lighten the load on our butt will also reduce the pump inlet pressure... if not for this device which uses the gas pressure outside the bellows, acting on the tiny volume of fuel "accumulated" in the bellows, to maintain fuel pressure and flow at the pump inlet during these momentary interruptions (mind you, we are not talking about aerobatic flight or sustained negative g's). If you looked at a plot of the pump inlet pressure as a function time in turbulent conditions it would like like January's S&P 500. The dampener (also called a snubber) smooths the pressure out. This may be more of an issue for the flow meter than the pump. Mike Koerner Link to comment Share on other sites More sharing options...
FredG Posted January 31, 2016 Report Share Posted January 31, 2016 Fred thinks it should be called "Bob". Link to comment Share on other sites More sharing options...
Tom Baker Posted January 31, 2016 Report Share Posted January 31, 2016 Should it not be on the side of the fuel pump that the fuel pressure sensor is located to smooth out the pulses? I am not an expert on fluid dynamics but..... It is not there to smooth out fuel pressure, but to keep the fuel flow indication steady. My guess is that the fuel bypass introduces pulses from the pump back into the supply line at the gascolator, and the damper is there to keep those pulses from messing up the fuel flow. Link to comment Share on other sites More sharing options...
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