a positive displacement pump will do as you say. An impeller based pump changes efficiency under restriction and the load is reduced. A perfect example is a vacuum cleaner. Running with a clean filter/bag, and an open clean hose, the sound it makes is a medium deep whine. If you cap off the intake (or exhaust) the sound increases in pitch (because they are universal motors (brushes not synchronous) the motor speeds up because the load goes down. The fins on the turbine just spin the same air over and over with much less work being done. It seems wrong, but isn't. Jim
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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