Synopsis
Excerpt from Vortex Shedding Flow Meter Performance at High Flow Velocities
Fuel and liquid oxygen (lox) flows in rocket engine ducts have been measured in the past using venturi flowmeters and more recently on the space shuttle main engine (ssme) by turbine meters. The ducts are kept as short as possible with the result that few straight sections of any length are available to install meters. Both turbine meter and venturi meter installations require extensive modification of the duct if added later. The turbine meter also has the disadvantage of introducing moving parts into the duct. The vortex shedding flowmeter was examined in this work as an alternative to these meters for ssme duct measurements.
Conventional flowmeter installations call for 10 to 20 diameters of straight pipe preceding a flowmeter of any kind and 2 to M diameters of straight pipe after it If flow conditioning is introduced upstream of the meter, 6 to 10 diameters of straight pipe between the conditioner and the flow meter are still recommended. On the ssme, a straight duct section exceeding 10 diameters is a luxury. Few if any of the ducts will permit a flowmeter installation following recommended practice.
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