Analytical model of turbine-type flowmeter guides in the selection of valid extrapolation of available calibration data. An expression for flowmeter performance is developed to include the effects of fluid friction, bearing drag, and magnetic drag upon helical rotor design

Smith, R. L.

English

NASA Technical Reports Server

June 1967	 Brief 67-10179 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
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A Theoretical Model for Determining Turbine Flowmeter Sensitivity 
A lack of facilities for the calibration of turbine- Notes: 
type flowmeters at their application use—flowrates and 1.	 No empirical data have been generated in con-
in their application use—fluid necessitates the use of firmation of the theory presented. 
an extrapolation of available calibration data to use 2.	 Inquiries concerning this innovation may be di-
conditions in the absence of in-place calibration. For rected to: 
such an extrapolation to have any validity, an analyti- Technology Utilization Officer 
cal model of the subject flowmeter must exist to guide Marshall Space Flight Center 
in the selection of the extrapolation form. Huntsville, Alabama 35812 
Analysis is, therefore, performed to develop an Reference: B67-10179 
expression for flowmeter performance that includes the 
effects of fluid friction, bearing drag, and magnetic Patent status: 
drag upon helical rotor design. A direct solution is No patent action is contemplated by NASA. 
developed to describe fluid friction effects. Magnetic Source: R. L. Smith 
and bearing drag effects do not lend themselves to of North American Aviation, Inc. 
direct solution. However, expressions are derived for under contract to 
the form of the drag torques; for example, bearing Marshall Space Flight Center 
drag torque is found to be quadratic in stream velocity. (M-FS-1 172)
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Aeronautics and Space Administration. Neither the United States 	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States
	 will be free from privately owned rights. 
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A theoretical model for determining turbine flowmeter sensitivity

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