DID YOU KNOW? DTIC has over 3.5 million final reports on DoD funded research, development, test, and evaluation activities available to our registered users. Click HERE
to register or log in.
THE QUESTION OF MEASURING AVERAGE VELOCITY RATE IN PIPES BY MEANS OF POINT-TYPE SENSORS,
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO
Pagination or Media Count:
Assuming that the rates of flow are symmetrically distributed with respect to the pipe axis, the location of a layer is found in which the flow rate is equal to the average flow rate of the fluid in the pipe the variation of this location with the varying average rate is investigated. Experimental curves of rate versus radius are shown. These curves are described by an exponential equation. Examination of this equation shows that the measurement of the average rate by a point-type sensor placed in the average-rate layer is much more accurate than the measurement of the maximum rate with subsequent rate correction. The theoretical error of measurement when the point sensor is displaced from its true average-layer position by 1 percent is 0.15 percent. However, the practical value of this error will be somewhat higher. Author
APPROVED FOR PUBLIC RELEASE