Accession Number : AD0681642

Title :   PHOTOELECTRIC METHOD OF MEASURING THE TURBULENCE OF HIGH-TEMPERATURE FLOW,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Trokhan,A. M. ; Kuznetsov,I. L. ; Baranova,G. R. ; Ignatenko,Yu. V.

Report Date : 19 JUN 1968

Pagination or Media Count : 13

Abstract : A recording method is described which permits determining the amplitude spectrum of the velocity fluctuations of a turbulent flow and to find the mean flow velocity. The investigated section of the flow with tracking particles is projected by means of an optical system onto a flat screen with two parallel slits. In the case of a low-temperature flow this section is illuminated by an intense external source, whereas at a sufficiently high temperature the self-luminescence of the particles can be used. When the image of the luminous particle strikes the slit, a voltage pulse arises at the output of a photomultiplier which is then amplified and discriminated. When the image of the luminous particle strikes the second slit a bright flash appears on the screen of the oscillograph. Since the velocity of various particles in a turbulent flow is dissimilar, the bright flashes arise at various distances from the place of triggering, grouping about a point corresponding to the most powerful transit time of the particles between the slits. (Author)

Descriptors :   (*TURBULENCE, MEASUREMENT), PHOTOMULTIPLIER TUBES, VELOCITY, PERIODIC VARIATIONS, OPTICAL TRACKING, ILLUMINATION, PULSES, TRIGGER CIRCUITS, OSCILLOSCOPES, PHOTOGRAPHY, PROBABILITY DENSITY FUNCTIONS, HIGH TEMPERATURE, USSR

Subject Categories : Fluid Mechanics
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE