PHOTOELECTRIC METHOD OF MEASURING THE TURBULENCE OF HIGH-TEMPERATURE FLOW,
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 19, 1968
- Accession Number
- AD0681642
Entities
People
- A. M. Trokhan
- G. R. Baranova
- I. L. Kuznetsov
- Yu. V. Ignatenko
Organizations
- National Air and Space Intelligence Center