Simultaneous velocity measurement by a couple of L2F system for spatial correlation of turbulence

H. Ueki, M. Ishida, D. Sakaguchi

Research output: Chapter in Book/Report/Conference proceedingChapter


In order to establish a optical measuring method of spatial turbulence scale, a new laser 2-focus velocimeter (L2F) system with the high optical SN ratio was developed. It consists of a couple of L2F system in which wide-stripe type high power semiconductor laser was installed. Flow velocities were measured simultaneously at two adjacent points in a circular air jet, and all these velocity data and their corresponding data sampling time were acquired in time sequence by a personal computer. The correlation-based slotting technique was applied for analyzing the spatial correlation of turbulence. Estimated spatial- and temporal- turbulence correlations were compared to those measured by the hot wire anemometer. It is clearly shown that a couple of L2F system in conbination with the correlation-based slotting technique is very useful for turbulence correlation measurement.

Original languageEnglish
Title of host publicationProceedings of the 1999 3rd ASME/JSME Joint Fluids Engineering Conference, FEDSM'99, San Francisco, California, USA, 18-23 July 1999 (CD-ROM)
PublisherAmerican Society of Mechanical Engineers
Number of pages1
ISBN (Print)0791819612
Publication statusPublished - 1999
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Earth and Planetary Sciences
  • General Engineering
  • General Environmental Science


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