Experimental investigation of the turbulent axisymmetric jet

The results of a study of the turbulent axisymmetric jet are presented. Data taken with a laser Doppler anemometer using the burst-processor technique is reported. Based upon a simple model for the back flow of a jet in a finite environment, it is concluded that the major source of error was the flow facility itself and not primarily the measurement technique utilized. The jet data is used to gain further insight into the appropriate methods for correctly utilizing the burst-processor. Following a brief description of hardware design and construction, the major difficulties in the implementation of counter measurements are reviewed. The concept of software verification is then introduced. The probability distribution function of the particle path length through the measuring volume is derived and its impact on verification techniques are explored. Procedures are described to give a rough guide for judging signal quality and particle seeding characteristics. Finally, a methodology is suggested for the programming of data acquisition routines.