ASIX-ORIENTATION single hot-wire technique is described and applied to the complex flowfield of a swirling confined jet. The flowfield, which contains a sudden expansion with recirculation zones, is typical of those found in gas turbine and ramjet combustors. The present study focuses on nonreacting flows and gives details of how the method allows time-mean velocities and turbulent normal and , shear stresses to be deduced. Flowfield surveys are presented for both nonswirling and swirling axisymmetric confined jets in the full paper, with only the key results presented here. Contents As part of a research program program aimed at the understanding and modeling of mixing processes in combustion . chambers, a six-orientatio n single normal hot-wire technique is being used in an axisymmetric geometry under low-speed, nonreacting, swirling flow conditions. The flow enters the test section and proceeds into a large chamber (the expansion ratio Did is 2) via a sudden expansion with a sidewall angle a. of 90 deg. The large chamber is 30 cm in diameter and 150 cm long and constructed of plexiglass so as to aid flow visualization studies. The airflow exits directly .into the laboratory; there are no film cooling or dilution air holes. Inlet swirl vanes (whose downstream face is located 3.2 cm upstream of the expansion station) are adjustable to a variety of swirl vane angles with = 0 (swirler removed) and 38 deg being emphasized in the present study.
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Janjua et al. (1983) studied this question.