Abstract
A new simple method has been developed to measure the concentration and velocity simultaneously for the gas mixture (CO 2–air) flow by two hot-wire probes. By using a calibration map, the values of the instantaneous concentration and velocity can be determined from the voltages of two hot-wire probes with different overheat ratios (OHR) by digital data processing. This method does not require subtle adjustment of the OHR to achieve insensitivity to the CO 2 concentration, as in the past work by Chassaing (Mélange turbulent de gaz inertes dans un jet tube libre, Thèse Doc. Sciences 42, Inst. Nat. Poly. de Toulouse, 1979). The measurements have been performed in a CO 2 jet in grid turbulence. The experimental results for the centerline and radial distributions of the mean and r.m.s. values of mass fraction concentration and velocity, and axial scalar flux are consistent with previous data.
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