Abstract
Inevitable errors in X-probe measurement are investigated in simulated Gaussian velocity fields generated on a digital computer. Two types of X arrangements are studied : one is a conventional X-probe comprised of two slant hot wires, and the other is that which consists of slant and normal hot wires (modified X-probe). The numerical simulation results indcate that the most significant factor producing measurement errors is the difference in an instantaneous velocity field between two wires. Especially, the measurement accuracy of the modified X-probe depends strongly on the effect of wire separation, and at worst, data obtained with such a probe result in fallacious information. To confirm the error analysis, turbulent quantities in a pipe flow have been measured using these X-probes. Experiment clearly shows the same results as those of error analysis.
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