三線式熱線による乱流測定の数値実験

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  • Numerical Experiment of the Turbulence Measurement by Triple-Sensor Hot-Wire Probes.
  • 3センシキ ネッセン ニ ヨル ランリュウ ソクテイ ノ スウチ ジッケン

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The general hot-wire response equations of the triple-sensor hot-wire probes were introduced. Assuming normal distributions for the turbulence velocities, numerical experiments were carried out on the measurements of the circular free jet and the weak isotropic turbulent flow. The results are summarized as follows : the measured mean velocity and Reynolds stresses are exact when the turbulence intensity is weak, as far as the values of the yaw and pitch factors are known ; the magnitudes of the relative errors of (u2)^^- and (uv)^^- by the triple-sensor probes are nearly equal to those by the X-wire probe when the turbulence intensity is strong ; and the maximum value of the effective cooling velocity of a turbulent flow in which the turbulence velocity always stays inside the acceptable domain is approximately 1.4 times the value of the mean velocity.

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