X形熱線プローブを用いたフライングホットワイヤ法による速度の3方向成分の同時計測 : 第1報, 速度の算出法と誤差の見積もり

抄録

An original flying hot-wire (FHW) method was developed to measure an extremely low-velocity region in a recirculating flow. This method moves the hot-wire probe in the spanwise Z-direction. The method can measure three components of the mean velocity and six components of the Reynolds stress using an X-array hot-wire probe. The probe moves at a constant velocity, and detects the velocity W in addition to a biasing velocity W_b. The sensitivity of the yaw and pitch angles is important to maximize the accuracy of the velocity data. This paper proposes a newly developed velocity reduction method for the FHW system using an X-array hot-wire probe. The accuracy of the velocity data is estimated by numerical simulation and experiments. The estimated error in the mean velocities is less than 3.5%, if the probe is fabricated and installed in the tunnel with care.