An improved data reduction method in the measurement of velocity vector by a 5-hole yaw-meter with a Kiel tube

キールチューブ付5孔ヨーメータによって、速度ベクトルを求める場合の基本式を提案した。本基本式は従来の方法に比べて、校正係数が少なく、繰返し法によって解く場合の初期値の与え方を改善して、計算ステップ数を少なくし、圧力計測から風向、風速を求めるまでの計算処理時間を短縮した。本方法による風向、風速の測定精度は従来の方法と同程度であることが実験的に示された。
An attempt was made to improve the data reduction process of a 5-hole yaw-meter with a Kiel tube. A new system of equations to replace the old one is proposed, which is used to derive the magnitude and directions of the local flow velocity vectors. This system is simpler compared with the old one because fewer terms are used. As a result, the time to solve the system of equations by an iteration method is reduced. Also, the way of giving the initial values to start the iteration is improved. The measurement accuracy of the velocity and velocity angles by the present method is the same as by the old method.
資料番号: AA0004162000
レポート番号: NAL TM-678