無人水下載台斜航試驗流體動力係數之自由表面效應

本研究採後插式固定機構進行FRU-1無人水下載台流體動力係數量測分析，以了解無人水下載台於近水面垂向斜航時的流體動力係數受自由水面影響之效應。FRU-1無人水下載台於近水面潛航狀態下進行垂向斜航試驗、艏翼角、X舵角作用下量測垂向力以及計算縱搖力矩，分析無人水下載台流體動力係數，探討其受自由水面的影響。試驗狀態條件主要包含兩個近水面潛航深度、俯仰角度、艏翼角度及X舵角度等四項參數變化的組合，拖曳速度為2.0m/s。量測分析結果顯示FRU-1無人水下載台在斜航試驗時深沒條件的垂向力流體動力係數大於淺沒條件的垂向力流體動力係數；艏翼力在水下載台0度、-6度及+6度時其淺沒條件的垂向力流體動力係數大於深沒條件的垂向力流體動力係數；X舵在水下載台0度、-6度，其淺沒的垂向力流體動力係數均大於深沒的垂向力流體動力係數，在水下載台+6度時則相反；FRU-1無人水下載台之斜航垂向流體動力係數與U-1無人水下載台之升力係數量測結果趨勢相似。

關鍵字

無人水下無人載台；斜航試驗；流體動力係數；自由水面效應

並列摘要

In this study, the rear sting support was used to fix and adjust the oblique angle of the FRU-1 underwater vehicle model. The tests were conducted near the free surface to study the free surface effect on the hydrodynamic coefficients of the FRU-1 underwater vehicle model. The conducted tests included the oblique tests of FRU-1 underwater vehicle model with zero angle of attack of the bow foil and X rudder, the bow foil with different angles of attack and the X rudder with different lifting and yawing angles of attack. The tests were conducted at two submerged depths and the towing speed was 2 m/s. The test results show that the hydrodynamic coefficients of the oblique tests of deep submerge are grataer than that of the shallow submerge, the hydrodynamic coefficients of the bow foil of shallow surmerge are greater than that of deep surmerge, and the hydrodynamic coefficients of the X rudder of shallow submerge are greater than that of the deep submerge except the underwater vehicle at +6 degree. The lifting coefficients of the oblique test of the FRU-1 underwater vehicle are about the same trend with the U-1 underwater vehicle which was conducted with two struct supports and different towing speed.