在石化能源的消耗中，交通運輸是能源消耗重要的一環，而中大型卡車運輸則是交通運輸中不可或缺的部分，然而中大型卡車因外型上的限制，導致在行駛時會產生極大的空氣阻力，2009年蔡明育[28]對於減少卡車阻力的噴嘴式卡車減阻研究裝置進行了一系列風洞測試，了解噴嘴式卡車減阻裝置在1/8的GCM卡車縮尺模型上的運作效能。該研究證實了噴嘴式卡車減阻裝置在卡車面對正向風場時能達到一定程度的減阻效果，導流角45~60度面積比1.4~2的減阻裝置有較好的減阻效果，而本研究則為該研究的延伸，探討在側風條件下，噴嘴式減阻裝置的運作情形。
　　本研究採用同蔡明育實驗的模型，針對車體在受到0~14度來向風場時，車體軸向、側向，以及偏航矩等的力場變化情形進行量測。結果發現該裝置在側風風場條件下，不僅能減少卡車軸向受力，對於卡車側向受力和偏航矩都有改善的效果，其在軸向阻力的部分，低側風角0°~10°時約能減少6~10%的減阻效果，在較高側風角12°~14°時還能維持約3%的減阻效果，而在側向受力的部分，則可達到5~7%左右的減力效果，偏航矩的部分在8°以下側風角時約有50~80%的改善效果，而在10°以上時仍維持有20~45%改善效果。因此該減阻裝置不僅能使卡車能源使用上能更有效率，更能提高卡車行駛時的安全性。

Transportation is an important part of the global energy consumption, and truck is one big group of the transportation. The shape of truck will induce big drag, so how to reduce the drag being a big issue of energy economized research. Tsai [28] performed a research of corner nozzle flow effect on the truck drag reduction. A 1/8 scaled GCM truck model was used. It was found that the corner nozzle flow has significant effect on truck drag reduction. In 0° yawing angle test, the nozzle with guide angle 45° and 60° and outlet to inlet area ratio around 1.4~2 showed better drag reduction effect. The present study is an extension to the research of Tsai to further understand the aerodynamic effects of corner nozzle flow when the truck is in crosswind flow situation.
The same truck model was used to study experimentally the drag, side force, and yawing moment at crosswind angles 0°~14°. The nozzle effectiveness on the drag for low crosswind angle (0°~10°) was around 6%~10%, and at crosswind angles 12°~14° the drag reduction was around 3%. The side force decreased by about 5~7%. And the yawing moment was reduced by about 50~80% at crosswind angles 0°~8°, and a reduction of about 20~45% at crosswind angles 10°~14°. Overall the results showed that the corner nozzle not only can reduce the drag effectively, but also can decrease the side force and yawing moment significantly for safer driving.

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