這篇論文著重在非設計工況下運行的超音速飛行器的物理特性的研究。通過計算流體力學（CFD）模擬，對飛行器在不同非設計工況下的氣動行為和性能進行分析，其研究結果有助於優化非設計工況下的性能和安全性，為超音速飛行器的設計方法和操作考慮提供信息。

The present thesis investigates the off design conditions of a hypersonic vehicle at low speed, with a specific focus on aerodynamic forces. The aim is to enhance the understanding of the force’s behavior and associated factors, enabling the optimization of vehicle design and performance in diverse operational scenarios.
The research methodology includes a combination of computational fluid dynamics (CFD) simulations, wind tunnel testing, and analytical modeling. Firstly, a comprehensive literature review is conducted to gather existing knowledge and identify gaps in understanding the off-design forces characteristics of hypersonic vehicles at low speeds.
The CFD simulations are performed using state-of-the-art software to accurately capture the complex aerodynamic phenomena that are contributing. The simulations provide insights into the flow behavior, shock-wave interactions, and boundary layer characteristics, which are crucial factors influencing the performance.
The wind tunnel experiments are conducted to validate the CFD results and provide experimental data for comparison. Model scale testing is performed to quantify the drag forces under different off-design conditions. The experimental results are then used to validate and improve the accuracy of the CFD models.
Furthermore, an analytical drag model is developed based on the obtained results and insights from the CFD simulations and wind tunnel experiments. The model aims to provide a simplified yet accurate representation of drag behavior under various off-design conditions.
The findings from this research will contribute to a better understanding of the off-design conditions characteristics of hypersonic vehicles at low speeds, enabling engineers and designers to improve vehicle performance in a wide range of operating conditions. The results can be utilized to optimize vehicle configurations, including the shape, control surfaces, and boundary layer control systems, ultimately enhancing the overall efficiency and maneuverability of hypersonic vehicles.

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