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Two-Dimensional Supersonic Nozzle Thrust Vectoring Using Staggered Ramps.

机译：使用交错坡道的二维超音速喷嘴推力矢量。

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摘要

A novel mechanism for vectoring the thrust of a supersonic, air-breathing engine was analyzed numerically using ANSYS Fluent. The mechanism uses two asymmetrically staggered ramps; one placed at the throat, the other positioned at the exit lip of the nozzle. The nozzle was designed using published flow data, isentropic relationships, and piecewise quartic splines. The design was verified numerically and was in fair agreement with the analytical data. Using the steady-state pressure-based solver, along with the realizable kappa - epsilon turbulence model, a total of eighteen simulations were conducted: three ramp lengths at three angles, using two sets of inlet boundary conditions (non-afterburning and afterburning). The vectoring simulations showed that the afterburning flow yields a lower flow deflection distribution, shown by the calculated average deflection angle and area-weighted integrals of the distributions. The data implies that an aircraft can achieve an average thrust vectoring angle of approximately 30° in a given direction with the longest ramp length and largest ramp angle configuration. With increasing ramp angle, the static pressure across the nozzle inlet increased, causing concern for potential negative effects on the engine's turbine. The mechanism, for which a provisional patent application has been filed, will require further work to investigate the maximum possible thrust vectoring angle, including experiments.
机译：使用ANSYS Fluent数值分析了一种新型矢量，用于对超音速，空气呼吸发动机的推力进行矢量化处理。该机制使用两个不对称交错的斜坡。一个位于喉部，另一个位于喷嘴的出口唇部。使用已发布的流量数据，等熵关系和分段四次样条来设计喷嘴。该设计经过了数值验证，并与分析数据完全吻合。使用基于稳态压力的求解器以及可实现的kappa-epsilon湍流模型，总共进行了18次仿真：使用两组入口边界条件（非加力燃烧和加力燃烧）以三个角度对三个斜坡长度进行仿真。矢量模拟表明，加力流产生的流量挠度分布较低，这由计算出的平均挠度角和面积加权积分表示。该数据表明，飞机可以在给定方向上以最长的坡道长度和最大的坡道角度配置实现大约30°的平均推力矢量角度。随着倾斜角的增加，喷嘴入口的静压力增加，从而引起对发动机涡轮机潜在负面影响的担忧。已经提交了临时专利申请的该机构将需要进一步的工作来研究最大可能的推力矢量角，包括实验。

著录项

  • 作者

    Montes, Carlos Fernando.;

  • 作者单位

    University of California, Davis.;

  • 授予单位 University of California, Davis.;
  • 学科 Aerospace engineering.;Engineering.
  • 学位 M.S.
  • 年度 2016
  • 页码 82 p.
  • 总页数 82
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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