超声速民机声爆理论、预测和最小化方法概述

Overview of sonic boom theory, prediction and minimization methods for supersonic civil aircraft

  • 摘要: 超声速民机的低声爆设计涉及到多个相互制约的因素,要实现较理想的声爆水平设计难度相当大,发展准确快速有效的设计方法是非常必要的。在超声速民机概念设计阶段,关于声爆计算的理论方法寥寥可数,标准声爆理论和声爆最小化方法不仅有重要的理论意义,在概念设计中也很有实用价值,因此,我们需要对其有全面深入的认识。文中主要对这两个理论方法及应用进行评述和展望。标准声爆理论以F函数为核心建立了飞机横截面积与声压及声爆之间的关系。声爆最小化方法给出了设计合适的F函数以达到尽可能小的声爆的思路。声爆最小化方法的应用效果受制于初始构型,当应用声爆最小化方法不能达到设计目标时,可能不得不尝试修改初始构型。考虑到该方法的局限性,减小声爆还需要开拓新思路。

     

    Abstract: It is very difficult to achieve sonic boom with an enough low level because there are several design goals with inherent contradictions. Consequently, it is necessary to develop rapid and efficient design methods. There are very few theory or methods about the prediction of sonic boom in the concept design of supersonic civil aircraft, while the standard sonic boom theory and sonic boom minimization methods are the fundamentals and very valuable in applications, especially in the concept design. The review on those theories and outlooking are given in this paper for us to get full knowledge and deep discern about them. The F function of the standard sonic boom theory build the bridge for the acoustic pressure or sonic boom and the cross-section area of the aircraft. The sonic boom minimization methods provide a roadmap to approach the minimum boom by the design of the F function. Note the capacities of applications of the sonic boom minimization methods are constrained by the initial configuration. As the goal of sonic boom level cannot be met via the sonic boom minimization methods, the major modifications of the initial configuration have to be made in the design. Other innovative methods of boom reduction need to be developed except sonic boom minimization method.

     

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