Aerospike: Mission Simulation and Optimal Design Using Openfoam and Dakota

Roberto Carbone, Joel Enrique Guerrero Rivas, Eric Segalerba, Jan Oscar Pralits
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Abstract

Hypersonic flight presents several difficulties linked to the important viscous dissipation of kinetic energy on the surface of a vehicle which causes the need for relevant Thermal Protection Systems, reduces communication efficiency due to air ionization and creates an important pressure load due to the stagnation point on the fuselage. Those effects are enlarged by the presence of a shock wave with its strength growing in the case of a blunt body-shaped vehicle. The aim of this work is to study the effectiveness of the static device called “Aerospike” to reduce the effects induced by the hypersonic flight of a blunt body, in particular with respect to the average surface temperature, the pressure load and drag coefficient. After having studied a base case, an optimization process to define an optimal shape both for the aerospike and the aerodisk are presented.
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Aerospike:使用 Openfoam 和 Dakota 进行飞行任务模拟和优化设计
高超音速飞行会带来一些困难,其中包括飞行器表面动能的大量粘性耗散,因此需要相关的热保护系统,空气电离会降低通信效率,机身上的停滞点会产生巨大的压力负荷。这些影响会因冲击波的存在而扩大,在钝体飞行器的情况下,冲击波的强度会增加。这项工作的目的是研究名为 "Aerospike "的静态装置在减少钝体高超音速飞行引起的影响方面的有效性,特别是在平均表面温度、压力负荷和阻力系数方面。在研究了基本情况后,介绍了确定气钉和气盘最佳形状的优化过程。
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