Aeroacoustic and Aerodynamic Adjoint-Based Shape Optimization of an Axisymmetric Aero-Engine Intake

IF 0.1 4区 工程技术 Q4 ENGINEERING, AEROSPACE Aerospace America Pub Date : 2023-08-22 DOI:10.3390/aerospace10090743
Morteza Monfaredi, V. Asouti, X. Trompoukis, K. Tsiakas, K. Giannakoglou
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Abstract

A continuous adjoint-based aeroacoustic optimization, based on a hybrid model including the Ffowcs Williams–Hawkings (FW–H) acoustic analogy, to account for the multidisciplinary design of aero-engine intakes with an axisymmetric geometry, is presented. To optimize such an intake, the generatrix of its lips is parameterized using B-Splines, and the energy contained in the sound pressure spectrum, at the blade passing frequency at receivers located axisymmetrically around the axis of the engine, is minimized. The engine is not included in the optimization and manifests its presence through an independently computed time-series of static pressure over the annular boundary of the simulation domain that corresponds to the inlet to the fan. Taking advantage of the case axisymmetry, the steady 3D RANS equations are solved in the rotating frame of reference and post-processed to compute the flow quantities’ time-series required by the FW–H analogy. The numerical solution of the unsteady flow equations and the otherwise excessive overall cost of the optimization are, thus, avoided. The objective function gradient is computed using the continuous adjoint method, coupled with the analytical differentiation of the FW–H analogy. The adjoint equations are also solved in the rotating frame via steady solver.
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轴对称航空发动机进气道的气动声学与气动伴随优化
针对航空发动机轴对称进气道多学科设计问题,提出了一种基于Ffowcs williams - hawkins (FW-H)声学类比混合模型的连续伴随气动声学优化方法。为了优化这样的进气道,使用b样条参数化了其唇部的母线矩阵,并且最小化了位于发动机轴线周围轴对称的接收器处叶片通过频率处的声压谱中包含的能量。发动机不包括在优化中,而是通过模拟域的环形边界上对应于风扇入口的独立计算的静压时间序列来显示其存在。利用壳体轴对称特性,在旋转参照系中求解稳态三维RANS方程,并进行后处理,计算出FW-H类比所需的流量时间序列。因此,避免了非定常流动方程的数值求解和优化过程中过多的总成本。采用连续伴随法,结合FW-H类比的解析微分法计算目标函数梯度。用定常求解器求解了旋转机架的伴随方程。
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来源期刊
Aerospace America
Aerospace America 工程技术-工程:宇航
自引率
0.00%
发文量
9
审稿时长
4-8 weeks
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