Near-field accompanying optimization method for far-field sonic boom suppression of supersonic aircraft

Abstract

The invention discloses a near-field accompanying optimization method for far-field sonic boom suppression of a supersonic aircraft, and the method comprises the steps: giving a parameterized initialnear-field waveform, obtaining near-field and far-field overvoltage signals, and carrying out the modal decomposition; extracting each decomposition mode and characteristic value distribution thereof,and reversely solving a near-field overvoltage signal; on the basis of CFD grid division, according to the reversely solved near-field overvoltage signals and a given line segment at the lower position of the fuselage, completing target function variation formed by near-field overvoltage and target overvoltage distribution, and constructing and solving an adjoint equation; and performing optimization design based on a sequential quadratic programming algorithm, and performing forward calculation check on a design result. According to the method, the defects of traditional near-field accompanying optimization can be overcome, meanwhile, the tedious operation of far-field-near-field-body variation of far-field signal design is avoided, and the efficiency of accompanying optimization can becontinuously and fully utilized.

Description

technical field [0001] The invention relates to the technical field of supersonic aircraft, in particular to a near-field adjoint optimization method for far-field sonic boom suppression of supersonic aircraft. Background technique [0002] With the development of aerodynamic design technology, new energy technology and future market demand, under the condition that civil aviation in various countries strictly restricts the problem of supersonic sonic boom, the civil aviation industry generally believes that the technical conditions and market opportunities for the development of small supersonic business jets are basically mature. At least in the next few years, the development and test flight of small supersonic business jets will be put on the agenda. In fact, airlines in the United States, Russia, France, Japan and other countries have launched a series of supersonic business jet designs with less than 50 seats , such as Gulfstream Boom, Aerion, Spike and other companies...

AI Technical Summary

Problems solved by technology

[0005] In the design of ground sonic boom signals, although the implementation of near-field variation is relatively simple, it is impossible to directly design the shape of ground sonic boom signals, which is not conducive to the effective suppression of comprehensive characteristics such as sonic boom signal rise time and overvoltage peak value

In the far-field signal design, the far-field-near-field-body variation is the key to carry out the adjoint optimization of the far-field sonic boom. Source retrieval, variational assembly and other tedious processes are extremely inconvenient for both aircraft design engineers and design technology R&D personnel

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