新着論文

本研究室で研究開発している直交格子積み上げ法（BCM）を超音速内部流れ場へ適用しました．バックステップモデルとキャビティ保炎器モデルを用いた超音速流れ条件での検証解析より，BCMの有用性を明らかにしました．さらに，キャビティ保炎器内部の滞留時間や抵抗係数などから，スクラムジェット燃焼器の拡大部におけるキャビティ保炎器内部流れ場への影響について明らかにしました．詳細については，下記の学術論文をご覧ください．

論文タイトル：Numerical investigation of flow dynamics and aerodynamic characteristics of cavity flameholders in divergent sections of scramjet combustors using building-cube method

著者：Shinichiro Ogawa, Kentaro Miyata, Daisuke Sasaki

掲載論文：CEAS Space Journal (2025)

DOI: https://doi.org/10.1007/s12567-025-00644-5

Abstract:

A two-dimensional Building Cube Method (BCM) solver was developed and validated to enable high-precision analysis of supersonic internal flows in scramjet combustors featuring cavity flameholders. By incorporating an immersed boundary method and a third-order monotonic upstream-centered scheme for conservation laws (MUSCL) scheme, the solver successfully reproduced benchmark results for backward-facing step and cavity configurations, showing excellent agreement with experimental and numerical data in terms of pressure distribution, vortex structure, residence time, and drag characteristics. To clarify the effect of divergent section placement, four representative cavity configurations were analyzed numerically. When the cavity was positioned at or upstream of the divergent section, the residence time increased by up to threefold and the pressure-drag coefficient decreased by up to 54%, attributed to shear layer development suppressing the mass exchange with the main flow. These results provide new insights into cavity-induced flow dynamics and offer practical design guidelines for improving the combustion stability and reducing aerodynamic losses in scramjet engines.