以自調三角形網格法探討振動葉片流場

Numerical Investigation of Oscillating Cascade Flows Using an Adaptive Triangular Mesh

楊世英(Shi-Ying Yang)

《中國航空太空學會學刊》 30卷1期 (1998/03) Pp. 87-98

https://doi.org/10.6124/TAASRC.199803_30(1).10

摘要

本文採用一個自調三角形網格法和一個區域隱式有限體積法來探討穿音速振動葉片流場，在卡式座標系統下，求解具動態效應之非穩態歐拉方程式。依據升力係數隨時間變化分佈固和首階動態壓力差係數大小分佈圈，本文所採用的數值法可以有效率地獲致流場週期特性並得到滿意的計算結果。由於振動非穩態住所產生的漩渦釋放現象可由瞬間等漩渦度圍觀察得知，而瞬間自調網格則可清晰地抓住非穩態壓力波、震波和漩渦釋放現象。

關鍵字

自調三角形網格 ； 振動葉片 ； 區域隱式

並列摘要

An adaptive triangular mesh and a locally implicit finite volume scheme are utilized to investigate the transonic oscillating cascade flows. In the Cartesian coordinate system, the unsteady Euler equations with moving domain effects are solved. Based on the time history of lift coefficient and the magnitude distribution of the first harmonic dynamic pressure difference coefficient, the present approach can efficiently achieve the periodical characteristics and give satisfactory results. From the instantaneous vorticity contours, the vortex-shedding phenomenon due to oscillating unsteadiness is observed. The instantaneous adaptive meshes clearly capture the unsteady pressure wave, shock and vortex-shedding behaviors.

並列關鍵字

adaptive triangular mesh ； oscillating cascade ； locally implicit