CAJ | 학술논문

壁面粗糙度对湍流的影响研究是流体动力学的热点问题。利用边界层积分法对零压力梯度下棱锥形粗糙壁面湍流边界层的发展进行预测分析。首先，以2个几何统计参数对棱锥形的粗糙形态进行描述，通过对试验数据的拟合分析，确定粗糙度函数的具体形式；然后，利用动量积分方程和壁面律求解出粗糙壁面湍流边界层厚度和局部摩擦系数沿流向的变化情况。计算结果与试验数据吻合较好，表明采用积分法预测粗糙壁面湍流边界层的发展精度较高，适于工程应用。
벽면조조도대단류적영향연구시류체동역학적열점문제。이용변계층적분법대령압력제도하릉추형조조벽면단류변계층적발전진행예측분석。수선，이2개궤하통계삼수대릉추형적조조형태진행묘술，통과대시험수거적의합분석，학정조조도함수적구체형식；연후，이용동량적분방정화벽면률구해출조조벽면단류변계층후도화국부마찰계수연류향적변화정황。계산결과여시험수거문합교호，표명채용적분법예측조조벽면단류변계층적발전정도교고，괄우공정응용。
The effect of wall roughness on the turbulent flow has long been an important research topic in the field of fluid dynamics. The development of turbulent boundary layers on rough walls with pyramid roughness elements in zero pressure gradient is conducted in this paper, using the integration method of boundary layers. Firstly, the pyramid roughness texture is characterized with two geometric statistical pa-rameters, and the specific form of the roughness function is next determined by fitting the experimental da-ta. Then, the streamwise development of the boundary layer thickness and local friction factor are solved based on the momentum integral equation and the wall law. The calculation is observed to be in reasonable agreement with the experimental data, which validates the accuracy and simplicity of the integration meth-od in predicting the development of turbulent boundary layers on rough walls.