DNS of momentum and heat transfer over rough surfaces based on realistic combustion chamber deposit geometries

Forooghi Pourya; Weidenlener Alex; Magagnato Franco; Boehm Benjamin; Kubach Heiko; Koch Thomas; Frohnapfel Bettina

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DNS of momentum and heat transfer over rough surfaces based on realistic combustion chamber deposit geometries

机译：基于实际燃烧室沉积几何形状的粗糙表面上动量和热传递的DNS

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摘要

Direct Numerical Simulation (DNS) is carried out to investigate flow and heat transfer (passive scalar) over rough surfaces extracted from microscopy of combustion chamber deposits (CCD) in a direct injection test engine. The simulation set-up is a channel with one rough and one smooth wall. The roughness characteristic height, defined as maximum peak-to-valley height averaged over several subsets of the surface, in viscous units (k(+)) is varied from 11 to 46 in the simulations. Based on the simulation results, it is estimated that the equivalent sand roughness size of the CCD is approximately 300 gm, which is more than two times larger than the physical height of the roughness features. It is also demonstrated that the ratio of Stanton number to friction coefficient on a rough wall is smaller than that on a smooth wall at the same Reynolds number, and it decreases with an increase in k(+).

机译：进行了直接数值模拟（DNS），以研究在直接喷射试验发动机中从燃烧室沉积物（CCD）的显微镜中提取的粗糙表面上的流动和传热（被动标量）。模拟设置是一个具有一面粗糙壁和一面光滑壁的通道。在模拟中，粗糙度特征高度（定义为在表面的几个子集中平均的最大峰谷高度）以粘性单位（k（+））从11变为46。根据模拟结果，估计CCD的等效砂粗糙度大小约为300 gm，比粗糙度特征的物理高度大两倍以上。还证明了在相同雷诺数下，粗糙壁上的斯坦顿数与摩擦系数之比小于光滑壁上的斯坦顿数与摩擦系数之比，并且随着k（+）的增加而减小。

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来源
《International Journal of Heat and Fluid Flow》 |2018年第2期|83-94|共12页
作者
Forooghi Pourya; Weidenlener Alex; Magagnato Franco; Boehm Benjamin; Kubach Heiko; Koch Thomas; Frohnapfel Bettina;
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作者单位

Karlsruhe Inst Technol, Inst Fluid Mech, Kaiserstr 10, D-76131 Karlsruhe, Germany;

Karlsruhe Inst Technol, Inst Internal Combust Engines, Rintheimer Quenallee 2, D-76131 Karlsruhe, Germany;

Karlsruhe Inst Technol, Inst Fluid Mech, Kaiserstr 10, D-76131 Karlsruhe, Germany;

Tech Univ Darmstadt, Dept Energy & Power Plant Technol, Jovanka Bontschits Str 2, D-64287 Darmstadt, Germany;

Karlsruhe Inst Technol, Inst Internal Combust Engines, Rintheimer Quenallee 2, D-76131 Karlsruhe, Germany;

Karlsruhe Inst Technol, Inst Internal Combust Engines, Rintheimer Quenallee 2, D-76131 Karlsruhe, Germany;

Karlsruhe Inst Technol, Inst Fluid Mech, Kaiserstr 10, D-76131 Karlsruhe, Germany;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
Roughness; Combustion chamber deposits (CCD); Direct injection engine; Direct numerical simulation (DNS);

机译：粗糙度;燃烧室沉积物（CCD）;直接喷射引擎;直接数值模拟（DNS）;

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DNS of momentum and heat transfer over rough surfaces based on realistic combustion chamber deposit geometries

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