ABSTRACT

The present numerical study aims to numerically investigate the dynamic and turbulent characteristics of a two-dimensional and turbulent offset jet. Three different parameters were investigated: The Reynolds numbers (Re) which was varied from 10000 to 30000, wall inclination angle (α) that was from −20° to +20° and finally the offset ratio (OR) which extends from 3.25–13. Ansys Fluent was numerical CFD solver used in this present investigation. The simultaneous effects of the OR, Re and α were investigated in details. The velocity and pressure contours showed that these three parameters do not contribute equally in the development of such a flow. Also, the turbulent characteristics, such as the turbulence intensities and energies depicted how each parameter influences, separately, the turbulent flow production. Furthermore, different of tripled parameters correlations were developed. These correlations may be of help to more understand certain offset jet flow features more accurately and to predict their exact values.

摘要

目前的数值研究旨在数值研究二维湍流偏移射流的动力学和湍流特性。研究了三个不同的参数：雷诺数 (Re) 从 10000 到 30000 不等，壁倾角 (α) 从 -20° 到 +20°，最后是偏移比 (OR)，从 3.25 到 13 . Ansys Fluent 是本次调查中使用的数值 CFD 求解器。详细研究了 OR、Re 和 α 的同时影响。速度和压力等值线表明，这三个参数在这种流动的发展中的贡献并不相同。此外，湍流特性，例如湍流强度和能量，分别描述了每个参数如何影响湍流产生。此外，开发了不同的三元参数相关性。这些相关性可能有助于更准确地了解某些偏移射流特征并预测它们的确切值。