具有蒸发喷雾过程的大涡数值模拟

删除或更新信息，请邮件至freekaoyan#163.com(#换成@)

本站小编 Free考研考试/2024-01-16

-->

单聪慧,徐宝鹏.具有蒸发喷雾过程的大涡数值模拟[J].,2018,58(2):111-117

具有蒸发喷雾过程的大涡数值模拟

Large eddy simulation of evaporating spray

DOI：10.7511/dllgxb201802001

中文关键词:燃油喷雾大涡数值模拟蒸发网格相关性碰撞模型

英文关键词:fuel spray large eddy simulation evaporation grid dependency collision model

基金项目:大连理工大学重大项目培育基金资助项目(DUT17ZD307).

作者	单位
单聪慧,徐宝鹏

摘要点击次数:1305

全文下载次数:2062

中文摘要:

采用大涡数值模拟方法对不同气体密度条件下无蒸发和有蒸发燃油喷雾进行了数值模拟，重点研究喷雾形状、喷雾贯穿距离以及粒子索特平均半径的预测值与计算网格的相关性以及亚网格脉动速度对喷雾过程的影响．计算公式采用单方程亚网格湍流模型、ETAB破碎模型和基于粒子云的碰撞模型．在有无蒸发两种喷雾条件下贯穿距离和索特平均半径的预测值与实验值吻合较好，并实现了预测值与计算网格无关性．亚网格脉动速度对喷雾贯穿距离和索特平均半径影响较小，但是影响喷雾形状和粒子分布．具有蒸发的喷雾贯穿距离与无蒸发喷雾情况类似，但是由于蒸发作用，索特平均半径预测值表现出波动现象．

英文摘要:

Large eddy simulation approach is employed to simulate fuel sprays with and without evaporation under different gas densities, and emphasis is placed on spray shape, the grid dependency of predicted spray tip penetration and Sauter mean radius (SMR) and the effect of sub-grid scale (SGS) fluctuating velocity on spray process. The numerical formulation adopts single equation SGS turbulence model, ETAB breakup model and collision model based on particle cloud. The predicted spray tip penetration and SMR are in good agreement with experimental data, and grid-independent results are achieved for both non-evaporating and evaporating sprays. It is found that SGS fluctuating velocity has little influence to the predictions of both spray tip penetration and SMR, but affects the spray shapes and particle distribution. The predicted spray tip penetration behaves similarly for both non-evaporating and evaporating sprays, although the prediction of SMS shows more vigorous fluctuations for the evaporating case due to the effect of evaporation.

查看全文查看/发表评论下载PDF阅读器

关闭

具有蒸发喷雾过程的大涡数值模拟

本站小编 Free考研考试/2024-01-16

相关话题/

领限时大额优惠券,享本站正版考研考试资料!