Investigation of transverse jet arrangement on mixing characteristics in a circular-to-rectangular nozzle

IF 6.1 2区工程技术 Q2 ENERGY & FUELS

Applied Thermal Engineering Pub Date : 2025-04-14 DOI:10.1016/j.applthermaleng.2025.126496

Wenchong Xia, Bo Zhang, Huazhe Zhu, Zhuang Ma, Jingjing Li

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Abstract

The transverse jets were introduced into the wide side and narrow side of the rectangular exit, based on the circular to rectangular nozzle. The simulations were performed using LES to reveal the spatiotemporal evolution characteristics of coherent vortex structures induced by transverse jet-hot jet interactions and their influence on mixing and cooling performance. Under a mass flow rate of 2%, we investigated the effect of transverse jets injection from wide side and narrow side on the high-temperature zone and analyzed the influence mechanism of transverse jet configurations on the entrainment effect of streamwise vortexes. The transverse jets effectively decreased the area of the high-temperature zone along the flow direction. Upon transverse flow injection, the shear effect induced by the velocity difference between the transverse and hot jets generated a counter-rotating vortex pair, which interacted with vortex rings, accelerating their dissipation into hairpin and spiral vortices. As the momentum ratio increased, the penetration depth of the transverse jet also augmented. At a constant momentum ratio, the penetration depth of transverse jets introduced from the wide side was greater than that of transverse jets introduced from the narrow side. It was found that When transverse jets were bilaterally injected at the wide side of the rectangular nozzle, the length of high temperature zone was effectively reduced by 53.6%.

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圆-矩形喷嘴内横向射流排列对混合特性的影响

在圆-矩形喷管的基础上，在矩形出口的宽侧和窄侧分别引入了横向射流。利用LES模拟揭示了横向射流-热射流相互作用引起的相干涡结构的时空演化特征及其对混合和冷却性能的影响。在质量流量为2%的情况下，研究了宽侧和窄侧横向射流对高温区的影响，分析了横向射流构型对顺流涡夹带效果的影响机理。横向射流有效地减小了沿流动方向的高温区面积。横向注入后，横向射流与热射流速度差引起的剪切效应产生反向旋转涡对，并与涡环相互作用，加速涡环耗散为发夹涡和螺旋涡。随着动量比的增大，横向射流的侵彻深度也增大。在一定动量比下，宽侧引入的横向射流穿透深度大于窄侧引入的横向射流穿透深度。结果表明，在矩形喷管宽侧双侧注入横向射流时，有效地缩短了高温区长度53.6%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Thermal Engineering 工程技术-工程：机械

CiteScore

11.30

自引率

15.60%

发文量

1474

审稿时长

57 days

期刊介绍： Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.