高压GDI喷雾撞击：喷嘴孔口形状影响的实验与计算分析

IF 5.4 3区工程技术 Q2 ENERGY & FUELS

Thermal Science and Engineering Progress Pub Date : 2025-09-20 DOI:10.1016/j.tsep.2025.104129

Shenghao Yu , Jiangshan Jin , Jiao Wang , Jiapeng Dai

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引用次数: 0

摘要

汽油直喷（GDI）喷嘴的喷壁相互作用特性对发动机燃烧和颗粒物（PM）排放有着至关重要的影响。虽然以前的研究已经证实了椭圆喷嘴改善喷雾特性的潜力，但对其在高喷射压力条件下的喷雾-壁面相互作用行为的系统研究仍然缺乏。本文采用实验测试和数值模拟相结合的方法研究了直喷系统中圆形喷嘴和椭圆喷嘴的喷壁相互作用特性。结果表明，椭圆喷嘴由于其不对称结构，增强了空气的夹带，抑制了轴向喷雾的发展，从而减少了穿透和延迟了对壁的撞击。此外，它促进径向扩散和雾化，减少壁膜厚度。在高喷射压力下，椭圆喷嘴的小轴扩散半径比圆形喷嘴的大得多。不对称的几何结构也加强了喷雾周围的螺旋结构，导致更小的平均直径（SMD）。此外，在高背压下，椭圆喷嘴与圆形喷嘴相比，壁膜减少，具有更好的喷壁相互作用性能。椭圆喷嘴具有优异的雾化性能和更小的壁膜厚度，可以潜在地减少颗粒排放，突出了它们在清洁燃烧技术中的实际优势。

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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High-pressure GDI spray impingement: Experimental and computational analysis of nozzle orifice shape effects

The spray-wall interaction characteristics of Gasoline Direct Injection (GDI) nozzles play a crucial role in engine combustion and particulate matter (PM) emissions. While previous studies have confirmed the potential of elliptical nozzles to improve spray characteristics, a systematic investigation into their spray-wall interaction behavior under high injection pressure conditions is still lacking. This study combines experimental testing and numerical simulations to investigate the spray-wall interaction characteristics of circular and elliptical nozzles in GDI systems. The results indicate that the elliptical nozzle, due to its asymmetric structure, enhances air entrainment, which suppresses axial spray development, resulting in a reduced penetration and delayed wall impingement. Additionally, it promotes radial diffusion and atomization, reducing the wall film thickness. Under high injection pressure, the elliptical nozzle exhibits a more significant increase in the minor axis spreading radius compared to the circular nozzle. The asymmetric geometry also intensifies vortical structures surrounding the spray, leading to smaller Sauter Mean Diameter (SMD). Moreover, the elliptical nozzle demonstrates superior spray-wall interaction performance under high backpressure, with reduced wall film compared to the circular nozzle. The superior atomization and reduced wall film thickness of elliptical nozzles can potentially reduce particulate emissions, highlighting their practical benefits in cleaner combustion technologies.

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来源期刊

Thermal Science and Engineering Progress Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

7.20

自引率

10.40%

发文量

327

审稿时长

41 days

期刊介绍： Thermal Science and Engineering Progress (TSEP) publishes original, high-quality research articles that span activities ranging from fundamental scientific research and discussion of the more controversial thermodynamic theories, to developments in thermal engineering that are in many instances examples of the way scientists and engineers are addressing the challenges facing a growing population – smart cities and global warming – maximising thermodynamic efficiencies and minimising all heat losses. It is intended that these will be of current relevance and interest to industry, academia and other practitioners. It is evident that many specialised journals in thermal and, to some extent, in fluid disciplines tend to focus on topics that can be classified as fundamental in nature, or are ‘applied’ and near-market. Thermal Science and Engineering Progress will bridge the gap between these two areas, allowing authors to make an easy choice, should they or a journal editor feel that their papers are ‘out of scope’ when considering other journals. The range of topics covered by Thermal Science and Engineering Progress addresses the rapid rate of development being made in thermal transfer processes as they affect traditional fields, and important growth in the topical research areas of aerospace, thermal biological and medical systems, electronics and nano-technologies, renewable energy systems, food production (including agriculture), and the need to minimise man-made thermal impacts on climate change. Review articles on appropriate topics for TSEP are encouraged, although until TSEP is fully established, these will be limited in number. Before submitting such articles, please contact one of the Editors, or a member of the Editorial Advisory Board with an outline of your proposal and your expertise in the area of your review.