Numerical simulation of the influence of the structural parameters of a sampling diluter for particulate matter in diesel engines on the internal flow field and dilution ratio

IF 3.5 3区 工程技术 Q3 ENERGY & FUELS Energy Science & Engineering Pub Date : 2024-06-27 DOI:10.1002/ese3.1761
Limin Geng, Yang Zhao, Guifen Sheng, Nan Gao, Yonggang Xiao, Feichuang Huang, Hao Chen
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Abstract

This study investigated how structural parameters (including injection ducts and exhaust nozzle inner diameters) affect the internal flow field and dilution ratio of diesel particulate sampling diluters. Increasing air injection duct diameter increased the injection chamber pressure and decreased the air velocity peak, mixed gas flow velocity, sample temperature, and mixing rate. Excessively small tube diameters caused uneven and discontinuous flow field distributions, while substantial air blockage rendered the flow state poor. Increasing nozzle inner diameters increased the exhaust flow area and the sample temperature, but decreased the velocity of the exhaust and gas mixtures and the pressure drop. Compared with a 2.0 mm inner diameter, 2.5 and 3.0 mm diameters decreased the peak velocity by 11.18% and 14.41%, respectively, and mixing slowed significantly. Inner nozzle diameters of <1.5 mm increased the pressure drop significantly; the exhaust velocity also increased, exceeding the air velocity at the mixing position. The dilution ratio and relative error decreased with increasing inner nozzle diameter. At an air injection duct and an inner nozzle diameter of 0.1 and 2.0 mm, respectively, the dilutor's flow field distribution improved, the mixed gas flow stabilized, and the dilution ratio and relative error were 21.34% and 6.74%, respectively.

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柴油发动机颗粒物取样稀释器结构参数对内部流场和稀释率影响的数值模拟
本研究探讨了结构参数(包括喷射管道和排气喷嘴内径)如何影响柴油微粒采样稀释器的内部流场和稀释率。增加空气喷射管直径会增加喷射室压力,降低空气流速峰值、混合气体流速、样品温度和混合率。过小的管道直径会导致流场分布不均匀和不连续,而大量的空气阻塞会使流动状态变差。增加喷嘴内径可增加排气流动面积和样品温度,但会降低排气和气体混合物的速度和压降。与内径为 2.0 毫米的喷嘴相比,内径为 2.5 毫米和 3.0 毫米的喷嘴的峰值速度分别降低了 11.18% 和 14.41%,混合速度明显减慢。内径为 1.5 毫米的喷嘴大大增加了压降;排气速度也增加了,超过了混合位置的空气速度。稀释率和相对误差随着内喷嘴直径的增大而减小。当空气注入管道和内喷嘴直径分别为 0.1 毫米和 2.0 毫米时,稀释器的流场分布得到改善,混合气体流量趋于稳定,稀释率和相对误差分别为 21.34% 和 6.74%。
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来源期刊
Energy Science & Engineering
Energy Science & Engineering Engineering-Safety, Risk, Reliability and Quality
CiteScore
6.80
自引率
7.90%
发文量
298
审稿时长
11 weeks
期刊介绍: Energy Science & Engineering is a peer reviewed, open access journal dedicated to fundamental and applied research on energy and supply and use. Published as a co-operative venture of Wiley and SCI (Society of Chemical Industry), the journal offers authors a fast route to publication and the ability to share their research with the widest possible audience of scientists, professionals and other interested people across the globe. Securing an affordable and low carbon energy supply is a critical challenge of the 21st century and the solutions will require collaboration between scientists and engineers worldwide. This new journal aims to facilitate collaboration and spark innovation in energy research and development. Due to the importance of this topic to society and economic development the journal will give priority to quality research papers that are accessible to a broad readership and discuss sustainable, state-of-the art approaches to shaping the future of energy. This multidisciplinary journal will appeal to all researchers and professionals working in any area of energy in academia, industry or government, including scientists, engineers, consultants, policy-makers, government officials, economists and corporate organisations.
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