利用计算流体动力学模拟和零维建模分析小排量火花点火发动机的气缸内气流

Chandra Kumar Chandrakar, Kartheeswaran A, Varunkumar S, Tnc Anand, Mayank Mittal
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引用次数: 0

摘要

在进气冲程和压缩冲程中,气缸内流动的演变涉及小型和大型结构,对燃料-空气混合和燃烧过程产生重大影响。人们已经利用激光诊断方法、计算流体动力学(CFD)模拟和基于零维(0-D)建模的方法,对大中型发动机内的流动演变进行了广泛的研究。然而,在本研究中,我们对排量为 110 立方厘米的小缸径火花点火发动机中的流场演变进行了详细分析。该分析采用了一种独特的方法,即利用测量的粒子图像测速仪(PIV)数据进行 CFD 模拟和验证。随后,利用经过验证的 CFD 结果来开发和验证基于 0-D 的模型,因为它的计算效率更高。通过计算翻滚率和湍流动能(TKE),验证后的 CFD 模拟和基于 0-D 的模型被用于评估流场的量化强度。利用 CFD 模拟获得的流场流线和速度矢量来解释这些参数在进气和压缩冲程中的演变。研究进一步扩展到分析发动机转速对流场演变的影响。随着发动机转速的增加,在压缩冲程末端观察到相对较高的翻滚比和 TKE 值,这有望改善燃料-空气混合和燃烧效率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Analysis of In-cylinder Flow in a Small-Bore Spark-Ignition Engine Using Computational Fluid Dynamics Simulations and Zero-Dimensional-Based Modeling
The evolution of in-cylinder flow involves small and large-scale structures during the intake and compression strokes, significantly influencing the fuel-air mixing and combustion processes. Extensive research has been conducted to investigate the flow evolution in medium to large-sized engines using laser-based diagnostic methods, computational fluid dynamics (CFD) simulations, and zero-dimensional (0-D) based modeling. However, in the present study, we provide a detailed analysis of the evolution of flow fields in a small-bore spark ignition engine with a displacement volume of 110 cm3. This analysis employs a unique methodology where CFD simulation is performed and validated using measured particle image velocimetry (PIV) data. Subsequently, the validated CFD results are utilized to develop and validate a 0-D-based model as it is computationally more efficient. The validated CFD simulation and 0-D-based model are used to evaluate the quantified strength of the flow fields by calculating the tumble ratio and turbulent kinetic energy (TKE). The streamlines and velocity vectors of the flow fields obtained from CFD simulations are utilized to explain the evolution of these parameters during intake and compression strokes. The study is further extended to analyze the effect of engine speed on the evolution of flow fields. With an increase in engine speed, relatively higher values of tumble ratio and TKE at the end of the compression stroke are observed, which is expected to improve the fuel-air mixing and combustion efficiency.
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