Multi-regime turbulent spray combustion modeling by similarity mapping

IF 5.8 2区工程技术 Q2 ENERGY & FUELS

Combustion and Flame Pub Date : 2025-06-17 DOI:10.1016/j.combustflame.2025.114271

Junyi He, Qun Hu, Lipo Wang

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引用次数: 0

Abstract

In turbulent spray combustion modeling, the primary challenge comes from the involvement of multiple physical parameters in the flamelet framework. Benefiting from the recently developed similarity mapping for the spray flamelet-progress variable model (SMFPV), the tabulation parameters can be much reduced. In general, spray combustion is characterized by multiple combustion regimes under different working conditions, for instance, the non-premixed flame at the oxidizer side and the premixed flame after complete evaporation of initially small droplets. In the present study, a unified multi-SMFPV model is proposed to account for such a multi-regime issue, by adjusting the spatial range of the evaporation source and adopting the scalar dissipation rate of mixture fraction as an additional entry parameter. Validated against three typical laminar spray counterflow flame cases, multi-SMFPV performs better than other models and aligns closely with the direct integration of the finite-rate chemistry (DIC) results. With regard to the turbulent combustion case, multi-SMFPV is also implemented to simulate the Sydney turbulent spray flame and shows reasonable accuracy.

Novelty and significance

A new version of the similarity mapping spray flamelet progress variable model, named multi-SMFPV, has been proposed to correctly capture multiple combustion regimes encountered in spray combustion. The modeling principles include adjusting the spatial range of the evaporation source and adopting the scalar dissipation rate of mixture fraction as an additional entry parameter to distinguish different combustion regimes. Predicted results of three typical laminar spray counterflow flame cases show significant improvements compared to the former version. Results of the Sydney turbulent spray flame simulation show that multi-SMFPV is also feasible in turbulent situations.

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基于相似映射的多工况湍流喷雾燃烧模拟

在湍流喷雾燃烧建模中，主要的挑战来自于小火焰框架中涉及的多个物理参数。利用最近发展起来的喷雾火焰进程变量模型（SMFPV）的相似性映射，可以大大减少制表参数。一般来说，喷雾燃烧的特点是在不同的工况下存在多种燃烧状态，如氧化剂侧的未预混火焰和初始小液滴完全蒸发后的预混火焰。本文通过调整蒸发源的空间范围，并将混合分数的标量耗散率作为附加的输入参数，提出了一个统一的多smfpv模型来考虑这一多状态问题。通过对三种典型层流喷射逆流火焰情况的验证，multi-SMFPV模型的性能优于其他模型，并且与有限速率化学（DIC）的直接集成结果密切一致。在紊流燃烧情况下，采用多smfpv模拟了悉尼紊流喷射火焰，得到了合理的精度。提出了一种新的相似映射喷雾小火焰进程变量模型，即multi-SMFPV模型，该模型能够正确地捕捉喷雾燃烧过程中遇到的多种燃烧状态。建模原理包括调整蒸发源的空间范围和采用混合分数的标量耗散率作为附加入口参数来区分不同的燃烧形式。三种典型层流喷流火焰的预测结果与前一种模型相比有显著改善。悉尼紊流喷射火焰模拟结果表明，在紊流情况下，多smfpv也是可行的。

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

Combustion and Flame 工程技术-工程：化工

CiteScore

9.50

自引率

20.50%

发文量

631

审稿时长

3.8 months

期刊介绍： The mission of the journal is to publish high quality work from experimental, theoretical, and computational investigations on the fundamentals of combustion phenomena and closely allied matters. While submissions in all pertinent areas are welcomed, past and recent focus of the journal has been on: Development and validation of reaction kinetics, reduction of reaction mechanisms and modeling of combustion systems, including: Conventional, alternative and surrogate fuels; Pollutants; Particulate and aerosol formation and abatement; Heterogeneous processes. Experimental, theoretical, and computational studies of laminar and turbulent combustion phenomena, including: Premixed and non-premixed flames; Ignition and extinction phenomena; Flame propagation; Flame structure; Instabilities and swirl; Flame spread; Multi-phase reactants. Advances in diagnostic and computational methods in combustion, including: Measurement and simulation of scalar and vector properties; Novel techniques; State-of-the art applications. Fundamental investigations of combustion technologies and systems, including: Internal combustion engines; Gas turbines; Small- and large-scale stationary combustion and power generation; Catalytic combustion; Combustion synthesis; Combustion under extreme conditions; New concepts.