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Effects of Partial Premixing and Coflow Temperature on Flame Stabilization of Lifted Jet Flames of Dimethyl Ether in a Vitiated Coflow Based on Stochastic Multiple Mapping Conditioning Approach

التفاصيل البيبلوغرافية
العنوان: Effects of Partial Premixing and Coflow Temperature on Flame Stabilization of Lifted Jet Flames of Dimethyl Ether in a Vitiated Coflow Based on Stochastic Multiple Mapping Conditioning Approach
المؤلفون: Sanjeev Kumar Ghai, Rajat Gupta, Santanu De
المصدر: Fluids, Vol 9, Iss 6, p 125 (2024)
بيانات النشر: MDPI AG, 2024.
سنة النشر: 2024
المجموعة: LCC:Thermodynamics
LCC:Descriptive and experimental mechanics
مصطلحات موضوعية: jet in hot coflow, dimethyl ether, partially premixed combustion, multiple mapping conditioning, flame lift-off, Thermodynamics, QC310.15-319, Descriptive and experimental mechanics, QC120-168.85
الوصف: The Reynolds-averaged Navier–Stokes (RANS)-based stochastic multiple mapping conditioning (MMC) approach has been used to study partially premixed jet flames of dimethyl ether (DME) introduced into a vitiated coflowing oxidizer stream. This study investigates DME flames with varying degrees of partial premixing within a fuel jet across different coflow temperatures, delving into the underlying flame structure and stabilization mechanisms. Employing a turbulence k-ε model with a customized set of constants, the MMC technique utilizes a mixture fraction as the primary scalar, mapped to the reference variable. Solving a set of ordinary differential equations for the evolution of Lagrangian stochastic particles’ position and composition, the molecular mixing of these particles is executed using the modified Curl’s model. The lift-off height (LOH) derived from RANS-MMC simulations are juxtaposed with experimental data for different degrees of partial premixing of fuel jets and various coflow temperatures. The RANS-MMC methodology adeptly captures LOH for pure DME jets but exhibits an underestimation of flame LOH for partially premixed jet scenarios. Notably, as the degree of premixing escalates, a conspicuous underprediction in LOH becomes apparent. Conditional scatter and contour plots of OH and CH2O unveil that the propagation of partially premixed flames emerges as the dominant mechanism at high coflow temperatures, while autoignition governs flame stabilization at lower coflow temperatures in partially premixed flames. Additionally, for pure DME flames, autoignition remains the primary flame stabilization mechanism across all coflow temperature conditions. The study underscores the importance of considering the degree of premixing in partially premixed jet flames, as it significantly impacts flame stabilization mechanisms and LOH, thereby providing crucial insights into combustion dynamics for various practical applications.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 2311-5521
Relation: https://www.mdpi.com/2311-5521/9/6/125; https://doaj.org/toc/2311-5521
DOI: 10.3390/fluids9060125
URL الوصول: https://doaj.org/article/c9b7c3f90d4c4c5fb861b294458d57eb
رقم الأكسشن: edsdoj.9b7c3f90d4c4c5fb861b294458d57eb
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:23115521
DOI:10.3390/fluids9060125