Raul Payri, JOSE M GARCIA-OLIVER, Ricardo Novella, Jose M. Pastor, Weiwei Shang, Dario López-Pintor
{"title":"Application of an Optimized Mechanism of Primary Reference Fuel to Single Hole Sprays","authors":"Raul Payri, JOSE M GARCIA-OLIVER, Ricardo Novella, Jose M. Pastor, Weiwei Shang, Dario López-Pintor","doi":"10.1615/atomizspr.2024051862","DOIUrl":null,"url":null,"abstract":"The present work focuses on the derivation and evaluation of a chemical kinetic mechanism of Primary Reference Fuel (PRF, binary blends of n-heptane and isooctane) with a homogeneous reactors approach starting from a detailed one. Results show that the optimized mechanism can replicate the results of the detailed one with high accuracy. The mechanism is integrated into a Computational Fluid Dynamics workflow combining a Reynolds-Averaged Navier–Stokes approach, a diffuse-interface spray and an unsteady flamelet progress variable combustion models. The workflow is validated against spray combustion measurements following the standards of the Engine Combustion Network (ECN). Test cases sweep binary blends of PRF fuels from pure n-heptane to pure iso-octane using an ECN Spray A nozzle. The model can provide accurate predictions of typical reacting spray metrics such as ignition delay and lift-off length, which have been evaluated following a reconstruction of the experimental methods of schlieren and OH* chemiluminescence. Different definitions of the previous combustion metrics have been compared. The model captures the decreasing reactivity with increasing iso-octane fraction, which results in flame stabilizing at much leaner conditions. However, deficiencies are observed for low reactivity cases, either with high PRF or low temperature cases.","PeriodicalId":8637,"journal":{"name":"Atomization and Sprays","volume":null,"pages":null},"PeriodicalIF":1.0000,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Atomization and Sprays","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1615/atomizspr.2024051862","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
Abstract
The present work focuses on the derivation and evaluation of a chemical kinetic mechanism of Primary Reference Fuel (PRF, binary blends of n-heptane and isooctane) with a homogeneous reactors approach starting from a detailed one. Results show that the optimized mechanism can replicate the results of the detailed one with high accuracy. The mechanism is integrated into a Computational Fluid Dynamics workflow combining a Reynolds-Averaged Navier–Stokes approach, a diffuse-interface spray and an unsteady flamelet progress variable combustion models. The workflow is validated against spray combustion measurements following the standards of the Engine Combustion Network (ECN). Test cases sweep binary blends of PRF fuels from pure n-heptane to pure iso-octane using an ECN Spray A nozzle. The model can provide accurate predictions of typical reacting spray metrics such as ignition delay and lift-off length, which have been evaluated following a reconstruction of the experimental methods of schlieren and OH* chemiluminescence. Different definitions of the previous combustion metrics have been compared. The model captures the decreasing reactivity with increasing iso-octane fraction, which results in flame stabilizing at much leaner conditions. However, deficiencies are observed for low reactivity cases, either with high PRF or low temperature cases.
期刊介绍:
The application and utilization of sprays is not new, and in modern society, it is extensive enough that almost every industry and household uses some form of sprays. What is new is an increasing scientific interest in atomization - the need to understand the physical structure of liquids under conditions of higher shear rates and interaction with gaseous flow. This need is being met with the publication of Atomization and Sprays, an authoritative, international journal presenting high quality research, applications, and review papers.