Effect of combustion chamber shape on tumble flow, squish-generated flow and burn rate

Fujimoto, Masahiko; Iwai, Kohei; Kataoka, Motoshi; Tabata, Michihiko

doi:10.1016/s0389-4304(02)00201-1

Cited by 18 publications

(5 citation statements)

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“…The dissipation of the tumble in the smaller vortex, as it encounters non-planar surfaces on the piston bowl, is a crucial characteristic for fuel distribution within the combustion chamber. However, it also dissolves flow energy, which is beneficial for the development of flames during the combustion process [42,43]. As for the heat release rate, the results revealed that the combustion occurred at various crank angle positions.…”

Section: In-cylinder Pressure and Heat Release Rate In Pfi Engine App...mentioning

confidence: 97%

“…Lastly, the third character encompasses a bowl design that can generate a substantial level of swirl, thereby facilitating the optimal air-fuel mixing for the combustion process. The models were chosen based on their performance on spark ignition (SI) and compression ignition (CI) engines by previous researchers and are presently being investigated in homogeneous charge compression ignition (HCCI) engines [41][42][43]. Fig.…”

Section: Simulation Setupmentioning

confidence: 99%

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Computational Fluid Dynamics (CFD) Validation and Investigation the Effect of Piston Bowl Geometries Performance on Port Fuel Injection-Homogeneous Charge Compression Ignition (PFI-HCCI) Engines

Nik Muhammad Hafiz Nik Ab Rashid,

Abdul Aziz Hairuddin,

Khairil Anas Md Rezali

et al. 2024

ARNHT

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Homogeneous charge compression ignition (HCCI) is an advanced combustion strategy proposed to provide higher efficiency and lower emissions than conventional compression ignition. Nevertheless, the operation of HCCI engines still presents formidable challenges. Preparing homogeneous mixtures and controlling the combustion phase are crucial challenges in the context of engine performance. Piston bowl geometry significantly enhances the process by improving the flow and facilitating air-fuel mixing for combustion. On that note, this study utilised the CFD simulation methods to analyse HCCI combustion in port fuel injection (PFI) mode and evaluate the effect of piston bowl geometries on engine performance. For this purpose, the CFD simulation result for a single-cylinder, four-stroke YANMAR diesel engine was validated with experimental data. The different piston bowl geometries with the same volume, compression, and equivalence ratio were then investigated numerically. The validation result of the CFD simulation offers enough confidence to continue the study with different piston bowl geometries. The results attained from the Direct Injection (DI) engine piston bowl application demonstrate a minor change in in-cylinder pressure and heat release rate. The piston bowl design employed in a Port Fuel Injection engine application exhibited different combustion phases while demonstrating similarity in attaining in-cylinder pressure. The findings for swirl induce piston bowl design indicate an enhancement of in-cylinder pressure for the Spiral Crown geometry model, reaching 9.42 MPa. The results of the study demonstrated that the piston bowl's design affected the performance of an HCCI engine.

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Section: In-cylinder Pressure and Heat Release Rate In Pfi Engine App...mentioning

confidence: 97%

Section: Simulation Setupmentioning

confidence: 99%

Computational Fluid Dynamics (CFD) Validation and Investigation the Effect of Piston Bowl Geometries Performance on Port Fuel Injection-Homogeneous Charge Compression Ignition (PFI-HCCI) Engines

Nik Muhammad Hafiz Nik Ab Rashid,

Abdul Aziz Hairuddin,

Khairil Anas Md Rezali

et al. 2024

ARNHT

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“…Rotating flow is proved to increase the turbulence intensity and consequently reduces burning period and increases thermal efficiency. Several works either experimental or numerical has been done considering the role of the flow patterns in the overall engine efficiency [1][2][3][4][5][6]. Also, a comprehensive review of the early efforts to demonstrate the effects of flow field on the engine efficiency can be seen in the work of Hill et al [7].…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Formation and Development of in-Cylinder Rotational Flow in a Spark Ignition Engine

Yousefi

Ommi

Farajpour

2011

AMM

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In this study a CFD model of a spark ignition (SI) engine was prepared using KIVA-3V code and experimental data to investigate the in-cylinder flow field. The whole engine cycle was simulated and the validity of the model was ascertained by experimental result of in-cylinder bulk pressure and flow field visualization. The flow pattern inside the cylinder was investigated qualitatively to deepen our understanding of the formation and development of rotational flow prior to the ignition. Both tumble and swirl were observed in the flow field. The numerical results showed that turbulence intensity in the section with stronger vortex is higher.

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“…Figura 28 -Efeito da área de compressão inclinada sobre a performance do motor (UEDA et al, 1999) Figura 29 -Efeito da localização da área de compressão (FUJIMOTO et al, 2002) Figura 30 -Câmara tipo "T" (MALEEV, 1945) Figura 31 -Câmaras Tipo "L" de baixa turbulência (a) e alta turbulência (b) (MALEEV, 1945) Figura 32 -Câmara Tipo "F" (JUDGE, 1965) Figura 33 -Câmara em forma de coração (HEISLER, 1995) 52…”

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“…Fujimoto et al (2002) mediram o efeito do pistão com 20 % de área de compressão na região da válvula de admissão (intake squish piston), assim como na área de descarga (exhaust squish piston) sobre o FRV, o FRC e o FRE no interior de cilindro, e suas respectivas influências no ângulo de queima e controle de detonação. Com a área de compressão no lado da válvula de admissão, a alta taxa de troca de calor ao final da combustão, devido ao acentuado FRE, possui efeito antidetonante;…”

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Um estudo sobre a evolução das câmaras de combustão dos motores do ciclo Otto à gasolina e sua aplicação ao etanol hidratado como combustível alternativo

Souza¹

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À empresa RH Retificadora. À minha esposa Adriana. À minha filha Dâmaris. Devo ainda enfocar a imensa colaboração da RH Retificadora para a confecção do banco de dados apresentado nessa dissertação, por meio da disponibilização de seu espaço físico para trabalho de campo, bem como de seu acervo técnico e material, como: manuais, catálogos, e cabeçotes para fins de análises e sessões fotográficas, porém, isentando-a de quaisquer responsabilidades sobre os dados apresentados. Esta obra foi desenvolvida com o imenso apoio do CNPq. SUMÁRIO ii SUMÁRIO 1 Introdução _________________________________________________ 2 Motores de combustão interna do Ciclo Otto ______________________ 3 Etanol Hidratado Como Combustível Alternativo __________________ 4 Processo de formação da mistura ar-combustível __________________ 4.1 Volatilidade__________________________________________________ 4.2 Tipo de mistura ______________________________________________ 4.2.1 Motor de Mistura Homogênea _____________________________________ 4.2.2 Motor de Carga Estratificada ______________________________________ 4.2.3 Efeito das Condições Operacionais Sobre o Requisito de Mistura __________ 4.3 Dinâmica da Admissão ________________________________________ 4.3.1 Influência do Coletor de Admissão__________________________________ 4.3.2 Influência do Duto de Admissão do Cabeçote _________________________ 4.3.3 Influência da configuração da Válvula de Admissão ____________________ 5 Formação da mistura ar-combustível na Câmara de Combustão _____ 5.1 Área de compressão e resfriamento (Squish e Quench) ______________ 5.2 Relação Superfície / Volume ____________________________________ 5.3 Relação Curso / diâmetro ______________________________________ 6 A combustão nos motores de ignição por centelha_________________ 29 6.1 Velocidade e percurso da frente de chama, taxa de queima e desenvolvimento de pressão _____________________________________________ 6.1.1 Efeito da Rotação do Motor _______________________________________ 6.1.2 Efeito da Pressão de Admissão _____________________________________ 6.1.3 Efeito da Razão Entre as Pressões de Descarga e Admissão ______________ 6.1.4 Efeito da Relação Combustível / ar__________________________________ SUMÁRIO iii 6.1.5 Efeito do Número e Posições das Velas de Ignição na Câmara de Combustão 33 6.2 Pré-ignição __________________________________________________ 6.3 Detonação ___________________________________________________ 6.4 Emissões de Poluentes _________________________________________ 6.5 Influência da câmara de combustão sobre a performance e emissões do motor ____________________________________________________________ 7 Estado da arte das câmaras de combustão _______________________ 48 7.1 Aspéctos gerais dos projetos das câmaras de combustão _____________

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Effect of combustion chamber shape on tumble flow, squish-generated flow and burn rate

Cited by 18 publications

References 0 publications

Computational Fluid Dynamics (CFD) Validation and Investigation the Effect of Piston Bowl Geometries Performance on Port Fuel Injection-Homogeneous Charge Compression Ignition (PFI-HCCI) Engines

Computational Fluid Dynamics (CFD) Validation and Investigation the Effect of Piston Bowl Geometries Performance on Port Fuel Injection-Homogeneous Charge Compression Ignition (PFI-HCCI) Engines

Numerical Investigation of Formation and Development of in-Cylinder Rotational Flow in a Spark Ignition Engine

Um estudo sobre a evolução das câmaras de combustão dos motores do ciclo Otto à gasolina e sua aplicação ao etanol hidratado como combustível alternativo

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