A numerical study on the effect of thermal and charge stratification on the HCCI natural gas engine

Pourfallah, Mohsen; Armin, Mahbod; Ranjbar, A.A.

doi:10.1080/01430750.2019.1608860

Cited by 6 publications

(4 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Based on the analysis of thermal charge stratification, they conclude that higher GP temperatures result in a broader temperature distribution and a higher fraction of mixture at elevated temperatures, thus resulting in earlier ignition and prolonged combustion duration. Pourfallah et al 34 found a similar effect of a GP on natural gas HCCI combustion using 3D-CFD simulations. Beyond the scope of CI engines, the work of Scholl 21 demonstrates the use of a dedicated hot surface ignition (HSI) system based on a ceramic GP to extend the lean burn limit of a naturally aspirated gas engine over a wide range of intake pressures compared to the prechamber spark plug of the series engine.…”

Section: Introductionmentioning

confidence: 77%

“…For the sake of clarity, it is important to note that the HSACI process described here should not to be confused with the HSACI term used by Aesoy and Valland 28,29 in their work on GP assistance in natural gas jet diffusion flame combustion. This approach differs from that of previous HCCI studies using GPs, 33,34 since the control of combustion relies on the intentional hot surface ignition of a small portion of mixture, rather than altering combustion phasing by means of thermal mixture stratification. In order to test the HSACI concept under challenging ignition conditions, a natural gas fueled naturally aspirated engine is used as the test-bed engine.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental study on controlled hot surface assisted compression ignition (HSACI) in a naturally aspirated single cylinder gas engine

Judith

Kettner

Koch

et al. 2022

International Journal of Engine Research

View full text Add to dashboard Cite

Homogeneous charge compression ignition (HCCI) promises low [Formula: see text] emissions and high efficiency due to fast combustion at low temperatures. However, the control of combustion timing represents a serious challenge due to the lack of dedicated ignition control parameters. This challenge is addressed in this work by means of a hot surface ignition (HSI) system, whose core element consists of a shielded, electrically heated ceramic glow plug. In this approach, termed as hot surface assisted compression ignition (HSACI), a small portion of mixture is thought to ignite in the vicinity of the shielded glow plug and to subsequently propagate to the main combustion chamber in order to initiate bulk-gas auto-ignition. Adjusting the hot surface temperature enables to either advance or retard the onset of combustion and thus, allows to control combustion timing. This paper presents experimental results of initial engine trials, using the HSACI concept in a naturally aspirated single cylinder natural gas engine. Measurements were conducted at a constant engine speed of 1400 l/min and include intake air temperatures in the range of 150–175°C and relative air-fuel ratios ([Formula: see text]) from 2.0 to 2.8. Results show that the HSI system enables combustion under conditions, which do not allow for pure HCCI operation. Moreover, the combustion timing can be actively controlled within certain limits by changing the HSI temperature. Increasing cycle-to-cycle variations limit stable operation at lower temperatures, while a transition to pure HCCI is found at intake temperatures beyond 170°C. The applicable [Formula: see text] range is limited by knocking or uncontrolled combustion toward the rich side and instable operation toward the lean side. Loss analysis points out that wall heat flow and imperfect combustion represent the dominant loss mechanisms. Heat release analysis reveals two pronounced phases, indicating initial flame propagation and subsequent auto-ignition similar to spark assisted compression ignition (SACI).

show abstract

Section: Introductionmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Experimental study on controlled hot surface assisted compression ignition (HSACI) in a naturally aspirated single cylinder gas engine

Judith

Kettner

Koch

et al. 2022

International Journal of Engine Research

View full text Add to dashboard Cite

show abstract

“…However, the majority studies on the piston geometry conducted in the CFD approach have focused on CI engines [20,30,31]. Regarding the HCCI-PFI engine, most studies have yet to be conducted on the piston bowl geometry design [32][33][34][35]. Researching HCCI-PFI is essential because it enables adequate time for thorough air and fuel mixing, leading to an entirely homogeneous mixture and improved performance.…”

Section: Introductionmentioning

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

View full text Add to dashboard Cite

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.

show abstract

“…Most studies on the piston geometry employed in CFD, however, have focused on CI engines [22,30,31]. Regarding HCCI, most studies do not emphasise on piston geometry design [32][33][34][35]. Therefore, it is essential to conduct a study utilising CFD techniques for HCCI engines since the engine offers several advantages in terms of emissions and performance.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of piston bowl geometries on PFI-HCCI engine performance

Nik Ab Rashid,

Hairuddin,

Md Rezali

et al. 2023

JMES

View full text Add to dashboard Cite

Homogeneous charge compression ignition (HCCI) is an advanced combustion strategy proposed to provide higher efficiency and lower emissions than conventional compression ignition. However, there are still tough challenges in the successful operation of HCCI engines. Among these challenges, homogeneous mixture preparation and combustion phase control plays a vital role in determining the efficiency and emissions. Piston bowl geometry significantly enhances the process by improving the flow, turbulence, and mixing for the combustion. The study utilised experimental and numerical simulation methods to analyse HCCI combustion in port fuel injection (PFI) mode and evaluate the effect of piston geometries on engine performance. For this purpose, the different pistons bowl geometries (Baseline model, SQC, and CCC) with the same volume, compression, and equivalence ratio were numerically tested in a four-stroke, single-cylinder, YANMAR diesel engine. The numerical simulation results provide adequate assurance to proceed with the study with different piston geometries design. Compared to SQC and CCC, the Baseline model produced significantly higher cylinder pressure, temperature, and heat release rate. Different piston shape designs influenced the formation of air-fuel mixing, thereby affecting the time and location of onset combustion. The present investigation offered the significant role of piston geometry for the control mechanism of PFI-HCCI combustion, that is a vital part in demonstrating HCCI combustion.

show abstract

A numerical study on the effect of thermal and charge stratification on the HCCI natural gas engine

Cited by 6 publications

References 23 publications

Experimental study on controlled hot surface assisted compression ignition (HSACI) in a naturally aspirated single cylinder gas engine

Experimental study on controlled hot surface assisted compression ignition (HSACI) in a naturally aspirated single cylinder gas engine

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 study of piston bowl geometries on PFI-HCCI engine performance

Contact Info

Product

Resources

About