Modelling and Experimental Investigations of Supercharged HCCI Engines

Gharahbaghi, Shadi; Wilson, T.; Xu, Hongming; Cryan, Simon; Richardson, Steve; Wyszyński, Miroslaw L.; Misztal, Jacek

doi:10.4271/2006-01-0634

Cited by 19 publications

(12 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…E a = R T λ + ln( A/ A ) . (13) In Fig. 12 the trends in the experimental data and the mechanism predictions are shown; as in Fig.…”

Section: Comparison Of Experiments and Mechanismmentioning

confidence: 95%

“…With many of these alternative schemes combustion chemistry is extremely important. Future designs are expected to employ such novel lean/dilute regimes, sometimes in combination with conventional SI and CI operation, where high boost (inlet pressures up to 5-6 bar) and/or extreme compression ratio (CR to 50:1) could be used to address power density and energy loss issues [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. In these engines ignition pressures could reach 100-300 bar, which is substantially higher than in current production engines where 0010 peak pressures are generally limited to ∼200 bar.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A chemical kinetically based ignition delay correlation for iso-octane covering a wide range of conditions including the NTC region

Goldsborough

2009

Combustion and Flame

View full text Add to dashboard Cite

“…E a = R T λ + ln( A/ A ) . (13) In Fig. 12 the trends in the experimental data and the mechanism predictions are shown; as in Fig.…”

Section: Comparison Of Experiments and Mechanismmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

A chemical kinetically based ignition delay correlation for iso-octane covering a wide range of conditions including the NTC region

Goldsborough

2009

Combustion and Flame

View full text Add to dashboard Cite

“…The DI system of the Jaguar V6 engine is a single nozzle, wall-guided, first generation Denso system. The engine and its test rig have been described in detail in previous publications [9,17,18]. To switch between the SI and HCCI modes of operation, a cam profile switching (CPS) system is used.…”

Section: Enginementioning

confidence: 99%

Effect of injection timing on gasoline homogeneous charge compression ignition particulate emissions

Misztal

Wyszyński

et al. 2009

International Journal of Engine Research

View full text Add to dashboard Cite

Particulate emissions from homogeneous charge compression ignition (HCCI) engines are often considered as negligible and the measurement of particulate matter (PM) with HCCI combustion systems has been rare. An earlier publication in the literature and the authors' own recently published work suggest that PM emissions from gasoline direct injection (DI) HCCI engines should not be neglected. It has been shown that PM emissions from HCCI engines, although generally lower, can be similar to spark ignition (SI) levels for certain engine conditions, especially in the accumulation mode. The present work shows that although injection timing is effective for control of HCCI, it can have a significant impact on PM emissions. Engine speed also appears to have an impact on PM emissions for the HCCI combustion mode. Typically for HCCI operating at 1500 r/min, the total mass and total number of the PM emissions could be up to six times higher when the fuel is injected during the recompression period compared with the case for injection during the inlet valve open period. Similarly, when the engine was operated in SI mode, an attempt to inject fuel close to induction top dead centre (TDC) made the PM emission noticeably higher, reaching unacceptable levels. The split injection strategy for HCCI mode has been investigated for its effect on PM emissions. It has been found that the PM number concentration for split injection lies between the maximum concentration measured for very early injections (near TDC at recompression) and the minimum concentration measured for the latest injections used (at crank angles near to the inlet valve maximum opening time), with the magnitude of number density varying approximately from 0.2 to 1.2 million/cm3. It is also observed that for split injection the number of particulates in nucleation mode varies less, while the number in accumulation mode level varies within a limit of one order of magnitude; both are dependent on the injection strategy. The shape of the PM distribution is such that the nucleation mode exceeds the number concentration of 1×107 (d N d log Dp) and the accumulation mode falls parabolically to approximately 1×106. For comparison, it can be said that the PM number concentration measured in the authors' engine is approximately one order of magnitude lower in accumulation mode than the level for a typical modern diesel engine.

show abstract

“…In order to characterize HCCI combustion with negative valve overlap and to obtain initial data for the models developed in this study, experiments on a Jaguar V6 HCCI engine, previously described in references [19] and [20], have been performed and followed by data analysis. The in-cylinder pressure data were analysed and the heat release rates (HRRs) were calculated for various cases.…”

Section: Combustion Model Description and Developmentmentioning

confidence: 99%

An autoignition combustion model for homogeneous charge compression ignition engine cycle simulations

Potrzebowski

Misztal

et al. 2009

Proceedings of the Institution of Mechanical Engineers, Part D:

View full text Add to dashboard Cite

This paper presents an autoignition combustion model, which can be used in conjunction with a one-dimensional gas dynamics and zero-dimensional thermodynamics engine simulation code for homogeneous charge compression ignition (HCCI) engine cycle simulations. The model consists of two parts: the first predicts autoignition timing, based on the integral of the knock delay time, and the second predicts the heat release rate, based on the Watson correlation for diesel engines. The equations for the model were fitted with empirical coefficients derived from experimental results. The experimental data were measured under a number of engine operating conditions for different loads, speeds, and equivalence ratios. The experiments were performed on a Jaguar V6 HCCI engine employing internal exhaust gas residual trapping through cam profile switching and variable valve timing control. It was found that the location of 50 per cent mass fraction burned (MFB) and the peak rate of pressure rise can be chosen as the key parameters charactering the HCCI combustion in engine simulations. The fitted combustion model was then implemented into the V6 engine Ricardo WAVE TM model and validation of its predictive calculations was obtained using a different set of experimental data. The results show that the predicted 50 per cent MFB position is within an average error of 1.84u crank angle (CA) and the predicted peak rate of pressure rise is within an average error of 0.53 bar/deg CA (7.2 per cent).

show abstract

Modelling and Experimental Investigations of Supercharged HCCI Engines

Cited by 19 publications

References 10 publications

A chemical kinetically based ignition delay correlation for iso-octane covering a wide range of conditions including the NTC region

A chemical kinetically based ignition delay correlation for iso-octane covering a wide range of conditions including the NTC region

Effect of injection timing on gasoline homogeneous charge compression ignition particulate emissions

An autoignition combustion model for homogeneous charge compression ignition engine cycle simulations

Contact Info

Product

Resources

About