Effects of valve lift on the combustion and emissions of a HCCI gasoline engine

Çınar, Can; Uyumaz, Ahmet; Solmaz, Hamit; Topgül, Tolga

doi:10.1016/j.enconman.2015.01.072

Cited by 68 publications

(23 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, increased injected fuel allows decreasing in the air to fuel ratio with the increase of engine load. Thus, it causes higher in-cylinder pressure and temperature and NO formation [38][39][40][41][42][43][44][45][46][47][48][49][50][51][52][53][54]. It was found that the lowest NO x emission was measured as 300.95 ppm with D100 at 15.00 Nm engine load.…”

Section: Resultsmentioning

confidence: 99%

Comparison of the combustion, performance, and emission characteristics of inedible Crambe abyssinica biodiesel and edible hazelnut, corn, soybean, sunflower, and canola biodiesels

Uyaroğlu¹,

Uyumaz

Çelıkten

2017

Env Prog and Sustain Energy

Self Cite

View full text Add to dashboard Cite

In this study, the effects of hazelnut oil–diesel (H30), corn oil–diesel (C30), soybean oil–diesel (S30), sunflower oil–diesel (Su30), canola oil–diesel (Ca30) and Crambe abyssinica oil–diesel (Cr30) and diesel fuel blends were investigated on combustion characteristics, engine performance and NOx, CO, HC, and soot emissions. A single cylinder, four stroke, direct injection diesel engine was operated at maximum brake torque engine speed of 2200 rpm and 7.5, 11.25, 15, and 18.75 Nm engine loads. Test results showed that thermal efficiency decreased by about 3.1, 6.44, 7.08, 7.40, 8.76, and 11.68% with H30, C30, S30, Su30, Ca30, and Cr30 compared to D100 at full load, respectively. There was no big differences on cylinder pressure between test fuels. However, higher heat release rate was obtained with D100 according to fuel blends due to higher calorific value of D100. Test results also showed that HC, CO, and soot emissions decreased with biodiesel fuel blends compared to diesel fuel for all engine loads while NOx emissions increased. At full load, HC and CO decreased by about 81.2 and 21.5%, respectively, with C30 compared to diesel. Similarly, soot reduced 51.3% with Su30 compared to diesel at the same engine load. However, NOx increased 15.8% with C30 according to diesel at full load. It was concluded that biodiesel–diesel fuel blends can be used efficiently in a diesel engine. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 1438–1447, 2018

show abstract

Section: Resultsmentioning

confidence: 99%

Comparison of the combustion, performance, and emission characteristics of inedible Crambe abyssinica biodiesel and edible hazelnut, corn, soybean, sunflower, and canola biodiesels

Uyaroğlu¹,

Uyumaz

Çelıkten

2017

Env Prog and Sustain Energy

Self Cite

View full text Add to dashboard Cite

show abstract

“…Besides, the operating of HCCI engines is restricted by knocking and misfiring [13][14][15]. Several studies has been performed by many researchers to eliminate these disadvantages and various methods have been proposed like EGR (exhaust gas recirculation) [16][17][18], changing valve lift [19,20], changing inlet air temperature [21,22], changing compression ratio [23], using different fuels [24][25][26]. HCCI engines have also fuel flexibility such as diesel, gasoline, natural gas and some alcohols [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Combustion, performance and emission caracteristics of a HCCI engine fuelled with n-butanol/n-heptane blends

Aydoğan

Calam

2020

International Journal of Automotive Engineering and Technologies

View full text Add to dashboard Cite

Published by Editorial Board Members of IJAET © This article is distributed by Turk Journal Park System under the CC 4.0 terms and conditions.Homegeneous charge compression ignition (HCCI) combustion can achieve very low NOx and soot emissions but knocking and misfiring restrict the operating range of this kind of engines. In this work, n-butanol which has low reactivity and high volatility blended with n-heptane that choosen as reference fuel in this study with various rates (25 vol% and 50 vol%). The experiments performed at various engine speeds (800-1800) and lambda (λ=1.6-2.95) at full load and 60 o C inlet air temperature. the parameters such as in-cylinder pressure, heat release rate, CA10, ringing intensity, thermal efficiency, brake torque, power output, specific fuel consumption, and HC and CO emissions were determined. The results showed that both in-cylinder pressure and heat release rate decreased with increasing lambda. Increasing amount of n-butanol in the charge mixture resulted a decrease both in-cylinder pressure and heat release rate. nbutanol also provided retarded combustion phasing and increased CA10. Ringing intensity decreased with increasing both lambda and n-butanol content in the mixture. Thermal efficiency increased with n-butanol. HC and CO emissions increased with increasing lambda. HC and CO emissions increased with increasing amount of n-butanol in the charge mixture. Operating range of HCCI engine was expanded with n-butanol in both knocking and misfiring zones.

show abstract

“…Changes in the in-cylinder flow field are created by changes in the shape of manifold, valve timing, and type of valve motion. Strategies for optimizing inlet and exhaust valve timings and some of developments in the application of VVT to diesel or gasoline engines can be obtained in some researches [2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…They showed that fuel economy and cyclic dispersion improves by using the low-intake valve lift. Can Cinar et al [6] tested the effects of valve lift, intake air temperature, and air/fuel ratio on combustion and emission in an HCCI gasoline engine. Their results showed that at low-lift cam, HCCI combustion mode extends.…”

Section: Introductionmentioning

confidence: 99%

Reduction of pollutant emissions by developing a variable valve timing system in a direct injection diesel engine using computational fluid dynamics modeling

Ashkezari

Nezhad

Farahat

2016

Env Prog and Sustain Energy

View full text Add to dashboard Cite

In this work, the fluid flow in a direct injection compression ignition engine and its effects on performance and pollutant emissions are studied by using computational fluid dynamics simulation through developing of variable valve timing system by combination of the optimum valve lifting and late inlet valve closing (LIVC) strategies. For this purpose, an improved version of ECFM‐3Z combustion model coupled with advanced models for NOx and soot formation was used to predict and simulate the combustion characteristics. First, the calculated in‐cylinder pressure, heat‐release rate, soot, and NOx were compared with experimental data and good agreement was obtained. To improve the performance and reduce the emission, various angles of LIVC and different types of valve lifting were compared with those of engine basic mode, and then optimum inlet valve closing (IVC) angle and optimum valve lift were determined. Results showed that in constant opening duration of the inlet valve, the volumetric efficiency increases by increasing the valve lift. In addition, the 25% increase of valve lift relative to basic mode along with optimized IVC angle of 70° crack angle after bottom dead center improves volumetric efficiency and brake power, and reduces considerably soot, NOx, and brake‐specific fuel consumption, while CO emission is increased slightly. © 2016 American Institute of Chemical Engineers Environ Prog, 35: 1430–1440, 2016

show abstract

Effects of valve lift on the combustion and emissions of a HCCI gasoline engine

Cited by 68 publications

References 32 publications

Comparison of the combustion, performance, and emission characteristics of inedible Crambe abyssinica biodiesel and edible hazelnut, corn, soybean, sunflower, and canola biodiesels

Comparison of the combustion, performance, and emission characteristics of inedible Crambe abyssinica biodiesel and edible hazelnut, corn, soybean, sunflower, and canola biodiesels

Combustion, performance and emission caracteristics of a HCCI engine fuelled with n-butanol/n-heptane blends

Reduction of pollutant emissions by developing a variable valve timing system in a direct injection diesel engine using computational fluid dynamics modeling

Contact Info

Product

Resources

About