Mixture formation and combustion process of a biodiesel fueled direct injection rotary engine (DIRE) considering injection timing, spark timing and equivalence ratio – CFD study

2020 ◽  
Vol 217 ◽  
pp. 112948 ◽  
Author(s):  
Peter Otchere ◽  
Jianfeng Pan ◽  
Baowei Fan ◽  
Wei Chen ◽  
Yao Lu ◽  
...  
Keyword(s):  
Equivalence Ratio ◽  
Direct Injection ◽  
Combustion Process ◽  
Injection Timing ◽  
Mixture Formation ◽  
Rotary Engine ◽  
Spark Timing

Numerical Investigation on Mixture Formation of Two-Stroke LPG Direct Injection Engine Used as Range Extender for Electric Car

2016 ◽  
Author(s):  
B. Y. Xu ◽  
Y. L. Qi ◽  
C. D. Sun ◽  
J. Z. Ma
Keyword(s):  
High Speed ◽  
Direct Injection ◽  
Power Source ◽  
Calculation Model ◽  
Injection Timing ◽  
Mixture Formation ◽  
Range Extender ◽  
Electric Car ◽  
Spark Timing ◽  
Air Mixing

The two-stroke DI engine has distinct advantages such as high speed, high power density, and simple structure . LPG has a low boiling point and high saturation vapor pressure, which is very helpful in accelerating the fuel-air mixing. Owing to these characteristics and advantages, the two-stroke LPG engine is generally regarded as the preferred power source of the generator unit for extended-range electrical vehicles. The process of mixture formation is numerically simulated after the calculation model is validated by results from optical experiments. The results show that, under conditions of avoidance of fuel short-circuiting, an injection timing of 50° CA ABDC for engine start and warming (2000 rpm), and an 40° CA ABDC for running as the power source of the generator (4800 rpm) are appropriate. Further analysis of the velocity and concentration fields shows that the fresh mixture is locked in the cylinder when the exhaust port is closed (73° CA ABDC) and the homogeneous mixture can be formed at spark timing.

Effects of split ratio of diesel spray injection on mixture formation and combustion process

2021 ◽  
pp. 095440702110143
Author(s):  
Samir Chandra Ray ◽  
Jaeheun Kim ◽  
Scinichi Kakami ◽  
Keiya Nishida ◽  
Yoichi Ogata
Keyword(s):  
High Speed ◽  
Dwell Time ◽  
Equivalence Ratio ◽  
Soot Formation ◽  
Combustion Process ◽  
Air Entrainment ◽  
Diesel Spray ◽  
Injection Timing ◽  
Mixture Formation ◽  
Split Ratio

The effects of the split ratio on the mixture formation and combustion process of a diesel spray in a constant-volume chamber were experimentally investigated. A commercial seven-hole injector was used in this experiment. The effects of the mass-dependent split ratio and dwell time were observed when the total fuel injection was 5.0 mg/hole. Three split ratios were considered: 3:7, 5:5 and 7:3, while the dwell time of 120 µs was fixed for every condition. A laser absorption-scattering technique was adopted to examine the formation of mixtures with regarding to the equivalence ratio. A high-speed video camera was used to observe natural flame luminosity, and a two-colour pyrometer system was employed to evaluate the temperature and soot concentrations in the flame. Among the distribution ratios tested in this study, the 7:3 split ratio exhibited the best performance for the lean mixture formation considering the overall equivalence ratio distribution. The air entrainment wave at the end of injection timing of the first injection caused the fuel near the nozzle to lean at a rapid rate. The soot formation process for the 3:7 and 5:5 split ratios was observed because the second injection fuel caught the flame of the previous injections; this deteriorated the combustion region and influenced soot formation. The result also revealed that for the 7:3 split ratio, accelerated the soot deduction rate to the cycle of soot oxidation during the combustion period.

Effect of injection strategy on the mixture formation and combustion process in a gasoline direct injection rotary engine

Fuel ◽  
2021 ◽  
Vol 304 ◽  
pp. 121428
Author(s):  
Changwei Ji ◽  
Ke Chang ◽  
Shuofeng Wang ◽  
Jinxin Yang ◽  
Du Wang ◽  
...  
Keyword(s):  
Direct Injection ◽  
Combustion Process ◽  
Gasoline Direct Injection ◽  
Mixture Formation ◽  
Injection Strategy ◽  
Rotary Engine

CFD Modelling of the Effects of Injection Timing on the Combustion Process and Emissions in an HSDI Diesel Engine

2012 ◽  
Author(s):  
Raouf Mobasheri ◽  
Zhijun Peng
Keyword(s):  
Diesel Engine ◽  
High Speed ◽  
Cfd Simulation ◽  
Direct Injection ◽  
Combustion Process ◽  
Injection Timing ◽  
Cfd Modelling ◽  
Combustion Modeling ◽  
Pressure Trace ◽  
Hsdi Diesel Engine

High-Speed Direct Injection (HSDI) diesel engines are increasingly used in automotive applications due to superior fuel economy. An advanced CFD simulation has been carried out to analyze the effect of injection timing on combustion process and emission characteristics in a four valves 2.0L Ford diesel engine. The calculation was performed from intake valve closing (IVC) to exhaust valve opening (EVO) at constant speed of 1600 rpm. Since the work was concentrated on the spray injection, mixture formation and combustion process, only a 60° sector mesh was employed for the calculations. For combustion modeling, an improved version of the Coherent Flame Model (ECFM-3Z) has been applied accompanied with advanced models for emission modeling. The results of simulation were compared against experimental data. Good agreement of calculated and measured in-cylinder pressure trace and pollutant formation trends were observed for all investigated operating points. In addition, the results showed that the current CFD model can be applied as a beneficial tool for analyzing the parameters of the diesel combustion under HSDI operating condition.

scholarly journals Analysis of creation and combustion process of hydrogen-air mixtures by optical method in isochoric chamber

2017 ◽  
Vol 170 (3) ◽  
pp. 121-125
Author(s):  
Marek BRZEŻAŃSKI ◽  
Tadeusz PAPUGA ◽  
Łukasz RODAK
Keyword(s):  
Combustion Chamber ◽  
Flame Front ◽  
Dose Distribution ◽  
Optical Method ◽  
Direct Injection ◽  
Combustion Process ◽  
Variable Composition ◽  
Mixture Formation ◽  
Before And After

The article considers the analysis of combustion process of hydrogen-air mixture of variable composition. Direct injection of hydrogen into the isochoric combustion chamber was applied and the mixture formation took place during the combustion process. The influence of the dose distribution of the fuel supplied before and after ignition on the formation of the flame front and the course of the pressure in the isochoric combustion chamber was discussed. The filming process and registration of pressure in the isochoric chamber during research of combustion process was applied.

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