Search

In this study, the combustion, performance, and emission results of the HCCI engine under different fuel and engine parameters conditions were examined experimentally and statistically. Engine speed, excess air ratio, and fuel types with different fusel oil concentrations were used as variable parameters. The engine speed was determined as 1000 and 1200 rpm, excess air ratio 1.7 and 2.1, and fusel oil ratio in fuel was determined as 15% and 30%. When the HCCI engine was operated with these input parameters, the effective torque indicated thermal efficiency, maximum pressure increase rate, COV imep , HC, CO, and NOx values were examined. Experiments were carried out in line with the determined experimental series, and the data obtained were analyzed. Optimization has been made to determine the optimum input parameters by inputting the targeted response parameters from the HCCI engine. After the optimization study, it was concluded that the optimum response parameters, engine speed was 1262.44 rpm, excess air ratio was 1.91631, and was obtained by using F30 fuel. Under optimum input parameters, the effective torque is 5.751 Nm, ITE 34.089%, MPRR 7.257%, COV imep 4.009%, CA50 7 ° CA, HC 454.185 ppm, CO 0.0727%, and NO x 0.000169486 ppm. • HCCI combustion phase was controlled by using fusel oil as fuel. • Optimum operating parameters were achieved with F30 fuel while lambda was 1.91631 • Thermal efficiency was determined as 34.089% with F30 at 1262.44 rpm engine speed. • Knocking tendency of the high-octane fusel oil HCCI engine has been improved. [ABSTRACT FROM AUTHOR]

• The highest desirability value of 97.68% was found with created model by using RSM. • Optimum fuel mixtures, injection duration and RPM for HCCI were found using RSM. • Gasoline-naphtha mixture gave better results than diesel-naphtha mixture. In this study, the effects of using naphtha-diesel and naphtha-gasoline fuel mixtures were investigated using experimental and statistical methods on homogeneous charge compression ignition (HCCI) engine performance and emission values. Response Surface Method (RSM) was used as a statistical method. Fifty-two experiments were specified in the experimental set created by the RSM central composite design method, which were carried out under the same conditions. As a result of the experimental study, effective torque, brake-specific fuel consumption (BSFC), CO, HC, and NO emissions values were examined. The experimental results extrapolation equations were obtained with the RSM method, and the contour graphs were drawn. Optimum input parameters were determined to obtain the targeted output parameters. After the optimization, it was seen that the usage of gasoline fuel gave better results than diesel. Among the optimum input parameters, the gasoline ratio was determined as 0.297 %, the injection duration was 11.97 ms, and the engine speed was 1325.21 rpm. Effective torque was 12.79 Nm, BSFC value was 589.79 g/kWh, CO emission value was 0.11 %, HC emission value was 519.86 ppm, and NO emission value was 0 ppm depending on the optimum input parameters. [ABSTRACT FROM AUTHOR]

In this study, the effects of JP-8 military aviation fuel and biodiesel sunflower oil on the performance and emissions of the internal combustion engine were investigated by creating a mixture of fuel in different concentrations. Experimental and statistical methods were used in the study process. All of the experiments were carried out on an experimental setup with a single-cylinder compression-ignition engine at 7.5, 12.5 and 17.5 Nm engine load conditions. A total of 5 different fuels were used, including pure JP-8 fuel, 3 different blended fuels and pure biodiesel fuel. The design of the Response Surface Method, which is used as a statistical method, was carried out with Central Composite Design in the Design Exper 11 program environment. After the created design, 13 different experiments were carried out. With the tests performed, the values of IMEP, BSFC, COV imep , ignition delay, equivalence ratio, exhaust gas temperature, CO, and NO x emission response parameters were determined. Quadratic models were created by performing variance analysis for the response parameters obtained. After the optimization, it was concluded that the engine load should be 14.49 Nm and the JP-8 fuel biodiesel ratio should be 2.47%. In case the internal combustion engine is operated with optimum input parameters, IMEP value is 3.71 bar, BSFC value is 193.46 g/kWh, COV imep value is 5.99 bar, CO value is 724 ppm and NO x value is 168.62 ppm. • BSFC improved as the JP-8 fuel ratio decreased. • Optimum operation was achieved with 14.49 Nm engine load and 2.47% biodiesel. • It has been observed that the increase in biodiesel ratio increases the amount of CO. • The increase in JP-8 fuel ratio resulted in NOx emission improvement. • Maximum IMEP value was obtained in fuel mixture with 50% biodiesel ratio. [ABSTRACT FROM AUTHOR]

To determine the optimum running parameter in HCCI engine is critical for stable and efficient operation, because misfiring, knocking and narrower operating range problems can be seen in HCCI combustion. So in the current study, the influences of valve mechanisms, engine speed, lambda, and inlet air temperature on the performance and exhaust emission of the HCCI engine and its optimization was conducted by response surface method (RSM). The responses were selected as effective torque (ET), brake specific fuel consumption (BSFC), indicated thermal efficiency (ITE), and emissions (UHC, CO, and NO x). The desirability function was used to define an optimum combination of engine operating conditions. The highest desirability function was found as 72% and achieved at 1168.82 rpm engine speed and lambda ratio of 0.971, inlet air temperature of 100.07 °C, and valve lift In 5.5-Ex 3.5 mm. These input variables were recommended as optimum HCCI engine operating conditions. Responses such as ET, BSFC, and ITE, were achieved at this point as 16.4 Nm, 236.936 g/kWh, and 21.55%, respectively. In addition, the optimum exhaust emission values were found to be 442.19 ppm for UHC, 2.42% for CO, and 468.964 ppm for NO x. [Display omitted] • Increasing the intake valve lift from 3.5 to 5.5 mm, the BSFC decreased. • The highest desirability value of 72% was found with created model by using RSM. • Optimum operating conditions of HCCI were found using RSM. • All input variables positively affect effective torque. [ABSTRACT FROM AUTHOR]

To determine the optimum running parameter in HCCI engine is critical for stable and efficient operation, because misfiring, knocking and narrower operating range problems can be seen in HCCI combustion. So in the current study, the influences of valve mechanisms, engine speed, lambda, and inlet air temperature on the performance and exhaust emission of the HCCI engine and its optimization was conducted by response surface method (RSM). The responses were selected as effective torque (ET), brake specific fuel consumption (BSFC), indicated thermal efficiency (ITE), and emissions (UHC, CO, and NO x). The desirability function was used to define an optimum combination of engine operating conditions. The highest desirability function was found as 72% and achieved at 1168.82 rpm engine speed and lambda ratio of 0.971, inlet air temperature of 100.07 °C, and valve lift In 5.5-Ex 3.5 mm. These input variables were recommended as optimum HCCI engine operating conditions. Responses such as ET, BSFC, and ITE, were achieved at this point as 16.4 Nm, 236.936 g/kWh, and 21.55%, respectively. In addition, the optimum exhaust emission values were found to be 442.19 ppm for UHC, 2.42% for CO, and 468.964 ppm for NO x. [Display omitted] • Increasing the intake valve lift from 3.5 to 5.5 mm, the BSFC decreased. • The highest desirability value of 72% was found with created model by using RSM. • Optimum operating conditions of HCCI were found using RSM. • All input variables positively affect effective torque. [ABSTRACT FROM AUTHOR]