Optimization of compression ratio in LHR engine fueled with nano Al2O3-emulsified biodiesel using RSM and machine learning
These videos have been matched automatically. Contact us if they are not relevant.
These videos have been matched automatically. Contact us if they are not relevant.
View abstract on PubMed
Summary
This summary is machine-generated.Optimizing compression ratio (CR) in a fly ash-coated low heat rejection (LHR) engine using biodiesel blends significantly enhances brake thermal efficiency (BTE) and reduces emissions. The study found CR18 optimal for performance and cleaner combustion.
Area Of Science
- * Combustion Engineering
- * Alternative Fuels
- * Engine Performance Analysis
Background
- * Investigating advanced combustion strategies for diesel engines is crucial for meeting stringent emission regulations.
- * Low Heat Rejection (LHR) engines with thermal barrier coatings offer potential for improved thermal efficiency.
- * Biodiesel blends, particularly those with nano-additives, are explored as sustainable alternatives to conventional diesel fuel.
Purpose Of The Study
- * To evaluate the impact of varying compression ratios (CR) on the performance and emissions of a fly ash-coated LHR diesel engine.
- * To assess the effectiveness of a nano-Al2O3-based emulsified cotton seed biodiesel blend (B20W10Al200) under different CRs.
- * To optimize engine parameters using machine learning and multi-response desirability for enhanced efficiency and reduced emissions.
Main Methods
- * Experimental investigation using Response Surface Methodology (RSM) with brake power (BP) and CR as variables.
- * Analysis of engine performance parameters (BTE, BSFC) and exhaust emissions (NOx, HC, CO, smoke opacity).
- * Application of Extreme Gradient Boosting (XGBoost) and SHapley Additive exPlanations (SHAP) for predictive modeling and factor importance analysis.
Main Results
- * Optimal performance achieved at CR18, yielding maximum BTE (29.03%) and minimum BSFC (0.269 kg kW−1 h−1).
- * Significant reductions observed in CO (0.104%) and smoke opacity (19.3%) at CR18, while CR16 showed lower NOx emissions.
- * XGBoost models demonstrated high predictive accuracy (R² > 0.90); brake power identified as the dominant factor influencing responses.
Conclusions
- * The combination of a thermal barrier-coated LHR engine and nano-emulsified biofuels shows significant potential for cleaner and more efficient combustion.
- * An optimal operating point was determined at BP = 2.49 kW and CR = 18, achieving a composite desirability of 0.751.
- * The study validates the feasibility of using advanced engine technologies and alternative fuels to achieve sustainable energy solutions in compression ignition engines.
These videos have been matched automatically. Contact us if they are not relevant.
These videos have been matched automatically. Contact us if they are not relevant.
Related Concept Videos
An Otto engine is a four-stroke engine that uses a mixture of gasoline and air as the working fuel. The fuel is injected into the cylinder, and the piston is moved completely down so that the cylinder is at maximum volume. By moving the piston up, adiabatic compression takes place. The spark plug ignites the gasoline-air mixture, and the burning fuel adds heat to the system at a constant volume. The heated mixture expands adiabatically and gets further cooled by exhausting heat, and this cyclic...
The mechanical efficiency of a machine is a fundamental concept that describes how effectively a machine can convert input work into output work. According to this concept, the efficiency of a machine is equal to the ratio of the output work to the input work. An ideal machine, meaning a machine that has no energy losses, has an efficiency of one. This implies that the input work and the output work are equal.
However, in reality, no machine can be truly ideal, and all of them experience some...
The internal combustion engine is a heat engine that uses the byproducts of combustion as the working fluid instead of using a heat transfer medium to transfer heat. The combustion is done in a way that produces high-pressure combustion products that can be expanded through a turbine or piston to create work. Internal combustion engines can again be categorized into three kinds: (1) spark ignition gasoline engines, most commonly used in automobiles, (2) compression ignition diesel engines that...
Response Surface Methodology (RSM) is a collection of statistical and mathematical techniques used to develop, improve, and optimize processes. It is particularly valuable when many input variables or factors potentially influence a response variable.
The process of RSM involves several key steps:
Conducting Experiments:
The first step is to conduct experiments by systematically varying the input variables. This is typically done using a specific experimental design, such as a factorial...
Consider the adiabatic compression of an ideal gas in the cylinder of an automobile diesel engine. The gasoline vapor is injected into the cylinder of an automobile engine when the piston is in its expanded position. The temperature, pressure, and volume of the resulting gas-air mixture are 20 °C, 1.00 x 105 N/m2, and 240 cm3 , respectively. The mixture is then compressed adiabatically to a volume of 40 cm3. Note that, in the actual operation of an automobile engine, the compression is not...
The turnover number of an enzyme is the maximum number of substrate molecules it can transform per unit time. Turnover numbers for most enzymes range from 1 to 1000 molecules per second. Catalase has the known highest turnover number, capable of converting up to 2.8×106 molecules of hydrogen peroxide into water and oxygen per second. Lysozyme has the lowest known turnover number of half a molecule per second.
Chymotrypsin is a pancreatic enzyme that breaks down proteins during digestion....