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Experimental investigation, optimization and ANN model prediction of a gasoline premixed waste cooking oil fueled HCCI–DI engine

  • G. M. Lionus Leo
  • S. Sekar
  • S. Arivazhagan
Technical Paper
  • 74 Downloads

Abstract

In this study, a Homogeneous charge compression ignition–Direct injection (HCCI–DI) engine was experimentally investigated with waste cooking oil (WCO) biodiesel and its blends with diesel as the DI fuel and gasoline as the premixed fuel. 20% of the gasoline was introduced as the premixed charge and remaining 80% of the fuel was supplied directly into the cylinder at 23° before top dead centre (TDC). The experimental results were compared with DI combustion. Early start of combustion (SOC) was observed from the WCO fueled DI combustion. Lean homogeneous combustion from the gasoline premixed HCCI–DI engine increased the ηbt up to 4.23% compared with DI combustion. NOx emissions decreased up to 11% for the WCO fueled HCCI–DI combustion unlike WCO fueled DI combustion. WCO biodiesel-fueled HCCI–DI combustion emitted 6.67% less HC emissions than diesel-fueled DI combustion. ANN modeling was projected to predict the emission and performance characteristics of the gasoline premixed HCCI–DI engine. Response surface methodology (RSM) was accustomed to optimize the engine operating parameters.

Keywords

HCCI–DI Waste cooking oil Artificial neural network Response surface methodology Gasoline premixing 

List of symbols

Nomenclature

P

Cylinder pressure, bar

m

Number of data set

Pmax

Peak cylinder-pressure, bar

R

Correlation coefficient

R2

Coefficient of determination

V

Volume, m3

Greek symbols

ηbt

Brake thermal efficiency

γ

Adiabatic exponent

θHRRmax

Crank angle corresponding HRRmax

θpmax

Crank angle corresponding Pmax

Subscripts

t

Actual observation

n

Crank angle interval, °CA

o

Predicted output value

Abbreviations

ANN

Artificial neural network

ANOVA

Analysis of variance

ATAC

Active thermo atmosphere combustion

CI

Compression ignition

CO

Carbon monoxide

CZO

Copper-doped zinc oxide

DI

Direct injection

EGR

Exhaust gas recirculation

GDI

Gasoline direct injection

HC

Hydrocarbon

HCCI

Homogeneous charge compression ignition

HRR

Heat release rate

HRRmax

Maximum heat release rate

MAPE

Mean absolute percentage error

NOx

Oxides of nitrogen

NRMSE

Normalized root mean square error

PCCI

Premixed charged compression ignition

PFR

Premixed fuel ratio

RPR

Rate of pressure rise, bar/°CA

RSM

Response surface methodology

RSME

Root mean square error

SFC

Specific fuel consumption

SI

Spark ignition

SOC

Start of combustion

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Copyright information

© The Brazilian Society of Mechanical Sciences and Engineering 2018

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringSt. Joseph’s College of EngineeringChennaiIndia
  2. 2.Department of Mechanical EngineeringVelammal Engineering CollegeChennaiIndia

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