COMBUSTION AND EMISSION CHARACTERISTICS OF DIESEL, B100 AND B20 FUEL ON A THERMAL BARRIER COATING ON PISTON CROWN IN DIRECT INJECTION C.I. ENGINE AT OPTIMUM IOP AND IT

2009 ◽  
Author(s):  
D A Dhananjaya ◽  
P Mohanan ◽  
C V Sudhir
Keyword(s):  
Thermal Barrier Coating ◽  
Direct Injection ◽  
Thermal Barrier ◽  
Emission Characteristics ◽  
Piston Crown ◽  
Barrier Coating

Effect of Thermal Barrier Coating on Piston Crown for Compressed Natural Gas with Direct Injection Engine

2011 ◽  
Vol 52-54 ◽  
pp. 1830-1835 ◽  
Author(s):  
A.J. Helmisyah ◽  
Shahrir Abdullah ◽  
Mariyam Jameelah Ghazali
Keyword(s):  
Heat Flux ◽  
High Temperature ◽  
Natural Gas ◽  
Thermal Stresses ◽  
Direct Injection ◽  
Thermal Barrier ◽  
Compressed Natural Gas ◽  
Piston Crown ◽  
Barrier Coating ◽  
Temperature And Pressure

The top land of a piston normally known as the piston crown is an engine part that is continuously exposed to extreme temperature and pressure during combustion. For a compression ratio level, the compressed natural gas with a direct injection system (CNGDI) typically uses a range of compression ratio between gasoline and diesel engines, producing extremely high temperature and pressure which lead to high thermal stresses. Consequently, the piston crown is exposed to direct combustion due to the vertical movement of the piston, leading to various possible damages of thermal stresses. In contrast to a petrol fuelled internal combustion engine, natural gas combustion creates a dry condition in the combustion chamber, inducing cooling difficulties in the engine. Without good heat transfer, the piston crown materials will soon fail to withstand high temperature and operate effectively. Alternatively, any sort of insulation inside the combustion chamber such as applying ceramic coatings may protect the piston crown surface and affect the overall combustion process, as well as improving the engine performance and the exhaust emissions. By reducing the heat loss of a cylinder bore, a higher thermal efficiency of an engine can also be improved by applying a surface thermal insulation, namely; thermal barrier coating (TBC). Thus, in this study, a ceramic based TBC, yttria partially stabilised zirconia (YPSZ) coating was used to compare with conventional tin coated (Na2SnO3) and uncoated piston crown in terms of heat concentration. Moreover, a set of average value of combustion temperature of a CNGDI engine was selected. Detailed analyses using a finite element analysis (FEA) technique was utilised in order to determine the location of hotspots via distribution profiles of temperature. It was noted that the maximum heat flux of the uncoated piston crown was much higher than that of tin coated and YPSZ coated piston crown. Heat flux value reached about 62% of decrement due to lower conductivity levels of piston crown.

The Effect of Titanium Oxide Content in Piston Coating on the Performance and Emission Characteristics of Bio-Diesel Fuelled C.I. Engine

2013 ◽  
Vol 795 ◽  
pp. 24-28 ◽  
Author(s):  
C.R. Rajashekhar ◽  
C. Umashankar ◽  
T.K. Chandrashekar ◽  
P. Naveen
Keyword(s):  
Titanium Oxide ◽  
Cooling System ◽  
Thermal Barrier ◽  
Emission Characteristics ◽  
Oxide Content ◽  
Weight Percentage ◽  
Performance And Emission ◽  
Piston Crown ◽  
Barrier Coating ◽  
Hc Emissions

Thermal barrier coating has proven to be effective in improving the thermal efficiency and initiation of an effective cooling system of the engine. In the present work the engine piston crown was plasma coated with 150μm thicknss of catalytic ceramic material Alumina-Titanium oxide (Al2O3-TiO2) over a 60μm thickness of NiCrAl bond coat. Available literature on this topic suggest that the particular effect of TiO2 on the over all thermal barrier characteristics have not been established clearly. It was therefore felt that the effect of weight percentage of TiO2 in the Al2O3-TiO2, might influence the performance and emission characteristics of the engine. The TiO2 weight % has been tested at 10% and 15% levels. The engine used was four strokes, single cylinder direct injected diesel engine. The engine was tested with diesel & at 30% Honge bio-diesel with diesel and the results obtained clearly indicate that the specific fuel consumption, CO & HC emissions have come down by increasing the weight % of TiO2.

scholarly journals OBSERVATIONAL ANALYSIS ON RESULT OF YSZ COATED PISTON CROWN ON THE BEHAVIOUR OF A PETROL ENGINE

2021 ◽  
pp. 153-160
Author(s):  
Muhammad Asad Riaz
Keyword(s):  
Thermal Barrier Coating ◽  
Thermal Efficiency ◽  
Mechanical Efficiency ◽  
Yttria Stabilized Zirconia ◽  
Petrol Engine ◽  
Thermal Barrier ◽  
Stabilized Zirconia ◽  
Piston Engine ◽  
Piston Crown ◽  
Barrier Coating

An observational study of thermal barrier coating (TBC) on the working of 4-stroke single cylinder petrol engine was studied. Yttria Stabilized Zirconia (YSZ) used as coating material. YSZ has less thermal conductivity, sustainability under high temperature and pressure. Main aim of TBC is to decrease heat losses to the cooling jacket of the engine. YSZ is coated on the piston crown by Plasma spray method. YSZ coating improves the performance of petrol engine. Experimental study was carried out on 4-stroke single cylinder OHV petrol engine 25‎°C inclined cylinder horizontal shaft engine on performance of ceramic coated engine and compared with baseline engine under different speed. Results show that ceramic coated engine is more effective than conventional engine as brake specific fuel consumption (BSFC) is reduced 2-4% than normal piston engine, brake thermal efficiency (BTE) of modified engine is expanded 4-8% than unmodified engine. Indicated thermal efficiency (ITE) of modified piston engine is increased 5-10% than normal engine. Mechanical efficiency (ME) of the TBC engine is increased 4-10% than standard engine. Volumetric efficiency (VE) of modified engine is decreased 3-9% when compared with standard engine and exhaust gas temperature (EGT) of ceramic coated engine is increased 1-3% than unmodified engine. KEYWORDS: Petrol Engine, Thermal barrier coating (TBC), Yttria Stabilized Zirconia (YSZ). Mechanical Efficiency

scholarly journals The Influence of Thermal Barrier Coating Surface Roughness on Spark-Ignition Engine Performance and Emissions

2012 ◽  
Author(s):  
Silvio Memme ◽  
James S. Wallace
Keyword(s):  
Heat Transfer ◽  
Surface Roughness ◽  
Thermal Barrier Coating ◽  
Surface Finish ◽  
Spark Ignition ◽  
Hydrocarbon Emissions ◽  
Thermal Barrier ◽  
Piston Crown ◽  
Barrier Coating ◽  
Peak Pressures

The separate effects on heat transfer of 1) piston crown surface finish and 2) the use of a metal based thermal barrier coating (MTBC) on the piston crown of a spark ignition (SI) engine were quantified through experimental analysis in a single cylinder CFR engine. Measured engine parameters such as power, fuel consumption, emissions and cylinder pressure were used to identify the effects of the coating and its surface finish. Two piston coatings were tested: a baseline copper coating and a metal-based thermal barrier coating. Each coating was tested at multiple surface finishes. Tests showed that reducing surface roughness of both coatings increased in-cylinder temperature and pressure as a result of reduced heat transfer through the piston crown. For both coatings, this resulted in small improvements (∼3%) in power and fuel consumption, while also having a measurable effect on emissions. Oxides of nitrogen emissions increased while total hydrocarbon emissions generally decreased as a result of polishing. The polished coatings were also seen to increase in-cylinder peak pressures and burn rates. Improvements attributed to the TBC were found to be small, but statistically significant. At an equivalent surface finish, the MTBC-coated piston produced slightly higher power output and peak pressures. Hydrocarbon emissions were also seen to be significantly higher for the MTBC-coated piston due to its porosity. The effectiveness of the coating was found to be highly dependent on surface finish.

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