AN EVALUATION OF THE EFFECTS OF COATING WITH THERMAL BARRIER ON ENGINE PERFORMANCE IN DIESEL ENGINE (original) (raw)
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EFFECT OF THERMAL BARRIER COATING ON PERFORMANCE AND EMISSION CHARACTERISTICS OF A DIESEL ENGINE
The main objective of this present study is to evaluate the performance characteristics of thermal barrier coating in direct injection diesel engine. Combustion chamber of the engine (piston crown, cylinder head and valves) were coated with partially stabilized zirconia of 0.5 mm thickness. Plasma spray coating technique has been used to coat the engine components. Experiments were carried out in a single cylinder, four stroke direct injection diesel engine. The results showed that, the brake thermal efficiency of diesel engine is increased marginally after ceramic coating. Also, the specific energy consumption decreased with engine coating. Carbon monoxide and hydrocarbon emission levels are decreased but in contrast, the oxide of nitrogen emission level was increased due to the higher peak temperature.
Application of Thermal Barrier Coatings in Diesel Engines: a Review
Energy and Power, 2012
A review of research on low heat rejection engines, to incorporate various systems of ceramic materials in intermittent combustion engines, and on the use of ceramics in these engines is presented. The reduction of heat loss from the combustion chamber of diesel engines improves fuel efficiency only by 3 or 4 per cent. Some other gains may be possible from a smaller cooling system, recovery of exhaust energy, and improvements in aerodynamics. The use of thermal barrier coatings (TBCs) to increase the combustion temperature in diesel engines has been pursued for over 20 years. Increased combustion temperature can increase the efficiency of the engine, decrease the CO and (possibly) the NOx emission rate. However, TBCs have not yet met with wide success in diesel engine applications because of various problems associated with the thermomechanical properties of the coating materials. Although, the in-cylinder temperatures that can be achieved by the application of ceramic coatings can be as high as 850-9000C compared to current temperatures of 650-7000C. The increase in the in-cylinder temperatures helped in better release of energy in the case of biodiesel fuels thereby reducing emissions at, almost the same performance as the diesel fuel. The purpose of this paper is to explain the effect of insulation on engine performance, heat transfer characteristics, combustion and emission characteristics. Many researchers have carried out a large number of studieson Low Heat Rejection Engine (LHRE) concept. Some of them are experimental work and many are theoretical studies. In the case of LHR engines almost all theoretical studies predict improved performance but many experimental studies show different picture. This paper analyses the reason for this deviation. The operating conditions, under which the experimental and simulation studies are carried out, have been clearly discussed. The factors, which affect thermal efficiency, combustion, and exhaust emissions in LHR engine, are deduced and their influences discussed.
The effect of thermal barrier coatings on diesel engine performance
Surface and Coatings Technology, 2007
Ceramic coatings hold significant promise in the reduction of wear and abrasion failure in reciprocating and rotary engines for transportation and stationary power. They also have application as thermal barriers to improve the efficiency of the engines, by reducing energy loss and cooling requirements. In this study, the effects of ceramic coating on the performance of the diesel engine were investigated. The research engine was a fourstroke, direct injected, six cylinder, turbo-charged and inter-cooled diesel engine. This engine was tested at different speeds and loads conditions without coating. Then, the combustion chamber surfaces, cylinder head, valves and piston crown faces were coated with ceramic materials. The layers were made of CaZrO 3 and MgZrO 3 and plasma coated onto the base of the NiCrAl bond coat. The ceramic-coated research engine was tested at the same operation conditions as the standard (without coating) engine. The results indicate a reduction in fuel consumption and an improving effective efficiency of the engine.
Use of Thermal Barrier Coating In Diesel Engine
Journal of emerging technologies and innovative research, 2018
The Experimental work is carried out under different loading conditions with same compression ratio on the Research Engine Set-up, single cylinder, four stroke, water cooled, multi fuel variable compression ratio (VCR) diesel engine, with its piston crown, cylinder head and valve top surface coated with Nickel Chromium Aluminum (NiCrAl) as bond coat and Yattria Stabilized Zirconia (YSZ) as a top coat to understand the effect of thermal barrier coating on the performance and emission characteristics in comparison with baseline engine characteristics.YSZ material is taken as the top coat material because of its desirable properties such as the high coefficient of thermal expansion, low conductivity, low heat capacity, high resistance to fatigue stress, creep stress, thermal shock stress, high Poisson ratio and stable at the high temperature condition. Performance characteristics are found out by using I.C. Engine combustion analysis software, smoke and exhaust gas emission is measured...
A review of thermal barrier coating effects on diesel engine performance and components lifetime
In the present paper, a complete literatures review of thermal barrier coating applications in diesel engines is performed to select a proper type and to find coating effects. The coating system has effects on the fuel consumption, the power and the combustion efficiency, pollution contents and the fatigue lifetime of engine components. Usually there are several beneficial influences by applying ceramic layers on the combustion chamber, including the piston, the cylinder head, the cylinder block, intake and exhaust valves by using a plasma thermal spray method. Several disadvantages such as producing nitrogen oxides also exist when a coating system is used. In this article, all effects, advantages and disadvantages of thermal barrier coatings are investigated based on presented articles.
Energy Conversion and Management, 2005
In this study, the effect of insulated combustion chamber surfaces on the turbocharged, direct injection Diesel engine performance was experimentally investigated. Satisfactory performance was obtained with the low heat rejection (LHR) engine. In comparison to a standard Diesel engine, specific fuel consumption was decreased by 6%, and brake thermal efficiency was increased by 2%. It was concluded that the exhaust gas process was the most important source of available energy, which must be recovered via secondary heat recovery devices. The available exhaust gas energy of the LHR engine was 3-27% higher for the LHR engine compared to the standard (STD) Diesel engine. However, it is impossible to recover all the exhaust gas energy in useful work. It is found that the maximum extractable power is less than 47% of the exhaust power.
As per the second law of thermodynamics the efficiency of the engine depends upon the extraction of work against the heat supplied. Minimisation of heat rejection leads to increase the work. Heat rejection takes place through the engine piston, valves and cylinder heads to the surroundings. The aim of the study is to minimise this heat rejection to the surroundings. Heat transfer through the engine parts is minimised by applying the thermal barrier coating materials on the top surface of the engine piston, cylinder heads and valves. In this study an attempt is made to reduce the intensity of thermal and structural stresses by using a layer of the ceramic material, like Yttria stabilized zirconia (YSZ) which has low thermal conductivity, high thermal resistance, chemical inertness, high resistance to erosion, corrosion and high strength was selected as a coating material for engine component. This study present the effect of coating on the piston and the performance of modified four stroke petrol engine and the emission characteristics of the exhaust gas.
Alternative Thermal Barrier coatings for CI engines A Research review
The depletion of supply of fossil fuels and their increased cost has driven the attention towards energy security. The energy security can be partially achieved by improving the efficiency of energy producing equipment’s. Diesel fuels can be used more efficiently in low heat rejection engines (LHR), in which the temperature of combustion chamber is increased by creating thin layer of ceramics, a thermal barrier. Also the use of thermal barrier coatings (TBCs) to increase the combustion temperature in diesel engines has been pursued for over 20 years. Increased combustion temperature can increase the efficiency of the engine, decrease the CO and unburnt Hydrocarbons (UBHC). TBCs have not yet met with wide success in diesel engine applications. To reach the desirable temperature of 850-900°C in the combustion chamber from the current temperature of 350-400°C, a coating with a thickness of order 1mm is required. This paper gives a complete review on the TBCs on CI engines.
Thermal Barrier Coatings on IC-Engines: Review
We take an opportunity to present this report on "THERMAL BARRIER COATINGS ON IC-ENGINES: REVIEW" and put before readers some useful information regarding this paper. In baseline engine, the liner undergoes a severe wear at high temperatures of combustion which results in seizure of the liner. Due to heat losses through the cylinder walls, the thermal efficiency of the engine decreases. Reduction of emissions from diesel engine is becoming increasingly important, because of promulgation of stringent emissions legislation. To increase wear resistance, thermal efficiency, and minimize pollutants in the exhaust of the engine, a thermal barrier and wear resistant coating is applied to inner walls of the cylinder which replaces conventional liner. Thermal barrier Coating (TBC), a new technique used at present scenario. TBC is a thin layer of ceramic coating applied to combustion chamber components, mainly for piston crown, valves, cylinder cover and cylinder walls. By using this technique, the present problems could be solved to some extent. Thermal barrier coatings becoming increasingly important in providing thermal insulation for heat engine components. Thermal insulation reduces incylinder heat transfer from the engine combustion chamber and also components structural temperature. Containment of heat also contributes to increase in cylinder work and offers higher exact temperature for energy recovery. Lower component structural temperature will result in greater durability.
Elsevier, 2017
Industrialization and urbanization reflects in the energy demand consequences of that the world is constantly facing challenges toward the hazardous emissions from various industries and transportation systems. The emissions play a vital role in global warming, ozone layer depletion and imperil to the ecosystem. The survival from adverse effects due to emissions can be significantly controlled by attaining technological advancements in emission reduction. Many researchers are attracted towards engine emission controlled by adopting the metal coating on combustion chamber surfaces. Some of the researchers also attempted with ceramic coating for the components viz piston, engine head etc. The kind of metal coatings acts as thermal barrier, and this thermal insulation decreases the rate of heat transfer from the combustion chamber by restoring the heat in, itself only and controls the exhaust gas emissions. This research paper, details the various trends and innovations about the metal coating in automobile engine application. The results are evitable, in the perception of engine performance enhancement and a significant reduction of engine emission.