Time filter

Source Type

Hulwan D.B.,Vishwakarma Institute of Technology | Joshi S.V.,Vishwakarma Institute of Technology | Aghav Y.V.,Kirloskar Oil Engines Ltd
SAE Technical Papers | Year: 2013

Potential to reduce the diesel engine emissions of Diesel-Ethanol-Biodiesel blends of high ethanol fraction (DEB blends) has been investigated. Experiments were performed for three DEB blends with oxygen contents of 7.78%, 12.21%, and 14.53% by weight (ethanol content 20%, 30% and 40% by volume) on diesel engines with significantly different engine configurations. The results showed that the HC emissions mainly depend on in cylinder temperatures, and significantly increased for DEB blends at low loads in case of low in cylinder temperature engine. CO emissions are governed by the combination of excess air and in cylinder temperature and oxygen in fuel helped to reduce it when the engine works with richer mixtures. NO emissions are predominantly dependent on excess air compared to the in cylinder temperature and oxygen in fuel has minor effect on it. The effect of oxygen in fuel on smoke reduction is more significant if the engines are working with rich mixtures. However, peak smoke during free acceleration mainly depends on fuel combustion quality, excess air and air fuel mixing ability of the engine rather than the oxygen in fuels and in cylinder temperature. Copyright © 2013 SAE International and Copyright © 2013 SIAT, India. Source

Lakshminarayanan P.A.,Ashok Leyland | Kanase K.,Kirloskar Oil Engines Ltd
SAE Technical Papers | Year: 2011

Parameters like brake mean effective pressure, mean velocity of the piston, hardness of the wear surface, oil film thickness, and surface areas of critical wear parts are similar for all the diesel engines. The mean piston velocity at the rated speed is nearly the same for all the diesel engines. The mechanical efficiency normalized to an arbitrary brake mean effective pressure (bmep) is dependent on the size of the engine. The engine life seems to be proportional directly to the square of a characteristic dimension namely, cylinder bore of the engine and inversely to speed and load factor for engines varying widely in sizes and ratings. Copyright © 2011 SAE International. Source

Pise A.,Direct. of Technical Education | Gokhale N.,Kirloskar Oil Engines Ltd
SAE Technical Papers | Year: 2015

Recently, prediction of cylinder head temperature, using simulation techniques is one of interested tool for engineers. The main aim of this paper work is to predict the temperature field and mechanism of heat transfer prediction along cylinder head of diesel engines. Numerical analysis of conjugate heat transfer (CHT) between cylinder head and coolant was carried out. For the analysis of a six cylinder, four cylinder, three cylinder, and two cylinder stationary diesel engines for different BMEP were taken. Simulation model was prepared and solved using commercial CFD software (STARCCM+ 9.O2) in two steps i.e. flow and Conjugate Heat transfer simulation. Flow simulation predicts flow distribution and its flow velocities along with its variation with respect to cylinder location and channel dimensions. Cylinder head is then used for further analysis where flow and heat transfer is solved simultaneously using CHT (conjugate heat transfer) simulation technique. It predicts temperature distribution of the cylinder head bottom deck, exhaust port, valve bridge region and other critical locations. The input data for heat transfer coefficient values are obtained from analytical methods. This study was performed at various loads to examine the trends in temperatures and provide an input to the estimation of the cylinder head life based on field operating conditions. From these trends lines, correlations of temperature with BMEP are developed. Also efforts extended, to measure the temperature experimentally at rated load at various critical locations by providing templug. These values of temperatures are used to validate the numerical predicated temperatures at rated load. It found good agreements with experimental results. From the predicated temperature field nucleate boiling mechanism is proposed. Temperature prediction helps to locate point wise detection of hot spots along cylinder head; causes thermal stresses, responsible for engine failure. Copyright © 2015 SAE International. Source

Kamat P.,Kirloskar Oil Engines Ltd | Aghav Y.,Kirloskar Oil Engines Ltd | Gokhale N.,Kirloskar Oil Engines Ltd | Helchel V.,Kirloskar Oil Engines Ltd | And 3 more authors.
SAE Technical Papers | Year: 2013

In Direct Injection (DI) diesel engines, combustion gets affected by change in in-cylinder air motion and Fuel injection system characteristics. Computational Fluid Dynamics (CFD) based models give detailed insight into the combustion phenomena. The present work investigates the effect of different combustion chamber geometries and fuel injection system parameters on engine emissions and performance aiming to improve trade-off between NOx and smoke. AVL FIRE CFD software is used in this work. Research engine having 9 liter capacity of heavy duty application has been selected for the study. Seven hole injector is used with mechanical fuel injection system having 1000 bar maximum pressure capability. Inputs required to model complex combustion process in the AVL FIRE are derived from one dimensional engine simulation software AVL BOOST. Experimental data required for making simulation models has been collected using experimental set up compliant to standards ISO 8178 which has been designed for off-road application. A basic reentrant bowl modeled and meshed in the software. After matching the simulation and experimental results of base cavity; flow and local emission generation phenomena have been studied. Various cavity shapes have been designed by maintaining the same cavity volume. Designed cavities simulated in the AVL FIRE. Combustion chamber giving the best results used further to study the effect of fuel injection system parameters. Best results obtained from combustion chamber shape and fuel injection system combination verified experimentally. This study reveals approach of using engine simulation tools in improving fuel economy and engine out emissions. © 2013 SAE International. Source

Mohammed U.A.,Kirloskar Oil Engines Ltd | Gokhale N.,Kirloskar Oil Engines Ltd | Pardeshi S.,College of Engineering, Pune | Gokhale U.,Kirloskar Oil Engines Ltd | Kumar M.N.,Kirloskar Oil Engines Ltd
SAE Technical Papers | Year: 2015

The stringent emission norms and increasing demand for engines with higher power density lead to an extensive investigation of parameters affecting combustion performance. Recent emission norms have forced the engine manufacturers to reduce the Particulate matter (PM) emissions along with other emissions substantially. In order to achieve lo PM emissions the lubrication oil consumption need to be controlled by optimizing piston group design with low liner bore distortion. Bore Distortion is the deviation of actual profile from perfect circular profile at any plane perpendicular to axis of cylinder. Liner bore distortion in engines causes' number of problems like deterioration of piston ring performance, liner-ring conformability issues, high lubricating oil consumption and emissions. Besides traditional prediction of stresses, fatigue life and verification by mechanical testing, the prediction of liner bore distortion is one of today's most important topics in crankcase structure development. Low bore distortion opens up potential for optimized piston group design. The research work focuses on analyzing the parameters affecting liner bore distortion in DI Diesel engines. The study has been carried out on direct injection diesel engine of heavy duty off-highway application with top hung liner. The effects of variation in gasket thickness, liner thickness, number of cylinder head bolts and bolt pre load on liner bore distortion are analyzed successfully. Firstly, a FEA model of crankcase-liner-cylinder head assembly has been developed and the bore distortion results are compared with actual measurements on engine. An extensive analysis has been carried out to study effect of four parameters considered on liner bore distortion. Thus the present research work helps to bridge the gap between understanding the effect of these parameters on liner bore distortion occurrence, lube oil consumption and hence PM emissions. Copyright © 2015 SAE International and Copyright © SAEINDIA. Source

Discover hidden collaborations