NomeNclature INtroductIoNDiesel engines will continue to be the prime-movers of future battle tanks owing to their fuel economy, high torque and ease of maintenance. Common rail direct injection (CR DI) technology with electronic engine control is likely to overcome the challenges imposed by extreme weather conditions and other hazards like zero visibility dusty terrains and will replace present mechanical fuel injection systems in the battle tank. Modelling of a turbocharger is of interest to the engine designer as the work developed by the turbine can be used to drive a compressor coupled to it. This positively influences charge air density and engine power to weight ratio. Variable geometry turbocharger (VGT) additionally has a controllable set of nozzles which through a ring is normally electropneumatically actuated by the engine control unit (ECU). This additional degree of freedom offers efficient matching of the effective turbine area for a wide range of engine mass flow rates. At the design point, nozzle less turbine is generally 7 per cent less efficient than the turbine with nozzle blades whereas at off design points it performs better than turbine with nozzle blades 1 . Using VGT, this loss in efficiency can be reduced by matching incidence gas flow angle at the turbine rotor entry to the optimum incidence angle thereby reducing incidence loss which is a major loss at off design operation as proven by experimental studies in 2 . Hence, a CR DI engine with electronic control and VGT offers the advantage of closely matched engine-turbocharger coupled operation at all operating points. But multivariable nature of this control problem makes the system complex and makes control strategies and controller design complicated. In the conventional approach, a map of boost pressure as a function of engine speed and throttle Simulation of a diesel engine with Variable Geometry turbocharger and Parametric Study of Variable Vane Position on engine PerformanceAnand Mammen Thomas #,* , Jensen Samuel J. Modelling of a turbocharger is of interest to the engine designer as the work developed by the turbine can be used to drive a compressor coupled to it. This positively influences charge air density and engine power to weight ratio. Variable geometry turbocharger (VGT) additionally has a controllable nozzle ring which is normally electropneumatically actuated. This additional degree of freedom offers efficient matching of the effective turbine area for a wide range of engine mass flow rates. Closing of the nozzle ring (vanes tangential to rotor) result in more turbine work and deliver higher boost pressure but it also increases the back pressure on the engine induced by reduced turbine effective area. This adversely affects the net engine torque as the pumping work required increases. Hence, the optimum vane position for a given engine operating point is to be found through simulations or experimentation. A thermodynamic simulation model of a 2.2l 4 cylinder diesel engine was developed for investigation of different con...
<p>In the design of AFVs, study of structures subjected to land mine blast is important. Generally, blast related experimental studies are very time consuming and costly. A simple first cut alternative is finite element modelling and analysis. Here, modelling of mine and simulating the blast effect involves large number of mesh elements, which makes the model computationally intensive and time consuming. Hence, instead of using full scale model for analysis, a suitable scaled down model would reduce analysis time and leads to a faster DOE studies. A proper scaling mechanism is to be evolved in order to get accurate results. Discusses about the scaling of plate subjected to mine blast using dimensional analysis approach. The out-of-plane surface deformation, including velocity fields during the blast loading are compared between the scaled and unscaled plate.</p>
The present work is focused on the finite element analysis carried out on special water filter used in the marine application developed by CVRDE. This paper describes specifically on various type of analysis such as structural, shock analysis and modal analysis for the special water filter. The analysis is carried out using finite element method and compared it with the test results. It is observed that the shock test and sine sweep vibration test carried out is in line with the predicted finite element simulation. The filter assembly is designed in such a way that the natural frequency is away from resonance frequency. Thus, the special water filter has been validated through analysis using the finite element technique which help reduce the repeated testing of all the filters.
In naval applications generally, the pleated discrete pore non-woven layer filter element is used. Filters used for such applications require maximized filtration rate, lower pressure drop, higher permeability, effective pore size distribution and good filtration efficiency. In other most common wire mesh filter element types, the geometric parameters are well defined and can easily be modelled. In the case of non-woven layer filter elements the pores are arranged in a randomly distributed manner and the modelling becomes difficult. In this present study a new approach was contemplated for modelling the same. The fluid flow through the filter element is by percolation phenomenon. Using Darcy’s law approach, the pressure drop across the filter element for different flow rates, were found analytically by considering the flow resistance in axial, radial and circumferential directions. The theoretical prediction made by CFD analysis is correlated with actual model behaviour and a good degree of correlation is obtained which shows the efficacy of this method for wider use in similar application.
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