Kurniawan et al, investigated the effect of the piston crown inside the combustion chamber of a 4-stroke direct injection automotive engine under the motoring condition. The results obtained showed reasonably good agreement with the measured data given in the literature. They also compared the volumetric efficiency of the modeled helical manifold. The predicted CFD results of mean swirl velocity of the engine at different locations inside the combustion chamber at the end of compression stroke were compared with experimental results available in the literature. The flow characteristics of these engine manifolds are examined under transient conditions using Computational Fluid Dynamics code STAR CD. Benny and Ganesan studied on the effect of helical, spiral, and helical-spiral combination manifold configuration on air motion and turbulence inside the cylinder of a Direct Injection (DI) diesel engine motored at 3000 rpm. ![]() Comparisons of the numerical predictions with the experimental data indicated that the mean flow features are accurately predicted in many parts of the flow field. The three-dimensional velocity and turbulence fields in the port and cylinder were simulated. The port was of generic design with a straight centerline. Chen et al, combined experimental and computational study of the steady flow through an internal combustion engine inlet port. When illustrating these methods side-by-side, they describe the relative strengths and weaknesses of each approach. ![]() ![]() Robert et al, investigated two important, common fluid flow patterns from CFD simulations Fluent, namely, swirl and tumble motion typical of automotive engines and visualize swirl and tumble flow using three different flow visualization techniques: direct, geometric, and texture-based. Many researchers have studied on Intake manifold distribution of diesel engine aspects that constitute a premise to the modeling and simulation of intake manifold with Exhaust Gas Recirculation (EGR) and intake port alone at different valve lift in the past. Also mapping the total pressure distribution at the manifold, port and valve is an effective method for analyzing computational prediction of the flow separation process in the region upstream of the valve stem and in the vicinity of the valve seat, because the total pressure is influenced by the mean. There is a need for computational fluid dynamics (CFD) method (numerical method), which could estimate the volumetric efficiency of the engine during the design stage itself, without undergoing any time consuming experiments. Achieving this by means of experimental methods would cost time and money. Hence, configuration of manifold geometry becomes an important criterion for the engine design. The design becomes more complex in case of a multicylinder engine as air has to be distributed equally in all the cylinders. To maximize the mass of air inducted into the cylinder during the suction stroke, the intake manifold design, which plays an important role, has to be optimized. Introduction In today’s world, major objectives of engine designers are to achieve the twin goals of best performance and lowest possible emission levels. However, volumetric efficiency was observed to be higher for helical manifold.ġ. It was concluded that spiral and helical-spiral manifold creates higher swirl than normal inlet manifold. The overall flow field inside the intake manifold and various quantities, such as swirl and tumble ratios were examined for all three types of manifolds. The governing equations for unsteady, three-dimensional, compressible, turbulent flow are solved with the two equation RNG k-ε model to consider the complexity of the geometry and fluid motion. In this project work, the internal flow characteristic in the intake manifold of a diesel engine is investigated computationally for the different intake manifold (Helical, Spiral and Helical-Spiral) configurations. ![]() Hence the flow phenomenon inside the intake manifold should be fully understood in order to consider the current requirement of higher engine efficiency and lower emission. Air motion inside the intake manifold is one of the important factors, which govern the engine performance and emission of multi-cylinder diesel engines.
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