Fluid flow models developed for pipe flow in gasoline port fuel injection system with different number of injectors working under steady state condition was simulated in this study using FLOWMASTER Software. Using existing equations, theoretical analysis were computed for the same flow parameters and results obtained for each parameter for both the simulation and theoretical approach were compared accordingly. Results obtained for the theoretical approach and that of simulation had not shown much correlation due to the assumptions and computational errors. The pipe flow was simulated under steady state condition and the inlet pressure flowing across the circular pipe was observed to increase per unit time while fluctuations characterised by sinusoidal pattern were observed on the plot of total pressure at bends against time. The normal pressure while flowing along the pipe duct increased proportionally with the pipe length but suddenly experienced a decline and pick-up again as it encountered bends. The mass flow rate of gasoline was observed to increase gradually as the simulation time progressed. For the three simulated outcomes, decrease were observed as the flow approached bends along the circular pipe. Hence, the use of FLOWMASTER software in Computational Fluid Dynamics (CFDs) helped in predicting flow characteristics along the rail pipes in gasoline port fuel injection system.
The transmission of motion from one gear to the other in a planetary gear train usually result in unwanted conditions such as vibration due to poor gear assembly, high contact forces, high rotation speeds etc. The vibrating effect of the gear can result in higher or lower frequency response which may damage the gear or offer safe working condition. Using SOLIDWORKS 2018 version for the modelling, SimulationXpress was used to conduct frequency analysis on input shaft/carrier of a planetary gear train to understand its behaviour at different mode shapes during vibration. Results obtain from the input shaft/carrier frequency analysis showed natural frequency values of 1922.4Hz, 1922.8Hz, 2101Hz, 2183.1Hz and 2185.3Hz for mode shape 1-5. Geometry of the input shaft/carrier appeared differently at each mode number, resulting in frequency responses characterised by different modal shapes. This also led to gradual increase in the natural frequency of the input shaft/carrier at increasing mode no, consequently causing deflection on the mode shapes of the input shaft/carrier model. Hence, vibration should be reduced to the lowest limit of tolerance for minimum deflections and longevity of the input shaft/carrier and planetary gear components.
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