Air Flow and Rain Water Penetration Analysis on Generator Enclosures Using CFD Simulations

Rain water penetration testing on power generator units requires a number of complicated procedures, requiring many resources. As such, a Computational Fluid Dynamics (CFD) tool, FloEFD for Creo is used to study the water penetration behavior on a OM924 diesel power generator enclosure in a computational environment. First, the three governing equations in fluid dynamics are derived and explained using simple methods. Next, behavior of rain water droplets upon impact is briefly discussed. Air velocity, volumetric flow rate and static pressure drop were measured physically in the OM924 generator enclosure. Then, a CFD model for the OM924 enclosure was developed and validated using the measured data. Using the particle studies option in FloEFD, rain water penetration studies were conducted on the CFD model. The terminal velocity of the droplets was assumed as a function of droplet diameter and the co-efficient of restitution was measured using basic observational methods. In an enclosure, the water penetration can be explained using three methods; free flowing, dripping and splashing. Each of the methods was tested using water droplet diameters that ranged from 0.1 to 2.5 mm. Results verified that the current baffle plate design was capable of preventing water penetration with the exception of those droplets with the smallest diameters

Simulate Multi-Pulse DIesel Injection By Use of Computational Fluid Dynamics (CFD)

The modern society is based on converting energy into many different forms from transportation to electric power. Diesel, gasoline or naturally gas are fuels used by the internal combustion engine to produce different forms of energy. The purpose of this research is to compare different form of Diesel injections that are used in an internal combustion engines. Internal geometry of an injector will be created and computational fluid dynamics modeling process will be used on Star CCM+ software to simulate two different injection methods. The simulation will be compared against single injection and multi-phase injection. Significant reduction of Oxides of nitrogen and soot will be produced in multi- phase injection compared to direct injection