By Peep Miidla
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For years, the study of the fluid flow inside engines has been mainly supported by experimental tests such as PIV (Particle Image Velocity), LDA (Laser Doppler Anemometry), ICCD cameras, etc. However, these experimental tests are very laborious and expensive. As an alternative solution to experimental techniques, CFD has recently become a useful tool to study the fluid flow inside engines. In the field of engines, CFD is especially useful to design complex components such as combustion chambers, manifolds, injectors and other parameters.
3 Flow tests Figures 5 through 7 are representative frames from the video recordings of the fill process using a vertical alignment of the mould as in the proposed ceramic injection process. 3 s. Because the fill rates varied, the time is shown in these figures in a nondimensional form. 16 cm from the entrance of the distributor. Here, one can see the effects of changing the distributor geometry. In Figure 5 the liquid has just filled the distributor. All of the modified geometries help flatten the leading front, especially Mesh 2.
6. Acknowledgments This work was supported by the Laboratory Directed Research and Development program at Sandia National Laboratories. We would like to thank Dr. Pin Yang, the project principal investigator, for his support of this study. We would also like to thank our Sandia reviewer Daniel Guildenbecher and P. Randall Schunk for their insightful editorial comments. S. Department of Energy's National Nuclear Security Administration under contract DEAC04-94AL85000. 7. References Bach, P. & Hassager, O.
Numerical modelling by Peep Miidla