Fig. 1. Experimental setups used for validating CFD model
Fig. 2. Comparison of pressure histories between experimental and CFD results inside the low pressure section (Ms =1.1)
Fig. 3. Comparison of pressure histories between experimental and CFD impulse waves at different Ms (r=2D)
Fig. 4. Comparison between experimental and CFD density contours (Ms=1.1)
Fig. 5. Simplified computation domain and boundary conditions
Fig. 6. Pressure histories of impulse wave at locations with different angles at a specific radius of r=2D with different baffle length
Fig. 7. Density contours of impulse waves with the length of baffle plate
Fig. 8. Pressure histories of impulse wave with different baffle angle at different specific radiuses
Fig. 9. Generation and propagation of impulse wave from a tunnel exit with a baffle plate
Table 1. Numerical schemes
References
- Kim, H. D., Setoguchi, T., Kashimura, H. and Raghunathan, R., 2001, "Augmentation of the Magnitude of the Impulse Wave Discharging from a Tube, IMechE Part C: Journal of Mechanical Engineering Science, Vol. 215(2), pp.191-199. https://doi.org/10.1243/0954406011520616
- Kim, H. D. and Setoguchi, T., 1999, "Study of the Discharge of Weak Shocks from an Open End of a Duct," Journal of Sound and Vibration, Vol. 226(5), pp.1011-1028. https://doi.org/10.1006/jsvi.1999.2376
- Raghunathan, R., Kim, H. D. and Setoguchi, T., 2002, "Aerodynamics of High-Speed Railway Train," Progress in Aerospace Science, Vol. 38(6), pp.469-514. https://doi.org/10.1016/S0376-0421(02)00029-5
- Kim, H. D., Setoguchi, T. and Matsuo, K., 1997, "Reduction of Impulse Noise Caused by Unsteady Compression Wave," JSME International Journal, Vol. 40(20), pp.223-229. https://doi.org/10.1299/jsmeb.40.223
- Setoguchi, T., Takao, M., Yu, S. and Hirahara, H., 1996, "Numerical Simulation of a Negative Impulse Wave," Journal of Thermal science, Vol. 5(3), pp.150-157.
- Norris, A. N. and Sheng, I. C., 1989, "Acoustic Radiation from a Circular Pipe with an Infinite Flange," Journal of Sound and Vibration, Vol. 135(1), pp.85-93. https://doi.org/10.1016/0022-460X(89)90756-6
- Hieke, M., Kaltenbach, H. J. and Tielkes, T., 2009, "Prediction of Micro-Pressure Wave Emissions from High-Speed Railway Tunnels," 13th International Symposium on Aerodynamics and Ventilation of Vehicle Tunnels, New Brunswick, New Jersey, pp.487-499.