Effect of Baffle Structure for the Particle Deposition Characteristics of in the Novel Cavity Upstream of the Pre-swirl Nozzles

Wang, Y.; Li, G. C.; Zhang, W.; He, H. B.

doi:10.47176/jafm.18.9.3322

Effect of Baffle Structure for the Particle Deposition Characteristics of in the Novel Cavity Upstream of the Pre-swirl Nozzles

Document Type : Regular Article

Authors

School of Aero-engine, Shenyang Aerospace University, Shenyang, Liaoning, 110136, China

10.47176/jafm.18.9.3322

Abstract

This study investigates the particle deposition characteristics within a novel cavity featuring a transverse baffle oriented perpendicular to the coolant flow, positioned upstream of the pre-swirl nozzles in the turbine disk cavity. The baffle-induced vortex enhances particle deposition, thereby reducing particle ingress into the turbine disk cavity. Against such a background, a comparative analysis was hereby conducted to delve into the deposition characteristics of particles across four baffle structures. The coolant and particle temperature at the cavity inlet was set at 763.5 K, with a total coolant mass flow rate of 0.2475 kg/s through two impingement holes and an outlet pressure of 2 MPa. The results indicate that the quantity-based deposition rate increases from 66.4% prior to the installation of baffle to 77.2% following the implementation of three baffles. Furthermore, the quality-based deposition rate rises from 14.7% in the absence of baffles to 37.2% following the installation of three baffles. The deposition is primarily concentrated in the target surface area directly opposite the impingement hole, between Baffle 1, and in regions located at 0.5 times the diameter of the impingement hole both upstream and downstream of Baffle 3.

Keywords

Main Subjects

Computational Fluid Dynamics

References

Ai, W. G., Murray, N., Harding, S., & Lewis, S. (2012a). Deposition near film cooling holes on a high pressure turbine vane. Journal of Turbomachinery, 134(4), 041013. https://doi.org/10.1115/1.4003672

Ai, W. G., Murray, N., Harding, S., & Bons, J. P. (2012b). Effect of hole spacing on deposition of fine coal flyash near film cooling holes. Journal of Turbomachinery, 134(4), 041021. https://doi.org/10.1115/1.4003717

Ai, W., & Kuhlman, M. J. (2011). Simulation of coal ash particle deposition experiments. Energy & Fuels, 5(10), 2874-2877. https://doi.org/10.1021/ef101294f

Borello, D., Capobianchi, P., Petris, M. De., & Rispoli, F. (2014). Unsteady RANS analysis of particle deposition in the coolant channel of a gas turbine blade using a non-linear model. Asme Turbo Expo, 45714, V05AT12A035. https://doi.org/ 10.1115/GT2014-26252

Bowen, C. P., Libertowski, N. D., & Mortazavi, M. (2019). Modeling deposition in turbine cooling passages with temperature-dependent adhesion and mesh morphing. Journal of Engineering for Gas Turbines and Power, 141(7), 071010. https://doi.org/10.1115/1.4042287

Brach, R., & Dunn, P. F. (1992). A mathematical model of the impact and adhesion of microspheres. Aerosol Science and Technology, 16(1), 51-64. https://doi.org/10.1080/02786829208959537

Bryant, G. W., & Hurst, H. J. (2003). An empirical method for the prediction of coal ash slag viscosity. Energy Fuels, 17(3), 731-737. https://doi.org/10.1021/ef020165o

Cardwell, N. D., Thole, K. A., & Burd, S. W. (2010). Investigation of sand blocking within impingement and film-cooling holes. Journal of Turbomachinery, 132(2), 021020. https://doi.org/10.1115/1.3106702

Cowan, J. B., Tafti, D. K., & Kohli, A. (2010). Investigation of sand particle deposition and erosion within a short pin fin array. Turbo Expo: Power for Land, Sea, and Air, 43994, 139-149. https://doi.org/10.1115/GT2010-22362

Dowd, C.，Tafti, D., & Yu, K. (2017). Sand transport and deposition in rotating two-passed ribbed duct with coriolis and centrifugal buoyancy forces at Re=100,000. Proceedings of the ASME Turbo Expo, 50817. https://doi.org/10.1115/GT2017-63167

Dritselis, C. D. (2017). Numerical study of particle deposition in a turbulent channel flow with transverse roughness elements on one wall. International Journal of Multiphase Flow, 91, 1-18. https://doi.org/10.1016/j.ijmultiphaseflow.2017.01.004

El-Batsh, H., & Haselbacher, H. (2002). Numerical investigation of the effect of ash particle deposition on the Flow Field Through Turbine Cascades. Power for Land, Sea, and Air, 3610, 1035-1043. https://doi.org/10.1115/GT2002-30600

Felix, D., Stephan, S., & Christian, K. (2017). Modeling particle deposition effects in aircraft engine compressors. Journal of Turbomachinery, 139(5), 051003. https://doi.org/10.1115/1.4035072

Hao, Z., Yang, X., & Feng, Z. (2021). Unsteady simulations of migration and deposition of fly-ash particles in the first-stage turbine of an aero-engine. The Aeronautical Journal, 125(1291), 1566-1586. https://doi.org/10.1017/aer.2021.27

Li, L., Liu, C., Shi, X. Y., Zhu, H., & Li, B. (2019). Numerical investigation on sand particle deposition in a u-bend ribbed internal cooling passage of turbine blade. ASME Turbo Expo, 58585, V02DT47A007. https://doi.org/10.1115/GT2019-90850

Liu, J., Ji, B., Tang, Z., & Song, Q. (2020). Particle movement behavior and capture mechanism in a corrugated cooling channel. Powder Technology, 376, 380-389. https://doi.org/10.1016/j.powtec.2020.08.064

Liu, Z., Diao, W. N., Liu, Z. X., & Zhang, F. (2021). A numerical study of the effect of particle size on particle deposition on turbine vanes and blades. Advances in Mechanical Engineering, 13(5), 1-12. https://doi.org/10.1177/16878140211017812

Singh, S., Tafti, D., Reagle, C., & Delimont, J. (2014). Sand transport in a two pass internal cooling duct with rib turbulators. International Journal of Heat and Fluid Flow, 46(2), 158-167. https://doi.org/10.1016/j.ijheatfluidflow.2014.01.006

Smith, C., Barker, B., Clum, C., & Bons, J. (2010). Deposition in a turbine cascade with combusting flow. Turbo Expo: Power for Land, Sea, and Air, 43994, 743-751. https://doi.org/10.1115/GT2010-22855

Soltani, M., & Ahmadi, G. (1994). On particle adhesion and removal mechanism in turbulent flows. Journal of Adhesion Science and Technology, 8(2), 763-785. https://doi.org/10.1163/156856194X00799

Sun, W. J., Zheng, Y. Q., Gao, Q. H., & Zhang, J. Z. (2024). Numerical simulations on film cooling performance of turbine blade before and after particle deposition. Thermal Science and Engineering Progress, 49, 102504. https://doi.org/10.1016/j.tsep.2024.102504

Walsh, P. M., Sayre, A. N., Loehden, D. O., & Monroe. L. S. (1990). Deposition of bituminous coal ash on an isolated heat exchanger tube: Effects of coal properties on deposit growth. Progress in Energy & Combustion Science, 16(4), 327-345. https://doi.org/10.1016/0360-1285(90)90042-2

Wang, J. J., Lin, Y. J., Xu, W., Li, Q., & Abhijit, D. (2019). Effects of blade roughness on particle deposition in flue gas turbines. Powder Technology, 353, 426-432. https://doi.org/10.1016/j.powtec.2019.05.045

Wylie, S., Bucknell, A., Forsyth, P., & Gillespie, D. R. H. (2017). Reduction in flow parameter resulting from volcanic ash deposition in engine representative cooling passages. Journal of Turbomachinery, 139, 031008. https://doi.org/10.1115/1.4034939

Yang, X., Hao, Z., & Feng, Z. P. (2021). An experimental study on turbine vane Leading-Edge film cooling with deposition. Applied Thermal Engineering, 198, 117447. https://doi.org/10.1016/j.applthermaleng.2021.117447

Zeng, J. W., Wang, F. L., Wang, Y. Q., Wang, Y. B., & Shi, J. (2023). Particle deposition characteristics on turbine blade surface based on critical velocity model. Journal of Physics: Conference Series, 2610(1), 1742-6596. https://doi.org/10.1088/1742-6596/2610/1/012041