Blowing Ratio Effect on Film Cooling Performance for a Row Holes Installed in Different Trench Configurations

Abstract:

In the present study, a numerical analysis was performed to evaluate the performance of cooling hole embedded in different trenched designs (triangular trench, semi-cylindrical trench and corrugated trench) in improving the film cooling efficiency over a flat plate. These concepts are compared to the rectangular trenched and the traditional cylindrical hole. The commercial software ANSYS CFX 18 was used to conduct a series of required numerical calculations. The centerline and laterally averaged film cooling effectiveness and total pressure loss coefficient for the five cases are analyzed at three blowing ratios, M=0.5, M=1.0 and M=1.5. Results show a uniform coverage is obtained by hole installed in trench. The main result obtained in this paper that the cooling hole with corrugated trench enhance the film cooling effectiveness with less total pressure loss. The main result of this study reveals that the jet installed in the trenches yield a better film cooling effectiveness especially at higher blowing ratios (M≥1).

• Periodical: Diffusion Foundations (Volume 28)
• Pages: 65-75
• DOI: https://doi.org/10.4028/www.scientific.net/DF.28.65
• Online since: December 2020
• Authors: Khadidja Boualem*, Abbes Azzi
• Keywords: Anti CRV, Film Cooling Efficiency, Total Pressure Loss, Trenched Cooling Hole

References

[1] Ligrani, P. M., Cirello, S., and Bishop, D. T., Heat Transfer, Adiabatic Effectiveness, and Injectant Distributions Downstream of a Single Row and Two Staggered Rows of Compound Angle Film-Cooling Holes, Journal of Turbomachinery, vol. 114, no. 4, pp.687-700, (1992).

DOI: 10.1115/1.2928021

[2] Ligrani P. M., J. M. Wigle, S. Ciriello, and S. M. Jackson, Film-Cooling from Holes with Compound Angle Orientations: Part 1: Results Downstream of Two Staggered Rows of Holes with 3D Spanwise Spacing, Journal of Heat Transfer, vol. 116, pp.341-352, (1994).

DOI: 10.1115/1.2911406

[3] Ligrani P.M., J.M. Wigle, and S.M. Jackson, Film-Cooling from Holes with Compound Angle Orientations: Part 2: Results Downstream of a Single Row of Holes with 6DSpanwise Spacing, Journal of Heat Transfer, vol. 116, pp.353-362, (1994).

DOI: 10.1115/1.2911407

[4] Jubran, B. A., Correlation and Prediction of Film Cooling from Two Rows of Holes, Journal of Turbomachinery, vol. 111, no. 4, pp.502-509, (1988).

DOI: 10.1115/1.3262300

[5] Rhee, D.H., Lee, Y.S., and Cho, H.H., Film Cooling Effectiveness and Heat Transfer of Rectangular-shaped Film Cooling Holes, ASME Paper GT2002, pp.1-12, (2002).

DOI: 10.1115/gt2002-30168

[6] Benabed, M., Azzi, A., and Jubran, B. A., Numerical investigation of the influence of incidence angle on asymmetrical turbine blade model showerhead film cooling effectiveness, Journal of Heat Mass Transfer, vol. 46, no. 8, p.811–819, (2010).

DOI: 10.1007/s00231-010-0644-0

[7] Qin, M., Ju, D.Y., and Oba, R., Investigation of the influence of incidence angle on the process capability of water cavitations peening, Surface & Coatings Technology, vol. 201, no. 3, pp.1409-1413, (2006).

DOI: 10.1016/j.surfcoat.2006.02.006

[8] Kebir, F., and Khorsi, A., Numerical approach at flat plate for predicting the film cooling effectiveness part a: effect blowing ratio, Diffusion Foundations, vol. 16, pp.30-44, (2018).

DOI: 10.4028/www.scientific.net/df.16.30

[9] Kebir, F., and Khorsi, A., Numerical Approach at Flat Plate for Predicting the Film Cooling Effectiveness Part B: Effect Injection Angle, Diffusion Foundations, vol. 16, pp.57-71, (2018).

DOI: 10.4028/www.scientific.net/df.16.57

[10] Kebir, F., and Azzi, A., Study of wave number effect in wavy plate for improving the film cooling effectiveness at spanwise direction, Numerical Heat Transfer, Part A: Applications, vol. 73, pp.408-427, (2019).

DOI: 10.1080/10407782.2018.1444870

[11] Korsi, A., and Azzi, A., Computation film cooling from three different holes geometries, Mechanika, vol. 6, no. 86, p.32–37, (2010).

[12] Dhungel, A., Lu, Y., and Phillips, W., Film Cooling From a Row of Holes Supplemented With Antivortex Holes, Journal of Turbomachinery, vol. 13, no. 2, pp.1-10, (2009).

DOI: 10.1115/1.2950059

[13] Kouchih, F., Boualem, K., Grine, M., Azzi, A., The Effect of an Upstream Dune-Shaped Shells on Forward and Backward Injection Hole Film Cooling, J. Heat Transfer, vo.142, (2020).

DOI: 10.1115/1.4047643

[14] Kebir, F., Computational Analysis on Gas Turbine Blade by Hole Modified for Optimization the Effectiveness, Diffusion Foundations, vol. 26, pp.157-169, (2020).

DOI: 10.4028/www.scientific.net/df.26.157

[15] Baheri Islami, S., Alavi-Tabrizi, S. P., Jubran, B. A., and Esmaeilzadeh, E., Influence of Trenched Shaped Holes on Turbine Blade Leading Edge Film Cooling, Heat Transfer Engineering, vol. 31, no. 10, p.889–906, (2010).

DOI: 10.1080/01457630903550317

[16] Khalatov, A.A., Borisov, I.I., Dashevskiy, Yu. Ya., Kovalenko, A.S., and Shevtsov, S.V., Flat plate film cooling from a single-row inclined holes embedded in a trench: effect of external turbulence and flow acceleration, Thermophysics and Aeromechanics, vol 20, no 6, p.713–719, (2013).

DOI: 10.1134/s0869864313060085

[17] Pakhomov, M.A., Terekhov1, V.I., Khalatov, A.A., and Borisov, I.I., Film cooling effectiveness with injection through circular holes embedded in a transverse trench, Thermophysics and Aeromechanics, vol. 22, no. 3, pp., 329-338, (2015).

DOI: 10.1134/s0869864315030075

[18] Khalatov, A.A., Panchenko, N. A., Borisov, I. I., and Severina, V.V., Numerical Simulation of Film Cooling with a Coolant Supplied Through Holes in a Trench, Journal of Engineering Physics and Thermophysics, vol 90, no 3, p.637–643, (2017).

DOI: 10.1007/s10891-017-1610-1

[19] He, W., Denga, Q., Zhoua, W., Gaoa, T., Feng, Z., Film cooling and aerodynamic performances of a turbine nozzle guide vane with trenched cooling holes, Applied Thermal Engineering, vol. 150, p.150–163, (2019).

DOI: 10.1016/j.applthermaleng.2019.01.002

[20] Wanga, C., Suna, X., Zhang, J., Uncertainty analysis of trench film cooling on flat plate, Applied Thermal Engineering, vol. 156, p.562–575, (2019).

DOI: 10.1016/j.applthermaleng.2019.04.099

[21] Hou, R., Wen, F., Wang, S., Luo, Y., Tang, X., Large eddy simulation of the trenched film cooling hole with different compound angles and coolant inflow orientation effects, Applied Thermal Engineering, vol. 163, (2019).

DOI: 10.1016/j.applthermaleng.2019.114397

[22] Sinha, A. K., Bogard, D. G., and Crawford, M. E., Film- Cooling Effectiveness Downstream of a Single Row of Holes with Variable Density Ratio, Trans. ASME Journal of Turbomachinery, vol. 113, no. 3, p.442–449, (1991).

DOI: 10.1115/1.2927894

[23] Yakhot, V., Orszag, S.A., Thangam, S., Gatski, T.B., and Speziale, C.G., Development of turbulence models for shear flows by a double expansion technique, Physics of Fluids A, vol. 4, no. 7, pp.1510-1520, (1992).

DOI: 10.1063/1.858424

[24] Wilfert, G., and L. Fottner. 1994. The aerodynamic mixing effect of discrete cooling jets with mainstream flow on a highly loaded turbine blade., In Proc., Int. Gas Turbine and Aeroengine Congress and Exposition, V001T01A084. New York: ASME.

DOI: 10.1115/94-gt-235