Influence of Wake Sweeping Frequency on the Unsteady Flow Characteristics of an Integrated Aggressive Interturbine Duct
Source abstract
Abstract
A dynamic simulation was launched to research the influence of high-pressure turbine (HPT) rotor wake passing frequency on the flow mechanism in an integrated aggressive interturbine duct (AITD). Sweeping rods were adopted to replace the HPT rotors to decouple the influence of its wake from those of other secondary flows. The diameter of the rods (d/s, nondimensionalized by the pitch (s) of the integrated struts at midspan) was 0.10, and their reduced frequency (f) ranged from 0.49 to 1.61. The k–ω SST turbulence model and γ–θ transition model were adopted for the turbulence closure. A 6.3-million-node structured grid was used to meet the grid dependency. Along with increasing f, the intensified circumferential motion of the wake (1) enhances the wake vortex stretching and exhaustion near the hub; (2) promotes the radial inclination of wakes and elongates and narrows the wake vortex band, resulting in increased spacing between the adjacent wake vortices and the weakened vortex interaction. In the high-f cases, the enhanced turbulence intensity in the interval between the adjacent wakes could suppress the separation bubble on LPT-GV in advance, but the elongated and narrowed wake vortices resulted in a substantial reduction in the radial extent and duration of their suppression on the separation bubble. Therefore, the influence of f on the integrated AITD and its parts was bidirectional, and adjusting the sweeping frequency to balance its positive and negative effects could minimize the total loss in the integrated AITD.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Turbomachinery Performance and Optimization · Fluid Dynamics and Turbulent Flows · Combustion and flame dynamics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Key Laboratory of Light-Duty Gas Turbine, Institute of Engineering Thermophysics, C.A.S., Beijing 100190, China
School of Aeronautics and Astronautics, University of Chinese Academy of Sciences, Beijing 100049, China
Department of Aviation Engineering, Civil Aviation Universtiy of China, Tianjian 300300, China
Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, China
Funding
National Natural Science Foundation of China · National Science and Technology Major Project
References (31)
Show source-provided references
1. The Influence of Blade Wakes on the Performance of Inter-turbine Diffusers10.1115/1.2836649 ↗
2. Flow Development through Inter-turbine Diffusers10.1115/1.2841406 ↗
3. Zhang, X., Hu, S., Benner, M., Gostelow, P., and Vlasic, E. (2010, January 12–18). Experimental and Numerical Study on an Inter-turbine Duct. Proceedings of the ASME 2010 International Mechanical Engineering Congress and Exposition, Vancouverm, BC, Canada. Paper No.: IMECE2010-37322.
4. Miller, R.J., Moss, R.W., Ainsworth, R.W., and Harvey, N.W. (2003, January 16–19). The Development of Turbine Exit Flow in a Swan-Necked Inter-stage Diffuser. Proceedings of the ASME Turbo Expo 2003: Power for Land, Sea, and Air, Atlanta, GA, USA. Paper No.: GT2003-38174.10.1115/GT2003-38174 ↗
5. Effects of Area Ratio and Mean Rise Angle on the Aerodynamics of Inter-Turbine Ducts10.1115/1.4039936 ↗
6. Effects of Rising Angle on Upstream Blades and Intermediate Turbine Duct10.1007/s11630-016-0864-9 ↗
7. Numerical Investigation of the Effects of Rising Angle on Intermediate Turbine Duct and Nearby Turbines10.1007/s11630-017-0957-0 ↗
8. Diffusion Rate Influences on Inter-Turbine Diffusers10.1243/0957650971537141 ↗
9. Hu, S., Zhang, Y., Zhang, X., and Vlasic, E. (2010, January 6–10). Influences of Inlet Swirl Distributions on an Inter-Turbine Duct: Part I—Casing Swirl Variation. Proceedings of the ASME Turbo Expo 2011: Power for Land, Sea, and Air, Vancouver, BC, Canada. Paper No.: GT2011-45554.10.1115/GT2011-45554 ↗
10. The Influence of Upstream Flow Angle Variation on Intermediate Turbine Duct
11. Experimental Measurements of Pressure Losses in the Inter-Turbine Duct of a Gas Turbine10.4028/www.scientific.net/AMM.789-790.540 ↗
12. The Effect of Rotor Tip Clearance Size onto the Separated Flow through a Super-Aggressive S-Shaped Intermediate Turbine Duct Downstream of a Transonic Turbine Stage10.1115/1.4004446 ↗
13. Axelsson, L.U., and George, W.K. (2008, January 9–13). Spectral Analysis of the Flow in an Intermediate Turbine Duct. Proceedings of the ASME Turbo Expo 2008: Power for Land, Sea, and Air, Berlin, Germany. Paper No.: GT2008-51340.
14. Göttlich, E., Marn, A., Pecnik, R., Malzacher, F., Schennach, O., and Pirker, H. (2007, January 14–17). The Influence of Blade Tip Gap Variation on the Flow Through an Aggressive S-Shaped Intermediate Turbine Duct Downstream a Transonic Turbine Stage: Part II—Time-Resolved Results and Surface Flow. Proceedings of the ASME Turbo Expo 2007: Power for Land, Sea, and Air, Montreal, QC, Canada. Paper No.: GT2007-28069.10.1115/GT2007-28069 ↗
15. The Effect of Vane Clocking on the Unsteady Flow Field in a One-and-a-Half Stage Transonic Turbine10.1115/1.2777199 ↗
16. Miller, R.J., Moss, R.W., Ainsworth, R.W., and Harvey, N.W. (2004, January 14–17). The Effect of an Upstream Turbine on a Low-Aspect Ratio Vane. Proceedings of the ASME Turbo Expo 2004: Power for Land, Sea, and Air, Vienna, Austria. Paper No.: GT2004-54017.10.1115/GT2004-54017 ↗
17. Marn, A., Goöttlich, E., Cadrecha, D., and Pirker, H.P. (2008, January 9–13). Shorten the Intermediate Turbine Duct Length by Applying an Integrated Concept. Proceedings of the ASME Turbo Expo 2008: Power for Land, Sea, and Air, Berlin, Germany. Paper No.: GT2008-50269.10.1115/GT2008-50269 ↗
18. Spataro, R., Santner, C., Lengani, D., and Göttlich, E. (2012, January 11–15). On the Flow Evolution through a LP Turbine with Wide-Chord Vanes in an S-Shaped Channel. Proceedings of the ASME Turbo Expo 2012: Turbine Technical Conference and Exposition, Copenhagen, Denmark. Paper No.: GT2012-68178.10.1115/GT2012-68178 ↗
19. On the Acoustics of a Turning Mid Turbine Frame with Embedded Design in a Two-Stage Test-Turbine10.1177/0957650915594927 ↗
20. Bader, P., Sanz, W., Spataro, R., and Göttlich, E. (2014, January 16–20). Flow Evolution through a Turning Mid Turbine Frame with Embedded Design. Proceedings of the ASME Turbo Expo 2014: Power for Land, Sea, and Air, Düsseldorf, Germany. Paper No.: GT2014-25009.10.1115/GT2014-25009 ↗
21. Influence of Reynolds Number on the Unsteady Aerodynamics of Integrated Aggressive Intermediate Turbine Duct10.1007/s11630-018-1011-6 ↗
22. Effects of Axial Length and Integrated Design on the Aggressive Intermediate Turbine Duct10.1177/0957650918797450 ↗
23. Effects of Nozzle-Strut Integrated Design Concepton on the Subsonic Turbine Stage Flowfield10.1007/s11630-014-0734-2 ↗
24. Mahallati, A. (2004). Aerodynamics of a Low Pressure Turbine Airfoil Under steady and Periodically Unsteady Conditions. [Ph.D. Thesis, Carleton University].
25. The Effect of Wakes on the Transient Pressure and Velocity Distributions in Turbomachines
26. Stieger, R.D. (2002). The Effects of Wakes on Separating Boundary Layers in Low Pressure Turbines. [Ph.D. Thesis, Cambridge University].
27. Unsteady Flow Mechanism of the integrated Aggressive Inter-turbine Duct in Low Reynolds number condition10.1177/0954410020914786 ↗
28. Impact of Turbulence Intensity on the Unsteady Flow Characteristics of the integrated Aggressive Inter-turbine Duct10.1177/0957650919865127 ↗
29. Lei, Z., Liu, H., Li, G., Gong, J., Zhang, Y., Lu, X., Xu, G., and Zhu, J. (2022). Influence of Wake Intensity on the Unsteady Flow Characteristics of the Integrated Aggressive Interturbine Duct. Appl. Sci., 12.10.3390/app12136655 ↗
30. Numerical and experimental investigation of Y-shaped micromixers with mixing units based on cantor fractal structure for biodiesel applications10.1007/s00542-020-05036-9 ↗
31. Numerical analysis of non-aligned inputs M-type micromixers with different shaped obstacles for biomedical applications10.1177/09544089211051630 ↗