| Citation: | LIU Xiaojing, DING Shuiting, QIU Tian, et al. Analysis of flow entropy generation in aero-engine grate and construction of low entropy generation grate[J]. Journal of Aerospace Power, 2023, 38（9）：2107-2115 doi: 10.13224/j.cnki.jasp.20210730
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The numerical simulation method of grate entropy generation analysis was established, and the accuracy of the method was verified by tests. Then, the flow entropy generation mechanism and the main flow characteristics leading to entropy generation under the changes of inclination angle, tooth top width, tooth height and step height of stepped grate were revealed. On this basis, the grate was optimized and analyzed from the perspective of system entropy generation. The results showed that the relative dissipation intensity in the top region of the grate was large, resulting in strong drag increasing effect of the top vortex in this region, and contributing a lot to improving the local entropy generation of the grate and reducing the system entropy generation. The design goal of enhancing the local entropy generation of the grate and reducing the leakage can be achieved by actively constructing the tooth top vortex (drag increasing vortex); the sealing performance of the optimized stepped grate structure was 24% higher than that of the initial stepped teeth.
| [1] |
Federal Aviation Administration, Department of Transportation. Airworthiness standards, aircraft engines: CFR 14 Part 33[S]. Washington DC: Federal Aviation Administration, 2012: 33.1-33.201.
|
| [2] |
BUNKER R S. Gas turbine heat transfer: ten remaining hot gas path challenges[J]. Journal of Turbomachinery,2007,129(2): 193-201. doi: 10.1115/1.2464142
|
| [3] |
倪萌,朱惠人,裘云,等. 航空发动机涡轮叶片冷却技术综述[J]. 燃气轮机技术,2005,18(4): 25-33. doi: 10.3969/j.issn.1009-2889.2005.04.006
NI Meng,ZHU Huiren,QIU Yun,et al. Overview of the cooling technology of aero-engine turbine blade[J]. Gas Turbine Technology,2005,18(4): 25-33. (in Chinese) doi: 10.3969/j.issn.1009-2889.2005.04.006
|
| [4] |
RHODE D L,DEMKO J A,TRAEGNER U K,et al. Prediction of incompressible flow in labyrinth seals[J]. Journal of Fluids Engineering,1986,108(1): 19-25. doi: 10.1115/1.3242535
|
| [5] |
DEMKO J A,MORRISON G L,RHODE D L. Effect of shaft rotation on the incompressible flow in a labyrinth seal[J]. Journal of Propulsion and Power,1990,6(2): 171-176. doi: 10.2514/3.23240
|
| [6] |
DEMKO J A,MORRISON G L,RHODE D L. The prediction and measurement of incompressible flow in a labyrinth seal[J]. Journal of Engineering for Gas Turbines and Power,1989,111(4): 697-702. doi: 10.1115/1.3240315
|
| [7] |
RHODE D L,SOBOLIK S R. Simulation of subsonic flow through a generic labyrinth seal[J]. Journal of Engineering for Gas Turbines and Power,1986,108(4): 674-680. doi: 10.1115/1.3239964
|
| [8] |
RHODE D L,HIBBS R I. New model for flow over open cavities: Part Ⅰ model development[J]. Journal of Propulsion and Power,1992,8(2): 392-297. doi: 10.2514/3.23490
|
| [9] |
RHODE D L,HIBBS R I. New model for flow over open cavities: Part Ⅱ assessment for seal leakage[J]. Journal of Propulsion and Power,1992,8(2): 398-402. doi: 10.2514/3.23491
|
| [10] |
RHODE D L,HIBBS R I. Clearance effects on corresponding annular and labyrinth seal flow leakage characteristics[J]. Journal of Tribology,1993,115(4): 699-704. doi: 10.1115/1.2921696
|
| [11] |
PRASAD B, SETHU MANAVALAN V, NANJUNDA R N. Computational and experimental investigations of straight-through labyrinth seals[R]. ASME Paper 97-GT-326, 1997.
|
| [12] |
DENECKE J, DULLENKOF K, WITTING S. Experimental investigation of the total temperrature increase and swirl development in rotating labyrinth seals[R]. ASME Paper GT-2005-68677, 2005.
|
| [13] |
STOFF H. Incompressible flow in a labyrinth seal[J]. Journal of Fluid Mechanics,1980,100(4): 817-829. doi: 10.1017/S0022112080001437
|
| [14] |
WILLENBORG K, KIM S, WITTIG S. Effects of Renolds number and pressure ratio on leakage loss and heat transfer in a stepped labyrinth seal[R]. ASME Paper 2001-GT-0123, 2001.
|
| [15] |
MILLWARD J A, EDWARDS M F. Windage heating of air passing through labyrinth seals[J]. Journal of Turbomachinery, 1996, 118(2): 414-419.
|
| [16] |
STOCKER H L, COX D M. Aerodynamic performance of conventional and advanced design labyrinth seals with solid-smooth, abradable, and honeycomb lands[R]. NASA CR-135307, 1977.
|
| [17] |
RHODE D L. Rub-groove width and depth effects on flow predictions for straight-through labyrinth seals[J]. Journal of Tribology,2004,126(4): 781-787. doi: 10.1115/1.1760555
|
| [18] |
KALI C N, MUSTHAFA T. The effects of tooth tip wear and its axial displacement in rub-grooves on leakage and windage heating of labyrinth seals with honeycomb lands[R]. AIAA-2007-5736, 2007
|
| [19] |
KUTZ K J , SPEER T M . Simulation of the secondary air system of aero engines[R]. ASME Paper 92-GT-068, 1992.
|
| [20] |
ZHANG M,YANG J,XU Wanjun,et al. Leakage and rotordynamic performance of a mixed labyrinth seal compared with that of a staggered labyrinth seal[J]. Journal of Mechanical Science and Technology,2017,31(5): 2261-2277. doi: 10.1007/s12206-017-0423-7
|
| [21] |
JIA X,ZHENG Q,JIANG Y,et al. Leakage and rotordynamic performance of T type labyrinth seal[J]. Aerospace Science and Technology,2019,88(5): 22-31.
|
| [22] |
NAYAK K C. Effect of rotation on leakage and windage heating in labyrinth seals with honeycomb lands[J]. Journal of Engineering for Gas Turbines and Power,2020,142(8): 081001.1-081001.11.
|
| [23] |
SUN D, ZHOU M, ZHAO H, et al. Numerical and experimental investigations on windage heating effect of labyrinth seals[J]. Journal of Aerospace Engineering, 2020, 33(5): 4020057.1-4020057.9 .
|
| [24] |
CHARAN N K , DUTTA P. Effect of rub-grooves on leakage and windage heating in straight-through labyrinth seals[J]. Journal of Tribology, 2016, 138(2): 022201.1-022201.11.
|
| [25] |
杨世铭, 陶文铨. 传热学[M]. 4版. 北京: 高等教育出版社, 2006.
|
| [26] |
DAI Lu. Study on the improvement of resistance characteristics in stepped labyrinth seals[D]. Beijing: Beihang University, 2019
|
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