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بررسی تاثیر الگوی پاشش اسپری سوخت بر تبخیر قطرات در لوله پیش مخلوط توربین گاز | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 6، دوره 52، شماره 4، تیر 1399، صفحه 833-846 اصل مقاله (1.88 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2018.14433.5859 | ||
| نویسندگان | ||
| احمد کاظمی فرد1؛ حسن خالقی* 2؛ رضا ابراهیمی3 | ||
| 1دانشجوی دکتری، مهندسی مکانیک، دانشگاه تربیت مدرس، تهران، ایران | ||
| 2دانشیار گروه تبدیل انرژی دانشکده مهندسی مکانیک/دانشگاه تربیت مدرس | ||
| 3دانشکده هوا و فضای، دانشگاه خواجه نصیرالدین طوسی | ||
| چکیده | ||
| در سیستم احتراق یک توربین گاز سوخت مایع، به دلیل محدودیت طول لوله پیش مخلوط، فرآیند تبخیر قطرات سوخت به طور کامل انجام نمی‌گیرد و قطرات وارد محفظه احتراق می‌شوند. وجود این قطرات در محفظه احتراق باعث می‌گردد که اشتعال در حالت غیر پیش مخلوط انجام شود و متعاقب آن میزان نشر اکسیدهای نیتروژن افزایش یابد. برای جلوگیری از نشر این آلاینده‌ها، می‌بایست قطرات اسپری در یک فضای محدود به طور کامل تبخیر گردد. بدین منظور در این جا، یک مکانیزم برای پاشش قطرات سوخت در لوله پیش مخلوط ارائه شده است. در این مکانیزم، قطرات اسپری با الگوی مخروط توخالی در خلاف جهت جریان هوا تزریق می‌شود. بنابراین در این نوع پاشش، به دلیل افزایش سرعت نسبی قطرات و تسریع در فرآیندهای شکست و تبخیر آنها، دستیابی به این هدف امکان‌پذیر می‌باشد. در بررسی صحت این موضوع، الگوهای مختلفی از پاشش قطرات ان-هپتان در گاز ازت عبوری از لوله پیش مخلوط با دمای 800 کلوین و فشار 20 بار در سیستم اویلری - لاگرانژی شبیه‌سازی شده است. اعتبار مدل‌های توربولانس، انتقال جرم و حرارت و نیز اثر نفوذ مولکول‌های گاز به داخل قطرات سوخت در فشار بالای محیط ارزیابی شده است. نتایج حاصل نشان می‌دهد که با تزریق قطرات اسپری با الگوی اشاره شده، علاوه بر تبخیر کامل قطرات در فضای محدود، توزیع دما و کسر جرمی بخار سوخت در خروجی لوله نیز یکنواخت می‌گردد. | ||
| کلیدواژه‌ها | ||
| لوله پیش مخلوط؛ تبخیر قطره؛ فشار بالا؛ پاشش سوخت؛ توربین گاز | ||
| عنوان مقاله [English] | ||
| Investigation of the Effect of Spray Fuel Injection Pattern on Evaporation of Droplets in the Gas Turbine Pre-mixer | ||
| نویسندگان [English] | ||
| Ahmad Kazemi Fard1؛ Hassan Khaleghi2؛ Reza Ebrahimi3 | ||
| 1Mechanical Engineering Department, Tarbiat Modares University, Tehran, Iran | ||
| 3Aerospace Engineering Department, K.N. Toosi University of Technology, Tehran, Iran. | ||
| چکیده [English] | ||
| In a liquefied gas turbine combustor, due to the limited length of the premix tube, the evaporation process of fuel droplets is not completely carried out inside the tube, and the droplets enter the combustion chamber. The presence of droplets in the combustor causes the reactions to occur in the non-premix mode and the emission of NOx increases as a result. To avoid the emission of this pollutant, it is necessary that the droplets are evaporated completely in a limited space. Herein, a mechanism is proposed for spraying the droplets, in which, fuel droplets are injected to form a hollow-cone spray pattern in the opposite of the gas flow direction. In this type of injection, due to the relative velocity of droplets and subsequent enhancement of the droplet break-up and evaporation processes, it is possible to achieve this goal. To verify this matter, various patterns of injected n-heptane droplets into nitrogen gas passing through a premix tube have been simulated at the temperature of 800 K and the pressure of 20 bar using the Eulerian-Lagrangian approach. The validation of heat and mass transfer models, as well as the influence of gas molecules penetration into fuel droplets, has been evaluated. The results showed that using this type of injection, in addition to full evaporation of droplets in the limited space, the distribution of the temperature and the fuel vapor mass fraction in the tube outlet are more evenly distributed | ||
| کلیدواژه‌ها [English] | ||
| Premix tube, Droplet evaporation, High pressure, Fuel injection, Gas turbine | ||
| مراجع | ||
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[1] Y. Wang, C.J. Rutland, DNS study of the ignition of n-heptane fuel spray under high pressure and lean conditions, Journal of Physics: Conference Series, 16 (2005) 124-128. [2] F. Wang, A.I. Sayma, Z.J. Peng, Y. Huang, A Multi-Section Droplet Combustion Model for Spray Combustion Simulation, in: ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition, American Society of Mechanical Engineers, Vancouver, British Columbia, Canada, 2011, pp. 7-16. [3] C.H. Beck, R. Koch, H.-J. Bauer, Investigation of the effect of incomplete droplet prevaporization on NOx emissions in LDI combustion systems, Journal of Engineering for Gas Turbines and Power, 130(5) (2008) 051504. [4] X. Gu, S. Basu, R. Kumar, Vaporization and collision modeling of liquid fuel sprays in a co-axial fuel and air pre-mixer, International Journal of Heat and Mass Transfer, 55(19–20) (2012) 5322-5335. [5] X. Gu, S. Basu, R. Kumar, Correlations of vaporization performance of conventional and biofuel sprays in a crossflow heated chamber, International Communications in Heat and Mass Transfer, 39(10) (2012) 1478-1486. [6] X. Gu, S. Basu, R. Kumar, Dispersion and vaporization of biofuels and conventional fuels in a crossflow pre-mixer, International Journal of Heat and Mass Transfer, 55(1–3) (2012) 336-346. [7] H. Zhang, B. Bai, L. Liu, H. Sun, J. Yan, Mixing of hollow-cone spray with a confined crossflow in rectangular duct, AIAA journal, 51(3) (2013) 615- 622. [8] M. Brandt, M. Rachner, G. Schmitz, An experimental and numerical study of kerosine spray evaporation in a premix duct for gas turbine combustors at high pressure, Combustion Science and Technology, 138(1-6) (1998) 313-348. [9] S. Deshpande, J. Gao, M.F. Trujillo, Characteristics of hollow cone sprays in crossflow, Atomization and Sprays, 21(4) (2011). [10]R. Surya Prakash, H. Gadgil, B.N. Raghunandan, Breakup processes of pressure swirl spray in gaseous cross-flow, International Journal of Multiphase Flow, 66(0) (2014) 79-91. [11]H. Zhang, B. Bai, L. Liu, H. Sun, J. Yan, Droplet dispersion characteristics of the hollow cone sprays in crossflow, Experimental Thermal and Fluid Science, 45(0) (2013) 25-33. [12]A. Sinha, R.S. Prakash, A.M. Mohan, R.V. Ravikrishna, Airblast spray in crossflow–structure, trajectory and droplet sizing, International Journal of Multiphase Flow, 72 (2015) 97-111. [13]B. Bai, H. Sun, H. Zhang, L. Liu, Numerical study on turbulent mixing of spray droplets in crossflow, Journal of Propulsion and Power, 27(1) (2011) 132- 143. [14]W. Wang, H. Zhang, Z. Zhao, Q. Zheng, B. Bai, Mixing of hollow-cone water spray in a confined high-temperature gas crossflow, Computers & Fluids, (2017). [15]C.T. Crowe, M.P. Sharma, D.E. Stock, The particle- source-in cell (PSI-CELL) model for gas-droplet flows, Journal of fluids engineering, 99(2) (1977) 325-332. [16]S. Subramaniam, Lagrangian–Eulerian methods for multiphase flows, Progress in Energy and Combustion Science, 39(2) (2013) 215-245. [17] K.K. Kuo, Principles of combustion, (1986). [18] T. Poinsot, D. Veynante, Theoretical and Numerical Combustion, 2nd ed., Edwards, 2005. [19] S.K. Aggarwal, A review of spray ignition phenomena: Present status and future research, Progress in Energy and Combustion Science, 24(6) (1998) 565-600. [20] A. Omidvar, Numerical Modeling and Analysis of Turbulence Effect on Breakup Dynamic of Evaporating Spray Droplets, Ph.D Thesis, Tarbiat Modarres University, Tehran, 2009. [21] D.D. Ganji, Three dimensional liquid spray modeling in internal combustion engines, Tarbiat Modarres University, Tehran, 2004. [22] F. Mashayek, Droplet–turbulence interactions in low-Mach-number homogeneous shear two-phase flows, Journal of Fluid Mechanics, 367 (1998) 163- 203. [23] S. Gorji, M. Seddighi, C. Ariyaratne, A.E. Vardy, T. O’Donoghue, D. Pokrajac, S. He, A comparative study of turbulence models in a transient channel flow, Computers & Fluids, 89 (2014) 111-123. [24] T.A. Abul Kalam Azad, Computational Modeling of Turbulent Ethanol Spray Flames in a Hot Diluted Coflow using OpenFOAM, Delft University of Technology 2015. [25] M.M. El Wakil, O.A. Uyehara, A theoretical investigation of the heating-up period of injected fuel droplets vaporizing in air, University of North Texas, 1954. [26] E. Babinsky, P.E. Sojka, Modeling drop size distributions, Progress in energy and combustion science, 28(4) (2002) 303-329. [27] A.H. Lefebvre, D.R. Ballal, Gas Turbine Combustion Alternative Fuels and Emissions, CRC PressTaylor & Francis Group, 2010. [28] M.A. Patterson, R.D. Reitz, Modeling the effects of fuel spray characteristics on diesel engine combustion and emission, 0148-7191, SAE Technical Paper, 1998. [29] F.P. Kärrholm, Numerical modelling of diesel spray injection, turbulence interaction and combustion, Chalmers University of Technology, Goteborg, 2008. [30] P. Ghadimi, M. Yousefifard, H. Nowruzi, Applying Different Strategies within OpenFOAM to Investigate the Effects of Breakup and Collision Model on the Spray and in-Cylinder Gas Mixture Attribute, Journal of Applied Fluid Mechanics, 9(6) (2016). [31] J.L. Santolaya, J.A. García, E. Calvo, L.M. Cerecedo, Effects of droplet collision phenomena on the development of pressure swirl sprays, International Journal of Multiphase Flow, 56 (2013) 160-171. [32] N. Nordin, Complex chemistry modeling of diesel spray combustion, Chalmers University of Technology, Goteborg, 2001. [33] G.S. Zhu, S.K.Aggarwal, Fuel droplet evaporation in a supercritical environment, Journal of Engineering for Gas Turbines and Power(Transactions of the ASME), 124(4) (2002) 762-770. [34]L. Zhang, S.-C. Kong, High-pressure vaporization modeling of multi-component petroleum–biofuel mixtures under engine conditions, Combustion and Flame, 158(9) (2011) 1705-1717. [35]W. Long, P. Yi, M. Jia, L. Feng, J. Cui, An enhanced multi-component vaporization model for high temperature and pressure conditions, International Journal of Heat and Mass Transfer, 90 (2015) 857- 871. [36] M.D. Koretsky, Engineering and chemical thermodynamics, Wiley Hoboken, NJ, 2004. [37]H. Jasak, Error analysis and estimation for the finite volume method with applications to fluid flows, Imperial College London London, 1996. [38] H.G. Weller, G. Tabor, H. Jasak, C. Fureby, A tensorial approach to computational continuum mechanics using object-oriented techniques, Computers in physics, 12(6) (1998) 620-631. [39] OpenFoam, The Open Source CFD Toolbox, User Guide, Version, 1(9) (2008). [40] G. Reich, H. Beer, Fluid flow and heat transfer in an axially rotating pipe—I. Effect of rotation on turbulent pipe flow, International journal of heat and mass transfer, 32(3) (1989) 551-562. [41] A.J. Ward-Smith, Internal fluid flow-the fluid dynamics of flow in pipes and ducts, NASA STI/ Recon Technical Report A, 81 (1980). [42] L. Zhang, Multicomponent drop vaporization modeling of petroleum and biofuel mixtures, Iowa State University, Ames, 2011. [43] H. Nomura, Y. Ujiie, H.J. Rath, J.i. Sato, M. Kono, Experimental study on high-pressure droplet evaporation using microgravity conditions, Symposium (International) on Combustion, 26(1) (1996) 1267-1273. | ||
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