شبیه‌سازی عددی تغییرات پارامترهای هندسی ایندیوسرهای طراحی شده بر عملکرد هیدرولیکی یک پمپ گریز از مرکز

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه مهندسی مکانیک، دانشگاه تهران، تهران, ایران

2 دانشیار، گروه مهندسی مکانیک، دانشگاه تهران،تهران, ایران

3 استاد، گروه مهندسی مکانیک، دانشگاه تهران، تهران, ایران

چکیده

بهره‌مندی از ایندیوسر جهت جلوگیری از کاهش فشار حدفاصل ورودی پمپ گریز از مرکز تا ابتدای پره و بهبود عملکرد آن در سرعت­های مخصوص مکش ­بالا، دارای کارکرد موثری می‌باشد. ایندیوسر چرخی محوری با تعداد پره‌ی کمتر از چرخ پمپ (3 یا 4) و زاویه‌ی حمله‌ی کوچک‌ بوده، در بالادست محور چرخ پمپ نصب و با آن می‌چرخد. در این تحقیق پس از طراحی ایندیوسر برای یک پمپ، عملکرد آن با تغییر پارامترهای هندسی به صورت عددی مورد بررسی قرار می‌گیرد. نتایج عددی نشان داد که افزایش نسبت گام از 24/. به 48/. باعث افزایش فشار از 10% به 34% می‌شود در صورتیکه با افزایش نسبت طول به قطر از  به ، افزایش فشار تقریباً ثابت و برابر 23% می‌گردد. ملاحظه شد که با افزایش گام در دبی‌های کم، هد تولیدی چرخ پمپ کاهش می‌یابد. این موضوع می‌تواند بعلت عدم تبعیت جریان از هندسه ایندیوسر و در نتیجه ایجاد شرایط نامناسب در ورودی چرخ پمپ باشد. امّا با کاهش آن در دبی‌های بالا، هد مذکور، بعلت ایجاد چرخش معکوس در خروجی ایندیوسر و ورودی پمپ، افزایش می‌یابد.

کلیدواژه‌ها

موضوعات


[1]  Karassik I., Krutzsch W. C., Fraser W. H. and Messina, J. P., Pump Handbook, McGraw-Hill, 2ed Edition, 2008.
[2]  Stripling L. B., and Acosta, A. J., Cavitation in Turbopumps,  Part 1, ASME J. Fluids Eng., 84(3), pp. 326–338, 1962.
[3]  d’Agostino L., Turbomachinery Developments and Cavitation, VKI Lecture Series on Fluid Dynamics Associated to Launcher Developments, von Karman Institute of Fluid Dynamics, Rhode-Saint-Gene`se, Belgium, Apr. 15–17, STO-AVT-LS-206, Paper No. NBR 12-1, 2013
[4]  Hong S., Kim D., Kim J., Choi Ch., and Kim Ji., Study on Inducer and Impeller of a Centrifugal Pump for a Rocket Engine Turbopump, Proc. IMechE Part C, Journal of Mechanical Engineering Science, 227(2), pp. 311-319, 2012.
[5]  Wegner M., Acosta A. J. and Tsujimoto Y., Panel Discussion on Inducer Design Criteria, Journal of Rotating Machinery, pp. 229-237, 2003.
[6]  Arnone A., Boncinelli P., Capuani A., Spano E. and  Rebattet C., “ARIANE 5” tplox Inducer Design Strategies to Enhance Cavitating Performance, Concept NREC CAV, B-7.004, 2001.
[7]  Acosta A. J., Tsujimoto Y., Yoshida Y., Azuma S. and Cooper P., Effects of Leading Edge Sweep on the Cavitating Characteristics of Inducer Pumps, Journal of Rotating Machinery, pp. 397-404, 2001.
[8]  Mishra A. and Gosh P., Predicting Performance of Axial Pump Inducer of LOX Booster Turbo-Pump of Staged Combustion Cycle Based Rocket Engine Using CFD, Materials Science and Engineering, IOP Conf. 2015.
[9]  Bakir F., Kouidri S., Noguera R. and Rey R., Experimental Analysis of an Axial Inducer Influence of the Shape of the Blade Leading Edge on the Performances in Cavitating Regime, Journal of Fluids Engineering, Vol. 125, pp. 293-301, 2003.
[10]             Bakir F., Kouidri S., Mejri I. and Rey R., Hub Shape Effects Under Cavitation on the Inducers Performance, Fifth International Symposium on Cavitation CAV 2003, 1-4, 2003.
[11]             Bouziad Y., Farhat M., Guennoun F., Kueny J. and Avellan F., Physical Modelling and Simulation of Leading Eedge Cavitation Application to an Industrial Inducer, Fifth International Symposium on Cavitation CAV 2003, 1-4, 2003.
[12]              Watanabe T., Kang D., Cervone A., Kawata Y. and Tsujimoto Y., Choked Surge in a Cavitating Turbopump Inducer, Journal of Fluid Machinery and Systems, Vol. 1, No. 1, pp. 64-75, 2008.
[13]              R. C. Cluff, R. K. Lundgreen, and S. E. Gorrell, “A Comparison of three-bladed and four-bladed Inducers at On and Off Design Flow Rates.” pp. 1–12, 2013
[14]             Pace G., Valentini D., Pasini A., Torre L., Fu Y. and d’Agostino L., Geometry Effects on Flow Instabilities of Different Three-Bladed Inducers, J. Fluids Eng., vol. 137, No. 4, p. 41304, 2015.
[15]             Ning C., Wang Y., Zhu Z. T., Xie S. F., Zhao L. F., and Liu Z. C., Numerical Calculation for Cavitation Flow of Inducer, IOP Conf. Series: Materials Science and Engineering Vol. 72, No. 32025, 2015.
[16]             Agostino L., Torre L., Pasini A., and Cervone A., A Reduced Order Model for Preliminary Design and Performance Prediction of Tapered Inducers, the 12th International Symposium on Transport Phenomena and Dynamics Rotating Machinery, Feb. 17-22, 2008.
[17]             Alemi H., Volute Geometry Modification of Centrifugal Pump in Direct and Reverse Modes Using Numerical and Experimental Methods to Reduce Radial Force, PhD Thesis, School of Mechanical Engineering. University of Tehran, 2014. (in Persion فارسی)
[18]             Mohammadipour D., Najafi A. F., Alemi Arani H. and Riasi A. R.,  Numerical Analysis on the Effects of Impeller Geometry Parameters for a Centrifugal Pump in Reverse Operation, Modarres Mechanical Engineering, Vol. 17, No. 9, pp. 13-24, 2017. (in Persion فارسی)
[19]             Gülich J. F., Centrifugal Pumps, Third Edition, Fig.6.21, Berlin, Springer, 2014.
[20]             Huzel D. K. and Huang D. H., Design of Liquid Propellant Rocket Engines, Washington, D.C. 1967.
[21]             Lakshminarayana B., Fluid Dynamics of Inducers Review, Journal of Fluids Engineering, Vol. 104, pp. 411-427, 1982.
[22]             Lakshminarayana B., Visualization Study of Flow in Axial Flow Inducer, Journal of Basic Engineering, pp. 777-787, 1972
[23]             Furst R, Desclaux, J., A Simple Procedure for Prediction of NPSH Required by Inducers. ASME FED. 81, 1-9, 1989.
[24]             Jacobsen, J.K.: NASA space vehicle criteria for liquid rocket engine turbopump inducers. NASA SP-8052 (1971)
[25]             Janigro A and Ferrini, F.: Inducer Pumps. Von Karman Inst. LS. 61, (1973)
[26]             NASA (ed.): Liquid rocket engine axial-flow turbopumps. NASA SP-8125 (1978)
[27]             Collins Cluff R.: An investigation of off-design operation in high suction performance inducers. MSc Thesis, Faculty of Brigham Young University, (2015).
[28]             Pourabbollah D., Numerical fluid flow analysis to investigate the effect of Inducer design parameters on a centrifugal pump performance, MSc Thesis, School of Mechanical Engineering, University of Tehran, 2017. (in Persion فارسی )
[29]             Ansys FLUENT User’s Guide, Version 15, 2014.
[30]             Alemi H., Nourbakhsh S. A., Raisee M. and Najafi A. F., Effects of Volute Curvature on Performance of a Low Specific-Speed Centrifugal Pump at Design and off Design Conditions, Journal of Turbomachinery, Vol. 137, No. 4, pp. 1-10, 2016.
[31]             Ehghaghi M. B. M. and Vajdi M., Numerical and Experimental Study of Splitter Blades Effect on the Centrifugal Pump Performance, Modares Mechanical Engineering, Vol. 15, No. 3, Tabriz, pp. 398–410, 2015. (in Persianفارسی )
[32]             Alemi H., Nourbakhsh S. A., Raisee M. and Najafi A. F., Effects of Volute Tongue Profile the on Performance of a Low Specific-Speed Centrifugal Pump, Journal of Power and Energy, Vol. 229, No. 2, pp. 10-20, 2015.
[33]             Alemi H.,. Nourbakhsh S. A., Raisee M. and Najafi A. F., Mechanics Development of New Multi Volute Casing Geometries for Radial Force Reduction in Centrifugal Pumps, Journal of Engineering Applications of Computational Fluid Mechanics, Vol. 9, No. 1, pp. 1–11, 2015..
[34]             Salim S. and Cheah S., Wall Y+ Strategy for Dealing with Wall-bounded Turbulent Flows, Proceedings of the International Multi Conference of Engineers and Computer Scientists, Kowloon, Hong Kong, March 18-20, 2009.
[35]             Selecting Centrifugal Pumps, KSB Aktiengesellschaft, Communications (V5), 67225, Frankenthal/Germany, 2005.