ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Effect of geometry parameters on flow field quality in a transonic slotted wind tunnel
Received date: 2015-06-30
Revised date: 2015-10-22
Online published: 2015-11-13
Numerical simulation method is applied to studying the effect of the re-entry flap angle, slot diverging angle and slot shape on the flow field quality in a transonic slotted wind tunnel. Boundary conditions at the inlet and outlet of the tunnel are introduced, and also, similarity parameters are obtained through dimensional analysis. The results show that a sonic throat will be formed at the leading edge if the re-entry flap is closed, leading to the inability to establish stable supersonic flow at the test section. When the re-entry flap is open, the slot outflow which comes from the plenum is the main disturbance source of the flow field and could be wakened with a larger slot diverging angle. All the components affect the flow field quality by strengthening or wakening the slot outflow while the slot shape is the most sensitive. An optimization approach based on free form deformation (FFD) method is adopted and therefore a slot shape which is applicable to cases from 0.8 to 1.2 Mach number in test section is obtained. Results of the optimization show that most of the slot outflow which occurs in the original configuration has been eliminated and the mean square error of Mach number distribution at the test section is reduced by an order of magnitude, proving that the optimization approach is reasonable and practicable.
JU Lian , BAI Junqiang , GUO Bin , CUI Xiaochun , LI Xinglong . Effect of geometry parameters on flow field quality in a transonic slotted wind tunnel[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016 , 37(5) : 1440 -1453 . DOI: 10.7527/S1000-6893.2015.0290
[1] 伍荣林, 王振羽. 风洞设计原理[M]. 北京:北京航空学院出版社, 1985:113. WU R L, WANG Z Y. Principle of wind tunnel design[M]. Beijing:Beijing Aeronautical University Press, 1985:113(in Chinese).
[2] WARD V G, WHITCOMB C F, PEARSON M D. Air-flow and power characteristics of the langley 16-foot transonic tunnel with slotted test section:NACA-RM_L52E01[R]. Washington, D.C.:NACA, 1952.
[3] LITTLE J B, CUBBAGE J J. The development of an 8-inch by 8-inch slotted tunnel for Mach numbers up to 1.28:NACA-RM-L55B08[R]. Washington, D.C.:NACA, 1955.
[4] WU J M, COLLINS F G, BHAT M K. Three-dimensional flow studies on a slotted transonic wind tunnel wall[J]. AIAA Journal, 1983, 21(7):999-1005.
[5] EVERHART J L, BOBBITT P J. Experimental studies of transonic flow field near a longitudinally slotted wind tunnel wall[M]. Hampton, Virginia:National Aeronautics and Space Administration, 1994:1-54.
[6] AGRELL N, PETTERSSON B, SEDIN Y. Numerical computations and measurements of transonic flow in a slotted-wall wind tunnel[C]//AIAA Applied Aerodynamics Conference, 5th. Monterey, California:AIAA, 1987:572-577.
[7] SEDIN Y, SORENSEN H. Computed and measured wall interference in a slotted transonic test section[J]. AIAA Journal, 1986, 24(3):444-450.
[8] KARISSON K R, SEDIN Y. Numerical design and analysis of optimal slot shapes for transonic test sections-Axisymmetric flows[J]. Journal of Aircraft, 1981, 18(3):168-175.
[9] KEMP J W. Computer simulation of a wind tunnel test section with discrete finite-length wall slots:NASA_CR_3948[R]. Hampton:Langley Research Center, 1986.
[10] RAMASWAMY M A, CORNETTE E S. Supersonic flow development in slotted wind tunnels[J]. AIAA Journal, 1982, 20(6):805-811.
[11] GLAZKOV S A, GORBUSHIN A R, IVANOV A I, et al. Numerical and experimental investigations of slot flow with respect to wind tunnel wall interference assessment[C]//24th AIAA Aerodynamic Measurement Technology and Ground Testing Conference. Reston:AIAA, 2004:1-15.
[12] 丛成华, 彭强, 王海锋. 槽壁试验段低超声速流场特性数值模拟[J]. 航空学报, 2010, 31(12):2302-2308. CONG C H, PENG Q, WANG H F. Numerical simulation on characteristics of slotted test section of low supersonic field[J]. Acta Aeronautica et Astronautica Sinica, 2010, 31(12):2302-2308(in Chinese).
[13] 汪伏波. 跨声速风洞槽壁试验段流动特性初步研究[D]. 绵阳:中国空气动力研究与发展中心, 2010. WANG F B. Preliminary research on flow characteristic of transonic wind tunnel slotted test section[D]. Mianyang:China Aerodynamics Research and Development Center, 2010(in Chinese).
[14] AL-J SAADI A. Wall interference and boundary simulation in a transonic wind tunnel with a discretely slotted test section:2003 Technical Report 94N15794[R]. Washington, D. C:NASA, 1993.
[15] ROE P L. Approximate Riemann solvers, parameter vectors, and difference schemes[J]. Journal of Computational Physics, 1981, 43(2):357-372.
[16] MENTER F R. Zonal two equation k-w turbulence models for aerodynamic flows:AIAA-1993-2906[R]. Reston:AIAA, 1993.
[17] MENTER F R. Two-equation eddy-viscosity turbulence models for engineering applications[J]. AIAA Journal, 1994, 32(8):1598-1605.
[18] HANCHE-OLSEN H. Buckingham's pi-theorem[J]. Mathematical Modeling, 2004, 1(1):2-7.
[19] SEDERBERG T W, PARRY S R. Free-form deformation of solid geometric models[J]. Acm Siggraph Computer Graphics, 1986, 20(4):151-160.
[20] DEB K, PRATAP A, AGARWAL S, et al. A fast and elitist multiobjective genetic algorithm:NSGA-II[J]. Evolutionary Computation, IEEE Transactions on, 2002, 6(2):182-197.
[21] BAYRAKTAR H, TURALIOGLU F S. A Kriging-based approach for locating a sampling site-in the assessment of air quality[J]. Stochastic Environmental Research and Risk Assessment, 2005, 19(4):301-305.
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