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E. K. Derunov V. F. Volkov A. A. Zheltovodov A. I. Maksimov 《Thermophysics and Aeromechanics》2009,16(1):13-35
The results of experimental and numerical investigations of the peculiarities of flow around two identical cylindrical bodies
of revolution of diameter D = 50 mm and the body aspect ratio λ = 5 with conical forebodies whose apex angles are θ = 40° and 60°, which are located above a horizontal surface in parallel with one another and with the flow, are presented
for the Mach numbers M∞ = 4.03, Reynolds numbers Re1 ≈ 55·106 m−1, fixed distance from the surface Y = Δy/D = 0.96, and the gaps between their axes Z = Δz/D = 1.06−2.4. The peculiarities of three-dimensional turbulent separated flows realizing on the bodies and on the plate as
well as the possibilities of predicting the aerodynamic forces and moments acting on the bodies on the basis of numerical
computations within the framework of the Euler equations are considered. 相似文献
174.
Flow-generated noise problem caused by in-duct elements is due to the complicated acoustic and turbulent interactions of multiple in-duct flow noise sources. The approach of partially coherent sound fields used previously by Mak and Yang [C.M. Mak, J. Yang, Flow-generated noise radiated by the interaction of two strip spoilers in a low speed flow ducts, Acta Acust united with Acustica 88 (2002) 861–868] and Mak [C.M. Mak, A prediction method for aerodynamic sound produced by multiple elements in air ducts, J Sound Vib 287 (2005) 395–403] is adopted to formulate the sound powers produced by interactions of multiple elements at frequencies below and above the cut-on frequency of the lowest transverse duct mode. The study indicates that the level and spectral distribution of the additional acoustic energy produced by the interactions of multiple elements can be predicted based on the measured data with respect to the interactions. The proposed method can form a basis of a generalized prediction method for flow-generated noise produced by multiple elements. The application of the proposed method is supported by two engineering examples. 相似文献
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1 Introduction Toattainhigh poweroutputofthegasdynamiclaserchemicallaser ,high speedgasflowtoremovewasteheatisrequired .EspeciallyatanaveragepowerlevellargerthantensofkW ,onlyhighspeedgasflowcanensureefficientheatelimination .Thereforethelasergasmediumof… 相似文献
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A. V. Antonets 《Fluid Dynamics》2003,38(6):942-948
A method of determining the time-dependent aerodynamic characteristics of flight vehicles by numerically calculating the steady-state flow past equivalent bodies is developed. The method can be rigorously validated if a hypothesis of local force interaction (in particular, the hypersonic piston analogy or the plane sections law) is adopted. The well-known curved-body method of V. V. Lunev is considerably improved by obtaining some new, aerodynamically equivalent vehicle shapes which maximally correspond (without the errors inherent in auxiliary transformations) to the postulated scheme of local calculation of the distributed aerodynamic forces. The technique developed makes it possible to calculate the combined effect of the angle of attack, the angular velocities, and the position of the center of oscillation on the damping coefficients. For vehicles in the shape of blunt circular cones the results obtained are in good agreement with the data calculated using the linear expansion method. 相似文献
179.
安装在车辆尾部1边和2边上的导流装置在降低大后壁车辆气动阻力中的作用和机理已在前面的实验中得出,为了搞清安装在车辆尾部3边和4边上的导流装置在降低大后壁车辆气动阻力中的作用和机理,本文利用1/16缩比的公共汽车模型及两种类型的导流装置,在一带有可移动地面和边界层吸收装置的开放型风洞中,进行了在车辆后端面的上、下、侧边的3边和4边分别安装导流装置时车辆后部尾流区的压强恢复及气动阻力降低的实验。对每一组合的导流装置,其与车辆表面的间隙尺寸是从0mm增加到5mm,间隔为1mm。通过对不同组合、不同间隙的导流装置的压强恢复效果和阻力降低效果的实验对比和分析,最终找出了能使车辆的气动阻力降低16%左右的最佳位置组合,为新型车辆的设计和改造提供了有利依据。 相似文献
180.
Aerodynamic heating in the region of shock and turbulent boundary layer interaction induced by a cylinder 总被引:1,自引:0,他引:1
Detailed distributions of heat flux in the region of shock wave and turbulent boundary layer interaction induced by a cylinder
were measured in the shock tunnel. Oil flow patterns and Schlieren photographs were taken. Empirical relations were given
for determining separation shock angle, peaks of heat flux and their locations on both cylinder leading edge and flat plate
surface, and other characteristic parameters of the interaction region. 相似文献