A modularized airframe/propulsion integrated model is established by oblique shock wave theory, engineering method and method of characteristics(MOC). Based on this method, a new design methodology for hypersonic waverider vehicle which integrated scramjets with waverider airframe derived from cone-wedge flow field is presented. Integrated aero-propulsion performance of the waverider vehicle under on-design and off-design conditions is predicted using Euler equations discretized by Harten-Yee non-MUSCL TVD scheme and the combustor flow field is approximated by a quasi-lD cycle analysis, skin friction of vehicle is calculated by reference temperature method. According to the numerical simulations it shows that the hypersonic waverider vehicle designed in this paper not only has a multi-level pre-compression fore-body which can reduce inlet design difficulties and provide uniform air flow for scramjet but also has the whole waverider airframe which can provide high lift-to-drag ratio. Therefore the integrated design methodology developed in this paper can be used in designing the elementary configuration for practical air-breathing hypersonic vehicles.
Direct numerical simulations of turbulent channel flows with moving spanwise wall is performed in this paper. The aim of this work is to show what influences can be caused in turbulent channel flow by spanwise moving wall, that introduces a new characteristic velocity. Figure 1 shows the flow geometry and the coordinate system. The DNS was performed using the standard spectral method. Three cases with the spanwise wall velocity W=0, U,~ and 2Urn are simulated at constant flow rate, here U,~ is the mean stream velocity. The necessary parameters for DNS are as follows: Rein = U,~5/r,=2 800 (Re~-o = u~-oS/y~180), the computational domain is 47r5, 25 and 27r5 for the streamwise (x), normal (y) and spanwise (z) directions, respectively, and the grid resolution is 128•215The results show that spanwise moving wall induce the skin friction increasing. The second-order turbulence statistics such as root-mean-square velocity fluctuations, Reynolds shear stress and root-mean-square vorticity fluctuations are substantial increase with spanwise velocity increasing. It is also observed that the root-mean-square velocity fluctuations become more even across the channel with spanwise velocity increasing.
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