Integration Layout Design For Three-Dimension Inward-Turning Inlet And Conical Forebody

To achieve a good match between internal contraction flow field of the 3D inwardturning inlet and external compression flow field of the conical forebody,the integrated layout of the 3D inward-turning inlet and conical forebody is studied in this paper.The full text mainly includes:(1)On the basis of the study on the lift-resistance characteristics of cone-like forebody with different configurations,the classical integration layout of inwardturning inlet and cone-like forebody is studied,and the influence of the ratio of inlet width to height and the installation position of the inlet on the performance of the classical integration layout was analyzed.It is found that the lift-resistance performance of cone-like forebody can be effectively improved by selecting suitable cross section configurations.Too large or too small inlet aspect ratio is bad for the improvement of the lift resistance performance of the classical integration layout,while too large inlet aspect ratio will reduce the outlet performance of inward-turning inlet of the integrated layout.The installation location of the inlet has little effect on the lift-resistance performance of the integrated layout,but it will obviously affect the outlet performance of the inward-turning inlet.(2)Based on the constraint condition of the exit of the isolation section,an integrated design method of inverted inward-turning inlet and conical forebody is proposed,and an integrated layout of inverted inward-turning inlet and conical forebody is designed based on the method.The effects of parameters such as the generatrix length of the conical forebody,the central angle of the inlet and the length of the S-shape isolation section on the performance of the inverted integrated layout are analyzed by numerical simulation.The results show that the inverted integrated layout can effectively reduce the bending degree of the S-shape isolation section of the inlet and reduce the flow loss in the S-shape isolation section.The generatrix length of the conical forebody has the most significant influence on the total pressure recovery coefficient and the pressure ratio of the inlet.The central angle of the inlet and the length of S-shape isolation section of the inlet mainly affect the total pressure recovery coefficient of inlet.(3)Aimed at the problem of interaction between forebody boundary-layer and the flow field of the inlet in the traditional integration layout of single-module inwardturning inlet and conical forebody(SII/CF),an integrated design method for the layout of double-modules chin inward-turning inlet and conical forebody(DCII/CF)with the effect of boundary-layer displacement is proposed.And based on this method,a novel DCII/CF integration layout by side installation is designed.In this paper,the DCII/CF integrated configuration is compared with the traditional SII/CF integrated configuration by numerical simulation.The results show that,the DCII/CF integrated layout not only achieves a good match between the external conical shock of the conical forebody and the internal conical shock of the inward-turning inlet,but also provides an excellent forebody boundary-layer displacement effect for the inwardturning inlet.Moreover,the DCII/CF integrated layout effectively avoids the mutual interference between the forebody boundary-layer and the internal flow field of the inlet in the traditional SII/CF layout.