| The key of designing hypersonic inward turning inlet is to design its basic flow field.A new kind of design methodology of axisymmetric basic flow field with controlled wall Machnumber distribution law is investigated using the rotational method of characteristics. The influencesof basic flow field’s geometry parameter (include leading edge deflection angle and center bodyradius) and three typical wall Mach number distributions on basic flow field were studied at Ma=6.Finally, viscous correction was studied considering the influence of viscous.With this design methodology of basic flow field, in combination with streamline tracing andshape transition technique, hypersonic inward turning inlets with rectangular to circular shapetransition are designed and investigated with numerical simulation method using different wall Machnumber distributions. The numerical results indicate that inlet using sectional continuous Machnumber distribution has weak leading shock wave, small internal contraction ratio and good overallperformance. But its start performance needs to investigate deeply.Two kinds of innovative basic flow field BF-1and BF-2with controlled center body is designedand studied, which are helpful to weak the reflection shock wave and increase the compressionefficiency. Based on these new kinds of basic flow field, hypersonic inward turning inlets withrectangular to circular shape transition is designed and studied by numerical simulation, The resultsindicate, comparing with the typical one, the new inlets has weaker cowl shock wave/boundary layerinteraction, better flow field construction, higher compression efficiency, but their drags increase. TheBF-2inlet has higher overall performances, in contrast, the BF-1inlet has better flow fieldconstruction, start performance and drag features. The numerical simulation results show that its startMach number is3.6at total Contraction6.6while the BF-2inlet’s start Mach number is3.8.Finally, parametric study is performed to obtain the laws of overall performance variation of therectangular to circular shape transition inlets. Results show that the inward turning inlets with highaspect of rectangular and low ratio of ellipse’s major axis and minor axis will have ideal performances.And using the arc tangent shape transition function could have better performances. |
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