ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Off-design performance characteristics of inward turning inlet with rectangular-to-circular shape transition with controlled Mach number distribution
Received date: 2015-11-02
Revised date: 2016-03-01
Online published: 2016-03-08
Supported by
National Natural Science Foundation of China (90916029, 91116001)
Based on the axisymmetric basic flowfield of diffusing reflected shock center body with arc tangent Mach number distribution, an inward turning inlet with rectangular-to-circular shape transition is designed. Wind tunnel experiment and numerical simulation are conducted to obtain the off-design performance characteristics and self-starting characteristics. The experimental results indicate that the top wall pressure distribution is of arc tangent curve. The inlet has good overall performance and small vortex region at exit section. For Ma=5.0 and Ma=7.0, the total pressure recovery coefficient of exit section is 0.647 and 0.443, respectively, and the corresponding compression ratio is 20.0 and 32.7, respectively. For Ma=5.0, the inlet could capture about 90% of the free stream and self-start despite its internal contraction ratio being above the Kantrowitz limit; the lower critical back pressure of the inlet is about 64 times of the free stream static pressure, and the corresponding Mach number and total pressure recovery coefficient of exit section are 1.32 and 0.409, respectively. The results demonstrate that high-performance inward turning inlets with rectangular-to-circular shape transition can be designed by the method proposed in this paper.
LI Yongzhou , ZHANG Kunyuan , SUN Di . Off-design performance characteristics of inward turning inlet with rectangular-to-circular shape transition with controlled Mach number distribution[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016 , 37(11) : 3263 -3272 . DOI: 10.7527/S1000-6893.2016.0060
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