ACTA AERONAUTICAET ASTRONAUTICA SINICA >
A new method of wall profile design for shape-controllable shock wave enhancement
Received date: 2016-01-11
Revised date: 2016-03-08
Online published: 2016-03-21
Supported by
National Natural Science Foundation of China (11132010)
The generation of shape and strength controllable shock wave will offer a special way for ignition and combustion experiments. In this paper, a new method has been proposed for smooth enhancement of a shock wave in a shock tube. With the help of shock dynamics theory, a planar-to-planar shock wave enhancement can be obtained through a convergent channel of specially designed smooth concave-convex wall contour, which bends the planar incoming shock wave into a cylindrical convergent one and then planarizes it and finally forms a strengthened planar shock wave. A typical designed wall profile is verified with both numerical simulation and experimental test. It is found that the agreement of shock wave shape is nearly perfect. Furthermore, the influence of some dominant parameters on the shock enhancement process is analyzed. Compared to the traditional way of increasing pressure ratio in a shock tube, the new method is more efficient to increase plane shock wave intensity. Meanwhile, the influences on wall profile and shock front shape are also performed. When the initial shock is relatively strong, the designed wall profile almost remains the same even though the incoming shock Mach number deviates to some extent, which means that a near-perfect straight shape of shock front can be obtained regardless of unavoidable experimental scatters.
ZHAN Dongwen , YANG Jianting , YANG Jiming , ZHU Yujian . A new method of wall profile design for shape-controllable shock wave enhancement[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016 , 37(8) : 2408 -2416 . DOI: 10.7527/S1000-6893.2016.0071
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