Journal of Astronautics ›› 2019, Vol. 40 ›› Issue (8): 908-917.doi: 10.3873/j.issn.1000-1328.2019.08.007

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Experiment of Hypersonic Boundary Layer Transition on a Cone with Axisymmetric Step

XU Xi wang, YI Shi he, ZHANG Feng, XIONG Hao xi, SHI Yang   

  1. College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410005, China
  • Received:2019-01-17 Revised:2019-05-12 Online:2019-08-15 Published:2019-08-25


The problem of boundary layer transition on a cone with forward or backward axisymmetric step is investigated in the hypersonic wind tunnel, through the high frequency fluctuation pressure test technique and the nanoparticle-tracer planar laser scattering (NPLS) technique. The fluctuation pressure data is analyzed by the analysis of power spectrum density and cross-correlation calculation. The development of the disturbance waves in the boundary layer is obtained, and the relevant parameters of the second-mode wave are analyzed quantitatively. The results show that, the amplitude of the second-mode wave increases first and then decays downstream along the flow direction. But the characteristic frequency of the second-mode waves are gradually reduced. The characteristic frequency and propagation velocity of the second-mode wave increase with the increase of the Reynolds number (the characteristic frequency in the backward-step model increases from 100 kHz to 196 kHz, and it increases from 97 kHz to 174 kHz in the forward-step model). However, the wavelength is reversed (the wavelength in the backward-step model reduces from 6.35 mm to 4.54 mm , and it reduces from 7.35 mm to 4.66 mm in the forward-step model). The second-mode wave in the backward-step model appears closer to the upstream than in the forward-step model, and the boundary layer transition position is forwarder than the forward-step model. The NPLS results are compared with the fluctuation pressure results, which leads to a good agreement.

Key words: Cone, Axisymmetric step, Second mode, Hypersonic boundary layer, High frequency fluctuation pressure

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