Shock oscillation in highly underexpanded jets<xref rid="cpb_27_9_094705fn1" ref-type="fn">*</xref><fn id="cpb_27_9_094705fn1"><label>*</label><p>Project supported by the National Natural Science Foundation of China (Grant No. 11602028) and the Science and Technology Project of General Administration of Quality Supervision Inspection and Quarantine of China (Grant Nos. 2017QK119 and 2017QK188).</p></fn>

Shock oscillation in highly underexpanded jets**

Project supported by the National Natural Science Foundation of China (Grant No. 11602028) and the Science and Technology Project of General Administration of Quality Supervision Inspection and Quarantine of China (Grant Nos. 2017QK119 and 2017QK188).

Li Xiao-Peng^{1, †}, Zhou Rui², Chen Xiao-Ping³, Fan Xue-Jun⁴, Xie Guo-Shan¹

(color online) (a) Time-averaged and (b)–(g) instantaneous density gradient at NPR of 5.60 corresponding to t/t₀ of (b) 468, (c) 470, (d) 472, (e) 474, (f) 476, and (g) 478, with one oscillation cycle.