【Key words】 Sinuous cylinder； marine riser； VIV suppression； flow field parameter； surface feature；
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风洞流场参数—总压、马赫数之间存在严重的耦合关系。
There exist a close coupling relation between the wind tunnel flow field parameters, total pressure and Mach number.
这为流场参数的控制和机头结构的优化设计和改进提供了理论依据。
This presented the theory for the optimization design and improvement of the control of flow filed parameters and head structure.
对上游进口段，特别是靠近叶片前缘区域流场参数分布有较大影响，但对于上游叶片表面马赫数影响不大。
The flow field parameter distribution can be affected more in upper stream, especially near the leading edge area while the Mach number distribution of the upstream blade surface is affected little.
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