测试驻退机湍流速度场的目的是逐步揭示驻退机内湍流流场的结构和特点，为驻退机的设计和改进提供一些有益的参考。

The object of measuring velocity distribution is to show the characteristics of turbulent flow velocity field in recoil mechanism, so as to make some Suggestions for the design of recoil mechanism.

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采用相多普勒颗粒分析仪(PDPA)测量了雷诺数为8500的两相圆湍射流速度场，研究了两种大粒径颗粒对湍流的调制作用。

Two-phase velocity fields in a round turbulent jet with Reynolds number 8500 were measured by phase Doppler Particle Analyzer (PDPA).

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