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首页> 美国政府科技报告 >Generation of Higher Levels of Turbulence in the Test Section of the High Speed Cascade Wind Tunnel at Brunswick for Simulation of Turbomachinery Conditions
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Generation of Higher Levels of Turbulence in the Test Section of the High Speed Cascade Wind Tunnel at Brunswick for Simulation of Turbomachinery Conditions

机译：在不伦瑞克高速梯级风洞试验段产生更高水平的湍流以模拟涡轮机械条件

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The flow through a turbomachine is characterized by strong turbulence. Periodic velocity changes are superposed by stochastic velocity fluctuations, and the degree of turbulence achieves values up to 20%. Similar turbulence should be simulated at the investigation of cascades in the wind tunnel. For this purpose, turbulence was generated by grids of crossed bars in a high speed cascade wind tunnel. Now a turbine cascade can be investigated at its design point with a degree of turbulence of Tu sub 1 0.8%, 3.1%, 5.6%, and 7.9% defined in the cascade inlet plane. Considerably higher values are achieved only in the case of increasing inhomogeneous distribution of dynamic head and turbulence across the test section.

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