风量试验台在不同送风方式下整流效果分析

Rectification effects of orifice plate unit in the air volume testing equipment at two typed-sending

采用三维N-S方程和标准k-ε方程模型对自行设计的风量试验台的多层孔板整流装置在两种送风方式(侧送/上送)下的整流效果进行了数值分析,结果表明转弯处分离流动堵塞了测量流道,并进一步影响到通过整流装置后相对喷嘴的来流均匀性,最终影响了上送风方式测量精度.通过对采用两种送风方式整流效果的比较,探讨了试验台多层孔板整流装置加速主流、耗散涡流的整流机制.研究结果为类似的外特性性能试验台的设计及精度评估,提供了依据和参考.

The rectification effect of orifice plate unit in the self designed air volume test apparatus at two kinds of send （the side send/ the up send） was simulated numerically based on three-dimensional Navier-Stokes （N-S） equations coupled with standard k-ε turbulence model. The result indicates that the separating flow at the turning jams the measuring flow passage and affects the coming flow uni- formity relative to the nozzles, at last affects the measurement accuracy of the equipment at the up send. Through comparing the rectification effect at two kinds of sending, the rectification mechanism that the orifice plate unit accelerates mainstream and dissipates vortex is discussed. The thesis aims to make a contribution for designing the similar external characteristics service test and further evaluating the equipment precision.