声学风洞的设计

介绍声学风洞设计理论，重点阐述流场和声场以及声学测量中值得注意的一些问题，包括；声学风洞的定义；低速声学风洞和高速声学风洞的特点，关于设计方法；全新声学风洞的设计和常规风洞改造成声学风洞，设计遇到的声折射、声散射、流动振荡，消声大厅的回流，频率范围以及风扇叶片的失速问题；试验段的霍尔数以及提高霍尔数的方法；风洞消声器及降低风洞背景噪声的方法。本文还以ＮＨ－２风洞为例，简单讨论了常规风洞改造成声学风

The Design of Acoustic Wind Tunnel

The design theory of acoustic wind tunnels is introduced in this paper. Some considerable problems about fluid field, sound field and acoustrcal measurements are presented. The paper includes: 1. how to define the acoustic wind tunnels; 2.The feature about acoustic wind tunnels with low speed and high speedl 3.desigh rnethods: the new design with acoustic idea or transforming regular wind tunnel to acoustic wind tunnell 4. refracts, scatters, open jet oscillations, recirculation flow in the acoustic hall,frequency range, and fan stall in designl 5.Holl number in the test section and the methods increasing it; 6.the rnufflers of wind tunnel and the methods decreasing background noise in wind tunnels. As a samp1es, we discuss some opinion transforming NH-2 wind tunnel to acoustic wind tunnel in this paper.