开口试验段优化设计数值模拟

摘要：
为提高某低速风洞开口试验段流场品质，采用计算流体力学方法，结合适当的边界条件，对不同设计方案进行了模拟.数值模拟结果显示：采用集气扩散段能有效提高开口试验段流场均匀性；在试验段入口前加装蜂窝器和阻尼网，对提高试验段流场均匀性和方向场、降低湍流度有重要作用.对试验段尺寸与收集器设计的进一步研究表明，延长试验段前入口区长度、增大试验段口径、改变集气扩散段位置与尺寸都能够有效提高模型区流场品质.通过比较，得出了较为合理的匹配参数，流场指标达到了设计要求.
关键词：
低速； 风洞； 开口试验段； 流场特性； 数值模拟； 优化设计
中图分类号： V 211.3
文献标志码： A

Numerical Investigation about Optimal Design of Open-Jet Rectangular Test Section in Low Speed Wind Tunnel

In order improve flow quality of the specific open-jet test section, the design technology of a certainlow speed wind tunnel open-jet test section was studied using computational fluid dynamics (CFD). It presents the control equations and boundary conditions for numerical simulation. Then the details of numerical results about the different configurations were given. Comparing with full open-jet test section, the velocity uniformity of model region is evidently improved by use of collector. Honeycomb and screens have profound function on the velocity field such as uniformity, direction field and turbulence level. Further investigation on the size of test section and collector indicates that the flow quality of model region is significantly improved when several measures are implemented such as extending the entrance length before test section, increasing the test section caliber and the changing location and size of the collector. Combination of satisfactory parameters, which can produce a more uniform velocity profile to arrive at the expected level, was obtained based on numerical results.