Modernization and expansion of a low-speed wind tunnel

低速风洞的现代化和扩建

• 批准号: 491803306
• 金额: --
• 依托单位: Technische Universität Berlin
• 依托单位国家: 德国
• 项目类别: Major Research Instrumentation
• 财政年份: 2021
• 资助国家: 德国
• 起止时间: 2020-12-31 至 无数据
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/491803306?language=en
• 关键词: Modernization; expansion; low; speed; wind

The Chair of Aerodynamics at TU Berlin applies for a modernisation and extension of its existing airfoil wind tunnel. This wind tunnel (WT) was designed and built at the beginning of the 2000’s for two-dimensional airfoil investigations with a measurement cross-section of 2.0m x 0.4m and a maximum flow velocity of 30m/s. Since 2007, the WT has been operated as an open two-dimensional cascade within SFB 557 and 1029. This WT shall now be modified and expanded to cover a broad spectrum of possible experimental configurations in future research projects. For this purpose, the test section will be enlarged to a size of 1.3m x 1.0m (HxW) at a flow velocity of approx. 35m/s. The motor, the control, and the cooling systems will be modified accordingly to accommodate the increased mass flow. At present, the engine unit is operated with two axial fans of 40.000m³/h each. These are to be replaced by two axial fans with a volume flow of 80.000m³/h each. Due to the increased volume flow, a new cooling system consisting of heat exchanger and cooling unit is required. The previous cooling unit of 15kW is to be replaced by a unit with an output of at least 40kW. Due to the enlargement of the test section, a new construction of the WT- nozzle up to and including the motor integration is necessary, though several existing parts will be re-used. Like the previous WT-parts, the new WT structural sections will be largely made of wood and mounted on metal frames. The test section will have additional optical access points to enable two- and three-dimensional flow field measurements, for example with the existing HS-PIV system. In addition, a 6-component balance, with provisions to record transient force changes as well as absolute forces and moments, will be procured. The new capability for dynamic forces and moment measurements is required, for example, in order to investigate the dynamic coupling of two wings. The sensors required for this must have a very small response threshold (mN) and a high temporal resolution. In order to enable a wide range of applications, the measuring section will be equipped with a 3-axis traverse system consisting of three drive motors, three linear traverses and a control system. This system will be used to traverse different measuring probes (five-hole probe, hot-wire, etc) and also to position or move test models in the measuring section. For the wind tunnel components such as nozzle, diffuser, deflectors, only the material is requested. The components themselves can be manufactured and assembled in the institute's own workshop.

柏林工业大学空气动力学系主任申请对其现有翼型风洞进行现代化改造和扩建。该风洞（WT）是在21世纪初设计和建造的，用于二维翼型研究，测量截面为2.0m x 0.4m，最大流速为30 m/s。自2007年以来，WT一直作为SFB 557和1029内的开放二维级联运行。这个WT现在将被修改和扩展，以涵盖未来研究项目中可能的实验配置的广泛范围。为此，试验段将扩大到1.3m x 1.0m（HxW）的尺寸，流速约为35米/秒。电机、控制和冷却系统将相应地进行修改，以适应增加的质量流量。目前，机组采用两台40.000m³/h轴流风机运行。这些将由两台轴流风机代替，每台流量为80.000 m ³/h。由于体积流量增加，需要一个由热交换器和冷却单元组成的新冷却系统。以前的15千瓦冷却装置将被一个输出至少40千瓦的装置所取代。由于试验段的扩大，需要一个新的WT喷管结构，包括发动机的集成，尽管一些现有的部件将被重新使用。像以前的WT部件一样，新的WT结构部分将主要由木材制成，并安装在金属框架上。测试部分将有额外的光学接入点，以实现二维和三维流场测量，例如使用现有的HS-PIV系统。此外，还将采购一个6分量天平，该天平可记录瞬时力变化以及绝对力和力矩。例如，为了研究两个机翼的动态耦合，需要动态力和力矩测量的新能力。为此所需的传感器必须具有非常小的响应阈值（mN）和高的时间分辨率。为了实现广泛的应用，测量部分将配备一个由三个驱动电机、三个线性横移和一个控制系统组成的三轴横移系统。该系统将用于移动不同的测量探头（五孔探头、热线等），并在测量部分定位或移动测试模型。对于风洞部件，如喷管、扩压器、导流板，仅要求材料。部件本身可以在研究所自己的车间制造和组装。