Modernization and expansion of a low-speed wind tunnel

空气动力学主席在TU柏林申请现代化和扩大其现有的翼型风洞。这个风洞（WT）是设计和建造在2000年的二维翼型调查与测量2.0米× 0.4米的横截面和30m/s的最大流速的开始。自2007年以来，小波变换在SFB 557和1029中作为一个开放的二维级联运行。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，将试验段扩大到1.3m x 1.0m (HxW)，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。目前机组运行为2台轴流风机，每台40.000m³/h。用两个流量为80000 m³/h的轴流风机代替。由于容积流量的增加，需要一种由热交换器和冷却装置组成的新型冷却系统。将原有的15kW制冷机组替换为至少输出40kW的机组。由于测试部分的扩大，有必要对WT喷嘴进行新的构造，包括电机集成，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，将采购一个六分量天平，记录瞬态力变化以及绝对力和力矩。例如，为了研究机翼的动态耦合，需要新的动力和力矩测量能力。为此所需的传感器必须具有非常小的响应阈值（mN）和高时间分辨率。为了实现广泛的应用，测量部分将配备由三个驱动电机，三个线性导线和一个控制系统组成的3轴导线系统。该系统将用于遍行不同的测量探头（五孔探头，热线等），并在测量部分定位或移动测试模型。风洞部件，如喷嘴、扩散器、偏转板，只要求材料。这些部件本身可以在研究所自己的车间制造和组装。

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.