Home The Institute of Space and Astronautical Science Report Experimental Studies on Characteristics of Shock Wave Propagation through Cylinder Array

2. 2 Test Section

The configuration of the test section is shown in Fig. 3. The test section is the channel with 46.7 mm square cross section. The length is 965 mm. It has the cylinder array mount, eight static pressure ports and ten schlieren windows. The pressure ports are numbered # 1 , # 2, ... , # 8 from the upstream as shown in the figure. The pressure ports # 1, 2, 6 and 8 are located on the ceiling of the test section. The others are on the side wall. Cylinders are set with their axes normal to the side wall. The high frequency quartz pressure transducer (PCB® Piezotronics Model 113A26) is mounted flush on each pressure port. The signal of the pressure transducer is recorded by the digital oscilloscope. Due to the limitation of the channels available on the oscilloscope, four ports are selected for the pressure measurement at a single shot of the shock tube.

Fig.3.Configuration of Test Section

Figure 4 shows the viewing directions of the schlieren picture. In the test section, five viewing directions (A-E) are available. The shock-induced flow field in the upstream, center, downstream of the cylinder array is visualized using these windows. The flow visualization system is shown in Fig. 5. When the pressure rise due to the incident shock wave is detected at port # 1 , the trigger signal is sent to the camera controller after some delay time which is controlled by the digital retarder. The image is recorded by the high speed CCD camera with the image intensifier (NAC DiCAM-2). The shutter speed is set as 1 /sec. In such short duration, the shock wave seems almost stationary.

Fig.4.Viewing Windows for Schlieren Picture

Fig.5.Flow Visualization System

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Home The Institute of Space and Astronautical Science Report Experimental Studies on Characteristics of Shock Wave Propagation through Cylinder Array