The mean and the fluctuating

Fig. 2. LDV probe, flow field orientation and the coordinate system.Figure optionsDownload full-size imageDownload as PowerPoint slide
The settling chamber with the primary and the secondary jet fixtures was attached to a steel table using adjustable threaded rods for fine positioning. Measurements consisted of limited Pitot surveys for the determination of exit velocities, monitoring of pressures and detailed measurements using two-component Laser Doppler Velocimeter. Key features of the LDV system are described below.
2.1. LDV system
The LDV system included on-table optics, data acquisition and KX2-391 units, and the LDV probes. Details of the LDV system used in the current research can be found in Esirgemez et al. [17] and only key features are discussed.
The laser beams were oriented to measure the U and the V components, separately. While the un-shifted beam and the 50 MHz shifted beams were used to measure the U, the un-shifted beam and the 70 Hz shifted beams were used to measure the V component of the velocity. The beams were aligned such Archaebacteria the axis perpendicular to the bisector of the 0 and 50 MHz shifted beams was oriented along the x axis, while the axis perpendicular to the bisector of the 0 and 70 MHz beams was oriented along the y axis.