Arrangement of measuring points and sampling frequency

In order to understand the profile of the pressure fluctuation over the volumetric space inside the reactor, multipoint measurement is carried out in each run with five probes. The measuring points are arranged according to the coordinate system shown in Fig. 11.3, where the x-z plane is the impingement plane, x-y is the horizontal plane, and y-z the vertical plane the values of the coordinates are in mm. The flow inside the SCISR is considered to have an approximately axial symmetry. For convenience, part of the data are interrelated in a pillar coordinate system, and the radial coordinate, r, is determined by 

The sampling frequency employed is / = 120 kHz, and the number of samples sampled at each measuring point is 132000. To ensure that complete signals can be detected, the frequency-cutting circuit in the instrumentation was turned off throughout all the measurements. 

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