Dynamic Pressure Measurement

 

Four dynamic pressure transducers (DPT) are installed at critical locations throughout the HPGSB and HPOC in order to adequately characterize flame dynamics and acoustic response within the system. The four locations are designated as “Plenum” with the DPT measurement location at the fuel/air inlet to the HPGSB-2, “Pilot” with the DPT measurement location within the instrumented pilot lance, “Burner Face” with the DPT measurement location in the same axial plane as the “Pilot” DPT within the combustor, and finally “Exhaust” with the DPT measurement location at the exit of the quartz confinement tube. Each DPT was separated from the measurement location by an impulse line of 980 mm length.

Each DPT utilizes a semi-infinite tubing connection made from 3 mm × 10 m (D × L) copper tubing capped at one end for attenuation of reflected acoustic waves. The “Plenum”, “Pilot”, and “Burner Face” DPTs are PCB 113B28 with 500 kHz resonant frequency, 14.5 mV/kPa sensitivity, and 0–350 kPa range. The “Exhaust” DPT is a PCB 112A22 with 250 kHz resonant frequency, 14.5 mV/kPa sensitivity, and 0–350 kPa range. Each DPT was connected via low noise coaxial cable to a PCB 482C05 signal conditioner, and output voltages are measured via a dedicated National Instruments DAQ (PXI-6123) and processed in a bespoke NI LabVIEW program.

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