AN INVESTIGATION AND CALIBRATION OF A DEVICE FOR THE GENERATION OF TURBULENT FLOW AT THE INLET OF A TURBOJET ENGINE
ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
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An investigation and calibration of a device consisting of an airflow metering venturi with a variable position aerodynamic centerbody for the production of turbulent flow at the inlet of a turbojet engine was conducted in an altitude test cell. The device provided turbulent flow conditions by producing showk-wave systems of variable severity. Turbulence and distortion values were obtained at the front face of a simulated turbojet engine compressor inlet located slightly downstream of the turbulence producing device. Various screen configurations with area blockages of from zero to 70 percent were inserted between the device and the simulator front face, and their effect on distortion and turbulence characteristics at several different corrected airflow settings was determined. Wave analysis techniques were applied to the turbulent pressure data, and the effects on turbulence of Reynolds number, corrected airflow, centerbody position, and screen configuration were determined. Values of peak-to-peak turbulent pressure amplitude up to 28.4 0- to 50-cps bandwidth and 57.0 0- to 600-cps bandwidth percent of the steady-state total pressure level were obtained with total pressure distortion values up to 52. An airflow coefficient for the turbulence generating device and the structural integrity of the apparatus were also determined.
- Jet and Gas Turbine Engines