Measurements of Minute Unsteady Pressure on Three-Dimensional Fan with Arbitrary Axis Direction

Abstract

The present study is a fundamental approach to develop the measuring technology for minute fluctuating pressures on the three-dimensional blade surfaces of the fan which rotates with an arbitrary rotation-axis direction. In this situation, we are required to correct the centrifugal-force effect, the gravitational-force effect and the other leading-error effects for accurate measurements of the minute pressures. The working fluid is air. A pressure transducer rotating with an arbitrary attitude is closely sealed by a twofold shroud system. The rotational motion with an arbitrary attitude is produced by fixing the pressure transducer to the cantilever which is connected to a motor-driven disc of 500mm in diameter and 5mm in thickness. As a result, we have quantitatively determined main governing effects upon the non-effective component of the pressure-transducer signal.

Research on the Effect of Vibrational Micro-Displacement of an Astronomical Camera on Detector Imaging

“…The low-temperature gases in the cycle are convectively exchanged inside the camera and at the back end of the TE cooler to lower the temperature of the TE cooler. The fan blades are subjected to large aerodynamic forces generated by the action of airflow in a high-speed rotating operating environment [11], and the aerodynamic loads on the blades can be expressed as follows:…”

“…blades are subjected to large aerodynamic forces generated by the action of airfl high-speed rotating operating environment [11], and the aerodynamic loads on th can be expressed as follows:…”