Accession Number:

ADA200080

Title:

Tip Sensor Development

Descriptive Note:

Final rept. Jul 1987-Jan 1988

Corporate Author:

VATELL CORP CHRISTIANSBURG VA

Personal Author(s):

Report Date:

1988-10-01

Pagination or Media Count:

44.0

Abstract:

Turbomachinery blade clearance and time of arrival sensors based on the Vatell eddy current principle, and suitable for operation at temperatures up to 200 degrees C, were designed, built and tested on the first fan stage of a JT15-D. The sensors produced robust, low noise signals whose general shape is virtually independent of speed, and whose amplitudes are related to speed and clearance. The signals of individual blades were readily resolved and identified. A model equation which predicts sensor signal amplitude, given values of clearance and speed, was developed, and coefficients derived to fit the experimental data. The engine was equipped with an optical oncerevolution sensor.

Subject Categories:

  • Test Facilities, Equipment and Methods
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE