Performance and Evaluation of an X Hot Wire Sensor in a Two-Dimensional Free Jet in the Presence of Cross Flow Component
Abstract
This thesis reports the results of an experimental investigation of rotation tests conducted with two X wire sensor arrangements in the potentical core of a free jet and the influence of small temperature variations on the linearized response of a hot wire sensor. The tests were performed in the free jet issuing from a 10 cm x1cm nozzle having turbulence intensity of 0.3% at the exit plane. The two X wire sensors used were TSI Models 1240 and 1241. Each sensor arrangement consisted of two platinum coated, tungsten wires, having 3.81 micron diameter, active sensor length 1.25 mm and separated by 1 mm. The tests were conducted at Reynolds Numbers of 7.2, 14.54 and 21.8, based upon wire diameter. Investigation showed that both X sensors had a strong preference for the direction of mean motion, and the error due to misalignment in yaw was largest at very small misalignment angles. The Model 1240 showed insensitivity to misalignment in pitch in the upper range of Reynolds number but Model 1241 was highly sensitive to misalignment in pitch. In the 2nd part of the study, air temperature was increased from 4F to 20F above the reference and its influence on the linearized response of the upstream sensor of Model 1240 was observed. Test results showed a strong influence of the variations in air temperature on the linearized sensor response at velocities below approximately 100 ft/sec.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1976
- Accession Number
- ADA034271
Entities
People
- Fazal B. Kauser
Organizations
- Air Force Institute of Technology