Heating-Rate Measurements over 30 deg and 40 deg (Half-Angle) Blunt Cones in Air and Helium in the Langley Expansion Tube Facility,
INDIAN INST OF SCIENCE BANGALORE DEPT OF AERONAUTICAL ENGINEERING
Pagination or Media Count:
Convective heat-transfer measurements were made on the conical portion of spherically blunted cones 30 deg and 40 deg half angle in the Langley expansion tube. The test gases used were helium and air flow velocities were about 6.8 kmsec for helium and about 5.1 kmsec for air. The measured heating rates were compared with calculated results using a viscous shock-layer computer code. For air, various techniques to determine flow velocity yielded nearly identical results, but for helium the flow velocity varied by as much as 8 depending on which technique was used. The measured heating rates were in satisfactory agreement with calculation for helium test gas if the higher flow velocity was used, but for air and for helium assuming the lower flow velocity, the measurements were significantly greater than theory and the discrepancy increased with increasing distance along the cone.