ANALYTICAL STUDY OF AIR DATA EQUATIONS FOR A HEMISPHERICAL PRESSURE PROBE THROUGH THE HYPERSONIC MACH NUMBER RANGE

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Abstract:

Air data outputs obtainable from pressure measurements on a hemispherical probe were investigated analytically for Mach numbers of 0 to 20 and altitudes from 0 to 300,000 feet. Angles of attack from 50 deg to -20 deg and angles of sideslip up to and - 15 deg are considered using a five orifice probe. Emphasis was placed on the hypersonic regime wherein air data parameters were shown to be obtainable by using a simplified set of pressure relations. Expressions for determining the uncertainties in the air data outputs resulting from both pressure measurement error and simplifying assumptions used in deriving the air data equations are presented. Errors resulting from changes in probe shape due to ablation are also considered. Finally, limitations in deriving air data information with this approach are presented.

Author(s):
Romeo, David J.
Author Organization(s):
CORNELL AERONAUTICAL LAB INC BUFFALO NY
Descriptive Note:
Final rept. Mar 1966-Jun 1967
Pagination:
0107

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
CAL-AA-2217-Y, AFFDL-TR-67-128
Contract/Grant Number(s):
AF 33(615)-3554
Task Number(s):
822207
Project Number(s):
AF-8222
Monitor Series:
TR-67-128, AFFDL
 Subject Terms
Joint Capability Areas:
JCA_3_Force Application; JCA_3.1_Maneuver; JCA_3.1.1_Maneuver to Engage; JCA_3.2_Engagement; JCA_3.2.1_Kinetic Means; JCA_5_Command and Control; JCA_5.3_Planning; JCA_4.5.4_Requirements Definition; JCA_4.5_Operational Contract Support; JCA_8_Building Partnerships; JCA_8.2_Shape; JCA_1_Force Support; JCA_1.3_Human Capital Management; JCA_1.3.2_Personnel Management; JCA_8.1_Communicate; JCA_6.4.1_Secure Information Exchange; JCA_6_Net Centric; JCA_1.2.5_Lessons Learned
Communities of Interest:
Air Platforms
Descriptor(s):
*PRESSURE GAGES, VELOCITY, MATHEMATICAL MODELS, REENTRY VEHICLES, ABLATION, ANGLE OF ATTACK, SPHERES, ERRORS, AERODYNAMIC LOADING, SIDESLIP, MACH NUMBER, EQUATIONS, ALTITUDE, HYPERSONIC AIRCRAFT, BLUNT BODIES, HYPERSONIC FLOW
Field(s)/Group(s):
Flight Control and Instrumentation, Unmanned Spacecraft
Keyword(s):
*HEMISPHERES
Report Date:
1967 Sep 01