2009 Version of the Aeroprediction Code: AP09

Autor: Frank G. Moore, Linda Y. Moore
Rok vydání: 2008
Předmět:
Zdroj: Journal of Spacecraft and Rockets. 45:677-690
ISSN: 1533-6794
0022-4650
DOI: 10.2514/1.35703
Popis: The 2005 version of the Aeroprediction Code (AP05) was evaluated when applied to configurations with boattails. Results of the evaluation indicated the AP05 predictions for normal force, center of pressure, and pitch and roll damping moments needed improvement. As a result, new and improved methods were developed and incorporated into the AP05 to be released as the AP09. Improvements include body-alone lift characteristics for Mach numbers less than two, low angle-of-attack improvements for roll and pitch damping for configurations with long boattails, incorporation of an improvedboundary-layer displacementmodel, and refinement of several other existingmethods. In addition, new methods were developed to predict nonlinear roll and pitch damping. Comparing the new and improved methods to existing experimental data indicated significant improvements in roll and pitch damping, normal force, and center of pressure predictions compared to the AP05. However, validation of the AP09 code was not as complete as desired due to limited generic nonlinear roll and pitch damping data. Also, most of the available nonlinear dynamic derivative data have larger thandesired accuracy boundaries due tomodel sting andwind-tunnel wall interference issues. The AP09 also calculates static margin based on tangent (derivative of normal force at a given angle of attack) as well as secant slope (value of normal force over sine of the angle of attack) values of normal force and pitchingmoment coefficients.Weapons affectedmost by the newAP09methodology aremortars, low-drag bombs, and projectiles, in that order. However, the nonlinear dynamic derivative predictions affect all weapons. The AP09 is thus the most accurate and robust of the Aeroprediction Codes to date.
Databáze: OpenAIRE
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