10. Semi-Empirical Evaluation of External Acoustic Loads in Payload Area during Lift-off

10. Semi-Empirical Evaluation of External Acoustic Loads in Payload Area during Lift-off

Batutina T. Y., Bondar’ D. S., Grinchenko V. T., Oliynyk V. N.

Yangel Yuzhnoye State Design Office, Dnipro, Ukraine. Institute of Hydromechanics, Kyiv, Ukraine.

Kosm. teh. Raket. vooruž. 2019, (1); 72-75
 
Language: Russian
Annotation:
The semi-empirical technique of evaluation of external acoustic loads during lift-off is a modification of the known NASA SP-8072 technique based on empirically determined universal dependencies of jet section acoustic power on normalized coordinate and frequency (Strouhal number). The proposed technique was updated in respect of evaluation of mechano-acoustic effectiveness of supersonic jet, determination of spatial scale of sound generating zone in jet, and formation of sound radiation direction towards rocket’s head module. A detailed presentation of the sequence of solving the task set is provided. A comparative analysis of the NASA SP-8072 technique and the proposed modification is made.
Key words: LV lift-off, supersonic jet, sound generation, sound generating zone scale, sound waves direction.

Bibliography:

1. Eldred K. M. Acoustic loads generated by the propulsion system / K. M. Eldred. NASA SP-8072, 1971. 49 p.
2. Koudriavtsev V. A simplified model of jet aerodynamics and acoustics / V. Koudriavtsev, J. Varnier, A. Safronov // 10th AIAA/CEAS Aeroacoust. Conf. AIAA Pap. 2004-2877, 2004. 13 p.https://doi.org/10.2514/6.2004-2877
3. Haynes J. Modifications to the NASA SP-8072 Distributed Source Method II for Ares I lift-off environment predictions / J. Haynes, J. Kenny // 15th AIAA/CEAS Aeroacoust. Conf. AIAA Pap. 2009-3160, 2009. 12 p.https://doi.org/10.2514/6.2009-3160

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