AEROACOUSTIC INSTABILITY IN ROCKETS - UTSI

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EVOLUTION OF MOTOR L<strong>IN</strong>EARSTABILITY PREDICTION ANALYSIS• Basic Energy Balance Analysis, McClure, et al., 1959,1964 (time-evolution of acoustic energy only)• Perturbed Acoustic Wave Method, Culick, 1966, 1970,1973 (acoustic energy only, flow-turning in one-D case)• Rotational Flow Corrections to Culick Model, Flandro,Cai and Yang, 1995, 2000 (acoustic energy only, somerotational corrections, turbulent mean flow)• Full Acoustic/Rotational System Analysis, Flandro andMajdalani, 2001 (time-evolution of full system kineticenergy, all rotational corrections included, turbulentmean flow)
WHY A NEW ANALYSIS ISNEEDED• Acoustic model is correct only if waves impingenormally on burning surface - current model isappropriate for T-burner, L*-burner, end-burningmotors, etc.• Current models (e.g. SSPP) do not correctlypredict linear behavior of systems with parallelwave incidence (sometimes attributed to the“velocity coupling” effect)• It is not sufficient to add rotational corrections tothe basic analysis, which accounts only for theevolution of irrotational (acoustic) waves
Page 1: AEROACOUSTICINSTABILITY IN ROCKETSG
Page 5 and 6: County /LanguageCOBBSpanishP.O. Box
Page 10 and 11: ASSUMPTIONS• Linearized model com
Page 12: COORDINATE SYSTEM
Page 17: SOLUTIONS FOR CYLINDRICALCOMBUSTION
Page 20 and 21: ONERA COLD FLOW RESULTSAvalon and C
Page 23: PARTS OF THE SYSTEMKINETIC ENERGYDi
Page 31 and 32: COMPARISON OF NEW RESULTS TO SSPPA
Page 33: CONCLUSIONS• A new energy source

AEROACOUSTIC INSTABILITY IN ROCKETS - UTSI

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