On the basic phenomena of acoustic wave generation and dynamics in compressible shear flows
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Besonders bei der Auslegung von Flugzeugtriebwerken machen es L�rmverordnungen und geltende Anforderungen an die Luftt�chtigkeit unm�glich, aeroakustische Eigenschaften zu vernachl�ssigen. Hier setzt die vorliegende Arbeit an und untersucht aerodynamische Ger�uschgenerierung und -ausbreitung in modellierten, ingenieurwissenschaftlich relevanten Scherstr�mungen. Bislang ist keines der beiden Ph�nomene vollst�ndig verstanden, obwohl Bereiche mit (konstanter) Schergeschwindigkeit allgegenw�rtig sind. Die Analyse des zeitlichen Verhaltens von St�rungen mit kleiner Amplitude erm�glicht das fundamentale Verstehen aeroakustischer Ph�nomene. Hierdurch wird der einzige lineare Mechanismus der akustischen Wellenentstehung in Scherstr�mungen in zwei und drei Dimensionen identifiziert. Die spektrale Anisotropie dieses linearen Mechanismus f�hrt zu �u erst direktionaler Ger�uschabstrahlung. Die Klassifizierung aller linearen und nichtlinearen Prozesse, die an der akustischen Wellenentstehung und -ausbreitung beteiligt sind, und der Vergleich ihrer Effektivit�t auf Basis direkter numerischer Simulationen, zeigen die Dominanz der linearen Mechanismen und damit ihre Relevanz. Nichtsdestotrotz bleiben diese im Quellterm der akustischen Analogie, die in Lighthills grundlegenden Ver�ffentlichungen aufgestellt wurde, und deren Erweiterungen unber�cksichtigt. Die in dieser Arbeit entwickelte Theorie erlaubt es, �u erst direktionale Ger�uschabstrahlung und deren weitere Fortpflanzung in ingenieurwissenschaftlich relevanten Scherstr�mungen zu erkl�ren.
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