Abstract
The turbulent flow which results when a circular jet issues into a crosswind is a noise source which is encountered during take-off and landing of certain types of V/STOL aircraft. The acoustic intensity of the noise from this flow is calculated by extending the freejet model of Ribner 1'2 to those crosswind jets for which the ratio of jet velocity to crosswind velocity is between 6 and 10. The extended model accounts for the non-circular cross section, the shortened potential core region, and the flow characteristics in the initial mixing region of the crosswind jet. The result of this analysis is an expression for the directivity function of the acoustic intensity from a crosswind jet of a V/STOL aircraft in flight. The maximum acoustic intensity is calculated to be in a direction which is slightly forward of the sidelines direction.
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