A Study of Wall Jets and Tangentially Blown Wings
Abstract
A study of transonic wall jets and tangentially blown wings has been performed by using asymptotic and computational methods. For the portion of the effort dealing with wall jets, both submerged and coflowing cases have been investigated. For the submerged configurations, the nature of the decay process for disturbances emanating from the jet exit has been examined. In this analysis, the Kutta condition on the nozzle rim can be satisfied merely by requiring streamwise continuity of the potential across the rim as a trailing edge for the flow. With this model, the slip line boundaries create an exponential damped sinusoidal relaxation of the disturbances as compared to algebraic decay for analogous unconfined flows. A similar observation applies to wind tunnel far fields. The nonlinear case differs from the linear one in that the amplitude of the downstream propagated disturbance interacts nonlinearly with the near field in the former case. For these wall jets, acceleration to criticality is accomplished by stream tube contractions and throats induced by upstream influence of the turning. In the coflowing case. selection rules defining various jet flow regimes in terms of the jet transonic similarity parameter and pressure level are given. Conditions are prescribed which define the penetration length for supersonic disturbances downstream from the exit as well as the location of the throats in the jet. The critically of the flow far downstream is also quantified in terms of these parameters.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1981
- Accession Number
- ADA106986
Entities
People
- J. D. Cole
- N. D. Malmuth
- W. D. Murphy