Control of normal shock wave / turbulent boundary-layer interaction using streamwise slots

The effect of streamwise slots on the interaction of a normal shock wave / turbulent boundary layer has been investigated experimentally at a Mach number of 1.3. The surface pressure distribution for the controlled interaction was found to be significantly smeared, featuring a distinct plateau. This was due to a change in shock structure from a typical unseparated normal shock wave boundary layer interaction to a large bifurcated Lambda type shock pattern. Boundary layer velocity measurements downstream of the slots revealed a strong spanwise variation of boundary layer properties whereas the modified shock structure was relatively twodimensional. Oil flow visualisation indicated that in the presence of slots the boundary layer surface flow was highly three dimensional and confirmed that the effect of slots was mainly due to suction and blowing similar to that for passive control with uniform surface ventilation. Three hole probe measurements confirmed that the boundary layer was three dimensional and that the slots introduced vortical motion into the flowfield. Results indicate that when applied to an aerofoil, the control device has the potential to reduce wave drag while incurring only small viscous penalties. The introduction of streamwise vorticity may also be beneficial to delay trailing edge separation and the device is thought to be capable of postponing buffet onset. © 2001 by A N Smith

The organizational environment with its measures, antecedents, and consequences: A review and research agenda

The organizational environment is a focal element of multifaceted managerial decisions. Consequently, research has shown a long lasting and still growing interest in investigating the organizational environment and understanding its impact on a firm. Because it is widely assumed that the business environment will become more dynamic, changes in the organizational environment have drawn the particular attention of many scholars. While the extant research has established valuable knowledge, its fragmentation due to differing definitions and contradictory findings calls for a broad review to establish a foundation for future research. By analyzing 279 studies that have investigated different aspects of the organizational environment between 1958 and mid-2017, we contribute to various research streams that involve this environmental factor. We use a comprehensive research framework to categorize and review the previous work. In particular, we distinguish between studies that define or measure the organizational environment, as well as studies that investigate antecedents, outcomes, and moderating effects of the organizational environments. Among those categories, we discuss our findings, before subsequently synthesizing existing works and deriving an agenda for future research