Bcac/IAR Collaborative Research Program to Investigate the Sidewall BoundaryLayer Effects in the IAR/NRC 2-D High Reynolds Number Test Facility

摘要

The Institute of Aerospace Research (IAR) and the Boeing Commercial AirplaneCompany (BOAC) formulated a collaborative wind tunnel program to investigate the degree of sidewall boundary layer effects by investigations on 2-D airfoil models with different aspect ratios. The first part of the plan was to examine sidewall boundary layer effects in the IAR 2-D High Reynolds Number Test Facility by acquiring data for three different airfoil models all with the same airfoil section but each with different chord lengths to provide three different aspect configurations. Secondly, another model with the same airfoil cross section and a chord length equal to that of the largest of the three earlier models but with a longer span is to be installed in the 3-D transonic test section of the IAR Blowdown Wind Tunnel as a 2-D model. The ranges of these chord and span dimensions are chosen to represent a fairly wide spectrum of model sizes and the results may determine the best size range for 2-D models to be tested in the IAR facility with minimal sidewall boundary layer effects. The tests of the three smaller models at the 2-D facility have been completed and this report presents the results from these investigations.