Airplane wind tunnel test wall presents outer and spaced inner acoustic walls and air entry and outlet with specified vertical and horizontal interval values for two-leaf door design.

摘要

The tunnel wall presents an outer acoustic wall (23) from base (21) to top edge (31) with vertical height (a) plus an outer acoustic wall (24) with bottom edge (33) to reach up at distance (b) from the base (21) to a vertical height (c). Wall (24) is offset from wall (23) by horizontal distance (d) and the air feed channel (28) is bounded by wall (23), base (21) and the lower part (29) of wall (24). The channel has an open air entry (30) formed between the top wall (23) edge (31) and the inner wall (24) and the air outlet (32) lies below the bottom edge (33) of wall (24). The wall is fixed and makes door leaves and the vertical height (a) appreciably extends the vertical interval (b) which is equal to the distance (d) so that (b) and (c) together exceed (a). The vertical distance (b) lies between 4 and 6 m as does the horizontal distance (d) so that there is 2 m difference between (a) and (b).