B-47 Refueling Receptacle
The Air Force was disappointed with the combat radius of the early B-47s (1,708 nautical miles). Various changes in later versions of the bomber increased that to 2,050 nautical miles, but it was still a far cry from the 3,465 nautical mile combat radius of the latest B-36s. From the beginning of the B-47 program, the Strategic Air Command recognized the necessity of developing in-flight refueling for the bomber.
All but the earliest operational B-47s were equipped with single-point refueling receptacle, with ground fueling and aerial refueling using a single opening. This receptacle was located on the starboard side of the nose, behind a door which swung open in flight:
Here's a screen capture showing a KC-97 as it prepares to refuel a B-47, the former's boom almost in position to initiate fuel transfer: