EQUIPMENT AND TECHNIQUES FOR MAKING PRESSURE MEASUREMENTS IN SUPERSONIC WIND TUNNELS AT MACH NUMBERS UP TO 5
NAVAL ORDNANCE LAB WHITE OAK MD
Pagination or Media Count:
Equipment and techniques are described which were developed for use in the Intermittent Supersonic Wind Tunnel for measuring pressures where the stabilization time is very important. The equipment consists principally of a manometer bank of 72 tubes with necessary valves, vacuum reference systems, special illumination which makes it possible to read meniscus positions with an accuracy of better than 0.004 in., cameras for photographic registration, control equipment which makes semiautomatic operation possible, and a negative reader for taking data off the negatives. Procedures are given for determining the dimensions of tubes running from the model to the pressure-measuring equipment so that stabilization times will be equal to or shorter than the allowable blowing times. The theoretical basis for the procedure is given by Kendall NOLM 10677, May 1950. An actual example of determining tube dimensions is worked out to illustrate the use of the procedure.