Browse Topic: Seals and gaskets
A rotary union was developed and tested that allows for active flow control to be tested on the Army General Rotor Model System (GRMS) Mach scale rotor test stand. The union has a center pass through for the rotor shaft and control links. Three air channels formed by mortised seals allow air transit between the fixed frame and the rotating frame. Each channel can move 10 SCFM at 30 psi with a pressure loss of 0.2 psi. The union torque depends on seal differential pressure. The torque is 11 lbf-ft at 11 psi or 2.5 HP at 1250 RPM which is sufficient for a rotor tip Mach of 0.64. The union was tested on GRMS to 1250 RPM. The seals require differential pressure of 2 psid to engage and at 10 psid the leak rate was less than 0.5 SCFM. Considering future research, a non-dimensional flow control scaling parameter is derived which accounts for Coriolis effects.
ABSTRACT
The purpose of this aerospace information report is to provide a listing of national and international metric standards for use in aerospace fluid systems with their equivalent SAE inch, International ISO, and European AECMA standards.
This standard is intended to apply to portable compressed gaseous oxygen equipment. When properly configured, this equipment is used either for the administration of supplemental oxygen, first aid oxygen or smoke protection to one or more occupants of either private or commercial transport aircraft. This standard is applicable to the following types of portable oxygen equipment: a Continuous flow 1 Pre-set 2 Adjustable 3 Automatic b Demand flow 1 Straight-demand 2 Diluter-demand 3 Pressure-demand c Combination continuous flow and demand flow.
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