Small Altitude Simulation System (400 Area)

    For the Small Altitude Simulation System (SASS) in the 400 Area at WSTF, three boilers power small two-stage ejector sets of the altitude simulation system. Optimization of the entire steam system to engine requirements is achieved by the configuration of the number of boilers fired, the selection of the ejector combination, and the interchangeable diffusers.

    Altitude Capability:

    • Provides a start altitude of ~ 35,000 m (115,000 ft)
    • Maintains Test Stands 401, 403, or 405 at > 30,500 m (100,000 ft) during rocket engine firing up to 4.4 kN (1,000 lbf) for up to 8 h

    Steam Generation:

    • Three 7.8 MW (800 Bhp) fuel-oil fired boilers
    • Produce ~ 6.8 kg/s (15 lb/s), 1.7 MPa (250 psig), 204 °C (400 °F) steam

    Steam Ejectors:

    • Two ejectors are located on the 400 Area 61-cm (24-in.) vacuum header
    • Can be operated singly or in parallel
    • Large set consumes 4.5 kg/s (10 lb/s) steam
    • Small set consumes 2.3 kg/s (5 lb/s) steam

    Diffuser Sizes Currently Available:

    • 33.7 cm (13.25 in.) horizontal (1)
    • 43.8 cm (17.25 in.) vertical or horizontal (1)

    Mechanical Vacuum Pumps:

    • Oil-sealed rotary mechanical pumps, Roots® blower
    • Maintains Test Stands 401, 403, or 405 at > 45,700 m (150,000 ft) during test article coast periods
    • Can be used stand-alone for short duration firings
    • Each set delivers up to 127 m3/s (4,500 ft3/s)
    • 61-cm (24-in.) diameter vacuum header provides interconnect option for 400 Area test stands to manifold all four sets together with any selected altitude test stand.

    For additional information, contact David L. Baker, Chief, Propulsion Test Office, (575) 524-5605, or Kevin Farrah, Altitude Simulation Systems Manager, (575) 524-5160.