Poppet Valve Control of Throat Stability Bypass to Increase Stable Airflow Range of a Mach 2.5. Inlet with 60 Percent Internal Contraction

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National Aeronautics and Space Administration, 1975 - Jet engines - 46 pages
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The throat of a Mach 2.5 inlet with a coldpipe termination was fitted with a stability-bypass system. System variations included several stability bypass entrance configurations. Poppet valves controlled the bypass airflow. The inlet stable airflow range achieved with each configuration was determined for both steady state conditions and internal pulse transients. Results are compared with those obtained without a stability bypass system. Transient results were also obtained for the inlet with a choke point at the diffuser exit and for the inlet with large and small stability bypass plenum volumes. Poppet valves at the stability bypass exit provided the inlet with a stable airflow range of 20 percent or greater at all static and transient conditions.

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Contents

Section 1
29
Section 2
33
Section 3
34

6 other sections not shown

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