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Digital-computer normal shock position and restart control of a Mach 2.5 axisymmetric mixed-compression inlet (1972)

Arpasi, D. J. ; Cole, G. L. ; Neiner, G. H.

In: CASI

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Publication Date: 2019-06-27

Description: Digital computer control of a mixed-compression inlet is discussed. The inlet was terminated with a choked orifice at the compressor face station to dynamically simulate a turbojet engine. Inlet diffuser exit airflow disturbances were used. A digital version of a previously tested analog control system was used for both normal shock and restart control. Digital computer algorithms were derived using z-transform and finite difference methods. Using a sample rate of 1000 samples per second, the digital normal shock and restart controls essentially duplicated the inlet analog computer control results. At a sample rate of 100 samples per second, the control system performed adequately but was less stable.

Keywords: PROPULSION SYSTEMS

Type: NASA-TN-D-6880 , E-6498

Format: application/pdf

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