A Hybrid Computer Model for a Rotating Stator Compressor Test Rig. (Simulation, sur Ordinateur Hybride, d'un Bati d'Essai Tournant pour Aubage Fixe de Compresseur).

摘要

A simple compressor test rig typically consists of the test compressor itself, driven by either an electric motor or a steam- or gas-turbine, with a flow-controlling throttle either upstream or downstream of the compressor, together with the necessary instrumentation. The operating condition of the compressor is controlled by adjusting the flow rate with the throttle, and the speed with the power supplied from the drive. Such a system has only one rotating component, and the dynamic behavior of the rotor system in response to a change in setting of either of the controls is relatively predictable and well-known, at least in the stable operating region of the compressor map. Even when the compressor surges, recovery can be easily effected by opening the flow throttle. If a second concentric rotor is added to the rig, and this is aerodynamically coupled to the first spool as in the 'Fanstat' configuration, the additional degree of freedom and the interaction between the spools make the prediction of the transient behavior of the system much more difficult. This report describes a hybrid computer model of the compressor test rig in the Gas Dynamics Laboratory of the National Research Council, a rig which can test both a conventional single spool compressor, and the novel two-spool compressor which is briefly described in the next section.