Performance Evaluation of Rotary Vane Compressor Using - variant
A compressor is a mechanical device that increases the pressure of a gas by reducing its volume. An air compressor is a specific type of gas compressor. Compressors are similar to pumps : both increase the pressure on a fluid and both can transport the fluid through a pipe. As gases are compressible, the compressor also reduces the volume of a gas. Liquids are relatively incompressible; while some can be compressed, the main action of a pump is to pressurize and transport liquids. Many compressors can be staged, that is, the fluid is compressed several times in steps or stages, to increase discharge pressure. Performance Evaluation of Rotary Vane Compressor Using.
Lou, F. November 18, Gas Turbines Power. December ; 12 : Stall is a type of flow instability in compressors that sets the low-flow limit for compressor operation.
Introduction
During the past few decades, efforts to develop a reliable stall warning system have had limited success. This paper focuses on the small nonlinear disturbances prior to deep surge and introduces a new approach to identify these disturbances using nonlinear feature extraction algorithms including phase-reconstruction of time-series signals and evaluation of a parameter Performance Evaluation of Rotary Vane Compressor Using approximate entropy.
To the best of our knowledge, this is the first time approximate entropy has been used for stall warning, and thus, its definition and utility are presented in detail. The technique is applied to stall data sets from two different compressors: a high-speed centrifugal compressor that unexpectedly entered rotating stall during a speed transient and a multistage axial compressor with both modal- and spike-type stall inception.
In both cases, nonlinear disturbances appear, in terms of spikes in approximate entropy, prior to surge. The presence of these presurge spikes indicates the potential of using the approximate entropy parameter for small disturbance detection and stall warning.
The details of the nonlinear feature extraction algorithm, including guidelines for its application as well as results from applying the algorithm to rig-level data, are presented. One challenge that has plagued the development of gas turbine engines, from early designs to the Compressro engines of the present day, is stall and surge.
As a result of the potentially damaging consequences of entering stall, extensive research has been performed on stall inception, stall detection, and stall control. A thorough review of the previous research and progresses made on these topics can be found in Refs.
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Early works from Benser and Moses [ 3 ], Jasen [ 4 Compgessor, Greitzer [ 5 ], Camp and Day [ 6 ] discuss the two routes to compressor rotating stall including the modal- and spike-type stall inception. More recent research focuses on the physical mechanisms that produce these different routes to rotating stall. Studies from Inoue et al. Despite the enhanced understanding of stall inception mechanisms i.]
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