Improving reciprocating compressor performance using a hybrid two-level optimisation approach
Purpose - This paper seeks to describe a design approach which can be used to manufacture better-performing reciprocating compressors. This design approach relates the drive kinematic characteristics to the thermodynamic performance of the compressor. Design/methodology/approach - The presented approach is based on employing a stochastic optimisation algorithm to find the best piston trajectory within one cycle of operation and couple that with a gradient-based technique to find the best dimensions of the mechanism which can realise this trajectory. Findings - The mathematical models presented to implement the proposed design approach have been coded in a computer program which has been employed for simulation purposes. A case study given at the end of the paper asserts the usefulness of the proposed method and proves that a few percentage points increase in a defined set of performance indices has been gained from the optimisation exercise. Research limitations/implications - The presented models are only relevant to reciprocating compressors. Practical implications - The promising results obtained in this paper will lead to the creation of better performing and more reliable compressor drives, designed to fulfil a set of desired performance criteria. Originality/value - The paper offers originality in two different aspects. The mechanism design process has been undertaken in full consideration to the thermodynamic performance of the compressor; and the coupling of the stochastic and the gradient-based optimisation methods to produce the desired outcome.
compressors kinematics thermodynamics mechanisms gears mechanical drives efficiency optimization stochastic process optimization techniques