Applicable and Comparative Research of Compressor Mass Flow Rate and Isentropic Efficiency Empirical Models to Marine Large-Scale Compressor

Haosheng Shen,Chuan Zhang,Baozhu Jia,Baicheng Yang,Jundong Zhang

doi:10.3390/en13010047

Abstract

A compressor is an indispensable component of marine large two-stroke diesel engines. For this type of engine, the compressor mass flow rate and isentropic efficiency empirical models are preferred for both the working cycle dynamic simulation research and the design and testing of control and diagnostics algorithms due to their compact and simple structures, and satisfactory prediction accuracy. Due to absence of comprehensive applicable and comparative research on compressor mass flow rate and isentropic efficiency empirical models for large-scale marine compressors in the literature, two marine compressors with different size, flow rate range, and speed range were selected as research objects in this paper, and a relevant study was conducted to compare and analyze the prediction ability of several classical models, and some recently proposed compressor mass flow rate and isentropic efficiency empirical models. The range of this comparative study includes the prediction accuracy in the design operating area and the extrapolation ability in off-design operating areas. Based on the obtained research results, several guidelines are summarized, which can be followed when developing compressor mathematical models, especially for marine applications. In addition, several research interests are discussed and presented, which can be further studied in the future.

Highlights

Due to the vital role of the turbocharger in improving power density, lowering fuel consumption, and reducing emissions for diesel engines, researchers have conducted extensive theoretical and experimental studies to exploit its capability further
The predictive accuracy of both the Hadef model and the Llamas model were slightly inferior to the Guan Cong model, they were still satisfactory, with a MAPE of less than 1% and a PEB±5% approaching 100% for both compressors, and this is attributed to the excellent parameterization results achieved with R2 approaching one, and the strong physical fundamentals embedded in the two models
Consistent comparative analysis results were obtained for the two different compressors, and they are summarized as follows: Compressor mass flow rate model:

Summary

Introduction

Due to the vital role of the turbocharger in improving power density, lowering fuel consumption, and reducing emissions for diesel engines, researchers have conducted extensive theoretical and experimental studies to exploit its capability further. In the field of automotive engines, several new types of turbocharging systems have emerged, such as electrically assisted turbocharging systems (E-Turbo), variable geometry turbochargers (VGTs), and variable geometry compressors (VGCs). It was revealed by many pieces of research that, compared with traditional turbocharging technology, these advanced technologies can effectively improve turbocharger performance at low loading conditions and substantially extend the operating range [1,2]. Some relevant studies on large-scale marine turbochargers, especially for compressors, can be found in the literature

Objectives

Methods

Findings

Discussion

Conclusion