A phenomenological base semi-physical thermodynamic model for the cylinder and exhaust manifold of a natural gas 2-megawatt four-stroke internal combustion engine

Guillermo Valencia Ochoa; Cesar Isaza-Roldan; Jorge Duarte Forero

doi:10.1016/j.heliyon.2019.e02700

A phenomenological base semi-physical thermodynamic model for the cylinder and exhaust manifold of a natural gas 2-megawatt four-stroke internal combustion engine

Heliyon. 2019 Oct 22;5(10):e02700. doi: 10.1016/j.heliyon.2019.e02700. eCollection 2019 Oct.

Authors

Guillermo Valencia Ochoa¹, Cesar Isaza-Roldan², Jorge Duarte Forero¹

Affiliations

¹ Programa De Ingeniería Mecánica, Universidad Del Atlántico, Carrera 30 Número 8-49, Puerto Colombia, Barranquilla, 080007, Colombia.
² Programa de Ingeniería Mecánica, Universidad Pontificia Bolivariana, Medellín, 050004, Colombia.

Abstract

This paper presents the application of a systematic methodology to obtain a semi-physical model of phenomenological base for a 2 MW internal combustion engine to generate electric power operating with natural gas, as a function of the average thermodynamic value normally measured in industrial applications. Specifically, the application of the methodology is focused on the cylinders, exhaust manifold, and turbocharger turbine sections. The proposed model was validated with actual operating data, obtaining an error rate not exceeding 5%, which allow a thermal characterization of the Jenbacher JMS 612 GS-N based on the model. A parametric analysis is conducted; considering the volumetric efficiency, the output electric power, the effective efficiency, the exhaust gas temperature, the turbine mass flow, the specific fuel consumption under the nominal operation conditions, which is 1.16 bar in the gas pressure, 65 °C in the cooling water temperature, 35 °C in the average ambient temperature, and 1500 rpm. The results of this model can be used to evaluate the thermodynamic performance parameters of waste heat recovery systems. On the other hand, new control strategies and the implementation of state observers for the detection and diagnosis of failures can be developed based on the proposed model.

Keywords: Applied mathematics; Energy conservation; Mathematical modeling; Mean value model; Mechanical engineering; Natural gas; Phenomenological base semi-physical model; Power generation; Spark ignition engine; Thermodynamics.