Modellbasierte Regelung hochdynamischer Verbrennungsvorgänge

• Model based control of highly dynamic combustion processes

Lammersen, Thomas; Abel, Dirk (Thesis advisor); Kohse-Höinghaus, Katharina (Thesis advisor)

Aachen (2017, 2018)
Dissertation / PhD Thesis

Dissertation, RWTH Aachen University, 2017

Abstract

This work originates from the Collaborative Research Center 686 "Model-based Control of Homogenized Low-Temperature Combustion". It describes the development of a model-based predictive control concept to stabilize highly-dynamic combustion processes. The design of this concept consists of three main phases: Model development, design of the actual control algorithm and an implementation capable of real-time execution.The model development in this work is based on chemical reaction mechanisms, consisting of up to several hundred elementary reactions. The chemical reaction rates calculated using these mechanisms are then applied in mass and energy balancing equations resulting in a nonlinear state-space model.This model is then applied in different linear and nonlinear predictive schemes to stabilize combustion processes in numerical simulations at a desired operating point. Based on the simulation results, a linear scheme was selected for the application on the real system.The implementation involved the development of a fast and slim chemical-kinetic engine as well as the implementation of a variable step size solver for differential equations within the real-time framework of the control system.After implementing the control concept in a real-time capable manner, it was successfully applied on a stirred-reactor test bench, supplied by the Institute of Technical Combustion (ITV) at RWTH Aachen University.