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research-article

ON THE INFLUENCE OF FUEL STRATIFICATION AND ITS CONTROL ON THE EFFICIENCY OF THE SHOCKLESS EXPLOSION COMBUSTION CYCLE

[+] Author and Article Information
Tim S. Rähse

Chair of Unsteady Thermodynamics in Gas Turbine Processes, Institute of Fluid Dynamics and Technical Acoustics, Technische Universität Berlin, Müller-Breslau-Str. 8, 10623 Berlin, Germany
raehse@tu-berlin.de

Panagiotis Stathopoulos

Chair of Unsteady Thermodynamics in Gas Turbine Processes, Institute of Fluid Dynamics and Technical Acoustics, Technische Universität Berlin, Müller-Breslau-Str. 8, 10623 Berlin, Germany
stathopoulos@tu-berlin.de

Jan-Simon Schäpel

Chair of Measurement and Control, Department of Process Engineering, Technische Universität Berlin, Hardenbergstr. 36a, 10623 Berlin, Germany
jan-simon.schaepel@tu-berlin.de

Florian Arnold

Chair of Measurement and Control, Department of Process Engineering, Technische Universität Berlin, Hardenbergstr. 36a, 10623 Berlin, Germany
f.arnold@tu-berlin.de

Rudibert King

Chair of Measurement and Control, Department of Process Engineering, Technische Universität Berlin, Hardenbergstr. 36a, 10623 Berlin, Germany
rudibert.king@tu-berlin.de

1Corresponding author.

ASME doi:10.1115/1.4041387 History: Received July 13, 2018; Revised August 20, 2018

Abstract

Constant volume combustion cycles for gas turbines are a very promising alternative to conventional cycles , due to their higher thermal efficiency. Shockless explosion combustion is a method to approximate constant volume combustion. It is a cyclic process consisting of four stages: wave propagation, fuel injection, homogeneous auto-ignition and exhaust. A pressure wave in the combustion chamber facilitates the filling and exhaust phases. During fuel injection, the equivalence ratio is controlled so that the mixture ignition delay time matches its residence time before self ignition. The fuel injected first must have the longest ignition delay time and form the leanest mixture with air. Similarly, fuel injected last forms the richest mixture with air. The total injection time is equal to the time that the wave needs to reach the open combustor end and return as a pressure wave to the closed end. Up to date, fuel stratification has been neglected in thermodynamic simulations of the SEC cycle. The current work presents its effect on the cycle thermal efficiency and the exhaust conditions of shockless explosion combustion chambers. This is done by integrating a fuel injection control algorithm in an existing CFD code. The capability of thisalgorithm to homogenize the auto-ignition process by improving the injection process has been demonstrated in past experimental studies of the SEC. The numerical code used for the simulation of the combustion process is based on the time-resolved 1D-Euler equations with source terms obtained from a detailed chemistry model.

Copyright (c) 2018 by ASME
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