Shockless explosion combustion - Controlled autoignition in stratified mixtures for pressure gain combustion
type: CreativeWork
description: This work investigates the reliable generation of a homogeneous autoignition in a reactive mixture flow as a pressure gain combustion approach. Pressure gain combustion represents a promising concept to achieve an increase in the thermal efficiency of gas turbine applications compared to conventional constant pressure combustion. The concept is based on a pulsating operation with high frequency injection of a defined mixture profile into a continuous air flow that undergoes homogeneous autoignition. The injected fuel profile has been tailored to compensate for the gradient in residence time and hence, enable the simultaneous ignition of the entire combustor volume leading to an aerodynamic confinement which ultimately results in an increase in pressure. This pressure rise is highly dependent on the homogeneity of the autoignition which can be characterized by the number of quasi-simultaneous ignitions occurring inside the combustor volume. An increased homogeneity results in a greater pressure rise and simultaneously minimized the occurrence of shock waves. This type of combustion is termed as shockless explosion combustion (SEC). The main objective of this work is investigate the SEC process experimentally and enable a repeatable and reliable operation which has been realized within the frame of four publications. First, an initial test rig was modified to allow for the precise injection of a desired fuel profile into a continuous air flow and subsequently observe autoignition within a desired combustor section. Secondly, optical measurement techniques were applied to quantify the successful injection of the desired fuel profile which stays largely preserved during convection in the combustor. As a next step, the correlation between three model injection profiles and the resulting autoignition was investigated. A significant and reproducible influence of the fuel injection on the ignition distribution is observed. These observations are subsequently used to apply a…
abstract: This work investigates the reliable generation of a homogeneous autoignition in a reactive mixture flow as a pressure gain combustion approach. Pressure gain combustion represents a promising concept to achieve an increase in the thermal efficiency of gas turbine applications compared to conventional constant pressure combustion. The concept is based on a pulsating operation with high frequency injection of a defined mixture profile into a continuous air flow that undergoes homogeneous autoignition. The injected fuel profile has been tailored to compensate for the gradient in residence time and hence, enable the simultaneous ignition of the entire combustor volume leading to an aerodynamic confinement which ultimately results in an increase in pressure. This pressure rise is highly dependent on the homogeneity of the autoignition which can be characterized by the number of quasi-simultaneous ignitions occurring inside the combustor volume. An increased homogeneity results in a greater pressure rise and simultaneously minimized the occurrence of shock waves. This type of combustion is termed as shockless explosion combustion (SEC). The main objective of this work is investigate the SEC process experimentally and enable a repeatable and reliable operation which has been realized within the frame of four publications. First, an initial test rig was modified to allow for the precise injection of a desired fuel profile into a continuous air flow and subsequently observe autoignition within a desired combustor section. Secondly, optical measurement techniques were applied to quantify the successful injection of the desired fuel profile which stays largely preserved during convection in the combustor. As a next step, the correlation between three model injection profiles and the resulting autoignition was investigated. A significant and reproducible influence of the fuel injection on the ignition distribution is observed. These observations are subsequently used to apply a…
author: Yücel, Fatma Cansu
language: en
license: http://rightsstatements.org/vocab/InC/1.0/
date published: 2021
date modified: 2026-07-27T21:28:44Z
provider: Technische Universität Berlin
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Technische Universität Berlin

PropertyValue
property ID: DOI
value: 10.14279/depositonce-12246