Knocking in Gasoline Engines - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Knocking in Gasoline Engines write by Michael Günther. This book was released on 2017-11-21. Knocking in Gasoline Engines available in PDF, EPUB and Kindle. The book includes the papers presented at the conference discussing approaches to prevent or reliably control knocking and other irregular combustion events. The majority of today’s highly efficient gasoline engines utilize downsizing. High mean pressures produce increased knocking, which frequently results in a reduction in the compression ratio at high specific powers. Beyond this, the phenomenon of pre-ignition has been linked to the rise in specific power in gasoline engines for many years. Charge-diluted concepts with high compression cause extreme knocking, potentially leading to catastrophic failure. The introduction of RDE legislation this year will further grow the requirements for combustion process development, as residual gas scavenging and enrichment to improve the knock limit will be legally restricted despite no relaxation of the need to reach the main center of heat release as early as possible. New solutions in thermodynamics and control engineering are urgently needed to further increase the efficiency of gasoline engines.
International Conference on Ignition Systems for Gasoline Engines – International Conference on Knocking in Gasoline Engines
International Conference on Ignition Systems for Gasoline Engines – International Conference on Knocking in Gasoline Engines - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook International Conference on Ignition Systems for Gasoline Engines – International Conference on Knocking in Gasoline Engines write by Marc Sens. This book was released on 2022-10-17. International Conference on Ignition Systems for Gasoline Engines – International Conference on Knocking in Gasoline Engines available in PDF, EPUB and Kindle. For decades, scientists and engineers have been working to increase the efficiency of internal combustion engines. For spark-ignition engines, two technical questions in particular are always in focus: 1. How can the air/fuel mixture be optimally ignited under all possible conditions? 2. How can undesirable but recurrent early and self-ignitions in the air/fuel mixture be avoided? Against the background of the considerable efficiency increases currently being sought in the context of developments and the introduction of new fuels, such as hydrogen, methanol, ammonia and other hydrogen derivatives as well as biofuels, these questions are more in the focus than ever. In order to provide a perfect exchange platform for the community of combustion process and system developers from research and development, IAV has organized this combined conference, chaired by Marc Sens. The proceedings presented here represent the collection of all the topics presented at the event and are thus intended to serve as an inspiration and pool of ideas for all interested parties.
Kocking at gasoline engines
Kocking at gasoline engines - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Kocking at gasoline engines write by Matthias Kratzsch. This book was released on 2010. Kocking at gasoline engines available in PDF, EPUB and Kindle.
Modeling of End-Gas Autoignition for Knock Prediction in Gasoline Engines
Modeling of End-Gas Autoignition for Knock Prediction in Gasoline Engines - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook Modeling of End-Gas Autoignition for Knock Prediction in Gasoline Engines write by Andreas Manz. This book was released on 2016-08-18. Modeling of End-Gas Autoignition for Knock Prediction in Gasoline Engines available in PDF, EPUB and Kindle. Downsizing of modern gasoline engines with direct injection is a key concept for achieving future CO22 emission targets. However, high power densities and optimum efficiency are limited by an uncontrolled autoignition of the unburned air-fuel mixture, the so-called spark knock phenomena. By a combination of three-dimensional Computational Fluid Dynamics (3D-CFD) and experiments incorporating optical diagnostics, this work presents an integral approach for predicting combustion and autoignition in Spark Ignition (SI) engines. The turbulent premixed combustion and flame front propagation in 3D-CFD is modeled with the G-equation combustion model, i.e. a laminar flamelet approach, in combination with the level set method. Autoignition in the unburned gas zone is modeled with the Shell model based on reduced chemical reactions using optimized reaction rate coefficients for different octane numbers (ON) as well as engine relevant pressures, temperatures and EGR rates. The basic functionality and sensitivities of improved sub-models, e.g. laminar flame speed, are proven in simplified test cases followed by adequate engine test cases. It is shown that the G-equation combustion model performs well even on unstructured grids with polyhedral cells and coarse grid resolution. The validation of the knock model with respect to temporal and spatial knock onset is done with fiber optical spark plug measurements and statistical evaluation of individual knocking cycles with a frequency based pressure analysis. The results show a good correlation with the Shell autoignition relevant species in the simulation. The combined model approach with G-equation and Shell autoignition in an active formulation enables a realistic representation of thin flame fronts and hence the thermodynamic conditions prior to knocking by taking into account the ignition chemistry in unburned gas, temperature fluctuations and self-acceleration effects due to pre-reactions. By the modeling approach and simulation methodology presented in this work the overall predictive capability for the virtual development of future knockproof SI engines is improved.
On the Knocking of Gasoline Engines
On the Knocking of Gasoline Engines - read free eBook in online reader or directly download on the web page. Select files or add your book in reader. Download and read online ebook On the Knocking of Gasoline Engines write by Ludwig Richter. This book was released on 1926. On the Knocking of Gasoline Engines available in PDF, EPUB and Kindle. It is of the greatest importance, not only for automobile engines, but also for every other kind of internal combustion engine, since it limits the degree of compression and the thermal efficiency and its investigation indicates ways for saving fuel.
