Bücher von Norbert Peters

Der katholische Priester und Hochschullehrer Norbert Peters (1863 - 1938) veröffentlichte 1913 die hier vorliegende Exegese zum "Buch Jesus Sirach". Sie war der 25. Band des von Johannes Nickel in Verbindung mit Fachgelehrten herausgegebenen exegetischen Handbuches zum Alten Testament.Nachdruck der Originalausgabe.

This volume collects the results of a workshop held at Aachen, West-Germany, Oct. 12 - Oct. 14, 1981. The purpose in bringing together scientists actively working in the field of numerical methods in flame propagation was two-fold: 1. To confront them with recent results obtained by large ac­ tivation-energy asymptotics and to check these numerically. 2. To compare different numerical codes and different trans­ port models for flat flame calculations with complex che­ mistry. Two test problems were formulated by the editors to meet these objectives. Test problem A was an unsteady propagating flat flame with one-step chemistry and Lewis number different from unity while test problem B was the steady, stoichiometric hy­ drogen-air flame with prescribed complex chemistry. The parti­ cipants were asked to solve one or both test problems and to present recent work of their own choice at the meeting. The results of the numerical calculations of test problem A are challenging just as much for scientists employing numerical me­ thods as for those devoted to large activation-energy asympto­ tics: Satisfactory agreement between the five different groups were obtained only for two out of six cases, those with Lewis number Le equal to one. The very strong oscillations that oc­ cur at Le = 2 and a nondimensional activation energy of 20 were accurately resolved only by one group. This case is par­ ticular interesting because the asymptotic theory so far pre­ dicts instability but not oscillations.

The combustion of fossil fuels remains a key technology for the foreseeable future. It is therefore important that we understand the mechanisms of combustion and, in particular, the role of turbulence within this process. Combustion always takes place within a turbulent flow field for two reasons: turbulence increases the mixing process and enhances combustion, but at the same time combustion releases heat which generates flow instability through buoyancy, thus enhancing the transition to turbulence. The four chapters of this book present a thorough introduction to the field of turbulent combustion. After an overview of modeling approaches, the three remaining chapters consider the three distinct cases of premixed, non-premixed, and partially premixed combustion, respectively. This book will be of value to researchers and students of engineering and applied mathematics by demonstrating the current theories of turbulent combustion within a unified presentation of the field.