The release of pollutants via combustion processes (emissions) and their impact on the environment (immissions) are an important research area in the CKA department. The emission sources range from the exhaust gases from combustion processes to the abrasion of mechanical brakes. In addition to the determination of gaseous pollutants (e.g., NOx, CO, hydrocarbons), the investigation of ultra-fine particles (UFP) is a core competence of the CKA department. The main goal of the research activities is to improve the local air quality by identifying relevant emission sources and developing mitigation measures.
The determination of airborne particles requires highly sophisticated equipment. The department has modern instrumentation at its disposal for these purposes, which allow the characterization of both the particles and gaseous compounds released. The devices determine particle number concentrations in the size range between 2.5 nm and 10 µm. The determination of the soot mass of the particles < 100 nm is also possible down to the trace range. A size-selective separation also allows the subsequent chemical analysis of the separated particles.
As part of research projects, the department examines in particular stationary sources in the energy and flight sectors (e.g., engine and combustion chamber test rigs, aircraft ground runs, gas turbines/power plants, etc.). The mobile laboratory for air and exhaust gas analytics is used to make on-site measurements. In addition, the mobile laboratory offers the option of carrying out measurement campaigns in an urban environment.
Mobile Lab for Air and Exhaust Gas Measurements
Equipment of the CKA department
Schripp, T.; Herrmann, F.; Oßwald, P.; Köhler, M.; Zschocke, A.; Weigelt, D.; Mroch, M.; Werner-Spatz, C., Particle emissions of two unblended alternative jet fuels in a full scale jet engine. Fuel 2019, 256, 115903. (https://elib.dlr.de/131812/)
Schripp, T.; Grein, T.; Zinsmeister, J.; Oßwald, P.; Köhler, M.; Müller-Langer, F.; Hauschild, S.; Marquardt, C.; Scheuermann, S.; Zschocke, A.; Posselt, D., Technical Application of a Ternary Alternative Jet Fuel Blend – Chemical Characterization and Impact on Jet Engine Particle Emission Fuel 2021, 288, 119606. (https://elib.dlr.de/140800/)