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Publications (13)
Increasing the efficiency of jet engines is essential to meet the demanded climate targets. Ceramic matrix composites (CMC) are strong candidates for aircraft applications because they withstand high temperatures, while their density is two-thirds lower than that of conventional nickel-based alloys. This leads to cooling air savings and a lower ove...
In this paper, a reduced order film cooling model previously investigated on single cylindrical and laid back fan-shaped cooling holes is extended with a model variant for trailing edge cooling slots. The extended model is evaluated on a modern HPT NGV combining these cooling features and paired with either an eddy viscosity model or a differential...
Increasing the efficiency of jet engines is essential to meet the demanded climate targets. Ceramic matrix composites (CMC) are strong candidates for aircraft applications because they withstand high temperatures, while their density is two-thirds lower than that of conventional nickel-based alloys. This leads to cooling air savings and a lower ove...
Accurately estimating turbine cooling requirements at a preliminary design stage is crucial for modeling the overall propulsive system. The operating conditions of compressor, combustor and turbine are significantly influenced by these requirements. Empirical cooling models have thus far provided reliable initial estimations. For next-generation ae...
Ceramic Matrix Composites (CMCs) offer great potential for developing lighter and more efficient aero-engines. Due to their high temperature capability, CMCs are mainly used in thehot gas section in order to replace cooled metallic components and thus save cooling air. Especially CMC vanes for high pressure turbines (HPTs) have been researched and...
Efficient turbine vane cooling designs are increasingly important to improve the thermal efficiency of gas turbines. Evaluating the performance of a cooling design requires the knowledge of the temperature distribution on the vane surface and the cooling air mass flow rate. The estimation of the vane temperature distribution is considered as a conj...
Ceramic Matrix Composites (CMCs) offer great potential for developing lighter and more efficient aero-engines. Due to their high temperature capability, CMCs are mainly used in the hot gas section in order to replace cooled metallic components and thus save cooling air. Especially CMC vanes for high pressure turbines (HPTs) have been researched and...
Improvements in turbine blade cooling are crucial in order to increase the thermal efficiency of modern gas turbines. Designing highly efficient cooling concepts and evaluating their impact on the thermodynamic cycle performance during early design phases is therefore becoming increasingly important. The cooling air requirements are commonly approx...
The investigated generic configuration consists of cylindrical film cooling holes with a diameter of D = 8:4 mm and an inclination angle of alpha = 35°. The jets are characterized by a momentum flux ratio of I = 0.63, a density ratio of DR = 0.94 and a cross-flow Reynolds number of Re = 5500. Stereoscopic PIV allows creating a (pseudo) three dimens...
In COOL wurde untersucht inwieweit die laseroptische Methode der gefilterten Reyleigh-Streuung für zeitlich aufgelöste Temperaturmessungen eingesetzt werden kann. Am vielversprechendsten hat sich dabei der Einsatz des FRS-Systems als Punktsensor herausgestellt, welcher sich derzeit bei AT-OTM in der Erprobungsphase befindet. Diese Methode erfordert...
Die Filmkühlung ist eine verbreitete Methode zur Kühlung von thermisch hoch beanspruchten Komponenten einer Turbine. Dazu zählen die Rotor- und Statorschaufeln der ersten Turbinenstufe. In einer Zusammenarbeit der DLR Abteilungen Triebwerksmesstechnik (AT-OTM) und Turbine (AT-TUR) wurden experimentelle und numerische Untersuchungen einer generische...
Die Filmkühlung ist eine verbreitete Methode zur Kühlung von thermisch hoch beanspruchten Komponenten einer Turbine. Dazu zählen die Rotor- und Statorschaufeln der ersten Turbinenstufe. In einer Zusammenarbeit der DLR Abteilungen Triebwerksmesstechnik (AT-OTM) und Turbine (AT-TUR) wurden experimentelle und numerische Untersuchungen einer generische...
Inhalt dieses Dokumentes ist eine Übersicht der gängigen dimensionslosen Kennzahlen der Aero- /Thermodynamik und Turbomaschinen sowie eine kurze Beschreibung dieser.
