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Featured researches published by Rudolf Konrad Selmeier.


ASME Turbo Expo 2014: Turbine Technical Conference and Exposition | 2014

Effect of the Stator Hub Configuration and Stage Design Parameters on Aerodynamic Loss in Axial Compressors

Sungho Yoon; Rudolf Konrad Selmeier; Patricia Cargill; Peter Wood

The choice of the stator hub configuration (i.e. cantilevered versus shrouded) is an important design decision in the preliminary design stage of an axial compressor. Therefore, it is important to understand the effect of the stator hub configuration on the aerodynamic performance. In particular, the stator hub configuration fundamentally affects the leakage flow across the stator. The effect of the stator hub configuration on the leakage flow and its consequent aerodynamic mixing loss with the main flow within the stator row is systematically investigated in this study.In the first part of the paper, a simple model is formulated to estimate the leakage loss across the stator hub as a function of fundamental stage design parameters, such as the flow coefficient, the degree of reaction and the work coefficient, in combination with some relevant geometric parameters including the clearance/span, the pitch-to-chord ratio and the number of seals for the shrouded geometry. The model is exercised in order to understand the effect of each of these design parameters on the leakage loss.It is found that, for a given flow coefficient and work coefficient, the leakage loss across the stator is substantially influenced by the degree of reaction. When a cantilevered stator is compared with a shrouded stator with a single seal at the same clearance, it is shown that a shrouded configuration is generally favored as a higher degree of reaction is selected, whereas a cantilevered configuration is desirable for a lower degree of reaction. Further to this, it is demonstrated that, for shrouded stators, an additional aerodynamic benefit can be achieved by using multiple seals.The second part of the paper investigates the effect of the rotating surfaces. Traditionally, only the pressure loss has been considered for stators. However, the current advanced CFD generally includes the leakage path with associated rotating surfaces, which impart energy to the flow. It is shown that the conventional loss coefficient, based on considering only the pressure loss, is misleading when hub leakage flows are modeled in detail, because there is energy addition due to the rotation of the hub or the shroud seals for the cantilevered stator and the shrouded stator, respectively. The calculation of the entropy generation across the stator is a better measure of relative performance when comparing two different stator hub configurations with detailed CFD.Copyright


Archive | 2014

AXIAL COMPRESSOR ENDWALL TREATMENT FOR CONTROLLING LEAKAGE FLOW THEREIN

Sungho Yoon; John David Stampfli; Ramakrishna Venkata Mallina; Vittorio Michelassi; Giridhar Jothiprasad; Ajay Keshava Rao; Rudolf Konrad Selmeier; Davide Giacché; Ivan Malcevic


Archive | 2014

A system and method for improving gas turbine perfomrance at part-load operation

Ya-Tien Chiu; John David Stampfli; Rudolf Konrad Selmeier


Archive | 2012

Engine with improved EGR system

Rodrigo Rodriguez Erdmenger; Cathal Clancy; Daniel Edward Loringer; Jassin Marcel Fritz; Neil Xavier Blythe; Lukas Johnson; Sebastian Walter Freund; Pierre Sebastien Huck; Jonathan Edward Nagurney; Yu Du; Matthias Lang; Rudolf Konrad Selmeier; Elisa Jubany Arribas


Archive | 2017

COMPRESSOR BLEED SYSTEMS IN TURBOMACHINES AND METHODS OF EXTRACTING COMPRESSOR AIRFLOW

Swati Saxena; Ajay Keshava Rao; Rudolf Konrad Selmeier; Grover Andrew Bennett; Giridhar Jothiprasad; Corey Bourassa; Byron Andrew Pritchard


Archive | 2016

COMPRESSOR END-WALL TREATMENT WITH MULTIPLE FLOW AXES

Giridhar Jothiprasad; Ramakrishna Venkata Mallina; John David Stampfli; Rudolf Konrad Selmeier; Davide Giacché


Archive | 2016

Verdichter mit einer Axialverdichterendwandeinrichtung zur Steuerung der Leckageströmung in dieser.

John David Stampfli; Ramakrishna Venkata Mallina; Vittorio Michelassi; Giridhar Jothiprasad; Ajay Keshava Rao; Rudolf Konrad Selmeier; Davide Giacché; Ivan Malcevic; Sungho Yoon


Archive | 2016

AXIAL COMPRESSOR ENDWALL TREATMENT FOR CONTROLLING LEAKAGE FLOW

Yoon Sungho; Stampfli John David; Mallina Ramakrishna Venkata; Michelassi Vittorio; Jothiprasad Giridhar; Rao Ajay Keshava; Rudolf Konrad Selmeier; Davide Giacché; Ivan Malcevic


Archive | 2016

A axial compressor end wall is handled for controlling wherein leakage stream

Giridhar Jothiprasad; Ivan Malcevic; John David Stampfli; Ramakrishna Venkata Mallina; Ajay Keshava Rao; Davide Giacché; Sungho Yoon; Vittorio Michelassi; Rudolf Konrad Selmeier


Archive | 2016

CIRCUMFERENTIALLY VARYING AXIAL COMPRESSOR ENDWALL TREATMENT FOR CONTROLLING LEAKAGE FLOW THEREIN

Davide Giacché; John David Stampfli; Ramakrishna Venkata Mallina; Vittorio Michelassi; Giridhar Jothiprasad; Ajay Keshava Rao; Rudolf Konrad Selmeier; Sungho Yoon; Ivan Malcevic

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