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On the Complexity and the Handling of Multi-X Simulations in the Secondary Air System [PDF]
The secondary air system (SAS) has paramount impact on the safe operation, remaining service life and overall efficiency of aero engines. Due to the manifold interactions with other engine components, there is demand for effective consideration of the SAS in various processes along the engine life cycle. 1D fluid network models are the state of the art
Woelki, D. +3 more
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Probabilistic Analysis of the Secondary Air System of a Low-Pressure Turbine
Volume 1A: Aircraft Engine; Fans and Blowers, 2014The present investigation aims at performing a probabilistic analysis of the secondary air system of a three-stage low-pressure turbine rotor in a jet engine. Geometrical engine to engine variations due to the tolerance of the different parts as well as the variation of engine performance parameters are taken into account to analyse the impact on the ...
Stefan Brack, Yannick Muller
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CFD Study for the Particle Transport and Deposition in Secondary Air Systems
Volume 1: Compressors, Fans, and Pumps; Turbines; Heat Transfer; Structures and Dynamics, 2019Abstract The recent expansion of civil aviation industry into the new market demands modern aero-engines to operate in hot, harsh and polluted environments. Moreover there is a significant increase in the flight paths across the sea leading to large amount of micro salt particle ingestion into the engines.
Nomesh P. Kandaswamy +4 more
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An Integrated Approach to Simulate Gas Turbine Secondary Air System
Volume 7C: Heat Transfer, 2020Abstract One of the most critical parts of a modern gas turbine that its reliability and performance has a great influence on cycle efficiency is the secondary air system (SAS). Modern systems functions to supply not only cooling air flow for turbine blades and vanes but sealing flow for bearing chambers and turbine segments as well as ...
Mahmoud Chizari +3 more
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The Development of a Secondary Power System for a Commercial Supersonic Air Transport
IEEE Transactions on Aerospace, 1965A secondary power system in which all secondary power was extracted from the engine by means of large, variable-voltage, variable-frequency generators was proposed for the Lockheed Phase I SST. The quantity of constant frequency power required in the Phase IIA airplane was not favorable to such a system.
Michael J. Cronin, Philip Frankel
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Probabilistic Analysis of Stationary Gas Turbine Secondary Air Systems
Volume 3: Heat Transfer, Parts A and B, 2006In this paper probabilistic methods are applied to a 1D flow model of the Secondary Air System (SAS) of an industrial gas turbine. An overview of the methods applied and the results which can be provided by the probabilistic analysis is given. The paper especially deals with the problems that arise from the high number of probabilistic input parameters
Thomas Bischoff +3 more
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Simple Particle Separator for the Secondary Air System of Gas Turbines
Volume 4: Heat Transfer, Parts A and B, 2012In heavy-duty gas turbines as well as in aero-engines, air is extracted from the compressor and led to the hot parts of the combustor and the turbine in order to cool them. Despite active design solutions such as material selection, and inclusion of compressor inlet filters, dust holes, and so on, the cooling air can be charged with solid particles ...
Garcia Villora, N. +4 more
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The Importance of Secondary Air Mixing in Exhaust Thermal Reactor Systems
SAE Technical Paper Series, 1975<div class="htmlview paragraph">Automotive thermal reactors have obtained high conversion efficiencies on engines with very rich carburetion, but fuel economy and reactor durability have suffered. Improved mixing of exhaust gas and secondary air in the engine exhaust port was examined as a means of improving reactor efficiency at less rich engine
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Study on Calibration of Secondary Air Injection System in a V12 Engine
2017The emission regulation of CHINA 6 is going to be issued, the limits of the emissions will be greatly strict. The utilization of secondary air injection system is proved to be one of the effective methods to reduce the CO and THC emissions in the phase of cold engine.
Hongzhi Zhao, Wei Wang, Xiaofan Zhong
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Simulation Results for an Air-Conditioning System With Secondary Refrigerant Loops
Heat Pump and Refrigeration Systems Design, Analysis, and Applications, 1995Abstract There are some highly efficient and environmentally safe hydrocarbons and HFCs proposed as R22 substitutes, but they are flammable. The use of these refrigerants in an air-conditioning/heat pump system may not be acceptable. The present research looks into the prospects of using an additional loop with a secondary refrigerant as
Imam Haider, Reinhard Radermacher
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