1,721,052 research outputs found
Thermodynamic Characteristics of a CVC Turbine Engine with Heat Recovery
No full textModern gas turbines operate according to the Brayton thermodynamic cycle, in which the combustion process takes place at constant pressure. However, at the beginning of the last century, the German engineer Hans Holtzwarth built a turbine in which combustion took place in a closed volume, in a similar way to what happens in piston engines, and the operating cycle of this engine, with constant volume combustion (CVC), is the Humphrey cycle. Today, thanks also to the development of electronic control systems, this gas turbine cycle has attracted new interest, as it promises to achieve high efficiencies. The regeneration of the heat present in the turbine exhaust is a technique, widely used in the industrial field, being studied in the aeronautical field, which allows to greatly increase the gas turbine energy efficiency, significantly reducing fuel consumption, and consequently the formation of some pollutants. In this work, through the development of a thermodynamic numeric program, which performs a parametric analysis of the working cycle, the effect on performance and efficiency of the use of the practice of regeneration in a gas turbine with constant volume combustion is studied
Performances Analysis of High By Bass Jet Engine With Intercooling and Regeneration
No full textThe recovery of heat available in the exhaust of a gas turbine engine is one of the main
challenge for the aircraft propulsion systems engineers. In fact this can have great impact on
fuel saving and, consequently, environment protection. Infact with an efficient recovery of
the heat present in the exhaust of jet engines it is possible to rise their thermal efficiency.
The practice used to achieve this goal is regeneration. It consists in recovering part of the
enthalpy present in exhaust gas to pre heat air before introducing it into the combustion
chamber. This practice is well known and widely used in ground power plants. It is not
utilized in aircraft engines mainly for the extra weight and size due to the presence of the
heat exchangers and for the more complicated flow pattern that it comes from it The
efficiency of regeneration is improved if it is used at the same time with intercooling, a
practice consisting in cooling the air during the compression process so to reduce the
compression work. In this work a thermodynamic cycle analysis is performed to put in
evidence the advantages, in terms of power increase and fuel consumption reduction, of the
introduction of regeneration and intercooling in a turbofan engine at high by-pass rati
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