Gregorio Corchero

• Universidad Politécnica de Madrid

This paper compares standard gas turbine combustion chambers and CO2-diluted oxy-fuel combustion chambers for a semiclosed combined cycle at a preliminary design level. To this end, simple chemical reactor networks, based on the well-stirred reactor plus plug flow reactor scheme, are analyzed using the Cantera package and the GRI 3.0 chemical kinet...

The ETSIAE/Propulsion Section (UPM), since 1999, has participated in different European Framework Programs with the pretended objectives of emissions reduction through the SFC improvement by means of increase of thermal and/or propulsive efficiency/ies and the use of new fuels. With these objectives, new concepts has been studied through the differ...

An experimental study has been carried out on bubble generation by means of air injection through an orifice submerged in water. An orifice, drilled in an hydrophobic horizontal plate and a radius a = 1 mm, have been used to investigate the effect of the flow rate working conditions on the bubble formation process; a wide range of volumetric gas fl...

This article presents an optimization study of a semiclosed combined cycle for CO2 capture, based on the combined cycle (CC) gas turbine side, and where the produced water is extracted by condensation; its results are compared with those from the classic open CC. In this study, besides the overall pressure ratio (OPR) influence on the global effici...

Emissions are important drivers in the design and use of aero-engines. This paper presents a part of the work carried out in the VITAL (EnVIronmenTALly aero-engine) project; it consists of a parameter study on the application of three innovative thermodynamic cycles to aircraft propulsion, looking for benefits on fuel consumption, carbon dioxide, n...

An experimental investigation has been carried out on the generation of bubbles due to the injection of a constant flow rate of air through an orifice submerged in water. Orifices of different radii drilled in horizontal plates of different materials, both hydrophilic and hydrophobic, have been used to cover a range of static contact angles (68° ≤...

This paper presents some results on the performance of hydrogen-based engines. In particular, the following aspects are addressed: benefits associated with specific fuel and energy consumption, net thrust, turbine entry temperature, and hardware changes needed in the upgrading process from kerosene to hydrogen. Hydrogen is a high-energy clean-burni...

A simplified model for performance computation of monopropellant propulsion systems, hydrazine, is presented. The model allows prediction of thrust and mass flow rate for steady firing as well as for unsteady pulse mode operations, for a given thruster. Input to the model are thruster performance for an inlet pressure; performance given by its thru...

An experimental programme on flame spreading over the surface of polymethylmetacrylate (PMMA) samples has been conducted at reduced gravity conditions in the NASA KC-135 air craft laboratory. A total of 36 experiments were performed. From the results of these experiments the flame spreading velocities over PMMA samples have been obtained, as well a...

In the present work preliminary results are given of an experimental programme on flame spreading over the surface of PMMA rods in NgO2 mixtures under microgravity conditions. Results were obtained in the NASA KC-135 aircraft laboratory. Six experiments were carried out in March of this year and 36 more experiments will be conducted in March 1987....

An experimental programme on flame spreading over the surface of PMMA (plexiglass) samples has been conducted under microgravity conditions in the NASA KC-135 aircraft laboratory. A few experiments (three) were conducted in 1986 under the preceding contract no. 6284/85/F/FL, but the largest part of the experimental programme has been carried out un...

Se presenta en este trabajo un resumen del programa experimental sobre propagación de llamas a gravedad reducida que se está llevando a cabo por la Escuela Técnica Superior de Ingenieros Aeronáuticos; programa en el que últimamente colabora la empresa SENER. La propagación de llamas sobre la superficie de un sólido en atmósfera reactante es un tipo...

The system or components of a convergent-divergent (CONDI) nozzle that offer better perspectives for improvement and optimization are the actuation and cooling systems. Performance offers little margin for a direct improvement, and the utilization of advanced materials in many components of the nozzle presents no specific problems as compared with...