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Projecte llegit

Títol: Micro gas turbine intake design for test rig airflow adaptation and air mass flow measurement


Estudiants que han llegit aquest projecte:


Director/a: MELLIBOVSKY ELSTEIN, FERNANDO PABLO

Departament: FIS

Títol: Micro gas turbine intake design for test rig airflow adaptation and air mass flow measurement

Data inici oferta: 31-01-2019     Data finalització oferta: 30-09-2019



Estudis d'assignació del projecte:
    DG ENG AERO/SIS TEL
    DG ENG AERO/TELEMÀT
    GR ENG SIST AEROESP
Tipus: Individual
 
Lloc de realització: EETAC
 
Paraules clau:
Micro Jet Engine, Air Intake, On-Ground Test Rig
 
Descripció del contingut i pla d'activitats:
The aim of this project is to review alternative solutions for adapting ther air flow and assessing the air massflow into a micro gas turbine engine in ground testing conditions, and to design a scalable air intake that provides optimal performance and accurate measurements. The work plan will be as follows:

1) literature review on air intakes for gas turbine ground testing
2) design of an optimal intake in terms of flow adaptation
3) simulate air intake performance with open source cfd tools
4) design a system of probe arrays for static and total pressure measurements for air flow evaluation
5) design a data acquisition system to exploit the raw readings from pressure probes
6) Draw up a budget for the construction and assembly of the probe-fitted air intake and the
 
Overview (resum en anglès):
The objective of this work is the study and design of a bell mouth inlet duct. The project is divided in several phases: literature review, design with CAD tool, simulation with a CFD tool, location of probes and measuring equipment and finally construction, assembly and commissioning budget.

In the first phase of the literature review, it has been studied what are test rig facilities, as well as the objectives of bell mouth inlet ducts and why are necessary.

In the design phase, three different bell mouths have been designed taking into account that the elliptical streamwise radial cross-section for a bell mouth is the best according to previous studies. The three bell mouths have different dimensions (basically, the difference among them is the length of the semi-major axis). Moreover, the bell mouth inlet ducts have been designed taking into account that should be able to work with the micro gas turbine EvoJet B170 Neo.

In the CFD simulation phase, the three bell mouth inlet ducts have been simulated to know which one is better in terms of air flow adaptation and the results of the air mass flow at different locations when changing outlet static pressures. Firstly, the total pressure has been maintained constant at 1 atm (101325 Pa) and at the bell mouth outlet, a static pressure of 100075 Pa has been imposed so that the pressure gradient has created a suction of the air. Finally, it has been decided to choose to use bell mouth 1 in the EvoJet. Different static pressures from 99500 Pa to 93175 Pa, and then from 90000 Pa to 50000 Pa have been imposed to study the air flow behavior through out the bell mouth at different velocities. Moreover, the velocity and pressure variation in function of the radius at different locations x along the inlet have been studied: v(r,x) and p (r,x). It has also been studied how changed the velocity and pressure values along the duct at different gradient pressures studying the values of points located along the duct.

The next phase has been the placement of probes to obtain a good estimation of the air mass flow. The necessary probe equipment as well as the location have been justified. Also the measuring instruments.

The last phase of the project has been the construction, assembly and commissioning budget. To do it, the physical properties of various materials have been studied briefly to know which is the best material from an economic and qualitative point of view. The result has been 6061 aluminum and nylon. For this reason, a factory has been contacted in order to know which is the price for creating an aluminum 6061 bell mouth, and a nylon bell mouth. The probes prices have also been included in the total sum price of the budget.


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