Projecte llegit
Títol: Design and construction of a valveless pulsejet engine
Director/a: MELLIBOVSKY ELSTEIN, FERNANDO PABLO
Departament: FIS
Títol: Design and construction of a valveless pulsejet engine
Data inici oferta: 24-05-2020 Data finalització oferta: 24-01-2021
Estudis d'assignació del projecte:
GR ENG SIST AEROESP
| Tipus: Individual | |
| Lloc de realització: EETAC | |
| Paraules clau: | |
| valveless, pulse jet engine, propulsion, CFD, Fluent | |
| Descripció del contingut i pla d'activitats: | |
| The aim of this project is to design and build a proper valveless pulsejet engine delivering around 250N of thrust in order to test it in a student-built test rig from another final degree thesis which will provide accurate measurement of important parameters such as thrust, air mass flow through the engine and fuel flow into the combustion chamber, alongside temperature and pressure readings at selected locations within the engine to allow analysis of the thermodynamics cycle.
With the aim of having the most optimal solution in the building of our engine, we will approach the study using Computational Fluid Dynamics (CFD) software before a final design is chosen for implementation. Once the simulation is achieved, the industrial process of building the pulse jet engine will follow jointly with the installation of the different sensors and subsystems and the final testing of the engine. The thesis will be structured as: 1. Literature review of the different types of pulsejets engines, background and history 2. Analytical approach for the design of a valveless pulsejet. 3. CFD simulation 4. Industrial process: plasma cut of the sections, welding and installation of subsystems and sensors 5. Results: comparison between numerical and experimental results |
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| Overview (resum en anglès): | |
| This project develops a computational study of an engine called pulsejet. Pulse jets were the first jets to be designed and built on a large scale. They have a simple geometry, are scalable and easy to manufacture. Despite this, even today the theoretical foundations of its operation are not fully understood.
This study develops a valveless pulsejet operation in a numerical approach of two pulsejet models: the Lockwood-Hiller and the linear mode known as Chinese CS. Using the acoustic theory, it has been possible to design the pulsejet¿s geometry using Solidworks 2019. The numerical mesh was created using ANSYS Meshing and the analysis was developed in ANSYS Fluent 2020 R1. 2D planar and axisymmetric transient simulations have been performed using different models: ¿¿¿ turbulent, P1 radiation and species non-premixed combustion model. The selected fuel was propane (C3H8) and a range of operation of fuel mass flow rate between 0.06 kg/s and 0.12 kg/s has been found. Four different configurations of fuel mass flow rate: 0.06 kg/s, 0.08 kg/s, 0.1 kg/s, 0.12 kg/s were analyzed. From these models, temperature, pressure, velocity, density, frequency and thrust results have been obtained and analyzed. With the obtained data, a model for the Chinese CS pulsejet that, at a fuel mass flow rate of 0.12 kg/s, reproduces the described basic physical functioning has been characterized. This model reached peaks of 65N of thrust which represents a superior performance to the ones described in the literature for pulse jets of similar dimensions The study of the physics underlying the operation of pulse jets will allow a better understanding of their performance and, given their high scalability and affordability, it may open the doors to a number of civil applications that are underserved by conventional reactors today. |
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