Sökning: "upper stage design"

Visar resultat 1 - 5 av 12 uppsatser innehållade orden upper stage design.

1. 1. Hydrogen storage systems : Methodology and model development for hydrogen storage systems performance evaluation based on a transient thermodynamic approach

   Master-uppsats, Mälardalens universitet/Akademin för ekonomi, samhälle och teknik

   Författare :Kreshnik Margaritari; [2023]
   Nyckelord :Hydrogen; Hydrogen storage system; Hydrogen filling process; Hydrogen storage system operation; Hydrogen storage system design; Hydrogen fast filling; Hydrogen tank modelling;

   Sammanfattning : The overall performance of a hydrogen storage system can be affected by various parameters, such as operation and design parameters, but also by the state of the hydrogen contained inside the storage tanks. In this work, a methodology is developed to evaluate the state of the hydrogen during the filling process and its impact on the overall system performance under variable operation conditions and design parameters. LÄS MER

3. 2. Preliminary Design of a 30 kN Methane-Oxygen-powered Electric-Pump-fed Liquid Rocket Propulsion System

   Master-uppsats, Luleå tekniska universitet/Rymdteknik

   Författare :Vikramjeet Das; [2023]
   Nyckelord :rocket engine; liquid rocket; methalox; electropump; LRPS; LPRE; liquid methane; electric pump feed system;

   Sammanfattning : The design of a liquid rocket propulsion system, unlike that of a standalone system, is intertwined with the overall development of a number of associated systems and is influenced by a multitude of conditions and considerations: from the requirements needed to accomplish the mission to the rationalizations involved behind the development of each rocket system and/or component. In my thesis, the preliminary design of a “new generation” 30 kN rocket engine driven by an electric pump feed system and running on liquid methane and liquid oxygen is performed. LÄS MER

4. 3. EVALUATION OF MULTI-ZONE MODELLING FOR FIRE RISK ASSESSMENT IN TUNNELS

   Master-uppsats, Lunds universitet/Avdelningen för Brandteknik

   Författare :Annachiara Nardone; [2023]
   Nyckelord :tunnels; tunnel fires; multi-zone modelling; Technology and Engineering;

   Sammanfattning : Abstract Tunnels are one of the most complex and delicate elements of the road system. Assessing fire behaviour and fire severity remains the biggest source of uncertainty in risk assessment and is an essential step in the tunnel design process. LÄS MER

5. 4. Assessment of Ground Vibration for Early-Stage Design

   Master-uppsats, KTH/Bro- och stålbyggnad

   Författare :Fadi Rafea Jameel Jameel; Patrick Francesco Joseph; [2022]
   Nyckelord :;

   Sammanfattning : Ground borne vibrations in urban areas can be caused by human activities such as railwayand road traffic, construction works and industrial manufacturing. These vibrations can playa significant role in human comfort and the disruption of vibration sensitive equipment inbuildings. LÄS MER

7. 5. Exprimental Study of Spin-Up of a Fluid-Filled Cylindrical Tank

   Master-uppsats, Lunds universitet/Institutionen för energivetenskaper

   Författare :Jakob Svensson; [2018]
   Nyckelord :CFD Computational Fluid Dynamics Experimental Physics Spinning Spin Flow Laser Image Analysis Acceleration Ekman Boundary Layer Rossby Vortex Parabola Particles; Physics and Astronomy;

   Sammanfattning : To ensure safety on upper stage rockets, the fluid dynamic phenomenon known as sloshing in the liquid propellant tanks needs to be understood. CFD is a relatively cheap tool, but studies by Schmitt [7] suggest that models currently used for simulations do not predict the flow behavior. LÄS MER