Dr Ingo Jahn

Senior Lecturer in Mech Engineering

School of Mechanical and Mining Engineering
Faculty of Engineering, Architecture and Information Technology
i.jahn@uq.edu.au
+61 7 334 68733
0450 676 606

Overview

Ingo Jahn's research interests are fluid structure interactions (FSI) for hypersonic flows; the design and optimisation of hypersonic vehicles and scramjet engines; turbomachinery (axial and radial) for energy, cooling and propulsion; and modeling of fluid- and thermo-dynamic systems.

Ingo Jahn joined UQ in 2012 as a lecturer in Mechanical Engineering within the School of Mechanical and Mining Engineering. He obtained a Master of Engineering Degree from the University of Oxford, UK in 2003, which was followed by a DPhil at the Turbomachinery laboratory at the University of Oxford. Between 2007 and 2012 Dr. Jahn was working for Rolls-Royce plc in the United Kingdom as a Specialist in Advanced Seals and as Research Technology Leader for Oil Systems.

Ingo is a member of the Centre for Hypersonics and is engaged with both numerical and experimental research to advance hypersonic flight. Previously Ingo lead turbomachinery research at UQ in support of the Australian Solar Thermal Research Institute (ASTRI). Here, his research delivered a prototype design for a sCO2 turbine that is integral to delivering environmentally friendly and low cost electricity to rural communities.

His research interests are:

  • Fluid Structure Interactions in hypersonic flows. Simulation and experimentation
  • Design and optimisation of scramjet engines. Specifically the use of vortices to enhance fuel mixing and fuel trasnport, thus improving overall combustion efficiency.
  • Computational Design engineering. The development of automated design tools to imporve the vehicle design and subsystem integration in hypersonic vehicles.
  • Design, testing and optimisation of radial and axial inflow turbines for small and medium applications.
  • Power conversion system for concentrated solar thermal and waste heat recovery applications.

Research Interests

  • Fluid Structure Interactions (Hypersonics
    Fluid Structure Interactions have the potential to destroy even the most robustly design structures. In aerospace applications, where weight is a premium, it is essential to find the lightest and most optimised structures that fulfill the operational requirements (aerodynamics & structure) while still avoiding undesirable FSI. - Experimental characterisation of FSI - Numerical simulation of FSI - FSI as observed in conjunction with control surfaces
  • Hypersonic Propulsion
    The design of efficient scramjet engines is one of the major challenges in the field of hypersonics. To improve fuel mixing, combustion efficiency and thus overall thrust research is ongoing in the following areas: - Investigate interaction between stream-wise vortices and fuel jets - Optimize geometry of porthole fuel injectors - Study flow of liquid hydrocarbon fuel injection - Development of flow analysis and visualization techniques
  • System Design and Integration for Flight Vehicles
    The ability of a flight vehicle to complete a given task is a function of the fundamental design decisions, choice of control actuators, controller inputs and the interaction between these. By investigating these relationships and interactions and optimising the choices made during the design process, the optimum vehicle design for a given requirement can be defined. This goal will be attained through ongoing research in these fields: - System design and vehicle integration - Flight dynamic analysis - Inverse simulation of hypersonic vehicle dynamics - Design optimisation
  • Advanced Seals / Air-Riding Seals
    Improving the performance and durability of air-air and air-oil seals is essential to increasing gas turbine efficiencies. This is due to the high secondary air system losses associated with conventional seals. These are due to increase with the arrival of even higher overall pressure ratio cycles. Air-riding seals are a technology that gives a step improvement in seal performance while at the same time ensuring long term performance retention. Key aspects of the seal development are: - Modelling of air-riding film - Analysis of unsteady operation - Investigate effects of misalignments and swash - Demonstrate air-riding seal operation in supercritical CO2

Research Impacts

Current:

Recent advances and demonstrations (e.g. HiFire and X43) show that sustained and airbreathing hypersonic flight is just around the corner. Nevertheless there are still substantial hurdles that need to be overcome to ensure the proposed vehicles can survive the hostile hypersonic environment. In particular these include improvements in engine design to improve propulsion efficiency, requiring a better understanding of supersonic combustsion; improved understanding of fluid structure interactions and vehicle control to ensure stable flight; and optimisation of the overall systems. Addressing these research areas assists in making hypersonic flight a reality, providing cheaper ways to access space, shorter travel times, etc...

Past:

Supercritical Carbon Dioxide allows the development of highly efficient power conversion systems that have the potential to displace steam as the most common medium for power conversion systems. Especially at small scale supercritical Carbon Dioxide cycles allow the development of more effective power conversion than alternatives. This is due to high efficiency and due to high power densities that can be achieved with the supercritical Carbon Dioxide. Together this allows the deveopment of efficient and economical power conversion solutions.

Combining this cycle with concentrated solar and thermal storage systems or waste heat recovery applications is an enabler for efficient decentralised electricty production. This is a key requirement for the development of future energy networks with a high penetration of renewables.

Qualifications

  • Master of Engineering, Oxf.
  • Doctor of Philosophy, Oxf.

Publications

  • Jahn, Ingo H. J. (2014). Design approach for maximising contacting filament seal performance retention. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, OnlineFirst (5) 926-942. doi:10.1177/0954406214541433

  • Forbes-Spyratos, S., Jahn, I. H., Preller, D. and Smart, M. (2014). Inverse simulation for hypersonic vehicle analysis. 19th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, Atlanta, GA, United States, 16-20 June 2014. Reston, VA, United States :American Institute of Aeronautics and Astronautics. doi: 10.2514/6.2014-2954

  • Jahn, Ingo H. J., Franceschini, Gervas, Owen, Andrew K. and Gillespie, David R. H. (2008). Experimental characterisation of the stiffness and leakage of a prototype leaf seal for turbine applications. ASME Turbo Expo 2008, Berlin, Germany, June 9-13, 2008. New York, United States :ASME. doi: 10.1115/GT2008-51206

View all Publications

Grants

View all Grants

Supervision

  • Doctor Philosophy

  • Doctor Philosophy

  • Doctor Philosophy

View all Supervision

Available Projects

  • Final Year Thesis.

    Pre-requisites: MECH4480, MECH3410, CAD experience, MECH2305

    Tasks:

    • design of moving flat plate test rig. Including simpel CFD calcs to quantify loading. (These will be conducted using Eilmer)

    • manufacture of components. This will require programming CNC machines used in MECH2305

    • verify operation of test rig. (E.g. by bench top experiments)

    • time permitting, perform testing in USQ gun tunnel.

  • Final Year Thesis.

    Pre-requisites: MECH4480, MECH3410, MECH2700

    Tasks:

    • verify moving mesh implementation in Eilmer

    • numerically investigate the flow field surrounding 2-D and 3-D object pitching/rotating relative to the free-stream flow

    • validate against test cases from literature

    This is a follow up from Matthew Trudgian's thesis, which is available from the school webpage.

  • Final Year Thesis.

    Pre-requisites: MECH3410, MECH2700, MECH4480 or MECH3750

    Tasks:

    • Develop 2-D Finite Volume code, designed for simualtion of flow in flat channels (hieght < 100micron)

    • Code uses momentum source/sink terms to account for viscous effects (friction)

    • Verification and Validation against dat from literature.

    Code will be programmed in python, some programming knowledge is essential.

View all Available Projects

Publications

Featured Publications

  • Jahn, Ingo H. J. (2014). Design approach for maximising contacting filament seal performance retention. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, OnlineFirst (5) 926-942. doi:10.1177/0954406214541433

  • Forbes-Spyratos, S., Jahn, I. H., Preller, D. and Smart, M. (2014). Inverse simulation for hypersonic vehicle analysis. 19th AIAA International Space Planes and Hypersonic Systems and Technologies Conference, Atlanta, GA, United States, 16-20 June 2014. Reston, VA, United States :American Institute of Aeronautics and Astronautics. doi: 10.2514/6.2014-2954

  • Jahn, Ingo H. J., Franceschini, Gervas, Owen, Andrew K. and Gillespie, David R. H. (2008). Experimental characterisation of the stiffness and leakage of a prototype leaf seal for turbine applications. ASME Turbo Expo 2008, Berlin, Germany, June 9-13, 2008. New York, United States :ASME. doi: 10.1115/GT2008-51206

Book

Journal Article

Conference Publication

Other Outputs

Grants (Administered at UQ)

PhD and MPhil Supervision

Current Supervision

  • Doctor Philosophy — Principal Advisor

    Other advisors:

  • Doctor Philosophy — Principal Advisor

    Other advisors:

  • Doctor Philosophy — Principal Advisor

  • Doctor Philosophy — Principal Advisor

  • Doctor Philosophy — Principal Advisor

    Other advisors:

  • Doctor Philosophy — Principal Advisor

    Other advisors:

  • Doctor Philosophy — Associate Advisor

  • Master Philosophy — Associate Advisor

    Other advisors:

  • Doctor Philosophy — Associate Advisor

Completed Supervision

Possible Research Projects

Note for students: The possible research projects listed on this page may not be comprehensive or up to date. Always feel free to contact the staff for more information, and also with your own research ideas.

  • Final Year Thesis.

    Pre-requisites: MECH4480, MECH3410, CAD experience, MECH2305

    Tasks:

    • design of moving flat plate test rig. Including simpel CFD calcs to quantify loading. (These will be conducted using Eilmer)

    • manufacture of components. This will require programming CNC machines used in MECH2305

    • verify operation of test rig. (E.g. by bench top experiments)

    • time permitting, perform testing in USQ gun tunnel.

  • Final Year Thesis.

    Pre-requisites: MECH4480, MECH3410, MECH2700

    Tasks:

    • verify moving mesh implementation in Eilmer

    • numerically investigate the flow field surrounding 2-D and 3-D object pitching/rotating relative to the free-stream flow

    • validate against test cases from literature

    This is a follow up from Matthew Trudgian's thesis, which is available from the school webpage.

  • Final Year Thesis.

    Pre-requisites: MECH3410, MECH2700, MECH4480 or MECH3750

    Tasks:

    • Develop 2-D Finite Volume code, designed for simualtion of flow in flat channels (hieght < 100micron)

    • Code uses momentum source/sink terms to account for viscous effects (friction)

    • Verification and Validation against dat from literature.

    Code will be programmed in python, some programming knowledge is essential.

  • Research higher Degree or Final year Thesis

    Porthole injection through circular holes is a method for delivering fuel to scramjet combustors. The first step of this project is to characterise how single porthole injectors interact with the flow structures present in the 2D and 3D inlet and specifically how the jet-vortex and jet-shockwave interaction enhance fuel mixing performance. The second step is to extend the work to multiple injector arrangements (e.g. axially staged) and to identify injector arrangements that lead to improved fuel mixing and scramjet combustor performance. For all cases the results will be compared to corresponding computer simulations.

    Tasks:

    • Simulation of free-stream flow - jet interaction using Eilmer

    • Investigate range of jet orifice geometries with respect to optimising jet performance (maximum penetration, maximum mixing, minimum enthalpy increase)

    This is a follow up from Antonia Flocco's thesis, which is available from the school webpage.

  • Final Year ThesisTasks:

    • Continue development of liquid injection CFD model and run simulations for supersonic cross flow
    • Simualte flow in OpenFOAM

    This is a follow on from Jake Vanderline's thesis, which is available from the school webpage.