Julian Zips M.Sc.

Julian Zips M.Sc.
Professur für Thermodynamik und Wärme-/Stoffübertragung (Prof. Pfitzner)
Gebäude 33/400, Zimmer 3413
+49 89 6004-3338
julian.zips@unibw.de

Julian Zips M.Sc.

Topic
Liquid oxygen and methane are a promising propellant combination for future reusable liquid rocket engines. The development of numerical tools for the prediction of mixing and combustion, as well as performance and thermal loads within the thrust chamber requires the consideration of the demanding operating conditions. As chamber pressures typically exceed the critical value of the propellants and at least the oxidizer is injected at cryogenic temperature, real gas effects strongly influence the flow field. Incorporating accurate real gas thermodynamics in an efficient way is therefore mandatory for the numerical method. Moreover, combustion of oxygen and methane involves a higher number of species and reactions in comparison to the classical rocket fuel hydrogen, making the flow field prediction computationally demanding. Since precise information of the combustion process is required for the computation of the thermal loads, there is a need for efficient representation of hydrocarbon chemistry within the numerical model. Non-adiabatic chemistry tabulation approaches for non-premixed combustion offer a promising compromise between accuracy and computational cost. Models to cover the physical phenomena present in rocket combustion are coupled to the open source software package OpenFOAM. Consequently, various test cases of turbulent reacting flows under rocket-like conditions are assessed using the Large Eddy Simulation technique in order to validate the developed methods.


Publications

2018
Zips, J., Müller, H., Pfitzner, M.: "Efficient thermo-chemistry tabulation for non-premixed combustion at high-pressure conditions." Flow, Turbulence and Combustion, Vol. 100, No. 4, 2018, pp.1-30
DOI: 10.1007/s10494-018-9932-4

Zips, J., Müller, H., Pfitzner, M: "Efficient thermo-chemistry tabulation for non-premixed combustion at high-pressure conditions." Work-in-Progress Poster, 37th International Symposium on Combustion, Dublin, 2018.

Traxinger, C., Zips, J., Pfitzner, M.: "Thermodynamic analysis and large-eddy simulations of LOx-CH 4 and LOx-H 2 flames at high pressure." 54th AIAA/SAE/ASEE Joint Propulsion Conference, Cincinnati, Ohio, 2018.

Breda, P., Zips, J., Pfitzner, M.: "A Non-Adiabatic Flamelet Approach for Non-Premixed O2-CH4 Combustion." Proceedings of the 3rd World Congress on Momentum, Heat and Mass Transfer (MHMT'18), 2018.

2017

Zips, J., Müller, H., Pfitzner, M.: "Large-eddy simulation of multi-element LOx/H2 combustion at transcritical conditions." 7th European Conference for Aeronautics and Aerospace Sciences (EUCASS), Milano, 2017. DOI: 10.13009/EUCASS2017-247

Hansinger, M., Breda, P., Zips, J., Traxinger, C. Pfitzner, M.: "Hybrid RANS/LES simulation of a GOX/GCH4 7-element rocket combustor using non-adiabatic flamelet method." Proceedings of the SFB/TRR40 Summer Program, 2017.

Chemnitz, A., Sattelmayer, T., Roth, C., Haidn, O., Daimon, Y., Keller, R., Gerlinger, P., Zips, J., Pfitzner, M.: "Numerical Investigation of Reacting Flow in a Methane Rocket Combustor: Turbulence Modeling." Journal of Propulsion and Power, Vol. 34, No. 4, 2018, pp.864-877  DOI:10.2514/1.B36565

Zips, J., Müller, H., Pfitzner, M.: "Large-eddy simulation of multi-element LOx/H2 combustion at transcritical conditions." SFB/TRR 40 Annual Report, 2017.

Zips, J., Müller, H., Pfitzner, M.: "Non-adiabatic Tabulation Methods to Predict Wall-Heat Loads in Rocket Combustion.", 55th AIAA Aerospace Sciences Meeting, AIAA SciTech Forum, Grapevine, Texas, 2017. (AIAA 2017-1469)

2016

Zips, J., Müller, H., Pfitzner, M: "Non-adiabatic Tabulation Methods to Predict Wall-Heat Loads in Rocket Combustion." Work-in-Progress Poster, 36th International Symposium on Combustion, Seoul, 2016.

Frank, G., Zips, J., Pfitzner, M.: "Construction of Libraries for Non-Premixed Tabulation Chemistry Combustion Models including Non-Adiabatic Behaviour due to Wall Heat Losses." SFB/TRR 40 Annual Report, 2016.

Müller, H., Zips, J., Pfitzner, M., Maestro, D. Cuenot, B., Selle, L., Ranjan, R., Tudisco, P., Menon, S.: "Numerical Investigation of Flow and Combustion in a Single-Element GCH4/GOX Rocket Combustor: A comparative LES study." 52nd AIAA/SAE/ASEE Joint Propulsion Conference, Salt Lake City, Utah, 2016.

Roth, C., Haidn, O., Chemnitz, A., Sattelmayer, T., Daimon, Y., Frank, G. Müller, H., Zips, J., Pfitzner, M.: "Numerical Investigation of Flow and Combustion in a Single-Element GCH4/GOX Rocket Combustor." 52nd AIAA/SAE/ASEE Joint Propulsion Conference, Salt Lake City, Utah, 2016.

Chemnitz, A., Sattelmayer, T., Roth, C., Haidn, O., Daimon, Y., Keller, R., Gerlinger, P., Zips, J., Pfitzner, M.: "Numerical Investigation of Flow and Combustion in a Single-Element GCH4/GOX Rocket Combustor: Aspects of Turbulence Modeling." 52nd AIAA/SAE/ASEE Joint Propulsion Conference, Salt Lake City, Utah, 2016.

2015

Zips, J., Frank, G., Müller, H., Pfitzner, M.: "Numerical simulation of a single-element GCH4/GOX rocket combustion chamber using a non-adiabatic flamelet/progress variable approach." Proceedings of the SFB/TRR40 Summer Program, 2015.

Roth, C., Haidn, O., Riedmann, H., Ivancic, B., Maestro, D., Cuenot, B., Selle, L. Daimon, Y., Chemnitz, A., Keller, R., Zips, J., Frank, G., Müller, H.: "Comparison of different modeling approaches for CFD simulations of a single-element GCH4/GOX rocket combustor." Proceedings of the SFB/TRR40 Summer Program, 2015.