Teemu Ovaska

Research

My research interests focus on exhaust emissions, alternative liquid fuels and exhaust aftertreatment systems by conducting experimental laboratory research on high- and medium-speed internal combustion engines.

Peer-reviewed scientific articles

Mikulski, M., Ovaska, T., Rabetino, R., Kangasjärvi, M. & A. Myllykangas. 2025. “Clean Propulsion Technologies: Securing Technological Dominance for the Finnish Marine and Off-Road Powertrain Sectors.” Energies 18(5), 1240. https://doi.org/10.3390/en18051240.

Ovaska, T., Spoof-Tuomi, K., Niemi, S., Valkjärvi, P., Maunula, T., Mikulski, M., Lehtoranta, K., Alanen, J. & M. Happonen. 2025. “Effect of late diesel injection on close-coupled SCR + ASC during DPF regeneration period.” Fuel 381, Part B, 133406. https://doi.org/10.1016/j.fuel.2024.133406.

Sirviö, K., J. Kaivosoja, C. Nuortila, H. Wang-Alho, S. Niemi & T. Ovaska. 2023. ”B20 Fuel Compatibility with Steels in Case of Fuel Contamination.” Energies 16(16), 5933. https://doi.org/10.3390/en16165933.

Spoof-Tuomi, K., V. Vauhkonen, S. Niemi, T. Ovaska, Vilja Lehtonen, S. Heikkilä & O. Nilsson. 2021. “Crude Tall Oil based Renewable Diesel: Performance, Emission Characteristics and Storage Stability.” SAE Technical Paper, 2021-01-1208. https://doi.org/10.4271/2021-01-1208.

Spoof-Tuomi, K., V. Vauhkonen, S. Niemi, T. Ovaska, Vilja Lehtonen, S. Heikkilä & O. Nilsson. 2021. “Effects of Crude Tall Oil Based Renewable Diesel on the Performance and Emissions of a Non-Road Diesel Engine.” SAE Technical Paper, 2021-01-1197. https://doi.org/10.4271/2021-01-1197.

Spoof-Tuomi, K., S. Niemi, T. Ovaska, O. Nilsson, S. Heikkilä & K. Ekman. 2021. “Selective Catalytic Reduction on Filter Performance Testing on Non-road Diesel Engine.” SAE Technical Paper, 2021-01-5054. https://doi.org/10.4271/2021-01-5054.

Hissa, M., S. Niemi, T. Ovaska & A. Niemi. 2021. ”Waste fish oil as an alternative renewable fuel for IC engines.” Agronomy Research 19, n:o S1: 749–766. https://doi.org/10.15159/AR.21.057.

Ovaska, T., S. Niemi, K. Sirviö, O. Nilsson, P. Karjalainen, T. Rönkkö, K. Kulmala & Jorma Keskinen. 2020. ”Role of lubricating oil properties in exhaust particle emissions of an off-road diesel engine.” SAE Technical Paper, 2020-01-0386. https://doi.org/10.4271/2020-01-0386.

Niemi, S., M. Hissa, T. Ovaska, K. Sirviö, S. Heikkilä, O. Nilsson, S. Hautala, K. Spoof-Tuomi, J. Suomela, A. Niemi & A. Kiikeri. 2020. “Performance and Emissions of a Medium-Speed Engine Driven with Sustainable Options of Liquid Fuels.” SAE Technical Paper, 2020-01-2126. https://doi.org/10.4271/2020-01-2126.

Kuuluvainen, H., P. Karjalainen, E. Saukko, T. Ovaska, K. Sirviö, M. Honkanen, M. Olin, S. Niemi, J. Keskinen & T. Rönkkö 2020. ”Nonvolatile ultrafine particles observed to form trimodal size distributions in non-road diesel engine exhaust.” Aerosol Science and Technology 54(11), 1345–1358. https://doi.org/10.1080/02786826.2020.1783432.

Ovaska, T., S. Niemi, K. Sirviö, S. Heikkilä, K. Portin & T. Asplund. 2019. ”Effect of alternative liquid fuels on the exhaust particle size distributions of a medium-speed diesel engine.” Energies 12(11), 2050. https://doi.org/10.3390/en12112050.

Ovaska, T., S. Niemi, K. Sirviö & O. Nilsson. 2019. ”Exhaust particle number of a non-road diesel engine fuelled by methyl esters with different fatty acid compositions.” Agronomy Research 17(S1); 1165–1180. https://doi.org/10.15159/AR.19.089.

Ovaska, T., S. Niemi, K. Sirviö, O. Nilsson, K. Portin & T. Asplund. 2019. ”Effects of alternative marine diesel fuels on the exhaust particle size distributions of an off-road diesel engine.” Applied Thermal Engineering 150, 1168–1176. https://doi.org/10.1016/j.applthermaleng.2019.01.090.

Hissa, M., S. Niemi, K. Sirviö, A. Niemi & T. Ovaska. 2019. “Combustion studies of a non-road diesel engine with several alternative liquid fuels.” Energies 12(12), 2447. https://doi.org/10.3390/en12122447.

Ovaska, T., S. Niemi, T. Katila & O. Nilsson. 2018. “Exhaust particle size distributions of a non-road diesel engine in an endurance test.” Agronomy Research 16(S1), 1159–1168. https://doi.org/10.15159/AR.18.087.

Niemi, S., V. Vauhkonen, S. Mannonen, T. Ovaska, O. Nilsson, K. Sirviö, S. Heikkilä & J. Kiijärvi. 2016. “Effects of wood-based renewable diesel fuel blends on the performance and emissions of a non-road diesel engine.” Fuel 186, 1–10. https://doi.org/10.1016/j.fuel.2016.08.048.

Research profiles

ResearchGate
ORCiD
Google Scholar

Dissertation:
Ovaska, Teemu (2020): Exhaust Particle Numbers of High- and Medium-Speed Diesel Engines with Renewable and Recycled Fuels. Acta Wasaensia 451. Article-based dissertation.University of Vaasa.

Teaching

I have been teaching at the University of Vaasa in both the Bachelor of Science and Master of Science degree programs in Technology since 2022, and I am responsible for the Energy Engineering major in the Smart Energy Transition Master's Program

Courses in the Bachelor's and Master's degree programs in Engineering at the University of Vaasa:

• Technical Drawing (in Finnish)
• Fluid Mechanics (in Finnish)
• Power Plants and Energy Economy (in Finnish)
• Diesel and Gas Engines (in Finnish)
• Fundamentals of Combustion Engines
• Emission regulation and emission control technologies
• Engine/Powerplant Laboratories
• Master's, and Bachelor's theses supervision

Other:

• Energy and Sustainability for upper secondary school students (in Finnish)

Conference presentations

ASME 2024 ICE Forward Conference, San Antonio, Texas, USA, October 2024

10th International Conference on Biosystems Engineering, Tartu, Estonia, May 2019

9th International Conference on Biosystems Engineering, Tartu, Estonia, May 2018

Seminar presentations

Internal Combustion Engine and Turbo Technology Seminar of Finnish Technology Industries, Helsinki, Finland, May 2014

Engine Technology Seminar of Finnish Technology Industries, Helsinki, Finland, May 2013

Other presentations:

Vaasa Arts and Science Carnival 2023, Vaasa, Finland

The Research Exhibition of Energy, Energy Week 2019, Vaasa, Finland