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Ohta Lab
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A fluid engineering lab that uses experiments and numerical analysis to uncover unstable phenomena inside turbomachinery.
AboutAbout the lab
Solving the mystery of unstable flows inside turbomachinery.
The Ohta-Fujisawa Lab works with industry to study the mechanisms of unsteady phenomena that occur inside turbomachinery.
Unstable phenomena inside turbomachinery lead to problems such as unstable operation, increased noise, and equipment damage.
Using large-scale experimental facilities and computational fluid dynamics (CFD) analysis code developed in the lab, the lab works to clarify these phenomena.
Key terms
- Turbomachinery
- Machines that rotate an impeller or rotor to give energy to a fluid or extract energy from it (such as compressors and turbines)
- Rotating stall
- An unstable phenomenon in which part of the flow inside a compressor becomes disturbed and spreads while rotating in the circumferential direction
- Surge
- An unstable phenomenon in which the flow inside a compressor pulsates violently and sometimes temporarily reverses direction
NewsLab news
A master's student received the Gas Turbine Society of Japan Award (Encouragement Award)
A master's student received the Gas Turbine Society of Japan Student Excellent Presentation Award
A paper received the Turbomachinery Society of Japan Award (Paper Award) for fiscal 2024 (Reiwa 6)
A master's student received the Mechanical Engineering Memorial Academic Award (Seki Award)
A master's student received the Gas Turbine Society of Japan Student Excellent Presentation Award
ResearchResearch themes
The Ohta-Fujisawa Lab owns large-scale experimental facilities and also develops its own computational fluid dynamics (CFD) analysis code. Its research aims to clarify unsteady phenomena inside turbomachinery, reduce noise, and visualize complex flows.
*Illustrative imageNoise reduction in centrifugal compressors
The lab investigates the structure of the noise generated in centrifugal compressors used in turbochargers and the way the sound propagates, and researches how to reduce it.
*Illustrative imageUnstable phenomena in axial compressors
The lab studies the mechanisms of unstable phenomena known as surge and rotating stall that occur in small axial compressors.
*Illustrative imageClarifying rotating instability
In axial compressors for aircraft engines, the lab investigates phenomena that precede stall, as well as the effect of flow disturbances (inlet distortion) on the performance of the rotor blades.
*Illustrative imageUnstable phenomena in centrifugal compressor diffusers
The lab investigates the flow structure of rotating stall inside the diffusers of centrifugal compressors, working to clarify these unstable phenomena.
MembersFaculty
The members of the Ohta-Fujisawa Lab consist of faculty and master's and undergraduate students.As of 2026
- ProfessorYutaka Ohta
- Associate ProfessorNobumichi Fujisawa
VoicesStudent voices
Compiled from answers by students who were in the lab. Ratings and reviews reflect individual students' experiences, not the lab's official views.
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RelatedLabs similar to Ohta Lab
Fujisawa LabSchool of Fundamental Science and Engineering, Department of Applied Mechanics and Aerospace EngineeringFluid engineering and turbomachinery
Miyagawa LabSchool of Fundamental Science and Engineering, Department of Applied Mechanics and Aerospace EngineeringFluid machinery and turbomachinery
Sato LabSchool of Fundamental Science and Engineering, Department of Applied Mechanics and Aerospace EngineeringHypersonic turbojets and aerospace transportation
Naitoh LabSchool of Fundamental Science and Engineering, Department of Applied Mechanics and Aerospace EngineeringQuantum thermo-fluid science and fundamental life scienceThe information on this page is compiled by the LabLog team from the lab's public information and interviews. For corrections or removal requests, please contact LabLog, not the lab.
Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Blades of an axial compressor rotor, Deutsches Museum” Wilfredor / CC0 (cropped)
- Noise reduction in centrifugal compressors: “RF Fully Anechoic Room 2” Mihaelawojcik / CC BY 4.0 (cropped)
- Unstable phenomena in axial compressors: “Smoke Incense AB” Andrzej Barabasz / CC BY-SA 4.0 (cropped)
- Clarifying rotating instability: “Airplane vortex edit” NASA Langley Research Center / Public domain (cropped)
- Unstable phenomena in centrifugal compressor diffusers: “Egypt - Dust devil (65797)” Mannivu / CC BY-SA 4.0 (cropped)
- Related lab (藤澤研究室): “CFM56 High Pressure Compressor Rotor” Nubifer / CC BY-SA 3.0 (cropped)
- Related lab (宮川研究室): “Cavitating-prop” U.S. Navy / Public domain (cropped)
- Related lab (佐藤研究室): “J58 AfterburnerT” NASA / Public domain (cropped)
- Related lab (内藤研究室): “1-50 Scale Model Of The 80X120 Foot Wind Tunnel Model (NFAC) In The Test Section Of The 40X80 Wind Tunnel At Nasa Ames (A76-0635)” NASA Ames Research Center / Public domain (cropped)
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