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Fujisawa Lab
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A lab that uses testing and analysis to uncover the unstable flows that occur in aircraft engine compressors.
AboutAbout the lab
Reading aircraft engine compressors through testing and analysis
The Fujisawa Lab studies unstable flows that occur inside turbomachinery, such as aircraft engine compressors.
The lab operates together with Prof. Ota as the "Ota-Fujisawa Lab" and conducts its research in cooperation with industry.
Prof. Fujisawa has combined tests using the lab's compressors with computational fluid dynamics (CFD) analysis on supercomputers.
Through tests and analysis, the lab showed that the instability that becomes a problem in increasingly compact aircraft engine compressors is caused by vortices emitted periodically from the gap between the blades and the wall.
Key terms
- Turbomachinery
- Machines that give energy to, or extract energy from, air or water through the rotation of an impeller, such as compressors and turbines
- Computational fluid dynamics (CFD)
- A method that solves the equations describing flow on a computer to reproduce the behavior of flows that cannot be seen
- Rotating stall
- A phenomenon in which flow separates from part of the compressor blades, and the resulting disturbance travels around in the direction of rotation
- Windmilling
- A state in which the engine is stopped and the compressor blades are spun like a windmill by the incoming air
NewsLab news
View More ↗ResearchResearch themes
Using large experimental facilities and CFD analysis codes developed in the lab, the Ota-Fujisawa Lab works on clarifying unsteady phenomena inside turbomachinery, reducing noise, and visualizing complex flows. In addition to the lab's own research, it collaborates across industry, government, and academia, including joint research with industry and national projects of NEDO.
*Illustrative imageRotating Instability Disturbances and Inlet Flow Distortion
The lab studies phenomena that appear as precursors to stall in axial compressors for aircraft engines. It also covers the performance of rotating blades when the inlet flow is disturbed (Inlet Distortion).
*Illustrative imageRotating Stall in Diffusers
The lab studies rotating stall in the diffusers of centrifugal compressors, and what the structure of the internal flow looks like at that time.
*Illustrative imageRotating Stall in High-Pressure Centrifugal Compressors for Aircraft
The target is high-pressure centrifugal compressors used in aircraft. The lab investigates the flow structure of rotating stall that occurs in the impeller and the pipe diffuser.
*Illustrative imageWork and Loss in Windmilling Conditions
The lab studies how the work done by the blades and the losses arise in a compressor in a windmilling state. A single-stage compressor blade row is installed in a rotating cascade wind tunnel for testing.
MembersFaculty
The Ota-Fujisawa Lab consists of faculty members and master's and undergraduate students.As of 2026
- Associate ProfessorNobumichi Fujisawa
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RelatedLabs similar to Fujisawa Lab
Ohta 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: “CFM56 High Pressure Compressor Rotor” Nubifer / CC BY-SA 3.0 (cropped)
- Rotating Instability Disturbances and Inlet Flow Distortion: “Compressor case from turbojet” Olivier Cleynen / CC BY-SA 3.0 (cropped)
- Rotating Stall in Diffusers: “Water vortex ( )” Carlos Adampol Galindo from DF, México / CC BY-SA 2.0 (cropped)
- Rotating Stall in High-Pressure Centrifugal Compressors for Aircraft: “Impeller 2” Tiia Monto / CC BY-SA 3.0 (cropped)
- Work and Loss in Windmilling Conditions: “Five windmills with low sails ( )” Maarten Heerlien from Voorschoten, The Netherlands / CC BY 2.0 (cropped)
- Related lab (Ohta Lab): “Blades of an axial compressor rotor, Deutsches Museum” Wilfredor / CC0 (cropped)
- Related lab (Miyagawa Lab): “Cavitating-prop” U.S. Navy / Public domain (cropped)
- Related lab (Sato Lab): “J58 AfterburnerT” NASA / Public domain (cropped)
- Related lab (Naitoh Lab): “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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