研究目的
To measure pressure on the rotating blades of a radial compressor using pressure sensitive paint (PSP) technique for general understanding of the flow field and for CFD validation.
研究成果
The study demonstrated that PC-PSP can be used to measure pressure on rotating compressor blades at high speeds. The pressure distribution was found to be in accordance with the pressure increase over the compressor, and time-resolved measurements detected the surge frequency. The method provides valuable data for understanding flow fields and validating CFD models.
研究不足
The main sources of error include the difficulty in accurately determining the blade temperatures and the width of the laser spot, which affects spatial resolution. The temperature correction procedure, while sound, may not fully account for local temperature variations.
1：Experimental Design and Method Selection:
The study used the lifetime method of PSP to measure pressure on rotating compressor blades. A diode laser with a scanning-mirror system illuminated the paint, and the luminescent lifetime was registered using a photo multiplier.
2：Sample Selection and Data Sources:
The experiments were performed on a 51 mm inlet diameter Rotrex C30-74 compressor. The compressor blades were instrumented with a polymer/ceramic pressure sensitive paint (PC-PSP).
3：List of Experimental Equipment and Materials:
Equipment included a diode laser (Coherent OBIS 405LX), scanning galvanic mirrors (Thorlabs GVSM002/M), a photo-multiplier tube, and a National Instruments CompactRIO system for control and data acquisition.
4：Experimental Procedures and Operational Workflow:
The laser-scanning system was programmed to scan the surface of the impeller in 401 × 401 points. For each point, the scanning mirrors guided the laser spot to the corresponding coordinate on the compressor impeller, and the system triggered on a blade passage.
5：Data Analysis Methods:
The luminescent intensity decay was analyzed to determine the pressure distribution on the blades. The temperature sensitivity of the paint was corrected using IR camera measurements.
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